Passive aggregation layer network device, network system and method of operation thereof

Abstract

The present invention provides a passive aggregation layer network device, a network system and its operating method. The passive aggregation layer network device includes a first multiplexer / demultiplexer, a second multiplexer / demultiplexer and an optical fiber, the first multiplexer / demultiplexer receives optical signals of optical modules of each access layer network device connected thereto, couples the received optical signals to obtain a first coupled optical signal, and transmits the first coupled optical signal to the second multiplexer / demultiplexer via the optical fiber, and the second multiplexer / demultiplexer decouples the first coupled optical signal and transmits the obtained optical signals to the optical modules of the corresponding core layer network device. Since the aggregation layer network device is a passive network device, it does not need to be stored in a dedicated low-voltage room by itself, and can be used even when there is no low-voltage room or the environment of the low-voltage room is poor, greatly improving the applicability of the network system.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application bearing application number 202210331892.8 and title "Passive aggregation layer network equipment, network system" filed with the China Patent Office on March 30, 2022, and to a Chinese patent application bearing application number 202210777625.3 and title "Passive aggregation layer network equipment, network system and operation method thereof" filed with the China Patent Office on July 4, 2022, the entire contents of which are incorporated by reference into this application.

[0002] [Technical field] Books application The present invention relates to the field of communications technology, and more particularly to a passive aggregation layer network device, a network system and an operating method thereof. [Background technology]

[0003] In the networking mode of the traditional three-layer network, the three-layer network includes a core layer, an aggregation layer, and an access layer. Each network device in the access layer is called an access layer network device, each network device in the aggregation layer is called an aggregation layer network device, and each network device in the core layer is called a core layer network device, among which the access layer network device, the aggregation layer network device, and the core layer network device are all active network devices. For a complex including one or more buildings, such as a school, a hospital, an enterprise, or a government agency, the core layer network device is generally deployed in the data center of the complex, the aggregation layer network device is generally deployed in the low-voltage room of each building of the complex, and the access layer network device is generally deployed in the low-voltage room of each building of the complex and the low-voltage room on each floor.

[0004] When adopting the traditional three-layer network for networking, this networking mode has good performance, clear hierarchical structure, and intuitive and convenient for network management, so it is widely applied in practice. However, the traditional three-layer network networking mode also has the following shortcomings, for example: (1) The aggregation layer network equipment is an active network equipment and is installed in a low-voltage room, so it is necessary to install equipment such as an uninterruptible power supply (abbreviated as UPS) and air conditioning in the low-voltage room to maintain the normal operation of the low-voltage room, which makes the operation and maintenance management of the low-voltage room complicated and increases the operation cost. When the aggregation layer network equipment is an active network equipment, the requirements for the low-voltage room are high, and if there is no low-voltage room or the environment of the low-voltage room is poor, it cannot be deployed, and the applicability is poor. (2) The access layer network equipment in the low-voltage room on each floor is connected to the terminal network equipment in each room using copper wire, which needs to be configured in advance, so the cost is high and it is difficult to add a new spot later, and the scalability is poor. Summary of the Invention [Means for solving the problem]

[0005] In order to solve the above problems, the present application provides a passive aggregation layer network device, the passive aggregation layer network device including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and an optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, the first multiplexer / demultiplexer including a set number of optical interfaces, each optical interface of the first multiplexer / demultiplexer being connected to an optical module of one access layer network device, and the second multiplexer / demultiplexer including a set number of optical interfaces connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer to an optical module of one access layer network device, a number of optical interfaces, each of the optical interfaces of the second multiplexer / demultiplexer being connected to an optical module of one core layer network equipment; the first multiplexer / demultiplexer receiving optical signals of the optical modules of each of the access layer network equipment connected thereto, coupling the received optical signals to obtain a first coupled optical signal, and transmitting the first coupled optical signal to the second multiplexer / demultiplexer through the optical fiber; the second multiplexer / demultiplexer decouples the first coupled optical signal, and transmits the obtained optical signals to the optical modules of the corresponding core layer network equipment. do.

