Signal transmission system and field switch

Abstract

The invention discloses a signal transmission system and a field switch, and relates to the technical field of communication. The signal transmission system comprises an optical line terminal, an optical distribution network and a field switch, the field switch has a PON optical signal and APL Ethernet signal conversion function; wherein the optical line terminal is connected with the control system through a standard Ethernet; the optical line terminal is connected with the optical distribution network through an optical fiber; the optical distribution network is connected with the on-site switch through an optical fiber, and the on-site switch is connected with the on-site device based on the APL Ethernet. A PON communication technology is used, and a power switch and a field switch in a traditional APL Ethernet solution are combined into a field switch with a PON optical signal and APL Ethernet signal conversion function, so that topology levels, the number of optical fibers and network cables and cables required in field construction are effectively reduced; therefore, the equipment cost and the construction difficulty and cost are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a signal transmission system and a field switch. Background Art

[0002] In the process industry, the data transmission method between field instruments and control room control systems has long relied on analog signals superimposed on HART low-speed signals. This transmission method has many limitations, such as high wiring costs and low information transmission rates, and cannot meet the requirements of modern digital factories for advanced production methods such as remote maintenance, edge computing, and predictive maintenance.

[0003] To solve the above problems, Ethernet Advanced Physical Layer (APL) came into being. APL Ethernet is an industrial bus technology based on Ethernet, which has the advantage of "one network to the end" and can realize full digital high-speed data transmission from field instruments to control systems.

[0004] However, the existing APL Ethernet solution still has some shortcomings. Its typical network architecture includes power switches, field switches and APL-based field devices. This architecture still has many disadvantages, such as multiple architectural levels, and the limitations of communication distance and point-to-point communication methods on the transmission medium, which leads to great engineering difficulty and high solution cost. Summary of the invention

[0005] The present invention provides a signal transmission system and a field switch to solve the problems in the process industry that the existing APL Ethernet solution has multiple structural levels and is limited by the communication distance and communication mode of the transmission medium, resulting in great engineering difficulty and high solution cost.

[0006] In a first aspect, an embodiment of the present invention provides a signal transmission system, comprising: an optical line terminal, an optical distribution network, and a field switch supporting APL Ethernet; the field switch has a conversion function between a PON optical signal and an APL Ethernet signal;

[0007] Wherein, the optical line terminal is connected to the control system via standard Ethernet; the optical line terminal is connected to the optical distribution network via optical fiber; the optical distribution network is connected to the field switch via optical fiber, and the field switch is connected to the field equipment based on APL Ethernet.

[0008] In a second aspect, an embodiment of the present invention provides a field switch, which is deployed in the signal transmission system described in any embodiment of the present invention, and the field switch includes: an optical module, a PON chip, a switching chip, a power management module, an APL physical layer module and a processor;

[0009] Among them, the power management module is respectively connected to the optical module, the PON chip, and the switching chip; the processor is respectively connected to the PON chip, the switching chip and the APL physical layer module; the optical module is connected to the optical distribution network in the signal transmission system through an optical fiber, and the optical module, the PON chip, the switching chip and the APL physical layer module are connected in sequence; the APL physical layer module is connected to the field equipment in the signal transmission system.

[0010] The technical solution of the embodiment of the present invention provides a signal transmission system, including an optical line terminal, an optical distribution network and a field switch; the field switch has a conversion function of PON optical signal and APL Ethernet signal; wherein the optical line terminal is connected to the control system through standard Ethernet; the optical line terminal is connected to the optical distribution network through optical fiber; the optical distribution network is connected to the field switch through optical fiber, and the field switch is connected to the field device based on APL Ethernet. PON communication technology is used and the power switch and the field switch in the traditional APL Ethernet solution are merged into a field switch with the conversion function of PON optical signal and APL Ethernet signal, so as to realize the organic integration of passive optical network PON communication technology, distributed control system (Distributed Control System, DCS) and APL Ethernet, solve the problem that the existing APL Ethernet solution in the process industry has many structural levels and is limited by the communication distance and communication mode of the transmission medium, resulting in great engineering difficulty and high solution cost, and has the beneficial effect of effectively reducing the topological level, the number of optical fibers and network cables, and the cables required in the field construction, thereby effectively reducing the equipment cost and the construction difficulty and cost.

