Transmission system, transmitting device, receiving device, and remote control method

Abstract

To realize remote control of a transmission device in an optical network that is not affected by an amplifier installed in the middle of an optical transmission path or a transmission distance, and that does not depend on a specific communication protocol.SOLUTION: In a transmission system, a transmission device includes: an optical transmission unit that can adjust a frequency of a main signal; a transmission side control unit that determines a frequency adjustment amount for a reception device to execute control processing; and a frequency control unit that adjusts the frequency of the main signal in the optical transmission unit in accordance with the frequency adjustment amount determined by the transmission side control unit, the reception device includes: an optical reception unit that receives the main signal; a control decision unit that detects the frequency adjustment amount of the main signal received by the optical reception unit; and a reception side control unit that executes the control processing on the basis of the frequency adjustment amount detected by the control decision unit.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a transmission system, a transmission device, a reception device, and a remote control method.

Background Art

[0002] The development of an optical access network that accommodates various terminals and various communication methods has been underway (Non-Patent Document 1). In such an optical access network, a network management control technology that does not depend on a specific protocol is required.

[0003] Patent Document 1 discloses an optical communication system that performs frequency setting of a subscriber device using an AMCC (Auxiliary Management and Control Channel).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] AMCC is a control method that superimposes control signals on a low-frequency band that does not interfere with the main signal, specifically by slowly modulating the amplitude of the optical signal. However, there is a problem in that the use of AMCC is limited when an amplifier is installed in the optical transmission path, or when the transmission distance is large and the signal is affected by noise or reflection. [Means for solving the problem]

[0007] A transmission system according to one aspect of the present disclosure includes a transmitting device that transmits a main signal, and a receiving device connected to the transmitting device via an optical transmission path and receiving the main signal transmitted from the transmitting device, wherein the transmitting device includes an optical transmitting unit connected to the optical transmission path and capable of adjusting the frequency of the main signal to be sent to the optical transmission path, a transmitting-side control unit that determines a frequency adjustment amount for causing the receiving device to perform control processing, and a frequency control unit that adjusts the frequency of the main signal in the optical transmitting unit according to the frequency adjustment amount determined by the transmitting-side control unit, wherein the receiving device includes an optical receiving unit connected to the optical transmission path and receiving the main signal via the optical transmission path, a control determination unit that detects a frequency adjustment amount of the main signal received by the optical receiving unit, and a receiving-side control unit that performs the control processing based on the frequency adjustment amount detected by the control determination unit.

[0008] This disclosure can be implemented not only as a transmission system having the characteristic configuration described above, but also as a transmitting or receiving device included in the transmission system, or as a remote control method that uses characteristic processing in the transmission system as steps. Furthermore, it can be implemented as a computer program used in the transmitting or receiving device, or as a semiconductor integrated circuit for part or all of the transmitting or receiving device. [Effects of the Invention]

[0009] According to this disclosure, it is possible to realize remote control of transmission equipment in an optical network that is less affected by amplifiers installed in the optical transmission path or by the transmission distance, and is independent of a specific communication protocol. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing an example of the configuration of a transmission system according to the first embodiment. [Figure 2] Figure 2 is a block diagram showing an example of the configuration of a transmission device according to the first embodiment. [Figure 3] Figure 3 is a block diagram showing another example of the configuration of the transmission device according to the first embodiment. [Figure 4] Figure 4 shows an example of the configuration of a control table. [Figure 5] Figure 5 is a flowchart showing an example of remote control processing for changing the frequency channel of a transmission device's communication port. [Figure 6] Figure 6 is a flowchart showing an example of remotely controlled processing for changing the frequency channel of a communication port of a transmission device. [Figure 7] Figure 7 is a sequence diagram illustrating an example of remote control for changing the frequency channel of a transmission device's communication port. [Figure 8] Figure 8 is a flowchart showing an example of the alarm transmission process of a transmission device. [Figure 9] Figure 9 is a flowchart showing an example of the alarm reception process of the transmission device 100. [Figure 10] Figure 10 is a sequence diagram illustrating an example of an alarm notification for a communication port malfunction in a transmission device. [Figure 11] Figure 11 is a schematic diagram showing an example of the configuration of a transmission system according to the third embodiment. [Figure 12] Figure 12 is a block diagram showing an example of the configuration of a transmission device 200 according to the third embodiment, connected to multiple client devices. [Figure 13]FIG. 13 is a diagram showing an example of the configuration of the control table according to the third embodiment. [Figure 14] FIG. 14 is a flowchart showing an example of the intermediate control process by the transmission device according to the third embodiment. [Figure 15] FIG. 15 is a sequence diagram for explaining an example of remote control for changing the frequency channel of the communication port of the transmission device. [Figure 16A] FIG. 16A is a flowchart showing an example of a part of the alarm relay process by the transmission device according to the third embodiment. [Figure 16B] FIG. 16B is a flowchart showing an example of another part of the alarm relay process by the transmission device according to the third embodiment. [Figure 17] FIG. 17 is a sequence diagram for explaining an example of alarm notification of an abnormality of the communication port of the transmission device. [Figure 18] FIG. 18 is a schematic diagram showing an example of the configuration of the transmission system according to the fourth embodiment. [Figure 19] FIG. 19 is a block diagram showing an example of the configuration of the transmission device 200 according to the fourth embodiment connected to a plurality of client devices.

MODE FOR CARRYING OUT THE INVENTION

[0011] <SUMMARY OF THE EMBODIMENTS OF THE PRESENT DISCLOSURE> The summary of the embodiments of the present disclosure will be listed and described below.

[0012] (1) The transmission system according to this embodiment includes a transmitting device that transmits a main signal, and a receiving device connected to the transmitting device via an optical transmission path and receiving the main signal transmitted from the transmitting device, wherein the transmitting device includes an optical transmitting unit connected to the optical transmission path and capable of adjusting the frequency of the main signal sent to the optical transmission path, a transmitting-side control unit that determines a frequency adjustment amount to cause the receiving device to perform control processing, and a frequency control unit that adjusts the frequency of the main signal in the optical transmitting unit according to the frequency adjustment amount determined by the transmitting-side control unit, wherein the receiving device includes an optical receiving unit connected to the optical transmission path and receiving the main signal via the optical transmission path, a control determination unit that detects the frequency adjustment amount of the main signal received by the optical receiving unit, and a receiving-side control unit that executes the control processing based on the frequency adjustment amount detected by the control determination unit. By adjusting the frequency of the main signal, remote control of the transmission device in an optical network can be realized that is less susceptible to the influence of amplifiers installed in the middle of the optical transmission path or the transmission distance, and is independent of a specific communication protocol. Note that "frequency of the main signal" means the frequency of the carrier wave of the main signal.

[0013] (2) In (1) above, the transmitting device further includes a transmitting-side storage unit that stores a frequency adjustment amount determined by the transmitting-side control unit, and the frequency control unit may adjust the frequency of the main signal in the optical transmitting unit according to the frequency adjustment amount stored in the transmitting-side storage unit. By writing the frequency adjustment amount to the transmitting-side storage unit, the output frequency of the optical transmitting unit can be controlled and control information can be transmitted to the receiving device.

[0014] (3) In (2) above, the optical transmitting unit and the optical receiving unit are each digital coherent optical transceivers having a fine-tuning function, and the transmitting-side storage unit may be a specific area in a register provided in the digital coherent optical transceiver which is the optical transmitting unit. This makes it possible to transmit control information without depending on a specific protocol by utilizing the fine-tuning function of the digital coherent optical transceiver (hereinafter also referred to as "DCO").

[0015] (4) In any one of (1) to (3) above, the receiving device further includes a receiving-side storage unit that stores a value relating to the changing frequency of the main signal received by the optical receiving unit, and the control determination unit may detect the amount of frequency adjustment of the main signal based on the value relating to the changing frequency stored in the receiving-side storage unit. This makes it possible to detect the amount of frequency adjustment by the value relating to the changing frequency read from the receiving-side storage unit.

[0016] (5) In (4) above, the optical transmitting unit and the optical receiving unit are each digital coherent optical transceivers having a fine-tuning function, and the receiving-side storage unit may be a specific area in a register provided in the digital coherent optical transceiver which is the optical receiving unit. This makes it possible to transmit control information to a receiving device without depending on a specific protocol by utilizing the fine-tuning function of the DCO.

[0017] (6) In any one of (1) to (5) above, the transmitting control unit may determine the frequency adjustment amount corresponding to an element according to the correspondence between the element and the frequency adjustment amount included in the control information for remotely controlling the receiving device, and the control determination unit may determine the element corresponding to the frequency adjustment amount according to the correspondence between the element and the frequency adjustment amount included in the control information. This makes it possible to perform remote control from the transmitting device to the receiving device using a common correspondence between the frequency adjustment amount and elements in both the transmitting device and the receiving device.

[0018] (7) In (6) above, the receiving device may include a plurality of communication ports, and the correspondence may include the correspondence between the plurality of communication ports and the frequency adjustment amount. This makes it possible to specify the communication port in the receiving device by the frequency adjustment amount.

[0019] (8) In (6) or (7) above, the correspondence may include the correspondence between the amount of change in the frequency channel in the receiving device and the amount of frequency adjustment. This makes it possible to instruct the receiving device to change the frequency channel by the amount of frequency adjustment.

[0020] (9) In any one of (6) to (8) above, the correspondence relationship may include a correspondence relationship between the response signal and the frequency adjustment amount. This makes it possible to transmit the response signal to the opposing device based on the frequency adjustment amount.

[0021] (10) In any one of (6) to (9) above, the correspondence may include a correspondence between the type of alarm and the frequency adjustment amount. This allows an alarm to be transmitted to the opposing device based on the frequency adjustment amount.

[0022] (11) In any one of (1) to (10) above, the correspondence may include a correspondence between a code and a frequency adjustment amount. This allows the code to be transmitted to the opposing device by the frequency adjustment amount.

[0023] (12) In any one of (1) to (11) above, the control determination unit may detect the amount of frequency adjustment of the main signal when the frequency of the main signal received by the optical receiving unit changes at predetermined time intervals and then matches multiple times in a row. This makes it possible to detect the amount of frequency adjustment of the main signal with high accuracy when the frequency of the main signal changes gradually over time until it reaches a specified amount of frequency adjustment.

[0024] (13) The transmitting device according to this embodiment is a transmitting device connected to a receiving device via an optical transmission path and transmitting a main signal, comprising: an optical transmitting unit connected to the optical transmission path and capable of adjusting the frequency of the main signal sent to the optical transmission path; a transmitting-side control unit that determines a frequency adjustment amount for the receiving device to perform control processing; and a frequency control unit that adjusts the frequency of the main signal in the optical transmitting unit according to the frequency adjustment amount determined by the transmitting-side control unit. By adjusting the frequency of the main signal, it is possible to realize remote control of a transmission device in an optical network that is less susceptible to the influence of amplifiers installed in the optical transmission path or transmission distance and does not depend on a specific communication protocol.

[0025] (14) The receiving device according to this embodiment is connected to a transmitting device via an optical transmission path and receives a main signal transmitted from the transmitting device, and comprises: an optical receiving unit connected to the optical transmission path and receiving the main signal via the optical transmission path; a control determination unit that detects the amount of frequency adjustment of the main signal received by the optical receiving unit; a control determination unit that determines control information corresponding to the amount of frequency adjustment detected by the detection unit; and a receiving-side control unit that executes control processing based on the amount of frequency adjustment detected by the control determination unit. By adjusting the frequency of the main signal, it is possible to realize remote control of a transmission device in an optical network that is less susceptible to the influence of amplifiers installed in the optical transmission path or the transmission distance, and does not depend on a specific communication protocol.

[0026] (15) A remote control method according to this embodiment is a remote control method for a transmission system including a transmitting device that transmits a main signal and a receiving device connected to the transmitting device via an optical transmission path, wherein the transmitting device remotely controls the receiving device, and the method includes the steps of: the transmitting device determining a frequency adjustment amount of the main signal to cause the receiving device to perform a control process; the transmitting device changing the output frequency of the main signal in an optical transmitting unit connected to the optical transmission path according to the determined frequency adjustment amount; the receiving device detecting the frequency adjustment amount of the main signal received by an optical receiving unit connected to the optical transmission path; and the receiving device performing the control process based on the detected frequency adjustment amount. By adjusting the frequency of the main signal, remote control of a transmission device in an optical network can be realized that is less susceptible to the influence of amplifiers installed in the optical transmission path or the transmission distance, and is independent of a specific communication protocol.

[0027] <Details of the embodiments of this disclosure> The embodiments of this disclosure will be described in detail below with reference to the drawings. At least some of the embodiments described below may be combined in any way.

[0028] [First Embodiment] [1. Transmission System Configuration] Figure 1 is a schematic diagram showing an example of the configuration of a transmission system according to the first embodiment. The transmission system 10 shown in Figure 1 includes transmission devices 100 and 200. Transmission device 100 is connected to the upper network 20 via an optical fiber cable or telecommunications cable, and is connected to transmission device 200 via an optical fiber cable 40. Transmission device 200 is connected to the lower network 21 via an optical fiber cable or telecommunications cable. Transmission devices 100 and 200 relay communication between the upper network 20 and the lower network 21.