[0006] The passive aggregation layer network equipment in this application has the following advantages: (1) The aggregation layer network equipment is a passive network equipment, and does not need to be stored in a dedicated low-voltage room by itself, eliminating the need to install equipment such as UPS and air conditioning, thereby reducing the operation and maintenance costs of the low-voltage room; (2) Because the aggregation layer network equipment is a passive network equipment, the requirements for a low-voltage room are greatly reduced, and it can be used even when there is no low-voltage room or the environment of the low-voltage room is poor, greatly expanding the scope of application, thereby greatly improving the adaptability of the passive aggregation layer network equipment.

[0007] In one possible implementation, the second multiplexer / demultiplexer receives optical signals from the optical modules of each core layer network equipment connected thereto, couples the received optical signals to obtain a second coupled optical signal, and transmits the second coupled optical signal to the first multiplexer / demultiplexer via the optical fiber, which decouples the second coupled optical signal and transmits the obtained optical signals to the optical modules of the corresponding access layer network equipment.

[0008] In one possible implementation, the optical modules of each access layer network device and the optical modules of each core layer network device each have one transmitting central wavelength and one receiving central wavelength, the transmitting central wavelength and the receiving central wavelength of the optical modules of the same access layer network device are different, and the transmitting central wavelength and the receiving central wavelength of the optical modules of the same core layer network device are different.

[0009] In one possible implementation, the transmitting central wavelength of the optical module of each access layer network device is different from the transmitting central wavelength of the optical module of the other access layer network devices, and the receiving central wavelength of the optical module of each access layer network device is different from the receiving central wavelength of the optical module of the other access layer network devices.

[0010] In one possible implementation, the transmitting central wavelength of the optical module of each core layer network device is different from the transmitting central wavelength of the optical module of the other core layer network devices, and the receiving central wavelength of the optical module of each core layer network device is different from the receiving central wavelength of the optical module of the other core layer network devices.

[0011] In one possible implementation, the transmitting central wavelength and the receiving central wavelength of an optical module of each access layer network device correspond to the receiving central wavelength and the transmitting central wavelength of an optical module of one core layer network device, respectively.

[0012] In one possible implementation, when the types of the first multiplexer / demultiplexer and the second multiplexer / demultiplexer are coarse wavelength division multiplexers, the configured number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer is less than or equal to m.

[0013] In one possible implementation, when the types of the first multiplexer / demultiplexer and the second multiplexer / demultiplexer are dense wavelength division multiplexers, the set number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer is less than or equal to n.

[0014] In one possible implementation, the passive aggregation layer network equipment includes a plurality of aggregation modules, the plurality of aggregation modules including a first aggregation module and a second aggregation module, the first aggregation module including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and a first optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the second aggregation module including a third multiplexer / demultiplexer, a fourth multiplexer / demultiplexer, and a second optical fiber connecting the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer.

[0015] In one possible implementation, the configured number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer and the configured number of optical interfaces in the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer are the same or different.

[0016] Another aspect of the present application further provides a network system, the network system including at least one core layer network device, any one of the passive aggregation layer network devices described above, and at least two access layer network devices. nothing.

[0017] The network system of the present application has the following advantages: (1) The access layer network equipment of the present application can be placed in a room and connected to a terminal device, and can be connected to an aggregation layer network equipment via an optical fiber in the room, and new spots can be added at any time later, which is highly scalable. (2) The network system of the present application retains the usage habit that clients only need to operate and maintain Ethernet, and retains the characteristics of Ethernet such as point-to-point, large bandwidth, and low latency, and has low modification costs during actual use, good commercial prospects, and actual application value.

[0018] In one possible implementation, the core layer network equipment and the access layer network equipment include at least one optical module.

[0019] Yet another aspect of the present application further provides a method of operating a passive aggregation layer network equipment, the passive aggregation layer network equipment including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and an optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, the first multiplexer / demultiplexer being connected to some access layer network equipment, the second multiplexer / demultiplexer being connected to some core layer network equipment, and the first multiplexer / demultiplexer being connected to some core layer network equipment. The method for operating the passive aggregation layer network equipment includes the steps of: the first multiplexer / demultiplexer receiving optical signals from optical modules of the access layer network equipment connected thereto, coupling the received optical signals to obtain a first coupled optical signal, and transmitting the first coupled optical signal to a second multiplexer / demultiplexer via an optical fiber; and the second multiplexer / demultiplexer decoupling the first coupled optical signal and transmitting the obtained optical signals to corresponding optical modules of the core layer network equipment. nothing.