[0011] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A topological diagram of an APL Ethernet system provided by the prior art;

[0014] Figure 2 A topological diagram of a signal transmission system provided in Embodiment 1 of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of a field switch provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0017] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0018] Figure 1 A topological diagram of an APL Ethernet system provided by the prior art is shown as follows: Figure 1 As shown, the APL Ethernet system includes: power switch, field switch and field equipment. The upstream interface of the power switch is electrical / optical Ethernet, and the downstream interface is 10M Ethernet with 46V~50V power supply. The upstream interface of the field switch is 10M Ethernet with 46V~50V power supply, and the downstream interface is 10M Ethernet with 9~15V power supply.

[0019] The above APL Ethernet system has the following problems:

[0020] (1) The solution architecture has many levels. The data transmission between the control system and the field instrument needs to go through the path of "APL instrument-APL field switch-APL power switch". The cost of many levels is high system construction cost.

[0021] (2) The upstream of the power switch is the data switch of the control system, which is connected by optical fiber / network cable. If it is a network cable, there is a distance limitation; if it is optical fiber, the point-to-point communication of optical fiber means that a large number of optical fibers need to be deployed, which will lead to high costs.

[0022] (3) Since there is a one-to-one connection between the port of the field switch and the field equipment, the field switch supports splitting ratios such as 1:4 / 1:8. When there are many field devices, a large number of field switches are required, which means that the number and length of the trunk lines between the power switch and the field switch are high, resulting in high engineering difficulty, cost, and safety risks.

[0023] PON supports splitting ratios such as 1:64 / 1:128, which can significantly reduce the number of optical fibers, thereby effectively reducing infrastructure costs. The current bandwidth rate is 1Gbps, which can be seamlessly upgraded to 10G, 40G and 100G, fully meeting customers' bandwidth needs. It is plug-and-play and easy to use.

[0024] Therefore, the embodiments of the present invention utilize the characteristics of Passive Optical Network (PON) with high cost-effectiveness, easy installation and strong flexibility, and organically integrate Passive Optical Network PON communication technology, Distributed Control System (DCS) and APL Ethernet to realize signal transmission between field equipment and control system.

[0025] Embodiment 1

[0026] Figure 2 This is a topological diagram of a signal transmission system provided in Embodiment 1 of the present invention. This embodiment is applicable to industrial signal transmission between an Ethernet-based control system and an APL Ethernet-based field device in a process industry.

[0027] like Figure 2 As shown, the signal transmission system includes: an optical line terminal 10, an optical distribution network 20 and a field switch 30 supporting APL Ethernet; the field switch 30 has the function of converting PON optical signals and APL Ethernet signals; wherein the optical line terminal 10 is connected to the control system 40 through standard Ethernet; the optical line terminal 10 is connected to the optical distribution network 20 through optical fiber; the optical distribution network 20 is connected to the field switch 30 through optical fiber, and the field switch 30 is connected to the field device 50 based on APL Ethernet.

[0028] In the field of communications, passive optical network PON is a broadband access technology that uses a point-to-multipoint network structure and passive optical fiber transmission to provide a variety of integrated services. It has the advantages of high cost-effectiveness, easy installation, and flexible network access methods. PON mainly consists of three parts: Optical Line Terminal (OLT), Optical Distribution Network (ODN) and Optical Network Terminal (ONT). OLT is responsible for signal conversion, network management and bandwidth allocation. ODN is composed of passive devices such as splitters and optical fibers to achieve the distribution and convergence of optical signals. ONT converts optical signals into electrical signals for use by field equipment.