[0029] For example, transmission devices 100 and 200 are communication devices that comply with OTN, a communication standard defined by the ITU-T (International Telecommunication Union Telecommunication Standardization Sector).

[0030] For example, the transmission devices 100 and 200 are located at distant locations from each other. The optical fiber cable 40 has a length of, for example, 20 km or more. Dark fiber is used for the optical fiber cable 40, for example.

[0031] The transmission device 100 is connected to the management device 30 via the management network 31. The management device 30 is a device for managing the transmission system 10 and is used, for example, by a network administrator. The management network 31 is, for example, an IP (Internet Protocol) network. The transmission device 100 is connected to the management network 31 by an Ethernet® cable. In Figure 1, the management device 30 is not connected to the transmission device 200, but the management device 30 may be connected to the transmission device 200.

[0032] [2. Configuration of the transmission device] Figures 2 and 3 are block diagrams illustrating the configuration of a transmission device according to the first embodiment. Figure 2 shows an example of the configuration of the transmission device 100.

[0033] Referring to Figure 2, the transmission device 100 includes a processor 110, a memory 120, a communication interface (I / F) 130, and an optical communication I / F 140.

[0034] The processor 110 is, for example, a CPU (Central Processing Unit). However, the processor 110 is not limited to a CPU. The processor 110 may also be a GPU (Graphics Processing Unit). In a specific example, the processor 110 is a multi-core GPU. The processor 110 may also be a single-core processor. The processor 110 is configured to execute computer programs. However, the processor 110 may also be, for example, an ASIC (Application Specific Integrated Circuit), or a programmable logic device such as a gate array or FPGA (Field Programmable Gate Array).

[0035] Memory 120 is a volatile memory such as SRAM (Static Random Access Memory) or DRAM (Dynamic Random Access Memory), or a non-volatile memory such as flash memory, hard disk, or ROM (Read Only Memory). Memory 120 stores a computer program (not shown) for remotely controlling the transmission devices 200, 300A, 300B, 300C, and 300D, and data used to execute the computer program. Each function of the transmission device 100 is performed when the computer program is executed by the processor 110. However, if the processor 110 is an ASIC or a programmable logic device, the processor 110 is configured to perform the same processing as the computer program.

[0036] Memory 120 stores the control table 121. The control table 121 is used for remote control of transmission devices 200, 300A, 300B, 300C, and 300D. Details of the control table 121 will be described later.

[0037] The processor 110 has the functions of a remote control unit 111, a control execution unit 112, an optical input detection unit 113, and a control determination unit 114. Details of the functions of the remote control unit 111, the control execution unit 112, the optical input detection unit 113, and the control determination unit 114 will be described later.

[0038] Communication I / F130 is a communication module capable of optical or telecommunications. Communication I / F130 is connected to the upper network 20 via an optical fiber cable or telecommunications cable.

[0039] The optical communication interface (I / F) 140 is a digital coherent optical transceiver (DCO). The optical communication interface (I / F) 140 is connected to the transmission device (200) via an optical fiber cable (40). A DCO can transmit digital information at speeds of several hundred Gbps by modulating, for example, quadrature amplitude modulation of the optical signal which is the carrier wave. In other words, the optical communication interface (I / F) 140 can transmit a main signal, which is an optical signal modulated from the carrier wave, and can receive a main signal transmitted from the opposing device. The optical communication interface (I / F) 140 can significantly change the frequency of the carrier wave, that is, it can change the frequency channel. The frequency channel represents a multiplexable frequency band. Hereinafter, the center of the frequency band corresponding to a frequency channel will be called the "center frequency". Each frequency channel is assigned a number (channel number). The frequency channel is set in both opposing transmission devices. That is, if the communication interface (I / F) 140 of one transmission device (100) changes the frequency channel, the same frequency channel (a frequency channel with the same channel number as the frequency channel of the opposing device) is set in the communication interface (I / F) 240 of the other transmission device (200).

[0040] The optical communication interface 140 can change (adjust) the carrier frequency by a smaller range than the frequency channel change described above. Specifically, the optical communication interface 140 has a fine-tuning function that can shift the carrier frequency from the center frequency. The optical communication interface 140 can receive the main signal regardless of the amount of frequency adjustment (offset) from the center frequency. The optical communication interface 140 can detect the carrier frequency of the received signal. In the following explanation, to distinguish it from frequency channel changes, the change in carrier frequency by the fine-tuning function will be referred to as frequency "adjustment". Also, in the following, when simply referred to as "main signal frequency", it means the carrier frequency of the main signal.

[0041] In the first embodiment, the optical communication I / F 140 can adjust the frequency of the carrier wave of the main signal to be transmitted in 1 MHz increments. However, the unit of adjustment for the carrier wave frequency is not limited to 1 MHz. The optical communication I / F 140 may be able to adjust the frequency of the carrier wave of the main signal to be transmitted in units smaller than 1 MHz, or it may be able to adjust the frequency of the carrier wave of the main signal to be transmitted in units larger than 1 MHz.

[0042] The optical communication interface 140 includes a control circuit 150 and an optical device 180.

[0043] The optical device 180 includes an optical transmitter 181 and an optical receiver 182, which are composed of photonic integrated circuits. The optical transmitter 181 and the optical receiver 182 constitute a communication port (line port).

[0044] The control circuit 150 includes a register 151 and a processor 152.

[0045] The processor 152 is comprised of, for example, an ASIC or a programmable logic device. The processor 152 may also be a CPU capable of executing software.

[0046] The processor 152 has the functions of a frequency control unit 153 and an optical input state acquisition unit 154.

[0047] The control circuit 150 includes a transmit frame control unit 160 and a receive frame control unit 170. The transmit frame control unit 160 is connected to the optical communication I / F 130 and performs predetermined frame processing on signals received from the upper network 20. For example, the transmit frame control unit 160 generates an OTN frame. The transmit frame control unit 160 is connected to the optical transmitter 181 and outputs the generated OTN frame to the optical transmitter 181. The optical transmitter 181 sends out the OTN frame received from the transmit frame control unit 160 as an optical signal (main signal).

[0048] The receiving frame control unit 170 is connected to the optical receiver 182 and receives OTN frames received by the optical receiver 182. The receiving frame control unit 170 is connected to the optical communication interface 130 and outputs a signal to the optical communication interface 130 that has undergone predetermined processing on the OTN frame, for example. The optical communication interface 130 sends the input signal to the upper network 20.

[0049] The transmission frame control unit 160 and the reception frame control unit 170 are configured, for example, by large-scale integrated circuits (LSIs).

[0050] The transmission device 100 further includes a management communication interface 190. The management communication interface 190 is connected to the management device 30 via a management network 31.

[0051] Figure 3 shows an example of the configuration of the transmission device 200. The configuration of the transmission device 200 will be explained with reference to Figure 3.

[0052] The transmission device 200 includes a processor 210, a memory 220, a communication interface 230, an optical communication interface 240, and a management communication interface 290.

[0053] The configuration of the processor 210 and memory 220 is the same as that of the processor 110 and memory 120 described above, so the explanation is omitted.

[0054] Memory 220 stores the control table 221. Control table 221 is the same table as the control table 121 mentioned above.

[0055] The processor 210 has the functions of a remote control unit 211, a control execution unit 212, an optical input detection unit 213, and a control determination unit 214.

[0056] Communication I / F230 is a communication module capable of optical or telecommunications. Communication I / F230 is connected to the lower network 21 via an optical fiber cable or a telecommunications cable.

[0057] The Optical Communication I / F240 is a digital coherent optical transceiver. The configuration of the Optical Communication I / F240 is the same as that of the Optical Communication I / F140.

[0058] The optical communication interface 240 has a fine-tuning function. The optical communication interface 240 can adjust the frequency of the carrier wave optical signal and can receive optical signals within the range of frequency adjustment by the fine-tuning function. The configuration of the optical communication interface 240 is the same as that of the optical communication interface 140 described above, so the explanation is omitted. In the following, the components of the optical communication interface 240 that correspond to the components of the optical communication interface 140 are assigned a code in which the first digit of the code assigned to the components of the optical communication interface 140 is changed from "1" to "2".

[0059] [3. Functions of the transmission device] As described above, the transmission device 100 has the functions of a remote control unit 111, a control execution unit 112, an optical input detection unit 113, a control determination unit 114, a frequency control unit 153, and an optical input state acquisition unit 154. The transmission device 200 has the functions of a remote control unit 211, a control execution unit 212, an optical input detection unit 213, a control determination unit 214, a frequency control unit 253, and an optical input state acquisition unit 254. The remote control unit 211, control execution unit 212, optical input detection unit 213, control determination unit 214, frequency control unit 253, and optical input state acquisition unit 254 of the transmission device 200 have the same functions as the remote control unit 111, control execution unit 112, optical input detection unit 113, control determination unit 114, frequency control unit 153, and optical input state acquisition unit 154 of the transmission device 100.

[0060] The transmission devices 100 and 200 can function as either "transmitters" or "receivers." When transmission device 100 remotely controls transmission device 200, transmission device 100 functions as a "transmitter" and transmission device 200 functions as a "receiver." When transmission device 200 remotely controls transmission device 100, transmission device 200 functions as a "transmitter" and transmission device 100 functions as a "receiver."

[0061] The management device 30 can, for example, transmit control information input by a user for remotely controlling the transmission device 200. For example, if the transmission device 100 functions as a "transmitter" and the transmission device 200 functions as a "receiver," the control information transmitted from the management device 30 is input to the processor 110 via the management communication I / F 190 of the transmission device 100. The remote control unit 111 acquires the control information.

[0062] The remote control units 111 and 211 may generate control information. The remote control unit 211 can generate control information to notify the status of the transmission device 200. For example, if an abnormality is detected in the transmission device 200, the remote control unit 211 generates control information to notify the abnormality detection. When the transmission device 200 functions as a "transmitter" and the transmission device 100 functions as a "receiver", the remote control unit 211 generates control information. When the transmission device 100 functions as a "transmitter" and the transmission device 200 functions as a "receiver", the remote control unit 111 generates control information. Here, alarm notifications can be sent from the transmission device 200 to the transmission device 100, but alarm notifications are not sent from the transmission device 100 to the transmission device 200.

[0063] The control information generated by the remote control units 111 and 211 may be composed of a combination of multiple elements. For example, the control information "Alarm a temperature anomaly in communication port 1" is composed of the control target "communication port 1" and the control content "Alarm: Temperature Anomaly". The control information "Alarm a temperature anomaly in communication port 1" can be decomposed into the control target element "Communication port specification (port 1)" and the control content element "Alarm: Temperature Anomaly". Hereinafter, the elements that constitute the control information will also be referred to as "transmission elements".

[0064] Control information may consist of a single element. In this embodiment, the management device 30 can output a change in the frequency channel of the line port of the transmission device 200 as control information. In this case, the management device 30 outputs control information that means "change the frequency channel by +10". In the transmission device 200, only line ports are subject to frequency channel changes, so the element specifying the line port is omitted from the control information. That is, the above control information does not include the element "line port specification" that is the target of control, but only includes the element "frequency channel change (+10)" that is the target of control.

[0065] The remote control unit 111 determines the frequency adjustment amount (Δf) of the carrier wave of the main signal based on the acquired control information. The frequency adjustment amount is the offset from the center frequency of the main signal.

[0066] In a specific example, the remote control unit 111 determines the frequency adjustment amount corresponding to the control information according to the control table 121 for determining the frequency adjustment amount.

[0067] The remote control units 111 and 211 determine the transmission elements from the acquired control information. If the control information consists of multiple transmission elements, the remote control units 111 and 211 decompose the control information into multiple transmission elements. When the control information is decomposed into multiple transmission elements, the transmission elements are transmitted sequentially between the transmission devices 100 and 200. In a specific example, the controlled object is transmitted first, followed by the control content. The receiving device selects the received controlled object and executes processing on the selected controlled object according to the control content.

[0068] If the control information consists of only one transmission element, the remote control units 111 and 211 determine the control information to be the transmission element. The transmission element is transmitted between the transmission devices 100 and 200. The receiving device performs processing according to the received transmission element.

[0069] Each transmission element is associated with a frequency adjustment amount. Specifically, control tables 121 and 221 define the correspondence between transmission elements and frequency adjustment amounts. Remote control units 111 and 211 refer to control tables 121 and 221 to determine the frequency adjustment amount corresponding to the transmission element.

[0070] Figure 4 shows an example of the configuration of the control table 121.

[0071] From the perspective of transmission device 100, the object of remote control is transmission device 200. From the perspective of transmission device 200, the object of remote control is transmission device 100. Here, we will explain using the case of remotely controlling transmission device 200 from transmission device 100 as an example.