[0020] In one possible implementation, the second multiplexer / demultiplexer receives optical signals from the optical modules of each core layer network equipment connected thereto, couples the received optical signals to obtain a second coupled optical signal, and transmits the second coupled optical signal to the first multiplexer / demultiplexer via an optical fiber, which decouples the second coupled optical signal and transmits the obtained optical signals to the optical modules of the corresponding access layer network equipment. Effect of the Invention

[0021] By adopting the operation method of the passive aggregation layer network equipment according to the present application, the transmission of optical signals in a community network network system can be realized by the aggregation layer network equipment. Since the aggregation layer network equipment is passive, compared with active aggregation layer network equipment, the requirements for low-voltage rooms are greatly reduced and the scope of application is greatly expanded, thereby greatly improving the applicability of the passive aggregation layer network equipment. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram showing a network system according to an embodiment of the present application. [Diagram 2] FIG. 2 is a structural diagram of a passive aggregation layer network device in an embodiment of the present application; [Diagram 3] FIG. 2 is a schematic diagram of a wavelength allocation and usage scheme of a first multiplexer / demultiplexer in an embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram of a wavelength allocation and usage scheme of a second multiplexer / demultiplexer in an embodiment of the present application. [Diagram 5] FIG. 2 is a schematic diagram of another wavelength allocation and usage scheme of the first multiplexer / demultiplexer in an embodiment of the present application. [Figure 6] 11 is a schematic diagram of another wavelength allocation and usage scheme of the second multiplexer / demultiplexer in an embodiment of the present application. FIG. [Figure 7] 1 is a schematic diagram of a network system in an embodiment of the present application. [Figure 8] 2 is a flowchart of an uplink signal forwarding method of a passive aggregation layer network device in an embodiment of the present application; [Figure 9] 2 is a flowchart of a downlink signal forwarding method of a passive aggregation layer network device in an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In response to the problem of low adaptability existing in active aggregation layer network equipment, an embodiment of the present application provides a passive aggregation layer network equipment for use in the network system shown in FIG. 1, which includes at least one core layer network equipment 12, at least two access layer network equipment 11, and at least two passive aggregation layer network equipment 13, where the number of core layer network equipment, aggregation layer network equipment and access layer network equipment can be set according to actual needs, and the figure shows a situation including one core layer network equipment, two aggregation layer network equipment and two access layer network equipment, and other possible situations will not be described one by one.

[0024] 2 is a structural diagram of a passive aggregation layer network device according to an embodiment of the present application. The passive aggregation layer network device 13 includes a first multiplexer / demultiplexer 131, a second multiplexer / demultiplexer 132, and an optical fiber 133 connecting the first multiplexer / demultiplexer 131 and the second multiplexer / demultiplexer 132. Here, the first multiplexer / demultiplexer 131 includes a set number of optical interfaces, each optical interface is connected to the access layer network device 11 through an optical module, and the second multiplexer / demultiplexer 132 includes a set number of optical interfaces, each optical interface is connected to the core layer network device 12 through an optical module. It should be noted that the optical modules may be installed inside the access layer network device 11 and the core layer network device 12, or may be separate components, and are not limited here. For ease of description, the following description assumes that optical modules are installed in the access layer network device 11 and the core layer network device 12 by default. Each optical module may set a transmission central wavelength and a reception central wavelength, where the transmission central wavelength and the reception central wavelength are different. Each core layer network device and each access layer network device may install one or more optical modules according to actual needs, and specific optical modules are not shown in FIG. 2.