[0029] In this embodiment, the OLT 10 is deployed in the standard Ethernet where the control system 40 is located, and is used to realize the conversion between the standard Ethernet signal of the control system 40 and the PON optical signal of the optical distribution network 20. The optical-electrical signal conversion function of the OLT is integrated in the field switch 30 supporting the Ethernet Advanced Physical Layer (Ethernet-APL) to realize the conversion between the PON optical signal and the APL Ethernet signal, so that the field switch 30 can realize signal transmission with the field device based on APL. The field switch 30 can be understood as a field switch supporting Ethernet advanced physical layer technology. The ODN 20 is used to realize the distribution and convergence of signals between the OLT 10 and the field switch 30. The field device 50 can be understood as a device supporting APL Ethernet, for example, it can be an APL instrument, etc.

[0030] Specifically, in the signal transmission system, the control system 40 is connected to the optical line terminal OLT 10 in the PON based on standard Ethernet to realize standard Ethernet signal transmission between the control system 40 and the OLT 10; the optical line terminal OLT 10 is connected to the optical distribution network ODN 20 through optical fiber to realize optical signal transmission between the optical line terminal OLT 10 and the optical distribution network ODN 20; the optical distribution network ODN 20 is connected to the field switch 30 through optical fiber to realize the distribution and convergence of optical signals between the distribution network ODN 20 and the field switch 30; the field switch 30 is connected to the field device 50 based on APL Ethernet to realize the conversion between the uplink and downlink optical signals of the field switch 30 and the APL Ethernet signals of the field device 50. Through the conversion between standard Ethernet signals, PON optical signals and APL Ethernet signals, the signal transmission between the control system 40 based on standard Ethernet and the field switch 30 based on APL Ethernet is realized.

[0031] In the traditional APL Ethernet solution, the signal transmitted between the field equipment and the control system needs to pass through the path of "field equipment-field switch-power switch-data switch", and the data switch and the power switch may also have multi-layer switching, resulting in multiple topological levels, resulting in high solution costs; and the power switch and the field switch require a large number of cables to connect, further resulting in high costs and high construction difficulties. Therefore, the signal transmission system provided in this embodiment organically integrates the passive optical network PON communication technology, the distributed control system (Distributed Control System, DCS) and APL Ethernet to achieve signal transmission between field equipment and control systems. By merging the power switch and the field switch into a field switch with the function of converting optical signals and electrical signals, and combining the PON communication technology, the topological levels are effectively reduced, and the cables required in the field construction are reduced, which brings great convenience to the construction, reduces the difficulty in construction and effectively reduces the equipment and construction costs.

[0032] The technical solution of the embodiment of the present invention provides a signal transmission system, including an optical line terminal, an optical distribution network and a field switch; the field switch has the function of converting PON optical signals and APL Ethernet signals; wherein the optical line terminal is connected to the control system through standard Ethernet; the optical line terminal is connected to the optical distribution network through optical fiber; the optical distribution network is connected to the field switch through optical fiber, and the field switch is connected to the field equipment based on APL Ethernet. PON communication technology is used and the power switch and field switch in the traditional APL Ethernet solution are merged into a field switch with the function of converting PON optical signals and APL Ethernet signals, realizing the organic integration of passive optical network PON communication technology, distributed control system (Distributed Control System, DCS) and APL Ethernet, effectively reducing the topology level, the number of optical fibers and network cables, and the cables required in on-site construction, thereby effectively reducing the equipment cost and the difficulty and cost of construction.

[0033] As an optional embodiment of the embodiment of the present invention, during the downlink signal transmission process, the optical line terminal 10 converts the downlink standard Ethernet signal sent by the control system 40 into a downlink PON optical signal, and transmits the downlink PON optical signal to the optical distribution network 20 through the optical fiber;

[0034] The optical distribution network 20 distributes the received downstream PON optical signal to the field switch 30 via optical fiber;

[0035] The field switch 30 converts the received downstream PON optical signal into a downstream APL Ethernet signal, and sends the downstream APL Ethernet signal to the field device 50 .

[0036] Among them, the downstream standard Ethernet signal can be understood as a signal based on the standard Ethernet downstream transmission. The downstream PON optical signal can be understood as an optical signal based on the PON downstream transmission. The downstream APL Ethernet signal can be understood as a signal based on the APL Ethernet downstream transmission. The downstream signal transmission process can be understood as the process of transmitting the signal from the control system to the field device.