[0072] In the example in Figure 4, the control table 121 defines the correspondence between communication ports and frequency adjustment amounts. "Line port specification" is a transmission element for specifying the line port of the transmission device 200 that is the target of control, i.e., the communication port connected to the optical fiber cable 40. The transmission element "line port specification" corresponds to the frequency adjustment amount "-0001". "-0001" means to decrease the frequency of the main signal by 1 MHz from the center frequency. In the following explanation, decreasing the frequency of the main signal by x MHz from the center frequency is represented as "-000x", and increasing the frequency of the main signal by x MHz from the center frequency is represented as "+000x".

[0073] The transmission element "communication port specification" is control information for specifying the communication port of the transmission device 200 that is the target of control, that is, the communication port provided by the communication I / F 280. The transmission element "communication port specification" is assigned a frequency adjustment amount from "+0001" to "+0049".

[0074] Each communication port on the communication interface 280 is assigned a port number. For example, if the communication interface 280 has 10 communication ports, port numbers 1 through 10 are assigned to each communication port. Hereafter, a communication port assigned port number N will be referred to as "port N". The transmission element that specifies port 1 corresponds to the frequency adjustment amount "+0001". The transmission element that specifies port 2 corresponds to the frequency adjustment amount "+0002". The transmission element that specifies port 3 corresponds to the frequency adjustment amount "+0003". In other words, in one example, a port number corresponds to a frequency adjustment amount with the same value as the port number.

[0075] The control table 121 also defines the correspondence between the control content, the transmission element "frequency channel change," and the frequency adjustment amount. "Frequency channel change" is a transmission element for changing the frequency channel at the line port of the transmission device 200, that is, a transmission element for changing the center frequency of the carrier wave of the signal transmitted from the line port. The transmission element "frequency channel change" is assigned frequency adjustment amounts from "-0049" to "-0001" and from "+0001" to "+0049."

[0076] For example, the frequency adjustment amount for decreasing the channel number of a frequency channel by 5 is "-0005", and the frequency adjustment amount for increasing the channel number of a frequency channel by 10 is "+0010". In other words, in one example, the transmission element "frequency channel change" corresponds to a frequency adjustment amount that is the same value as the change in the channel number of the frequency channel.

[0077] The control table 121 defines the correspondence between the transmission element "response signal" (ACK) and the frequency adjustment amount. For example, when the transmission element is received from the transmission device 100 due to frequency adjustment of the main signal, the transmission device 200 replies with an ACK. The transmission element "ACK" corresponds to the frequency adjustment amounts "-0050" and "+0050". "ACK" is a transmission element used alone.

[0078] The transmission element "ACK" is associated with two frequency adjustment values, "-0050" and "+0050," in order to alternate between "-0050" and "+0050" as frequency adjustment values ​​used for ACK. In other words, for example, if transmission device 200 increases the frequency of the main signal by 50 MHz from the center frequency to send an "ACK," then decreases the frequency of the main signal by 50 MHz from the center frequency when sending another "ACK." This allows transmission device 100 to distinguish between two ACKs when ACKs are sent consecutively from a single transmission device 200. If ACKs of the same polarity (for example, "+0050" and "+0050") are received consecutively, transmission device 100 can recognize that an anomaly has occurred.

[0079] The control table 121 defines the correspondence between the type of alarm as a transmission element and the frequency adjustment amount. For example, the transmission element "Alarm: Temperature Anomaly" corresponds to the frequency adjustment amount "+0051". For example, the transmission element "Alarm: Input Voltage Anomaly" corresponds to the frequency adjustment amount "+0052". For example, the transmission element "Alarm: Bit Error Occurred" corresponds to the frequency adjustment amount "+0053". For example, the transmission element "Alarm: Remote Fault" corresponds to the frequency adjustment amount "+0054". For example, the transmission element "Alarm: Local Fault" corresponds to the frequency adjustment amount "+0055". For example, the transmission element "Alarm: Firmware Update Anomaly" corresponds to the frequency adjustment amount "+0056". For example, the transmission element "Alarm: Optical Input Disconnection" corresponds to the frequency adjustment amount "+0059". For example, the transmission element "Alarm: Optical Link Port Disconnected" corresponds to the frequency adjustment amount "+0060".

[0080] The alarm transmission element, in combination with the transmission element for the target of the alarm, constitutes control information. In this embodiment, the communication I / F230 is provided with one communication port, and the port number of this communication port is "1". For example, if a temperature anomaly occurs on port 1, control information is generated consisting of the transmission element "Communication port specification (port number 1)" and the transmission element "Alarm: Temperature anomaly". If there is only one target for the alarm, the control information may be composed only of the alarm transmission element. For example, it is not necessary to specify the target for a firmware update anomaly. Therefore, the control information consists only of the transmission element "Alarm: Firmware update anomaly".

[0081] Control table 121 defines the correspondence between "interrupt" as a transmission element and frequency adjustment amounts. "Interrupt" is a transmission element used to instruct the opposing device to temporarily interrupt an ongoing remote control sequence and forcibly start a new sequence. The transmission element "interrupt" corresponds to frequency adjustment amounts "+0100" and "-0100". "Interrupt" is a transmission element used alone. The reason why two frequency adjustment amounts "+0100" and "-0100" are associated with the transmission "interrupt" is to alternate between "-0100" and "+0100" as frequency adjustment amounts used as interrupts.

[0082] For example, if the transmission device 200 detects an anomaly and notifies the transmission device 100 of an alarm, and then recovers from the anomaly, it notifies the transmission device 100 that the alarm has been cleared. The transmission element "alarm cleared" corresponds to returning the frequency of the modified main signal to the center frequency, that is, setting the frequency adjustment amount Δf to 0.

[0083] Referring to Figure 2, the remote control unit 111 outputs the acquired frequency adjustment amount to the control execution unit 112. The control execution unit 112 writes the input frequency adjustment amount to a specific address in register 151. Register 151 includes a frequency adjustment amount specification area 151A, which is an area for fine tuning. For example, if the optical communication I / F 140 is an optical communication module compliant with the OpenZR+ Multi-Source Agreement, the frequency adjustment amount specification area 151A is a 2-byte area corresponding to one frequency channel. The frequency adjustment amount specification area 151A may be provided for each communication port or for each frequency channel, for example. The frequency adjustment amount specification area 151A is an example of a "transmitter-side storage unit".

[0084] The register 251 of the transmission device 200 has the same configuration as the register 151. Therefore, the register 251 includes a frequency adjustment amount specification region 251A (Figure 3).

[0085] The frequency control unit 153 adjusts the output frequency of the main signal in the optical transmitter 181 according to the frequency adjustment amount determined by the remote control unit 111. Specifically, the frequency control unit 153 reads the frequency adjustment amount from the frequency adjustment amount specification area 151A of the register 151 and changes the output frequency of the main signal in the optical transmitter 181 from the center frequency by the read frequency adjustment amount.

[0086] The optical input status acquisition unit 154 monitors the optical input status in the optical receiver 182. The optical input status acquisition unit 154 writes the acquired optical input status information to a specific address in register 151. Register 151 includes an optical input status area 151B, which is an area for storing optical input status information. The optical input status area 151B is provided, for example, for each communication port. Specifically, if there is no optical input, the optical input status acquisition unit 154 writes optical input status information indicating "no optical input" to the optical input status area 151B. If there is an optical input, the optical input status acquisition unit 154 writes optical input status information indicating "optical input present" to the optical input status area 151B.

[0087] Similarly, the register 251 of the transmission device 200 also includes an optical input state region 251B (Figure 3).

[0088] The optical input detection unit 113 reads optical input state information from the optical input state area 151B of the register 151. The optical input detection unit 113 detects (determines) the optical input state in the optical receiver 182 based on the read optical input state information. The optical input detection unit 113 outputs the optical input state in the optical receiver 182 to the remote control unit 111.

[0089] The remote control unit 111 determines whether or not to perform remote control depending on the optical input status. If there is optical input, the remote control unit 111 performs remote control of the transmission device 200. That is, the remote control unit 111 outputs the frequency adjustment amount to the control execution unit 112 as described above. If there is no optical input, the remote control unit 111 stops remote control of the transmission device 200. That is, the remote control unit 111 does not output the frequency adjustment amount to the control execution unit 112 as described above.

[0090] The optical receiver 282 receives the main signal by tuning to the optical signal corresponding to the set frequency channel. When the output frequency of the main signal is adjusted in the opposing device, the optical receiver 282 receives the main signal at the adjusted frequency. The optical input state acquisition unit 254 detects the difference between the frequency of the received main signal and the center frequency, that is, the amount of frequency change.

[0091] The optical input state acquisition unit 254 writes the detected frequency change amount of the main signal to a specific address in register 251. Register 251 includes a detection value area 251C, which is an area for storing the detected value of the frequency change amount. For example, if the optical communication I / F 240 is an optical communication module compliant with the OpenZR+ Multi-Source Agreement, the detection value area 251C is a 2-byte area corresponding to one frequency channel. The detection value area 251C may be provided for each communication port or for each frequency channel, for example. The detection value area 251C is an example of a "receiving side storage unit".

[0092] Similarly, the register 151 of the transmission device 100 also includes a detected value area 151C (Figure 2).

[0093] The control determination unit 214 detects the amount of frequency adjustment of the main signal received by the optical receiver 282. In one example, the control determination unit 214 detects the amount of frequency adjustment of the main signal based on the value of the frequency change written in the detection value area 251C. Specifically, the optical input state acquisition unit 254 writes the detected value of the change in the frequency of the main signal received by the optical receiver 282 from the center frequency at predetermined time intervals (sampling period) to the detection value area 251C. The control determination unit 214 refers to the detection value area 251C and determines that frequency adjustment is complete when the detected value of the frequency change changes and then matches multiple times consecutively. For example, the frequency of the main signal gradually changes over time until it reaches the target frequency (adjusted frequency). The control determination unit 214 monitors the amount of frequency change of the main signal in the optical receiver 282 at each sampling period. During the change in the frequency of the main signal, the amount of frequency change of the main signal observed multiple times by the control determination unit 214 will not match. When the frequency of the main signal reaches the target frequency (i.e., when the frequency adjustment of the main signal is complete), the change in the amount of frequency change of the main signal stops. Therefore, the amount of frequency change of the main signal observed multiple times by the control determination unit 214 will be the same. The control determination unit 214 detects the amount of frequency change at the time the frequency adjustment is complete as the amount of frequency adjustment of the main signal. As described above, by determining that the frequency adjustment of the main signal is complete when the amount of frequency change of the main signal is the same multiple times in a row, the amount of frequency adjustment can be accurately detected.

[0094] The control determination unit 214 determines the transfer element corresponding to the detected frequency adjustment amount. Specifically, the control determination unit 214 determines the transfer element corresponding to the frequency adjustment amount according to the control table 221.

[0095] The control determination unit 214 outputs the transmission element identified by the control table 221 to the remote control unit 211. The remote control unit 211 executes control processing according to the transmission element output from the control determination unit 214. For example, if the transmission element "frequency channel change" is received, the remote control unit 211 instructs the control execution unit 212 to change the frequency channel by the specified amount. The control execution unit 212 changes the frequency channel of the line port by the specified amount according to the instruction.

[0096] When the transmission device 100 functions as a "transmitter," the optical transmitter 181 corresponds to the "optical transmitting unit," the remote control unit 111 corresponds to the "transmitter-side control unit," the frequency adjustment amount specification area 151A corresponds to the "transmitter-side storage unit," and the control table 121 corresponds to the "transmitter-side control table." When the transmission device 200 functions as a "receiver," the optical receiver 282 corresponds to the "optical receiving unit," the remote control unit 211 corresponds to the "receiver-side control unit," the detected value area 251C corresponds to the "receiver-side storage unit," and the control table 221 corresponds to the "receiver-side control table." When the transmission device 200 functions as a "transmitter," the optical transmitter 281 corresponds to the "optical transmitting unit," the remote control unit 211 corresponds to the "transmitter-side control unit," the frequency adjustment amount specification area 251A corresponds to the "transmitter-side storage unit," and the control table 221 corresponds to the "transmitter-side control table." When the transmission device 100 functions as a "receiving device", the optical receiver 182 corresponds to the "optical receiving unit", the remote control unit 111 corresponds to the "receiving side control unit", the detected value area 151C corresponds to the "receiving side storage unit", and the control table 121 corresponds to the "receiving side control table".

[0097] [4. Operation of the transmission system] The transmission device 100, which is a remote control device, performs remote control processing. Remote control processing is the process of remotely controlling the transmission device 200, which is the controlled device. Figure 5 is a flowchart showing an example of remote control processing for changing the frequency channel of the communication port of the transmission device 200.

[0098] The processor 110 determines whether or not control information has been acquired (step S101). The user inputs the amount of frequency channel change at the line port of the transmission device 200 to the management device 30. The management device 30 transmits control information corresponding to the user's input to the transmission device 100. The control information includes, for example, the amount of frequency channel change, which is the control content.

[0099] If the processor 110 has not acquired control information (NO in step S101), it repeats step S101. If the processor 110 has acquired control information (YES in step S101), it determines the transmission element from the acquired control information (step S102).