[0025] The first multiplexer / demultiplexer 131 is used to couple the received optical signals from the optical modules of each access layer network equipment to obtain a first coupled optical signal, and transmit the first coupled optical signal to the second multiplexer / demultiplexer 132 via the optical fiber 133. The second multiplexer / demultiplexer 132 is used to decouple the first coupled optical signal, and transmit the obtained optical signals to the optical modules of the corresponding core layer network equipment, and / or to couple the received optical signals from the optical modules of each core layer network equipment to obtain a second coupled optical signal, and transmit the second coupled optical signal to the first multiplexer / demultiplexer 131 via the optical fiber 133. Meanwhile, the first multiplexer / demultiplexer 131 is further used to decouple the second coupled optical signal, and transmit the obtained optical signals to the corresponding optical modules of each access layer network equipment.

[0026] A passive aggregation layer network device in an embodiment of the present application includes a plurality of aggregation modules, the plurality of aggregation modules including a first aggregation module and a second aggregation module, where the first aggregation module includes a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and a first optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the second aggregation module includes a third multiplexer / demultiplexer, a fourth multiplexer / demultiplexer, and a second optical fiber connecting the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer. By increasing the number of aggregation modules in the passive aggregation layer network equipment, the number of optical modules of the access layer network equipment and the optical modules of the core layer network equipment connected to the passive aggregation layer network equipment can be increased, and the capacity of the aggregation layer network equipment can be increased. In the embodiment of the present application, the number of aggregation modules is not limited, and can be installed according to actual circumstances.

[0027] Specifically, the types of the first multiplexer / demultiplexer and the second multiplexer / demultiplexer may be selected according to actual needs, and may include coarse wavelength-division multiplexing (CWDM), dense wavelength-division multiplexing (DWDM), or multi-wavelength division multiplexing (MWDM). g , MWDM) can be selected, but it is not limited to them. In the following, we will introduce multiplexers / demultiplexers using CWDM and DWDM as examples.

[0028] The first is when the type of the first multiplexer / demultiplexer and the second multiplexer / demultiplexer is selected as CWDM, in which case the set number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer is less than or equal to m, for example, m=9, and the maximum set number of optical interfaces may be adjusted based on technological developments, and is not limited here.

[0029] CWDM can couple and transmit multiple optical signals with different wavelengths spaced 20 nm apart on the same optical fiber. The CWDM structure includes a filter with a central wavelength of λn, and three ports, a common end, a transmission end and a reflection end, where the transmission end is on one side of the filter, and the reflection end and the common end are on the other side, and the filter is highly transparent only to optical signals with wavelengths within λn±6.5 nm, and highly reflective to optical signals with wavelengths in other ranges.

[0030] In the following, we take m=9 as an example, and assume that CWDM has a total of 18 λs, and as shown in Figure 3, the first multiplexer / demultiplexer takes 9 of these λs (λ1 to λ9) and assigns them to 9 optical modules in each access layer network device, and assigns another 9 λs (λ10 to λ18) to 9 optical modules in each core layer network device, and that the first multiplexer / demultiplexer supports an upstream link with a maximum of 1:9 multiplexing.

[0031] CWDM has a total of 18 λ, and as shown in Figure 4, the second multiplexer / demultiplexer takes 9 λ (λ1 to λ9) and assigns them to 9 optical modules of each access layer network device, and assigns another 9 λ (λ10 to λ18) to 9 optical modules of each core layer network device, and assumes that the second multiplexer / demultiplexer supports a maximum 1:9 multiplexing upstream link. Based on this, the matching logic of each wavelength is as shown in Table 1 below. As shown in Table 1, each optical module has one transmitting central wavelength and one receiving central wavelength, and the wavelengths of the transmitting central wavelength and the receiving central wavelength are different. In all the optical modules of the core layer network devices and the optical modules of the access layer network devices connected via the same aggregation module, for each optical module of the access layer network device, there is an optical module of the core layer network device whose receiving central wavelength and transmitting central wavelength correspond to the transmitting central wavelength and receiving central wavelength of the optical module of the access layer network device, that is, the receiving central wavelength of the optical module of the core layer network device corresponds to the transmitting central wavelength of the optical module of the access layer network device, and the transmitting central wavelength of the optical module of the core layer network device corresponds to the receiving central wavelength of the optical module of the access layer network device. In the optical modules of each access layer network device connected via the same aggregation module, the transmitting central wavelength of the optical module of each access layer network device is different from the transmitting central wavelength of the optical module of the other access layer network devices, and the receiving central wavelength of the optical module of each access layer network device is different from the receiving central wavelength of the optical module of the other access layer network devices. Similarly, in the optical modules of each core layer network device connected via the same aggregation module, the transmitting central wavelength of the optical module of each core layer network device is different from the transmitting central wavelength of the optical modules of the other core layer network devices, and the receiving central wavelength of the optical module of each core layer network device is different from the transmitting central wavelength of the optical modules of the other core layer network devices.