[0037] Specifically, during the transmission of the downstream signal, the control system 40 sends a downstream standard Ethernet signal to the OLT 10, and the OLT 10 converts the downstream standard Ethernet signal into a downstream PON optical signal, and distributes the downstream PON optical signal to the corresponding field switch 30 through the optical fiber between the OLT 10 and the ODN 20. The field switch 30 converts the downstream PON optical signal into a downstream APL Ethernet signal, and sends the downstream APL Ethernet signal to the field device 50 based on the APL port, so that the control system 40 controls the field device 50.

[0038] In the process of downlink signal transmission, this embodiment uses PON communication technology and merges the power switch and the field switch. The downlink control signal transmitted between the control system and the field equipment only needs to pass through the "optical line terminal-optical distribution network-field switch" path, which effectively reduces the topology level, the number of optical fibers and network cables, and effectively reduces the equipment cost as well as the difficulty and cost of construction.

[0039] As an optional embodiment of the embodiment of the present invention, during the uplink signal transmission process, the field switch converts the uplink APL Ethernet signal sent by the field device into an uplink PON optical signal, and sends the uplink PON optical signal to the optical distribution network through the optical fiber;

[0040] The optical distribution network sends the received uplink PON optical signal to the optical line terminal via an optical fiber;

[0041] The optical line terminal converts the upstream PON optical signal into an upstream standard Ethernet signal, and returns the upstream standard Ethernet signal to the control system.

[0042] Among them, the uplink standard Ethernet signal can be understood as a signal based on the uplink transmission of the standard Ethernet. The uplink PON optical signal can be understood as an optical signal based on the uplink transmission of the PON. The uplink APL Ethernet signal can be understood as a signal based on the uplink transmission of the APL Ethernet. The uplink signal transmission process can be understood as the process of transmitting the signal from the field device to the control system.

[0043] Specifically, during the uplink signal transmission process, the field device 50 sends the uplink APL Ethernet signal to the APL port of the field switch 30, the field switch 30 converts the uplink APL Ethernet signal into an uplink PON optical signal, and aggregates the uplink PON optical signal to the ODN 20 based on the optical fiber, the ODN 20 sends the uplink PON optical signal to the OLT 10 through the optical fiber between the OLT 10 and the ODN 20, and the OLT 10 converts the uplink PON optical signal into an uplink standard Ethernet signal; the OLT 10 transmits the uplink standard Ethernet signal to the control system 40 based on the standard Ethernet, thereby realizing the signal transmission from the field device 50 to the control system 40.

[0044] In the process of uplink signal transmission, this embodiment uses PON communication technology and merges the power switch and the field switch. The uplink control signal transmitted between the field equipment and the control system only needs to pass through the "field switch-optical distribution network-optical line terminal" path, which effectively reduces the topology level, the number of optical fibers and network cables, and effectively reduces the equipment cost as well as the difficulty and cost of construction.

[0045] Embodiment 2

[0046] Figure 3 This is a schematic diagram of the structure of a field switch provided by the second embodiment of the present invention. This embodiment can be applied to the signal transmission system described in the above embodiment to realize the conversion between PON optical signal and APL Ethernet signal. The field switch is deployed in the signal transmission system described in the first embodiment of the present invention.

[0047] like Figure 3 As shown, the field switch 30 includes: an optical module 31, a PON chip 32, a switching chip 33, an APL physical layer module 34, a power management module 35 and a processor 36; wherein the power management module 35 is respectively connected to the optical module 31, the PON chip 32, and the switching chip 33; the processor 36 is respectively connected to the PON chip 32, the switching chip 33 and the APL physical layer module 34; the optical module 31 is connected to the optical distribution network 20 in the signal transmission system through an optical fiber, and the optical module 31, the PON chip 32, the switching chip 33 and the APL physical layer module 34 are connected in sequence; the APL physical layer module 34 is connected to the field device 50 in the signal transmission system;

[0048] The optical module 31 is used for converting PON optical signals and PON electrical signals; the PON chip 32 is used for converting the PON electrical signals and standard Ethernet signals; the switching chip 33 is used for receiving, processing and forwarding the standard Ethernet signals; the APL physical layer module 34 is used for realizing the conversion between the standard Ethernet signals and the APL Ethernet signals; the power management module 35 is used for providing power to the optical module 31, the PON chip 32 and the switching chip 33 based on an auxiliary power supply; the processor 36 is used for managing and configuring the PON chip 32, the switching chip 33 and the APL physical layer module 34.