[0100] When the main signal is input to the optical receiver 182, the optical input status area 151B of register 151 stores optical input status information indicating that there is an optical input. When the main signal is not input to the optical receiver 182, the optical input status area 151B of register 151 stores optical input status information indicating that there is no optical input. The processor 110 reads the value of the optical input status area 151B of register 151.

[0101] The processor 110 determines whether or not there is an optical input based on the optical input status information (step S103). If there is no optical input (NO in step S103), the processor 110 notifies the user that there is no optical input from the remotely controlled object and terminates the remote control process.

[0102] If there is an optical input (YES in step S103), the control table 121 is referenced and the frequency adjustment amount corresponding to the transmission element obtained from the control information is determined (step S104).

[0103] The processor 110 writes the determined frequency adjustment amount to the frequency adjustment amount specification area 151A of the register 151 (step S105). The processor 152 of the optical communication I / F 140 reads the frequency adjustment amount from the frequency adjustment amount specification area 151A of the register 151 and changes the output frequency of the main signal at the optical transmitter 181 from the center frequency by the specified frequency adjustment amount.

[0104] When the transmission element is sent to the transmission device 200 due to frequency adjustment of the main signal, the transmission device 200 replies with an ACK. The processor 110 receives the ACK from the transmission device 200 (step S106). Specifically, the processor 152 of the optical communication I / F 140 detects the amount of change from the center frequency of the reception frequency of the main signal at the optical receiver 182 at each sampling period, and writes the value of the detected frequency change to the detected value area 151C of the register 151. The processor 110 monitors the frequency change in the detected value area 151C. If the value of the frequency change changes and then matches multiple times consecutively, the processor 110 takes the frequency change at that point as the frequency adjustment amount. The processor 110 refers to the control table 121 and determines the transmission element (ACK) corresponding to the detected frequency adjustment amount.

[0105] In response to a change in the frequency channel of the line port in the transmission device 200, the frequency channel of the line port in the transmission device 100 also needs to be changed. For example, if the control information is "change the frequency channel of the line port by +20", then not only the transmission device 200 but also the transmission device 100 needs to increase the channel number of the line port frequency channel by 20. The processor 110 performs the process of changing the frequency channel of the line port by the amount specified in the control information (step S107). This completes the remote control process.

[0106] The transmission device 200, which is the device to be remotely controlled, performs remote control processing. Remote control processing is the process by which the transmission device 200, which is the device to be remotely controlled, is remotely controlled. Figure 6 is a flowchart showing an example of remote control processing for changing the frequency channel of the communication port of the transmission device.

[0107] The processor 210 reads the value of the optical input state area 251B of register 251 and determines whether or not there is an optical input based on the optical input state information (step S201). If there is no optical input (NO in step S201), the processor 210 executes step S201 again.

[0108] If there is an optical input (YES in step S201), the processor 252 of the optical communication I / F 240 detects the change in the reception frequency of the main signal at the optical receiver 282 from the center frequency at each sampling period, and writes the detected value of the frequency change to the detected value area 251C of the register 251. The processor 210 detects the frequency adjustment amount by monitoring the value of the frequency change amount in the detected value area 251C (step S202). The specific frequency adjustment amount detection process is the same as in step S106 described above.

[0109] The processor 210 refers to the control table 221 and determines the transfer element corresponding to the detected frequency adjustment amount (step S203).

[0110] The processor 210 sends an ACK to the transmission device 100 (step S204). Specifically, the processor 210 refers to the control table 221 and determines the frequency adjustment amount corresponding to the transmission element "ACK". The processor 210 writes the determined frequency adjustment amount to the frequency adjustment amount specification area 251A of the register 251. The processor 252 of the optical communication I / F 1240 reads the frequency adjustment amount from the frequency adjustment amount specification area 251A of the register 251 and adjusts the output frequency of the main signal at the optical transmitter 281 from the center frequency by the specified frequency adjustment amount. As a result, the ACK is transmitted.

[0111] The transmission element received from the transmission device 100 is a transmission element that specifies the amount of change in the frequency channel of the line port. The processor 210 changes the frequency channel of the line port by the specified amount (step S205). That is, the processor 210 executes the control process instructed by the control information. After step S205, the processor 210 returns to step S201.

[0112] Figure 7 is a sequence diagram illustrating an example of remote control for changing the frequency channel of a line port of the transmission device 200.

[0113] When the processor 110 of the transmission device 100 receives the control information "Change frequency channel by +5" from the management device 30, it recognizes the transmission element "Change frequency channel (+5)" from the control information.

[0114] The processor 110 refers to the control table 121 and determines the frequency adjustment amount "+0005" corresponding to the transmission element "frequency channel change (+5)". The processor 110 writes the frequency adjustment amount "+0005" to the frequency adjustment amount specification area 151A of the register 151. As a result, the output frequency of the main signal in the optical transmitter 181 increases by 5 MHz from the center frequency (step S1).

[0115] The processor 252 of the transmission device 200 detects the change in the received frequency from the center frequency at the optical receiver 282 at each sampling period and writes the detected frequency change value to the detected value area 251C of the register 251. The processor 210 repeatedly reads the frequency change value from the detected value area 251C of the register 251 and detects the convergence of the change in the received frequency change value. The processor 210 detects the value of the frequency change at the point when the change has converged as the frequency adjustment amount.

[0116] The processor 210 refers to the control table 221 and determines the transmission element "frequency channel change (+5)" corresponding to the detected frequency adjustment amount "+0005". This allows the processor 210 to recognize that the control action involves increasing the frequency channel (or its channel number) by 5.

[0117] The processor 210 refers to the control table 221 and determines the frequency adjustment amount "+0050" corresponding to the transmission element "ACK". The processor 210 writes the frequency adjustment amount "+0050" to the frequency adjustment amount specification area 251A of the register 251. As a result, the output frequency of the optical transmitter 281 increases by 50 MHz from the center frequency of the main signal (step S2).

[0118] The processor 152 of the transmission device 100 detects the change in the received frequency from the center frequency at the optical receiver 182 at each sampling period and writes the detected frequency change value to the detected value area 151C of the register 151. The processor 110 repeatedly reads the frequency change value from the detected value area 151C of the register 151 and detects the frequency adjustment amount in the same manner as described above.

[0119] The processor 110 refers to the control table 121 and determines the transmission element "ACK" corresponding to the detected frequency adjustment amount "+0050".

[0120] Transmission devices 100 and 200 perform control processing to increase the channel number of the line port frequency channel by 5 (steps S3 and S4). Once the frequency channel change is complete, transmission devices 100 and 200 become ready to communicate (link up) (step S5).

[0121] If an abnormality occurs in the transmission device 200, the transmission device 200 will notify the transmission device 100, which is connected to the management device 30, of an alarm. However, since the management device 30 is not connected to the transmission device 200, if an abnormality occurs in the transmission device 100, the transmission device 100 will not notify the transmission device 200 of an alarm, but will notify the management device 30 of an alarm. The alarm transmission process for notifying the transmission device 100 from the transmission device 200 will be described below.

[0122] Figure 8 is a flowchart showing an example of the alarm transmission process of the transmission device 200.

[0123] If an abnormality occurs in the line port or communication port of the transmission device 200, the processor 210 detects the abnormality based on the output from a sensor provided in the line port or communication port (step S221).

[0124] The processor 210 of the transmission device 200 checks the optical input status at the optical receiver 282. The optical input status check operation (step S222) is the same as the optical input status check operation (step S103) in the transmission device 100, so the explanation is omitted.

[0125] If there is no optical input (NO in step S222), the processor 210 terminates the alarm transmission process. If there is an optical input (YES in step S222), the processor 210 transmits the transmission element "interrupt" to the transmission device 100 (step S223). In other words, the processor 210 changes the output frequency of the main signal from the center frequency by the frequency adjustment amount corresponding to the transmission element "interrupt".

[0126] When the transmission element is transmitted to the transmission device 100 by adjusting the frequency of the main signal, the transmission device 100 replies with an ACK. The processor 210 receives the ACK from the transmission device 100 (step S224). The ACK reception operation in the transmission device 200 is the same as the ACK reception operation in the remote control processing of the transmission device 100 (step S106), so the explanation is omitted.

[0127] The processor 210 determines a transmission element that specifies the line port or communication port where an abnormality was detected, and a transmission element for an alarm (step S225). For example, if a temperature abnormality is detected in a line port, in step S225, the transmission elements "line port specification" and "alarm: temperature abnormality" are determined. In the case of an alarm that does not require specifying a control target (for example, alarm: firmware update abnormality), the transmission element that specifies the line port or communication port is omitted. In step S225, if multiple transmission elements are determined, the order in which the transmission elements are transmitted is also determined.

[0128] The processor 210 selects one of the obtained transmission elements to be transmitted according to the determined transmission order (step S226). However, if there is only one transmission element, that transmission element is selected. The processor 210 transmits each determined transmission element to the transmission device 100 by shifting the output frequency of the main signal in the optical transmitter 281 from the center frequency. The transmission operation of the transmission elements (steps S227 to S228) is the same as the transmission operation of the transmission elements in the remote control processing of the transmission device 100 (steps S105 to S106), so the explanation is omitted.

[0129] When the transmission device 100 receives a transmission element, it sends back an ACK. The processor 210 receives the ACK from the transmission device 200 (step S229). If the transmission device 100 receives multiple transmission elements, it changes the polarity of the ACK for each transmission element. That is, for example, when it receives the first transmission element, it increases the frequency of the main signal by 50 MHz from the center frequency (frequency adjustment amount "+0050"), and when it receives the second transmission element, it decreases the frequency of the main signal by 50 MHz from the center frequency (frequency adjustment amount "-0050"). In receiving the ACK in step S229, the processor 210 checks the alternation of the polarity of the frequency adjustment amount. This allows the processor 210 to confirm that the opposing device has received multiple transmission elements.

[0130] Next, the processor 210 determines whether all transmission elements have been transmitted (step S230). If there are any transmission elements that have not been transmitted (NO in step S230), the process returns to step S226 and selects the remaining transmission elements to be transmitted. As a result, the transmission element specifying the line port or communication port where the abnormality was detected, and the alarm transmission element are sent to the transmission device 100.

[0131] If all transmission elements have been transmitted (YES in step S230), the processor 210 determines whether or not the abnormal state has been recovered (step S231). If the abnormal state has not been recovered (NO in step S231), the processor 210 repeats step S231.

[0132] If the system has recovered from an abnormal state (YES in step S231), the processor 210 transmits the transmission element "alarm cleared" to the transmission device 100 (step S232). In other words, the processor 210 changes the output frequency of the main signal from the center frequency by the frequency adjustment amount corresponding to the transmission element "alarm cleared". When the transmission device 100 receives the transmission element "alarm cleared", it replies with an ACK. The processor 210 receives the ACK from the transmission device 200 (step S233). In step S233, the processor 210 also checks the polarity alternation of the ACK. This completes the alarm transmission process.

[0133] The transmission device 100, which is the receiver of the alarm, performs an alarm reception process. The alarm reception process is the process for receiving the alarm transmitted from the transmission device 200. Figure 9 is a flowchart showing an example of the alarm reception process of the transmission device 100.

[0134] The processor 110 of the transmission device 100 checks the optical input status at the optical receiver 182 (step S121). If there is no optical input (NO in step S121), the processor 210 repeats step S121.

[0135] If there is an optical input (YES in step S121), the transmission device 100 receives the transmission element "interrupt" transmitted from the transmission device 200 (step S122). In other words, the processor 210 detects the frequency adjustment amount by monitoring the frequency change amount in the detected value region 251C and determines the transmission element corresponding to the detected frequency adjustment amount. If the processor 110 receives the transmission element "interrupt" while executing remote control processing, for example, it interrupts the remote control processing.

[0136] When the transmission device 100 receives the transmission element "interrupt", the processor 110 sends an ACK to the transmission device 200 (step S123). In other words, the processor 110 refers to the control table 121 and determines the frequency adjustment amount corresponding to the transmission element "ACK". The processor 110 writes the determined frequency adjustment amount to the frequency adjustment amount specification area 151A of the register 151.

[0137] After transmitting the transmission element "ACK", the processor 110 receives transmission elements related to the alarm (a transmission element that specifies the line port or communication port where the abnormality was detected, and an alarm transmission element). In other words, the processor 110 detects the frequency adjustment amount by monitoring the frequency change amount in the detected value area 151C (step S124), and determines the transmission element corresponding to the detected frequency adjustment amount (step S125).

[0138] When the transmission device 100 receives a transmission element sent from the transmission device 200, the processor 110 sends an ACK to the transmission device 200 (step S126). When multiple transmission elements are received consecutively, the transmission device 100 alternates the polarity of the ACK as described above.

[0139] The processor 110 determines whether the transmission element received from the transmission device 200 is a transmission element that specifies the line port or communication port where an abnormality was detected, or a transmission element that indicates the type of abnormality (step S127). If it is a transmission element that specifies the line port or communication port ("port specification" in step S127), the processor 110 recognizes the port (line port or communication port) where an abnormality was detected from the transmission element (step S128). In this case, the processor 110 returns to step S124 and receives the alarm transmission element.