[0032] By installing multiple aggregation modules in a passive aggregation layer network device, the number of access layer network devices and core layer network devices connected to the aggregation layer network device can be increased, and the capacity of the aggregation layer can be increased. For aggregation layer network devices having multiple aggregation modules, the following will take two aggregation modules as an example to explain the number of optical interfaces of the multiplexer / demultiplexer in the aggregation module, and the transmission central wavelength and the reception central wavelength of the optical module connected thereto. The aggregation layer network equipment includes a first aggregation module and a second aggregation module, the first aggregation module includes a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and a first optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the second aggregation module includes a third multiplexer / demultiplexer, a fourth multiplexer / demultiplexer, and a second optical fiber connecting the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer. In the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, six optical interfaces are installed, and the numbers of the optical modules of the core layer network equipment connected to the second multiplexer / demultiplexer are C1, C2, C4, C5, C6 and C9 in Table 1, and the numbers of the optical modules of the access layer network equipment connected to the first multiplexer / demultiplexer are A1, A2, A4, A5, A6 and A9 in Table 1. In the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer, five optical interfaces are installed, and the numbers of the optical modules of the core layer network equipment connected to the fourth multiplexer / demultiplexer are C1, C2, C3, C7 and C8 in Table 1, and the numbers of the optical modules of the access layer network equipment connected to the third multiplexer / demultiplexer are A1, A2, A3, A7 and A8 in Table 1.As can be seen from the above embodiments, the number of optical interfaces of the multiplexers / demultiplexers in different aggregation modules may be different, and of course, the number of optical interfaces of the multiplexers / demultiplexers in different aggregation modules may be the same (not illustrated here). The transmission central wavelengths of two optical modules of a core layer network device connected to the multiplexers / demultiplexers in different aggregation modules may be the same or different, and the reception central wavelengths of the two optical modules may be the same or different. The transmission central wavelengths of two optical modules of an access layer network device connected to the multiplexers / demultiplexers in different aggregation modules may be the same or different, and the reception central wavelengths of the two optical modules may be the same or different.

[0033] [Table 1]

[0034] The second is when DWDM is selected as the type of the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, in which case the set number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer is less than or equal to n, for example, n=40, and the maximum set number of optical interfaces may be adjusted based on technological developments.

[0035] DWDM can couple and transmit multiple optical signals with different wavelengths spaced 0.2 nm apart on the same optical fiber. The DWDM structure includes a filter with a central wavelength of λn, and three ports, a common end, a transmission end, and a reflection end. The transmission end is on one side of the filter, and the reflection end and the common end are on the other side. The filter is Especially It is highly transparent to only optical signals within a certain range and highly reflective to optical signals in other ranges of wavelengths.

[0036] Taking n=40 as an example, a mature DWDM has a total of 80 λs, and as shown in Figure 5, the first multiplexer / demultiplexer takes 40 λs (λ1 to λ40) and assigns them to 40 optical modules in each access layer network device, and assigns another 40 λs (λ41 to λ80) to 40 optical modules in each core layer network device, and assumes that the first multiplexer / demultiplexer supports an upstream link with a maximum of 1:40 multiplexing.