[0049] The APL physical layer module 34 may include one or more APL physical layer units. The PON chip (Passive Optical Network Media Access Control, PON MAC) is used to implement the adaptation of the Ethernet protocol and the PON protocol.

[0050] Specifically, the power management module 35 converts the input auxiliary power into module power to supply power to each module in the field switch 30, and the processor 36 manages and configures each module in the field switch 30. The field switch 30 is connected to the optical distribution network 20 in the signal transmission system through the optical module 31 based on optical fiber, and is used to transmit optical signals between the optical distribution network 20 through optical fiber, and realize the conversion between optical signals and electrical signals based on PON. Inside the field switch 30, the optical module 31, the PON chip (PON MAC) 32, the switching chip 33 and the APL physical layer module 34 are connected in sequence; the PON chip 32 is used to realize the conversion between PON electrical signals and standard Ethernet signals; the switching chip 33 is used to realize the reception, processing and forwarding of standard Ethernet signals, and the APL physical layer module 34 is used to realize the conversion between standard Ethernet signals and APL Ethernet signals, so that communication with field devices can be carried out based on APL Ethernet.

[0051] In the traditional APL Ethernet solution, the signal between the field device and the control system needs to pass through the path of "field device-field switch-power switch-data switch". Since the number of ports of the field switch is limited and the ports of the field switch are connected to the field devices in a point-to-point manner, there are many field switches, which leads to a large number of Trunk lines connected between the field switch and the power switch. In addition, due to the space limitation between the power switch and the field switch, the length of the connected Trunk line is large, which leads to high engineering difficulty, cost, and safety risks. The field switch supporting APL Ethernet provided in this embodiment organically integrates the passive optical network PON communication technology with APL Ethernet, merges the functions of the power switch and the field switch in the traditional APL Ethernet solution, and realizes the conversion function of PON optical signal and APL Ethernet signal. Since the ODN in the PON supports splitting ratios such as 1:64 / 1:128, it can greatly reduce the number of optical fibers connected to the field switch, and effectively reduce the topology level, reducing the cost of the field switch and the difficulty and cost of construction.

[0052] In an optional embodiment, the APL physical layer module includes: at least one APL physical layer chip, and each of the APL physical layer chips is connected to a field device respectively.

[0053] Specifically, the APL physical layer module includes one or more APL physical layer chips, each APL physical layer chip is connected to an APL port, and each APL port can be connected to a field device.

[0054] The embodiment of the present invention provides a field switch, which is deployed in the signal transmission system provided by the embodiment of the present invention, and the field switch includes: an optical module, a PON chip, a switching chip, a power management module, an APL physical layer module and a processor; wherein the power management module is respectively connected to the optical module, the PON chip and the switching chip; the processor is respectively connected to the PON chip, the switching chip and the APL physical layer module; the optical module is connected to the optical distribution network in the signal transmission system through an optical fiber, and the optical module, the PON chip, the switching chip and the APL physical layer module are connected in sequence; the APL physical layer module is connected to the field equipment in the signal transmission system. The field switch combines the power switch and the field switch in the traditional solution, and integrates the photoelectric signal conversion function of the ONT, which can realize the conversion function of the PON optical signal and the APL Ethernet signal during the signal transmission process, and can provide a basis for the organic integration of the passive optical network PON communication technology, the distributed control system (DCS) and the APL Ethernet, effectively reducing the topological level, the number of optical fibers and network cables, and the cables required in the field construction, thereby effectively reducing the equipment cost and the construction difficulty and cost.