[0140] If the transmission element received from the transmission device 200 is an alarm transmission element (in step S127, "alarm"), the processor 110 transmits alarm information, including the line port or communication port recognized as the location of the abnormality and the type of abnormality, to the management device 30 (step S129).

[0141] The processor 110 determines whether or not it has received an alarm cancellation from the transmission device 200 (step S130). If it has not received an alarm cancellation (NO in step S130), the processor 110 executes step S130 again.

[0142] If an alarm cancellation is received (YES in step S130), the processor 110 sends an ACK to the transmission device 200 (step S131). In step S131, the processor 110 alternates the polarity of the ACK. The processor 110 notifies the management device 30 that the alarm has been cancelled (step S132) and returns to step S121.

[0143] Figure 10 is a sequence diagram illustrating an example of an alarm notification for an abnormality in the communication port of the transmission device 200. Figure 10 shows an example of notifying of a temperature abnormality in communication port 1 of the communication I / F 230.

[0144] When the processor 210 of the transmission device 200 detects a temperature anomaly in the communication port 1 of the communication I / F 230, it refers to the control table 221 and determines a frequency adjustment amount "-0100" corresponding to the transmission element "interrupt". The processor 210 writes the frequency adjustment amount "-0100" to the frequency adjustment amount specification area 251A of the register 251. As a result, the output frequency of the main signal in the optical transmitter 281 decreases by 100 MHz from the center frequency (step S11).

[0145] The processor 110 of the transmission device 100 monitors the detected value area 151C of the register 151 and detects the frequency adjustment amount of the received main signal. The processor 110 refers to the control table 121 and determines the transmission element "interrupt" corresponding to the detected frequency adjustment amount "-0100". As a result, the processor 210 recognizes that an interrupt has been notified and, if it is performing remote control processing, interrupts the remote control processing.

[0146] The processor 110 transmits the transmission element "ACK", and the transmission device 200 receives the ACK (step S12). The transmission and reception of the ACK is the same as in step S2 described above.

[0147] The processor 210 determines the transmission element "communication port specification (port number 1)" and the transmission element "alarm: temperature abnormality".

[0148] The processor 210 determines a frequency adjustment amount "+0001" corresponding to the transmission element "communication port specification (port number 1)" and writes a frequency adjustment amount "-0001" to the frequency adjustment amount specification area 251A of register 251. As a result, the output frequency of the main signal in the optical transmitter 281 decreases by 1 MHz from the center frequency (step S13).

[0149] The processor 110 of the transmission device 100 detects the amount of frequency adjustment of the main signal and recognizes the transmission element "communication port designation (port number 1)" corresponding to the detected amount of frequency adjustment.

[0150] The processor 110 sends an ACK, and the transmission device 200 receives the ACK (step S14).

[0151] The processor 210 determines a frequency adjustment amount "+0051" corresponding to the transmission element "Alarm: Temperature Anomaly" and writes the frequency adjustment amount "+0051" to the frequency adjustment amount specification area 251A of the register 251. As a result, the output frequency of the main signal in the optical transmitter 281 increases by 51 MHz from the center frequency (step S15).

[0152] The processor 110 of the transmission device 100 detects the amount of frequency adjustment of the main signal and recognizes the transmission element "Alarm: Temperature Anomaly" corresponding to the detected amount of frequency adjustment.

[0153] The processor 110 sends an ACK, and the transmission device 200 receives the ACK (step S16).

[0154] The processor 110 sends alarm information to the management device 30 indicating that a temperature anomaly has occurred at port 1 of the transmission device 200 (step S17).

[0155] When the temperature anomaly at port 1 of the transmission device 200 is resolved, the processor 210 detects that the anomaly has been resolved. The processor 210 returns the output frequency of the main signal at the line port back to the center frequency. As a result, the transmission element "alarm cleared" is sent to the transmission device 100 (step S18).

[0156] The processor 110 of the transmission device 100 detects the amount of frequency adjustment of the main signal, detects that the frequency of the main signal has returned to the center frequency, and thereby recognizes the transmission element "alarm deactivation".

[0157] The processor 110 sends an ACK, and the transmission device 200 receives the ACK (step S19).

[0158] The processor 110 sends alarm cancellation information to the management device 30 indicating that the abnormal temperature condition at port 1 of the transmission device 200 has been resolved (step S20).

[0159] [Second Embodiment] In the transmission devices 100 and 200 according to the second embodiment, a code is associated with the frequency adjustment amount of the main signal. For example, 64 codes in a 6-bit sequence are associated with frequency adjustment amounts from "+0001" to "+0064". The correspondence between frequency adjustment amounts and codes is defined, for example, in control tables 121 and 221.

[0160] Note that the configuration of the transmission devices 100 and 200 according to the second embodiment is the same as that of the transmission devices 100 and 200 according to the first embodiment. Therefore, the description of the configuration of the transmission devices 100 and 200 will be omitted.

[0161] In transmission devices 100 and 200, the meaning of each code is defined. This allows information of any meaning to be communicated between transmission devices 100 and 200 by transmitting the code through frequency adjustment of the main signal.

[0162] A delimiter may be associated with a frequency adjustment amount different from the frequency adjustment amounts "+0001" to "+0064" associated with the 64 codes mentioned above. For example, after transmitting one or more codes associated with a single meaning, a delimiter can be transmitted to notify the end of the codes used to convert to a single meaning. In other words, a delimiter can be used as a delimiter for code transmission. The receiving device can obtain the transmitted meaning by combining the codes received between the previously received delimiter and the next delimiter.

[0163] Alternatively, instead of a delimiter, a predetermined period of no transmission may be provided after transmitting the last code corresponding to a single meaning. Furthermore, instead of a delimiter, the transmission of codes may be terminated by switching frequencies at predetermined intervals.

[0164] [Third Embodiment] Figure 11 is a schematic diagram showing an example of the configuration of a transmission system according to the third embodiment. The transmission system 10A includes transmission devices 300A, 300B, 300C, and 300D in addition to transmission devices 100 and 200A.

[0165] The configuration of the transmission device 100 is the same as that described in the first embodiment, so its description will be omitted.

[0166] In this embodiment, the transmission device 200A is connected to each of the transmission devices 300A, 300B, 300C, and 300D via an optical fiber cable 41, a splitter 42, and optical fiber cables 41A, 41B, 41C, and 41D. The transmission device 200A is connected to the splitter 42 by an optical fiber cable 41, and the splitter 42 is connected to each of the transmission devices 300A, 300B, 300C, and 300D by optical fiber cables 41A, 41B, 41C, and 41D.

[0167] Transmission devices 300A, 300B, 300C, and 300D are, for example, client devices. Transmission devices 100 and 200A relay communication between the upper network 20 and transmission devices 300A, 300B, 300C, and 300D.

[0168] For example, transmission devices 300A, 300B, 300C, and 300D are communication devices compliant with OTN. In Figure 11, the management device 30 is not connected to the transmission devices 300A, 300B, 300C, and 300D, but the management device 30 may be connected to the transmission devices 300A, 300B, 300C, and 300D. The configuration of the transmission devices 300A, 300B, 300C, and 300D is the same as that of the transmission device 200 in the first embodiment, so a description is omitted.

[0169] Hereinafter, transmission devices 300A, 300B, 300C, and 300D may be collectively referred to as "transmission device 300." Similarly, optical fiber cables 41A, 41B, 41C, and 41D may be collectively referred to as "optical fiber cable 41."

[0170] Figure 12 is a block diagram showing an example of the configuration of a transmission device 200A according to the third embodiment, which is connected to multiple client devices.

[0171] The transmission device 200A according to this embodiment includes an optical communication interface 230a. The optical communication interface 230a is connected to the transmission devices 300A, 300B, 300C, and 300D. The optical communication interface 230a is a digital coherent optical transceiver.

[0172] The optical communication interface 230a is connected to the splitter 42 via an optical fiber cable 41 (Figure 11).

[0173] The optical communication interface 230a can transmit multiplexed signals, which are created by combining client signals to each of the transmission devices 300A, 300B, 300C, and 300D using frequency division multiplexing. The communication interface 230a transmits and receives client signals to and from each of the transmission devices 300A, 300B, 300C, and 300D using multiple channels, each allocated with a frequency band that does not interfere with the others.

[0174] The optical communication interface 230a transmits a multiplexed signal obtained by multiplexing multiple client signals (main signals). The splitter 42 distributes the multiplexed signal input from the transmission device 200A to the optical fiber cables 41A, 41B, 41C, and 41D. The client signals transmitted from each of the transmission devices 300A, 300B, 300C, and 300D are combined by the splitter 42 and sent to the transmission device 200A as a multiplexed signal. The optical communication interface 230a receives the multiplexed signal output from the splitter 42. The optical communication interface 230a is a DCO, and its configuration is the same as that of the optical communication interface 140 described in the first embodiment. The optical communication interface 230a can change the frequency channel for each client signal. The optical communication interface 230a can set the same frequency channel as the changed frequency channel when the frequency channel is changed in at least one of the transmission devices 300A, 300B, 300C, or 300D.

[0175] The optical communication interface 230a can adjust the carrier frequency of each client signal it transmits. Specifically, the optical communication interface 230a has a fine-tuning function that allows it to shift the carrier frequency of the client signal from its center frequency. The optical communication interface 230a can receive client signals within the frequency adjustment range of the fine-tuning function. The optical communication interface 230a can detect the amount of change in the frequency of the received client signal from the center frequency of the carrier.

[0176] In the third embodiment, the optical communication I / F230a can adjust the frequency of the carrier wave of the transmitted client signal in 1 MHz increments from the center frequency. However, the unit of frequency adjustment for the transmitted client signal is not limited to 1 MHz.

[0177] The optical communication interface 230a includes a control circuit 255 and an optical device 285.

[0178] The optical device 285 includes an optical transmitter 286 and an optical receiver 287, which are composed of photonic integrated circuits. The optical transmitter 286 and the optical receiver 287 constitute a communication port.

[0179] The control circuit 255 includes registers 256 and a processor 257. The configuration of processor 257 is the same as that of processor 152, so its description is omitted.

[0180] The processor 257 has the functions of a frequency control unit 258 and an optical input state acquisition unit 259. The frequency control unit 258 can control the frequency for each of the multiple client signals that are transmitted. That is, the frequency control unit 258 adjusts the output frequency at the optical transmitter 286 for each client signal according to the frequency adjustment amount determined by the remote control unit 211. The optical input state acquisition unit 259 can acquire the optical input state for each of the multiple client signals that are received. That is, the optical input state acquisition unit 259 monitors the optical input state at the optical receiver 287 for each client signal.

[0181] The control circuit 255 includes a transmit frame control unit 265 and a receive frame control unit 275. The transmit frame control unit 265 is connected to the receive frame control unit 270 and can perform predetermined processing on OTN frames output from the receive frame control unit 270. For example, the transmit frame control unit 265 multiplexes multiple client signals. The transmit frame control unit 265 is connected to the optical transmitter 286 and outputs the multiplexed signal to the optical transmitter 286. The optical transmitter 286 sends out the multiplexed signal received from the transmit frame control unit 265 as an optical signal.

[0182] The receiving frame control unit 275 is connected to the optical receiver 287 and receives the multiplexed signal received by the optical receiver 287. The receiving frame control unit 275 can, for example, perform frame processing for each client signal included in the multiplexed signal. The receiving frame control unit 275 can, for example, separate the multiplexed signal into multiple client signals. The receiving frame control unit 275 is connected to the transmitting frame control unit 260 and can output each client signal to the transmitting frame control unit 260.

[0183] Register 256 includes frequency adjustment amount specification areas 256A1, 256A2, 256A3, 256A4, optical input state area 256B, and detected value areas 256C1, 256C2, 256C3, 256C4.

[0184] The frequency adjustment ranges 256A1, 256A2, 256A3, and 256A4 correspond to the frequency channels used for communication with each of the transmission devices 300A, 300B, 300C, and 300D. For example, frequency adjustment range 256A1 corresponds to the frequency channel used for communication with transmission device 300A. Frequency adjustment range 256A2 corresponds to the frequency channel used for communication with transmission device 300B. Frequency adjustment range 256A3 corresponds to the frequency channel used for communication with transmission device 300C. Frequency adjustment range 256A4 corresponds to the frequency channel used for communication with transmission device 300D.

[0185] The communication interface 230a can adjust (shift) the frequency of the client signal from the center frequency for each frequency channel. The control execution unit 212 writes the frequency adjustment amount to the frequency adjustment amount specification area corresponding to the frequency channel to be adjusted. The frequency control unit 258 reads the frequency adjustment amount from the frequency adjustment amount specification area and shifts the output frequency of the client signal in the frequency channel corresponding to that frequency adjustment amount specification area from the center frequency by the read frequency adjustment amount. The communication interface 230a has one physical communication port for sending and receiving multiplexed signals, but has a virtual communication port for each frequency channel for communication with the transmission devices 300A, 300B, 300C, and 300D. In the following description, "communication port" means a virtual communication port.