[0037] A mature DWDM has a total of 80 λ, and as shown in FIG. 6, the second multiplexer / demultiplexer takes 40 λ (λ1 to λ40) and assigns them to the 40 optical modules of each access layer network device, and assigns another 40 λ (λ41 to λ80) to the 40 optical modules of each core layer network device, and assumes that the second multiplexer / demultiplexer supports a maximum of 1:40 multiplexed upstream link. Based on this, the matching logic of each wavelength is as shown in Table 2 below. As shown in Table 2, each optical module has one transmitting central wavelength and one receiving central wavelength, and the transmitting central wavelength and the receiving central wavelength are different. In all the optical modules of the core layer network devices and the optical modules of the access layer network devices connected through the same aggregation module, for each optical module of the access layer network device, there is one optical module of the core layer network device whose receiving central wavelength and transmitting central wavelength correspond to the transmitting central wavelength and receiving central wavelength of the optical module of the access layer network device. In the optical modules of each access layer network device connected via the same aggregation module, the transmission central wavelength of the optical module of each access layer network device is different from the transmission central wavelength of the optical module of the other access layer network devices, and the reception central wavelength of the optical module of each access layer network device is different from the reception central wavelength of the optical module of the other access layer network devices. Similarly, in the optical modules of each core layer network device connected via the same aggregation module, the transmission central wavelength of the optical module of each core layer network device is different from the transmission central wavelength of the optical module of the other core layer network devices, and the reception central wavelength of the optical module of each core layer network device is different from the transmission central wavelength of the optical module of the other core layer network devices.

[0038] By installing multiple aggregation modules in a passive aggregation layer network device, the number of access layer network devices and core layer network devices connected to the aggregation layer network device can be increased, and the capacity of the aggregation layer can be increased. For aggregation layer network devices having multiple aggregation modules, the following will take two aggregation modules as an example to explain the number of optical interfaces of the multiplexer / demultiplexer in the aggregation module, and the transmission central wavelength and the reception central wavelength of the optical module connected thereto. The aggregation layer network equipment includes a first aggregation module and a second aggregation module, the first aggregation module includes a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and a first optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the second aggregation module includes a third multiplexer / demultiplexer, a fourth multiplexer / demultiplexer, and a second optical fiber connecting the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer. In the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, six optical interfaces are installed, and the numbers of the optical modules of the core layer network equipment connected to the second multiplexer / demultiplexer are C1, C2, C4, C5, C6 and C9 in Table 2, and the numbers of the optical modules of the access layer network equipment connected to the first multiplexer / demultiplexer are A1, A2, A4, A5, A6 and A9 in Table 2. In the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer, five optical interfaces are installed, and the numbers of the optical modules of the core layer network equipment connected to the fourth multiplexer / demultiplexer are C1, C2, C3, C7 and C8 in Table 2, and the numbers of the optical modules of the access layer network equipment connected to the third multiplexer / demultiplexer are A1, A2, A3, A7 and A8 in Table 2.As can be seen from the above embodiments, the number of optical interfaces of the multiplexers / demultiplexers in different aggregation modules may be different, and of course, the number of optical interfaces of the multiplexers / demultiplexers in different aggregation modules may be the same (not illustrated here). The transmission central wavelengths of two optical modules of a core layer network device connected to the multiplexers / demultiplexers in different aggregation modules may be the same or different, and the reception central wavelengths of the two optical modules may be the same or different. The transmission central wavelengths of two optical modules of an access layer network device connected to the multiplexers / demultiplexers in different aggregation modules may be the same or different, and the reception central wavelengths of the two optical modules may be the same or different.

[0039] [Table 2]

[0040] 7 is a schematic diagram of a network system in an embodiment of the present application, which includes nine optical modules in an access layer network device, one aggregation module in a passive network aggregation layer, and nine optical modules in a core layer network device. The aggregation module includes a first multiplexer / demultiplexer, an optical fiber, and a second multiplexer / demultiplexer, in which in this embodiment, nine optical interfaces are provided in the first multiplexer / demultiplexer, which is used to connect with the optical module of the access layer network equipment, and another optical interface is provided to connect with the optical fiber, and further realizes the connection with the second multiplexer / demultiplexer; nine optical interfaces are provided in the second multiplexer / demultiplexer, which is used to connect with the optical module of the core layer network equipment, and another optical interface is provided to connect with the optical fiber, and further realizes the connection with the first multiplexer / demultiplexer. FIG. 7 is merely an illustrative example of one embodiment of a network system including a passive network aggregation layer, and does not limit the number of optical modules in the core layer network equipment and the optical modules in the access layer network equipment, nor does it limit the number of optical interfaces in the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the above numbers may all be adjusted and set according to actual needs.