[0055] As an optional embodiment of the embodiment of the present invention, during the transmission of the downlink signal, the optical module converts the downlink PON optical signal sent by the optical distribution network into a downlink PON electrical signal;

[0056] The PON chip converts the downstream PON electrical signal into a downstream standard Ethernet signal;

[0057] The APL physical layer module is used to convert the downlink standard Ethernet signal into a downlink APL Ethernet signal.

[0058] The downstream PON electrical signal can be understood as an electrical signal based on PON downstream transmission, and the downstream standard Ethernet signal can be understood as a signal based on standard Ethernet downstream transmission.

[0059] Specifically, during the transmission of downlink signals from the control system to the field equipment, the downlink standard Ethernet signal sent by the control system is converted into a downlink PON optical signal through the optical line terminal 10 and the optical distribution network 20, and the optical module 31 in the field switch 30 converts the downlink PON optical signal sent by the optical distribution network into a downlink PON electrical signal, thereby realizing the photoelectric conversion of the PON in the downlink transmission direction. The optical module 31 transmits the downlink PON electrical signal to the PON chip 32 based on the PON link, and the PON chip 32 converts the downlink PON electrical signal into a downlink standard Ethernet signal, thereby realizing the conversion between the PON signal and the standard Ethernet signal in the downlink transmission direction, and sends the downlink APL Ethernet signal to the switching chip 33, and the switching chip 33 transmits the downlink standard Ethernet signal to the APL physical layer module 34; the APL physical layer module 34 converts the downlink standard Ethernet signal into a downlink APL Ethernet signal, thereby realizing the conversion between the standard Ethernet signal and the APL Ethernet signal in the downlink transmission direction, thereby being able to transmit the APL Ethernet signal to the field equipment 50 through the APL port.

[0060] This embodiment combines the power switch and the field switch in the traditional solution into a field switch with the function of converting optical signals and electrical signals during the downstream signal transmission process, thereby realizing the conversion of downstream PON optical signal-downstream PON electrical signal-downstream standard Ethernet signal-downstream APL Ethernet signal, which can greatly reduce the number of optical fibers connecting the power switch and the field switch in the traditional solution, effectively reduce the topology level, and reduce the cost of the field switch as well as the difficulty and cost of construction.

[0061] As an optional embodiment of the embodiment of the present invention, during the uplink signal transmission process, the APL physical layer module is used to convert the uplink APL Ethernet signal sent by the field device into an uplink standard Ethernet signal;

[0062] The PON chip converts the upstream standard Ethernet signal into an upstream PON electrical signal;

[0063] The optical module converts the upstream PON electrical signal into an upstream PON optical signal.

[0064] The upstream PON electrical signal can be understood as an electrical signal based on PON upstream transmission, and the upstream standard Ethernet signal can be understood as a signal based on standard Ethernet upstream transmission.

[0065] Specifically, during the uplink signal transmission process from the field device to the control system, the field switch 30 converts the uplink APL Ethernet signal sent by the field device 50 into an uplink standard Ethernet signal through the APL physical layer module 34, and transmits the uplink standard Ethernet signal to the switching chip 33; the switching chip 33 transmits the uplink standard Ethernet signal to the PON chip 32; the PON chip 32 converts the uplink standard Ethernet signal into an uplink PON electrical signal, and transmits the uplink PON electrical signal to the optical module 31 based on the PON link; the optical module 31 converts the uplink PON electrical signal into an uplink PON optical signal, thereby realizing the photoelectric conversion of the PON in the uplink transmission direction.

[0066] This embodiment combines the power switch and the field switch in the traditional solution into a field switch with the function of converting optical signals and electrical signals during the uplink signal transmission process, thereby realizing the conversion of uplink APL Ethernet signal-uplink standard Ethernet signal-uplink PON electrical signal-uplink PON optical signal, which can greatly reduce the number of optical fibers connecting the power switch and the field switch in the traditional solution, effectively reduce the topology level, and reduce the cost of the field switch as well as the difficulty and cost of construction.

[0067] As an optional embodiment of the embodiment of the present invention, the power management module 35 is further configured to supply power to the field device connected to the APL physical layer module based on an auxiliary power supply.