[0186] The detected value areas 256C1, 256C2, 256C3, and 256C4 correspond to the communication ports used for communication with each of the transmission devices 300A, 300B, 300C, and 300D, respectively. For example, detected value area 256C1 corresponds to the communication port used for communication with transmission device 300A. Detected value area 256C2 corresponds to the communication port used for communication with transmission device 300B. Detected value area 256C3 corresponds to the communication port used for communication with transmission device 300C. Detected value area 256C4 corresponds to the communication port used for communication with transmission device 300D.

[0187] The control determination unit 214 can detect the amount of frequency adjustment of the client signal received by the optical receiver unit 287 for each frequency channel. The optical input state acquisition unit 259 detects the amount of change from the center frequency of the client signal frequency for each frequency channel in the multiplexed signal. The optical input state acquisition unit 259 writes the detected amount of frequency change of the client signal to the detection value area corresponding to that frequency channel. The control determination unit 214 detects the amount of frequency adjustment of the main signal for each communication port based on the values ​​of the amount of frequency change written to each of the detection value areas 256C1, 256C2, 256C3, and 256C4.

[0188] The other components of the transmission device 200A according to this embodiment are the same as those of the transmission device 200 according to the first embodiment; therefore, the same reference numerals are used for the same components, and their descriptions are omitted.

[0189] In the third embodiment, the transmission device 100 can receive control information from the management device 30 for remotely controlling the transmission devices 200A and 300. In this example, the remotely controlled devices (receiving devices) are the transmission devices 200A, 300A, 300B, 300C, and 300D. The transmission device 100 remotely controls the transmission device 200A. The transmission device 200A remotely controls the transmission devices 300A, 300B, 300C, and 300D. In other words, the transmission device 100 is the remote control device (transmitter) for the transmission device 200A, and the transmission device 200A is the remote control device (transmitter) for the transmission devices 300A, 300B, 300C, and 300D.

[0190] In this embodiment, the control information input from the management device 30 to the transmission device 100 is composed of a combination of multiple elements. That is, the control information can be decomposed into multiple transmission elements. The control information is composed of a combination of a controlled object and a control content. For example, the control information "Change the frequency channel of communication port 7 by +10" is composed of a combination of the controlled object "communication port 7" and the control content "Change frequency channel by +10". In another example, the control information "Alarm a temperature anomaly at communication port 5" is composed of a combination of the controlled object "communication port 5" and the control content "Alarm: Temperature Anomaly". The control information "Change the frequency channel of communication port 7 by +10" can be decomposed into the controlled object transmission element "Communication port specification (port 7)" and the control content transmission element "Change frequency channel (+10)". The control information "Alarm a temperature anomaly at communication port 5" can be decomposed into the controlled object transmission element "Communication port specification (port 5)" and the control content transmission element "Alarm: Temperature Anomaly".

[0191] The transmission device 100 can also remotely control other optical transmission devices via the transmission device 200A. For example, the transmission device 100 instructs the transmission device 200A to remotely control another optical transmission device. The transmission device 200A remotely controls the other connected optical transmission device according to the instructions of the transmission device 100. When the remote control of the other optical transmission device is completed, the transmission device 200A notifies the transmission device 100 that the switching of the remotely controlled device is complete. The transmission element "completion of switching of the remotely controlled device" corresponds to returning the changed frequency to the center frequency, that is, setting the frequency adjustment amount Δf to 0. In this way, setting the frequency adjustment amount Δf to 0 corresponds to two transmission elements: "alarm cancellation" and "completion of switching of remote control response".

[0192] The remote control unit 111 decomposes the control information input from the management device 30 into multiple transmission elements. The remote control unit 111 determines the frequency adjustment amount corresponding to the transmission element, and the control execution unit 112 adjusts the frequency of the main signal according to the frequency adjustment amount. As a result, the transmission elements are sequentially transmitted from the transmission device 100 to the transmission device 200A. The control determination unit 214 detects the frequency adjustment amount of the main signal and determines the transmission element corresponding to the detected frequency adjustment amount.

[0193] The control determination unit 214 outputs the transmission element identified by the control table 221 to the remote control unit 211. The remote control unit 211 executes control processing according to the transmission element output from the control determination unit 214. For example, when the transmission element "communication port specification" is received, the remote control unit 211 instructs the control execution unit 212 to select the specified communication port. The control execution unit 212 selects the specified communication port according to the instruction. Furthermore, when the transmission element "frequency channel change" is received, the remote control unit 211 remotely controls the frequency channel change of the opposing transmission device 300. That is, the remote control unit 211 determines the frequency adjustment amount corresponding to the transmission element "frequency channel change" and outputs the determined frequency adjustment amount to the control execution unit 212. As a result, the frequency of the carrier wave of the client signal output from the selected communication port is adjusted by the determined frequency adjustment amount, and the transmission element "frequency channel change" is transmitted to the opposing transmission device 300. After the frequency channel is changed in the transmission device 300, the remote control unit 211 instructs the control execution unit 212 to change the frequency channel by a specified amount. The control execution unit 212 changes the frequency channel of the selected communication port by the specified amount according to the instruction.

[0194] The transmission device 100 has a control table for remote control of not only the transmission device 200A but also the transmission device 300. Figure 13 shows an example of the configuration of the control table according to the third embodiment.

[0195] For example, in transmission system 10A, each of the transmission devices 300A, 300B, 300C, and 300D is assigned a client number, and these devices are managed according to their client numbers. For example, the client number for transmission device 300A is "1", the client number for transmission device 300B is "2", the client number for transmission device 300C is "3", and the client number for transmission device 300D is "4". In the following explanation, transmission device 300A will also be referred to as "client 1", transmission device 300B as "client 2", transmission device 300C as "client 3", and transmission device 300D as "client 4".

[0196] Control table 121A defines the correspondence between transmission elements for specifying the client device port and frequency adjustment amounts. The transmission element "Port Specification (Client)" for specifying the client device port is control information for specifying the line port of the transmission device 300 that is being controlled. Frequency adjustment amounts from "+0101" to "+0149" are assigned to the transmission element "Port Specification (Client)".

[0197] Transmission device 300A has a line port connected to optical fiber cable 41A. The transmission element "Port designation (client): 1" that specifies the line port of transmission device 300A corresponds to a frequency adjustment amount "+0101". Transmission device 300B has a line port connected to optical fiber cable 41B. The transmission element "Port designation (client): 2" that specifies the line port of transmission device 300B corresponds to a frequency adjustment amount "+0102". Transmission device 300C has a line port connected to optical fiber cable 41C. The transmission element "Port designation (client): 3" that specifies the line port of transmission device 300C corresponds to a frequency adjustment amount "+0103". Transmission device 300D has a line port connected to optical fiber cable 41D. The transmission element "Port designation (client): 4" that specifies the line port of transmission device 300D corresponds to a frequency adjustment amount "+0104".

[0198] The transmission device 200 has a control table 221A with the same contents as the control table 121A of the transmission device 100. The transmission device 300 has the same configuration as the transmission device 200 in the first embodiment. For example, the transmission device 300 has a control table with the same contents as the control table 221 in the first embodiment. The transmission device 200 further has a control table 221B with the same contents as the control table of the transmission device 300 (i.e., the same contents as the control table 221 described in the first embodiment). In the transmission device 200, control table 221A is used for sending and receiving transmission elements to and from the transmission device 100, and control table 221B is used for sending and receiving transmission elements to and from the transmission device 300. The port numbers of the communication ports in control table 221A correspond to the client numbers described above.

[0199] The operation of the transmission system 10A according to the third embodiment will be described below.

[0200] The transmission device 100 performs the same processing as the remote control processing described in the first embodiment. The transmission device 300 performs the same processing as the remotely controlled processing described in the first embodiment. The transmission device 200A is remotely controlled by the transmission device 100 and also performs intermediate control processing for remotely controlling the transmission device 300.

[0201] Figure 14 is a flowchart showing an example of intermediate control processing by the transmission device 200A according to the third embodiment. The flowchart shown in Figure 14 illustrates intermediate control processing for changing the frequency channel of the communication port of the transmission device 200A and the line port of the opposing transmission device 300.

[0202] The processor 210 of the transmission device 200A checks the optical input status at the optical receivers 282 and 287 (step S241). If there is no optical input (NO in step S241), the processor 210 repeats step S241.

[0203] If there is an optical input (YES in step S241), the transmission device 200A receives transmission elements related to remote control (a transmission element that specifies the communication port to be controlled, and a transmission element that specifies the frequency channel change amount). In other words, the processor 210 detects the frequency adjustment amount by monitoring the value of the frequency change amount in the detection value area 251C (step S242), and determines the transmission element corresponding to the detected frequency adjustment amount (step S243).

[0204] When the transmission device 200A receives the transmission element transmitted from the transmission device 100, the processor 210 sends an ACK to the transmission device 100 (step S244).

[0205] The processor 210 determines whether the transmission element received from the transmission device 100 is a transmission element that specifies a communication port or a transmission element that specifies the amount of change in the frequency channel (step S245). If it is a transmission element that specifies a communication port (in step S245, "communication port specification"), the processor 210 recognizes the communication port to be controlled from the transmission element (step S246).

[0206] If the transmission element received from the transmission device 100 is a transmission element that specifies a communication port, the processor 210 returns to step S242 and receives a transmission element that specifies the amount of change in the frequency channel.

[0207] If the transmission element received from the transmission device 100 is a transmission element that specifies the amount of frequency channel change (in step S245, "frequency channel change"), the processor 210 refers to the control table 221A and determines the frequency adjustment amount corresponding to the transmission element that specifies the amount of frequency channel change received from the transmission device 100 (step S247).

[0208] The processor 210 writes the determined frequency adjustment amount to the frequency adjustment amount specification area 256A1, 256A2, 256A3, 256A4 of register 256 that corresponds to the communication port recognized as the control target (step S248). The processor 257 of the optical communication I / F 230A reads the frequency adjustment amount from the frequency adjustment amount specification area of ​​register 256 and adjusts the output frequency of the main signal of the communication port (frequency channel) corresponding to the frequency adjustment amount specification area from which the frequency adjustment amount was read by the specified frequency adjustment amount from the center frequency.

[0209] When the transmission element is transmitted to the transmission device 300 by adjusting the frequency of the main signal, the transmission device 300 replies with an ACK. The processor 210 receives the ACK from the transmission device 300 (step S249).

[0210] The processor 210 performs a process to change the frequency channel of the communication port used for communication with the controlled transmission device 300 by a specified amount (step S250).

[0211] When the processor 210 has finished changing the frequency channel and linked up with the transmission device 300, it sends the transmission element "Switching complete" to the transmission device 100 (step S251). Upon receiving the transmission element "Switching complete," the transmission device 100 replies with an ACK. The processor 210 receives the ACK from the transmission device 200 (step S252) and returns to step S241.

[0212] Figure 15 is a sequence diagram illustrating an example of remote control for changing the frequency channel of the communication port of the transmission device 300. Figure 15 shows an example where the transmission device 300C is specified as the control target.

[0213] Here, the virtual communication port for transmission device 300A is designated as "Port 1," the virtual communication port for transmission device 300B as "Port 2," the virtual communication port for transmission device 300C as "Port 3," and the virtual communication port for transmission device 300D as "Port 4."

[0214] When the processor 110 of the transmission device 100 receives the control information "Change the frequency channel of port 3 by +5" from the management device 30, it decomposes the control information and recognizes the transmission elements "Communication port specification (port 3)" and "Frequency channel change (+5)".

[0215] The processor 110 refers to the control table 121A and determines the frequency adjustment amount "+0003" corresponding to the transmission element "communication port specification (port 3)". The processor 110 writes the frequency adjustment amount "+0003" to the frequency adjustment amount specification area 151A of the register 151. As a result, the output frequency of the main signal in the optical transmitter 181 increases by 3 MHz from the center frequency (step S21).

[0216] The processor 210 of the transmission device 200A detects the frequency adjustment amount of the main signal of the line port. The processor 210 refers to the control table 221A and determines the transmission element "communication port specification (port 3)" corresponding to the detected frequency adjustment amount "+0003". As a result, the processor 210 recognizes that the controlled object is communication port 3 of the transmission device 200A (and the line port of the transmission device 300C).

[0217] The processor 210 increases the output frequency of the optical transmitter 281 by 50 MHz from the center frequency of the main signal and sends an ACK to the transmission device 100 (step S22).

[0218] When the processor 110 of the transmission device 100 receives an ACK, it refers to the control table 121A and determines a frequency adjustment amount "+0005" corresponding to the transmission element "frequency channel change (+5)". The processor 110 increases the center frequency of the main signal in the optical transmitter 181 by 5 MHz (step S23).

[0219] The processor 210 of the transmission device 200A detects the amount of change in the receiving frequency at the optical receiver 282. The processor 210 refers to the control table 221A and determines the transmission element "frequency channel change (+5)" corresponding to the detected frequency adjustment amount "+0005". As a result, the processor 210 recognizes that the control content is to increase the frequency channel by 5.