[0068] Specifically, the power management module 35 processes the auxiliary power supply, converts it into external power, and supplies power to the field equipment connected to the APL physical layer module, ensuring that the APL power supplies of various channels do not interfere with each other.

[0069] In addition, the field switch 30 further includes a data storage module for storing the photoelectric conversion data of the PON.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0071] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A signal transmission system, characterized in that: include: Optical line terminal, optical distribution network and field switch supporting APL Ethernet; the field switch has the function of converting PON optical signal and APL Ethernet signal; Wherein, the optical line terminal is connected to the control system via standard Ethernet; the optical line terminal is connected to the optical distribution network via optical fiber; the optical distribution network is connected to the field switch via optical fiber, and the field switch is connected to the field equipment based on APL Ethernet.

2. The system according to claim 1, characterized in that During the downlink signal transmission process, the optical line terminal converts the downlink standard Ethernet signal sent by the control system into a downlink PON optical signal, and transmits the downlink PON optical signal to the optical distribution network through the optical fiber; The optical distribution network distributes the received downstream PON optical signal to the field switch via optical fiber; The field switch converts the received downstream PON optical signal into a downstream APL Ethernet signal, and sends the downstream APL Ethernet signal to the field device.

3. The system according to claim 1, characterized in that During the uplink signal transmission process, the field switch converts the uplink APL Ethernet signal sent by the field device into an uplink PON optical signal, and sends the uplink PON optical signal to the optical distribution network through the optical fiber; The optical distribution network sends the received uplink PON optical signal to the optical line terminal via an optical fiber; The optical line terminal converts the upstream PON optical signal into an upstream standard Ethernet signal, and returns the upstream standard Ethernet signal to the control system.

4. A field switch, characterized in that: Deployed in the signal transmission system of claim 1, the field switch comprises: an optical module, a PON chip, a switching chip, a power management module, an APL physical layer module and a processor; Among them, the power management module is respectively connected to the optical module, the PON chip, and the switching chip; the processor is respectively connected to the PON chip, the switching chip and the APL physical layer module; the optical module is connected to the optical distribution network in the signal transmission system through an optical fiber, and the optical module, the PON chip, the switching chip and the APL physical layer module are connected in sequence; the APL physical layer module is connected to the field equipment in the signal transmission system.

5. The field switch according to claim 4, characterized in that: The optical module is used for conversion of PON optical signals and PON electrical signals; The PON chip is used for converting the PON electrical signal and the standard Ethernet signal; The switching chip is used to receive, process and forward the standard Ethernet signal; The APL physical layer module is used to realize the conversion between the standard Ethernet signal and the APL Ethernet signal; The power management module is used to provide power to the optical module, the PON chip and the switching chip based on an auxiliary power supply; The processor is used for the management and configuration of the PON chip, the switching chip and the APL physical layer module.

6. The field switch according to claim 5, characterized in that: During the transmission of the downlink signal, the optical module converts the downlink PON optical signal sent by the optical distribution network into a downlink PON electrical signal; The PON chip converts the downstream PON electrical signal into a downstream standard Ethernet signal; The switching chip transmits the downlink standard Ethernet signal to the APL physical layer module; The APL physical layer module is used to convert the downlink standard Ethernet signal into a downlink APL Ethernet signal.

7. The field switch according to claim 5, characterized in that: During the uplink signal transmission process, the APL physical layer module is used to convert the uplink APL Ethernet signal sent by the field device into an uplink standard Ethernet signal; The PON chip converts the upstream standard Ethernet signal into an upstream PON electrical signal; The optical module converts the upstream PON electrical signal into an upstream PON optical signal.

8. The field switch according to claim 4, characterized in that: The power management module is further configured to supply power to the field device connected to the APL physical layer module based on an auxiliary power supply.

9. The field switch according to any one of claims 4 to 8, characterized in that: The APL physical layer module includes: at least one APL physical layer chip, and each of the APL physical layer chips is connected to a field device respectively.

10. The field switch according to any one of claims 4 to 8, characterized in that: The APL physical layer module is connected to the field device in the signal transmission system through an APL port.

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