[0220] When the processor 210 receives the transmission element "frequency channel change (+5)", it sends an ACK. At this time, since the frequency adjustment amount indicating the previous ACK was "+0050", the processor 210 recognizes that the frequency adjustment amount indicating the current ACK should be "-0050". The processor 210 reduces the output frequency of the optical transmitter 281 by 50 MHz from the center frequency of the main signal and sends an ACK to the transmission device 100 (step S24).

[0221] The processor 210 of transmission device 200A transmits the transmission element "frequency channel (+5)" to transmission device 300C opposite port 3 (step S31). In other words, the processor 210 writes the frequency adjustment amount "+0005" to the frequency adjustment amount specification area 256A3 of register 256. As a result, the frequency of the main signal on port 3 increases by 5 MHz from the center frequency.

[0222] When the transmission device 300C receives the transmission element "frequency channel (+5)", it increases the frequency of the main signal in the line port by 50 MHz from the center frequency and sends an ACK to the transmission device 200A (step S32).

[0223] Transmission devices 200A and 300C perform control processing to increase the frequency channel by 5 (steps S33 and S34). Once the frequency channel change is complete, transmission devices 200A and 300C link up (step S35).

[0224] Once the link-up is complete, the processor 210 of the transmission device 200A returns the output frequency of the main signal at the line port back to the center frequency. This sends the transmission element "switching complete" to the transmission device 100 (step S25). The processor 110 of the transmission device 100 sends the transmission element "ACK", and the transmission device 200A receives the ACK (step S26).

[0225] If an abnormality occurs in the transmission device 300, the transmission device 300 sends an alarm to the transmission device 200A. The transmission device 200A performs alarm relay processing to relay the alarm sent from the transmission device 300 to the transmission device 100 connected to the management device 30.

[0226] The transmission device 300 performs the same process as the alarm transmission process described in the first embodiment. The transmission device 100 performs the same process as the alarm reception process described in the first embodiment.

[0227] Figures 16A and 16B are flowcharts illustrating an example of alarm relay processing by the transmission device 200A according to the third embodiment.

[0228] The processor 210 of the transmission device 200A checks the optical input status at the optical receivers 282 and 287 (step S261). If there is no optical input (NO in step S261), the processor 210 repeats step S261.

[0229] When the transmission device 300 detects an abnormality in the line port, it sends a transmission element "interrupt" to the transmission device 200A.

[0230] If there is an optical input (YES in step S261), the transmission device 200A receives the transmission element "interrupt" transmitted from the transmission device 300 (step S262). In other words, the processor 210 detects the frequency adjustment amount at each of the communication ports 1 to 4 by monitoring the frequency values ​​in the detection value regions 256C1 to 256C4, and determines the transmission element corresponding to the detected frequency adjustment amount. If the processor 210 receives the transmission element "interrupt" while executing, for example, a remotely controlled process or an intermediate control process, it interrupts the remotely controlled process or the intermediate control process.

[0231] When the transmission device 200A receives the transmission element "interrupt", the processor 210 sends an ACK to the transmission device 300 that sent the interrupt (step S263). That is, the processor 11 refers to the control table 121A and determines the frequency adjustment amount corresponding to the transmission element "ACK". The processor 210 writes the determined frequency adjustment amount to one of the frequency adjustment amount specification areas 256A1 to 256A4 of the register 256 that corresponds to the transmission device 300 to which the ACK is sent.

[0232] After sending the "ACK" transmission element, the processor 210 receives the alarm transmission elements (a transmission element that specifies the line port or communication port where the abnormality was detected, and an alarm transmission element). In other words, the processor 210 detects the frequency adjustment amount by monitoring the frequency value in the detection value region corresponding to the frequency channel for the transmission device 300 that is the source of the interrupt (step S264), and determines the transmission element corresponding to the detected frequency adjustment amount (step S265).

[0233] When the transmission device 200A receives the transmission element transmitted from the transmission device 300, the processor 210 sends an ACK to the transmission device 300 (step S266).

[0234] The processor 210 determines whether the transmission element received from the transmission device 300 is a transmission element that specifies the port (line port or communication port) where an abnormality was detected, or a transmission element that indicates the type of abnormality (step S267). If it is a transmission element that specifies a port ("port specification" in step S267), the processor 210 recognizes that the transmission device 300 that sent the transmission element is the target of the detected abnormality, and that the port where the abnormality was detected is (step S268). In this case, the processor 210 returns to step S264 and receives the alarm transmission element.

[0235] If the transmission element received from the transmission device 300 is an alarm transmission element (indicated as "alarm" in step S267), the processor 210 sends the transmission element "interrupt" to the transmission device 100 (step S269). When the transmission element "interrupt" is sent to the transmission device 100, the transmission device 100 replies with an ACK. The processor 210 receives the ACK from the transmission device 100 (step S270).

[0236] The processor 210 determines a transmission element that specifies the transmission device 300 (or its line port) where an abnormality has been detected, and an alarm transmission element (step S271). For example, if a temperature abnormality is detected at the line port of transmission device 300A, the transmission elements "Port specification (client): 1" and "Alarm: Temperature abnormality" are determined in step S271. The order in which the transmission elements are transmitted is also determined in step S271. The transmission element "Communication port specification" is used to notify of an abnormality at the communication port of transmission device 200A. For example, if an abnormality is detected at communication port 1 of transmission device 200A, transmission device 200A sends the transmission element "Communication port specification (port number 1)" to transmission device 100.

[0237] The processor 210 transmits each determined transmission element to the transmission device 100 by shifting the frequency of the main signal in the optical transmitter 281 from the center frequency (steps S272 to S274).

[0238] When the transmission element is transmitted to the transmission device 100 by adjusting the frequency of the main signal, the transmission device 100 replies with an ACK. The processor 210 receives the ACK from the transmission device 200A (step S275).

[0239] Next, the processor 210 determines whether all transmission elements have been transmitted (step S276). If there are any transmission elements that have not been transmitted (NO in step S276), the process returns to step S272 and selects the remaining transmission elements to be transmitted. As a result, the transmission element specifying the port of the transmission device 300 where the abnormality was detected, and the alarm transmission element are transmitted to the transmission device 100.

[0240] When the transmission device 300, which has experienced an abnormality, detects that the line port has recovered from its abnormal state, it transmits the "alarm cleared" message to the transmission device 200A.

[0241] If all transmission elements have been transmitted (YES in step S276), the processor 210 determines whether or not it has received an alarm cancellation from the transmission device 300 (step S277). If it has not received an alarm cancellation (NO in step S277), the processor 210 repeats step S277.

[0242] If an alarm cancellation is received (YES in step S277), the processor 210 transmits the transmission element "alarm cancellation" to the transmission device 100 (step S278). Upon receiving the transmission element "alarm cancellation", the transmission device 100 replies with an ACK. The processor 210 receives the ACK from the transmission device 200 (step S279) and returns to step S261.

[0243] Figure 17 is a sequence diagram illustrating an example of an alarm notification for a line port abnormality of the transmission device 300. Figure 17 shows an example where an abnormality is detected in the line port of the transmission device 300A.

[0244] When the transmission device 300A detects a temperature anomaly in the line port, it refers to the control table and determines a frequency adjustment amount "-0100" corresponding to the transmission element "interrupt". The transmission device 300A transmits the transmission element "interrupt" to the transmission device 200A by adjusting the frequency of the main signal (step S41).

[0245] The processor 210 of the transmission device 200A monitors the frequency values ​​in the detection value areas 256C1 to 256C4 of the register 256 and detects the frequency adjustment amount for the first channel. The processor 210 refers to the control table 221A and determines the transmission element "interrupt" corresponding to the detected frequency adjustment amount "-0100".

[0246] The processor 210 sends the transmission element "ACK", and the transmission device 300A receives the ACK (step S42).

[0247] The transmission device 300A determines the transmission element "line port designation" and the transmission element "alarm: temperature abnormality".

[0248] The transmission device 300A shifts the output frequency of the main signal from the center frequency by a frequency adjustment amount "-0001" corresponding to the transmission element "line port specification". As a result, the transmission element "line port specification" is transmitted to the transmission device 200A (step S43).

[0249] The processor 210 of the transmission device 200A detects the frequency adjustment amount of the first channel and recognizes the transmission element "line port designation" corresponding to the detected frequency adjustment amount.

[0250] The processor 210 sends the transmission element "ACK", and the transmission device 300A receives the ACK (step S44).

[0251] The transmission device 300A changes the output frequency of the main signal from the center frequency by a frequency adjustment amount "+0051" corresponding to the transmission element "Alarm: Temperature Anomaly". As a result, the transmission element "Alarm: Temperature Anomaly" is transmitted to the transmission device 200A (step S45).

[0252] The processor 210 of the transmission device 200A detects the frequency adjustment amount of the first channel and recognizes the transmission element "Alarm: Temperature Anomaly" corresponding to the detected frequency adjustment amount.

[0253] The processor 210 sends the transmission element "ACK", and the transmission device 300A receives the ACK (step S46).

[0254] The processor 210 sends the transmission element "interrupt" to the transmission device 100, and the transmission device 100 receives the transmission element "interrupt" (step S51).

[0255] The processor 110 of the transmission device 100 transmits the transmission element "ACK", and the transmission device 200A receives the ACK (step S52).

[0256] The processor 210 of the transmission device 200A recognizes that a temperature anomaly has been detected at the line port of the transmission device 300A, upon receiving the transmission elements "Line port specification" and "Alarm: Temperature anomaly" from the transmission device 300A. Based on this, the processor 210 determines which transmission elements to send to the transmission device 100: "Port specification (client): 1" and "Alarm: Temperature anomaly".

[0257] The processor 210 changes the output frequency of the main signal of the line port from the center frequency by a frequency adjustment amount "+0101" corresponding to the transmission element "Port designation (client): 1". As a result, the transmission element "Port designation (client): 1" is transmitted to the transmission device 100 (step S53).

[0258] The processor 110 of the transmission device 100 detects the amount of frequency adjustment of the main signal of the line port and recognizes the transmission element "port designation (client): 1" corresponding to the detected amount of frequency adjustment.

[0259] The processor 110 sends the transmission element "ACK", and the transmission device 200A receives the ACK (step S54).

[0260] The processor 210 changes the output frequency of the main signal of the line port from the center frequency by a frequency adjustment amount "+0051" corresponding to the transmission element "Alarm: Temperature Anomaly". As a result, the transmission element "Alarm: Temperature Anomaly" is transmitted to the transmission device 100 (step S55).

[0261] The processor 110 of the transmission device 100 detects the amount of frequency adjustment of the main signal of the line port and recognizes the transmission element "Alarm: Temperature Anomaly" corresponding to the detected amount of frequency adjustment.

[0262] The processor 110 sends the transmission element "ACK", and the transmission device 200A receives the ACK (step S56).

[0263] The processor 110 sends alarm information to the management device 30 indicating that a temperature anomaly has occurred at the communication port of the transmission device 300A (step S57).

[0264] When the temperature anomaly in transmission device 300A is resolved, transmission device 300A detects that the anomaly has been resolved. Transmission device 300A changes the output frequency of the main signal from the center frequency by a frequency adjustment amount "-0100" corresponding to the transmission element "alarm release". As a result, the transmission element "alarm release" is transmitted to transmission device 200A (step S47).

[0265] When the processor 210 of the transmission device 200A receives the transmission element "alarm release" from the transmission device 300A, it sends the transmission element "ACK" to the transmission device 300A, and the transmission device 300A receives the ACK (step S48). The processor 210 determines the frequency adjustment amount "-0100" corresponding to the transmission element "alarm release" and changes the output frequency of the main signal of the line port from the center frequency. As a result, the transmission element "alarm release" is transmitted to the transmission device 100 (step S58).

[0266] When the processor 110 receives the transmission element "alarm cleared" from the transmission device 300, it sends the transmission element "ACK" to the transmission device 200, and the transmission device 200 receives the ACK (step S59). The processor 110 then sends alarm cleared information to the management device 30 indicating that the temperature abnormality condition at the communication port of the transmission device 300A has been resolved (step S60).

[0267] [Fourth Embodiment] Figure 18 is a schematic diagram showing an example of the configuration of a transmission system according to the fourth embodiment. The transmission device 200B of the transmission system 10B is equipped with multiple physical communication ports for communication with client devices, and each communication port is connected to transmission devices 300A, 300B, 300C, and 300D.

[0268] The port number of the communication port connected to transmission device 300A is designated as "1", the port number of the communication port connected to transmission device 300B is designated as "2", the port number of the communication port connected to transmission device 300C is designated as "3", and the port number of the communication port connected to transmission device 300D is designated as "4".

[0269] Port 1 of transmission device 200B and transmission device 300A are connected by optical fiber cable 42A. Port 2 of transmission device 200B and transmission device 300B are connected by optical fiber cable 42B. Port 3 of transmission device 200B and transmission device 300C are connected by optical fiber cable 42C. Port 4 of transmission device 200B and transmission device 300D are connected by optical fiber cable 42D.

[0270] Figure 19 is a block diagram showing an example of the configuration of a transmission device 200B according to the fourth embodiment, connected to multiple client devices. In Figure 19, a part of the configuration of the transmission device 200B is shown, and the optical communication I / F 240 is omitted. The configuration of the optical communication I / F 240 is the same as the configuration described in the first embodiment, so its description is omitted. The processor 210 and the management communication I / F 290 are also the same as the configuration described in the first embodiment, so their descriptions are omitted.

[0271] The transmission device 200B includes optical communication I / Fs 230_1, 230_2, 230_3, and 230_4. The optical communication I / F 230_1 constitutes communication port 1 and is connected to the line port of the transmission device 300A. The optical communication I / F 230_2 constitutes communication port 2 and is connected to the line port of the transmission device 300B. The optical communication I / F 230_3 constitutes communication port 3 and is connected to the line port of the transmission device 300C. The optical communication I / F 230_4 constitutes communication port 4 and is connected to the line port of the transmission device 300D. In the following description, the last digit of the optical communication I / Fs 230_1, 230_2, 230_3, and 230_4 is denoted as "N", and may be expressed as the optical communication I / F 230_N. The last digits of the reference numerals of the components of each of the optical communication I / Fs 230_1, 230_2, 230_3, and 230_4 are also assigned numbers from 1 to 4, and these may also be denoted as "N" in the same manner.

[0272] The communication port 230_N includes a control circuit 255_N and an optical device 285_N.

[0273] The control circuit 255_N includes a register 256_N, a processor 257_N, a transmission frame control unit 265_N, and a reception frame control unit 275_N.

[0274] The register 256_N includes a frequency adjustment amount designation area 256A_N, an optical input state area 256B_N, and a detection value area 256C_N. Since the configuration of the register 256_N is the same as that of the register 151, the description thereof is omitted.

[0275] The processor 257_N has functions of a frequency control unit 258_N and an optical input state acquisition unit 259_N. Since the frequency control unit 258_N and the optical input state acquisition unit 259_N have the same functions as the frequency control unit 153 and the optical input state acquisition unit 154, the description thereof is omitted.

[0276] The transmission device 200B includes a switch circuit 295. The switch circuit 295 is connected to a transmission frame control unit 260 and a reception frame control unit 270. Further, the switch circuit 295 is connected to each of transmission frame control units 265_1, 265_2, 265_3, 265_4 and each of reception frame control units 275_1, 275_2, 275_3, 275_4.

[0277] For example, a multiplexed signal in which client signals are time-division multiplexed is output from the reception frame control unit 270 to the switch circuit 295. The switch circuit 295 divides the multiplexed signal into a plurality of client signals and distributes each client signal to each of the transmission frame control units 265_1, 265_2, 265_3, 265_4.

[0278] The switch circuit 295 is, for example, an OTN cross-connect. As another example, the switch circuit 295 may be an Ethernet switch such as an L2 switch. That is, the switch circuit 295 may perform distribution processing of client signals in units of OTN frames or may perform distribution processing of client signals in units of Ethernet frames, and the distribution method thereof is not limited.

[0279] The transmission frame control unit 265_N performs predetermined frame processing on the input client signal and outputs it to the optical transmitter 286_N. Since the configuration of the optical transmitter 286_N is the same as that of the optical transmitter 181, the description thereof is omitted.

[0280] The optical receiver 287_N photoelectrically converts the received client signal and outputs it to the reception frame control unit 265_N. The reception frame control unit 265_N performs predetermined frame processing on the input client signal and outputs it to the switch circuit 295. Since the configuration of the optical receiver 287_N is the same as that of the optical receiver 182, the description thereof is omitted.

[0281] The switch circuit 295, for example, time-division multiplexes multiple client signals input from the receive frame control unit 275_N and outputs the multiplexed signal to the transmit frame control unit 260.

[0282] In the fourth embodiment, the transmission element is transmitted by controlling the frequency of the main signal transmitted from the communication port of the transmission devices 300A, 300B, 300C, and 300D that corresponds to the target of remote control (i.e., the communication port connected to the transmission device 300 that is the target of remote control). Specifically, the control execution unit 212 writes the frequency adjustment amount to the frequency adjustment amount specification area 256A_N of the optical communication I / F 230_N corresponding to the target of control.

[0283] In other words, in the third embodiment, the processor 210 sends a transmission element to the controlled device by writing the frequency adjustment amount to one of the frequency adjustment amount specification areas 256A1, 256A2, 256A3, and 256A4 provided in register 256, which is associated with a virtual communication port for communication with the controlled transmission device 300. In contrast, in the fourth embodiment, the processor 210 sends a transmission element to the controlled device by writing the frequency adjustment amount to one of the frequency adjustment amount specification areas 256A_N provided in each of registers 256_N, which is associated with a communication port for communication with the controlled transmission device 300.

[0284] Furthermore, the control determination unit 214 can individually detect frequency adjustments of the main signals transmitted from the transmission devices 300A, 300B, 300C, and 300D by monitoring the detected values ​​of the frequency change amount in the respective detection value areas 256C_1, 256C_2, 256C_3, and 256C_4 of the registers 256_1, 256_2, 256_3, and 256_4.

[0285] In other words, in the third embodiment, the processor 210 monitors the values ​​of the detection value areas 256C1, 256C2, 256C3, and 256C4 provided in register 256, and receives a transmission element from the transmission device 300 using a virtual communication port corresponding to the detection value area based on the amount of change in the frequency change value in one detection value area. In contrast, in the fourth embodiment, the processor 210 monitors the values ​​of the detection value area 256C_N provided in each of register 256_N, and receives a transmission element from the transmission device 300 connected to the communication port corresponding to the detection value area based on the value of the frequency change value in one detection value area.

[0286] The optical input detection unit 213 can read the optical input state information in the optical input state areas 256B_1, 256B_2, 256B_3, and 256B_4 of registers 256_1, 256_2, 256_3, and 256_4, respectively. This allows the optical input detection unit 213 to individually determine whether or not there is an optical signal input from the optical fiber cables 42A, 42B, 42C, and 42D.

[0287] Based on the above, the transmission device 200B according to the fourth embodiment can also perform the same processing as the intermediate control processing and alarm relay processing described in the third embodiment.

[0288] [6. Supplementary Notes] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than by the embodiments described above, and includes all modifications within the meaning and scope of the equivalents of the claims. [Explanation of symbols]

[0289] 10, 10A, 10B transmission system 20 Upper Network 21 Lower Network 30 Management device 31 Management Network 40, 41, 41A, 41B, 41C, 41D, 42A, 42B, 42C, 42D Optical Fiber Cable 42 Splitter 100, 200, 200A, 200B, 300A, 300B, 300C, 300D Transmission Device (Transmitter, Receiver) 110, 210 Processor 111, 211 Remote Control Unit (Transmission - Side Control Unit, Reception - Side Control Unit) 112, 212 Control Execution Unit 113, 213 Optical Input Detection Unit 114, 214 Control Decision Unit 120, 220 Memory 121, 221, 221A, 221B Control Table (Transmission - Side Control Table, Reception - Side Control Table) 130, 230 Communication Interface (Communication I / F) 150, 250 Control Circuit 140, 240 Optical Communication Interface (Optical Communication I / F) 151, 251, 256, 256_1, 256_2, 256_3, 256_4 Register 151A, 251A, 256A1, 256A2, 256A3, 256A4, 256A_1, 256A_2, 256A_3, 256A_4 Frequency Adjustment Amount Designation Area (Transmission - Side Storage Unit) 151B, 251B, 256B, 256B_1, 256B_2, 256B_3, 256B_4 Optical Input State Area 151C, 251C, 256C1, 256C2, 256C3, 256C4, 256C_1, 256C_2, 256C_3, 256C_4 Detection Value Area (Reception - Side Storage Unit) 152, 252, 257, 257_1, 257_2, 257_3, 257_4 Processor 153, 253, 258, 258_1, 258_2, 258_3, 258_4 Frequency Control Unit 154, 254, 259, 259_1, 259_2, 259_3, 259_4 Optical Input State Acquisition Unit 160, 260, 265, 265_1, 265_2, 265_3, 265_4 Transmission Frame Control Unit 170,270,275,275_1,275_2,275_3,275_4 Received frame control unit 180,280,285,285_1,285_2,285_3,285_4 Optical devices 181,281,286,286_1,286_2,286_3,286_4 Optical Transmitter (Optical Transmitter Section) 182,282,287,287_1,287_2,287_3,287_4 Optical receiver (optical receiving unit) 190,290 Management Communication Interface (Management Communication I / F) 230a, 230_1, 230_2, 230_3, 230_4 Optical Communication Interface (Optical Communication I / F) 295 Switch Circuit

Claims

1. A transmitting device that transmits the main signal, A receiving device connected to the transmitting device via an optical transmission path, which receives the main signal transmitted from the transmitting device, Equipped with, The transmitting device is An optical transmission unit connected to the optical transmission path and capable of adjusting the frequency of the main signal sent to the optical transmission path, A transmitting-side control unit that determines the frequency adjustment amount for causing the receiving device to perform control processing, A frequency control unit that adjusts the frequency of the main signal in the optical transmission unit according to the frequency adjustment amount determined by the transmitting-side control unit, Includes, The receiving device is, An optical receiving unit connected to the optical transmission path and receiving the main signal via the optical transmission path, A control determination unit for detecting the amount of frequency adjustment of the main signal received by the optical receiving unit, A receiving-side control unit that executes the control process based on the frequency adjustment amount detected by the control determination unit, including, Transmission system.

2. The transmitting device further includes a transmitting-side storage unit that stores the frequency adjustment amount determined by the transmitting-side control unit, The frequency control unit adjusts the frequency of the main signal in the optical transmission unit according to the frequency adjustment amount stored in the transmitting-side storage unit. The transmission system according to claim 1.

3. Each of the optical transmitting unit and the optical receiving unit is a digital coherent optical transceiver having a Fine Tuning function. The transmitting-side storage unit is a specific region in a register provided in the digital coherent optical transceiver, which is the optical transmitting unit. The transmission system according to claim 2.

4. The receiving device further includes a receiving-side storage unit that stores values ​​relating to the changing frequency of the main signal received by the optical receiving unit, The control determination unit detects the amount of frequency adjustment of the main signal based on the value relating to the changing frequency stored in the receiving-side storage unit. The transmission system according to claim 1.

5. Each of the optical transmitting unit and the optical receiving unit is a digital coherent optical transceiver having a Fine Tuning function. The receiving-side storage unit is a specific region in a register provided in the digital coherent optical transceiver, which is the optical receiving unit. The transmission system according to claim 4.

6. The transmitting control unit determines the frequency adjustment amount corresponding to an element according to the correspondence between the element and the frequency adjustment amount included in the control information for remotely controlling the receiving device. The control determination unit determines the element corresponding to the frequency adjustment amount according to the correspondence between the elements included in the control information and the frequency adjustment amount. The transmission system according to claim 1.

7. The receiving device includes a plurality of communication ports, The aforementioned correspondence includes the correspondence between the multiple communication ports and the frequency adjustment amount. The transmission system according to claim 6.

8. The aforementioned correspondence includes the correspondence between the amount of frequency channel change and the amount of frequency adjustment in the receiving device. The transmission system according to claim 6.

9. The aforementioned correspondence includes the correspondence between the response signal and the frequency adjustment amount. The transmission system according to claim 6.

10. The aforementioned correspondence includes the correspondence between the type of alarm and the amount of frequency adjustment. The transmission system according to claim 6.

11. The aforementioned correspondence includes the correspondence between the code and the frequency adjustment amount. The transmission system according to claim 6.

12. The control determination unit detects the amount of frequency adjustment for the main signal when the frequency of the main signal received by the optical receiver changes at predetermined time intervals and matches multiple times consecutively. The transmission system according to any one of claims 1 to 11.

13. A transmitting device that is connected to a receiving device via an optical transmission path and transmits a main signal, An optical transmission unit connected to the optical transmission path and capable of adjusting the frequency of the main signal sent to the optical transmission path, A transmitting-side control unit that determines the frequency adjustment amount for causing the receiving device to perform control processing, A frequency control unit that adjusts the frequency of the main signal in the optical transmission unit according to the frequency adjustment amount determined by the transmitting-side control unit, Equipped with, Transmitter.

14. A receiving device connected to a transmitting device via an optical transmission path, which receives a main signal transmitted from the transmitting device, An optical receiving unit connected to the optical transmission path and receiving the main signal via the optical transmission path, A control determination unit for detecting the amount of frequency adjustment of the main signal received by the optical receiving unit, A receiving-side control unit that performs control processing based on the frequency adjustment amount detected by the control determination unit, Equipped with, Receiving device.

15. A remote control method for a transmission system including a transmitting device that transmits a main signal and a receiving device connected to the transmitting device via an optical transmission path, wherein the transmitting device remotely controls the receiving device, The transmitting device determines the amount of frequency adjustment for the main signal that causes the receiving device to perform control processing, The transmitting device performs the step of changing the output frequency of the main signal in the optical transmitting section connected to the optical transmission path according to a determined frequency adjustment amount. The receiving device includes the step of detecting the amount of frequency adjustment of the main signal received by the optical receiving unit connected to the optical transmission path, The receiving device performs the control process based on the detected frequency adjustment amount, including, Remote control method.

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