[0041] In Fig. 7, according to the wavelength allocation rules of the optical modules in Tables 1 and 2, each optical module has one transmitting central wavelength and one receiving central wavelength, and the transmitting central wavelength and the receiving central wavelength are different from each other. In the network system shown in Fig. 7, As an example One aggregation module Le Have Shows an exampleTherefore, for an optical module of an access layer network device, there is only one corresponding optical module of a core layer network device, that is, the transmission central wavelength and the reception central wavelength of the optical module of the access layer network device are the same as the reception central wavelength and the transmission central wavelength of the optical module of the core layer network device. For example, for an optical module 1 of an access layer network device, there is only one corresponding optical module of a core layer network device, and assuming that it is the optical module 1 of the core layer network device, the transmission central wavelength of the optical module 1 of the access layer network device is the same as the reception central wavelength of the optical module 1 of the core layer network device, and the reception central wavelength of the optical module 1 of the access layer network device is the same as the transmission central wavelength of the optical module 1 of the core layer network device. The transmission central wavelength of the optical module of each access layer network device is different from the transmission central wavelength of the optical module of the other access layer network devices, and the reception central wavelength of the optical module of each access layer network device is different from the reception central wavelength of the optical module of the other access layer network devices. Similarly, in the optical modules of each core layer network device connected via the same aggregation module, the transmission central wavelength of the optical module of each core layer network device is different from the transmission central wavelength of the optical module of the other core layer network devices, and the reception central wavelength of the optical module of each core layer network device is different from the transmission central wavelength of the optical module of the other core layer network devices. The optical module of each access layer network device is connected to one access layer network device, and the same access layer network device may be connected to the optical modules of multiple access layer network devices, or the optical modules of multiple access layer network devices may be installed in the same access layer network device. The optical module of each core layer network device is connected to one core layer network device, and the same core layer network device may be connected to the optical modules of multiple core layer network devices, or the optical modules of multiple core layer network devices may be installed in the same core layer network device.

[0042] In the network system configured by adopting the passive aggregation layer network equipment according to the embodiment of the present application, the core layer network equipment 12 is still arranged in the data center of the housing complex, the passive aggregation layer network equipment 13 may be installed in the low-current room of the building or floor, and the access layer network equipment 11 may be directly arranged indoors, for example, in a classroom, an office, etc. The access layer network equipment 11 accesses the passive aggregation layer network equipment 13 via an indoor optical fiber coated cable, and the passive aggregation layer network equipment 13 arranged in the building or floor is connected to the core layer network equipment 12 via an outdoor optical fiber cable. Therefore, by installing the passive aggregation layer network equipment 13, the usage of trunk optical fiber (i.e., outdoor optical fiber) is greatly reduced, wiring is simplified, modification difficulty is reduced, and labor costs for deployment are reduced, compared with removing the aggregation layer network equipment 13 and directly connecting the access layer network equipment 11 and the core layer network equipment 12. Therefore, the adoption of the network system according to the embodiment of the present application still maintains the network architecture design that many networks in the market have only one Ethernet, and retains the user habit that clients only need to operate and maintain Ethernet, while retaining the characteristics of Ethernet such as point-to-point, large bandwidth, and low latency, and in actual use, the modification cost is lower, the market acceptance is high, and it has good commercial prospects and actual application value.

[0043] In the passive aggregation layer network equipment according to the embodiment of the present application, the passive aggregation layer network equipment includes a first multiplexer / demultiplexer 131, a second multiplexer / demultiplexer 132, and an optical fiber 133 connecting the first multiplexer / demultiplexer 131 and the second multiplexer / demultiplexer 132, all of which are passive devices, so the aggregation layer network equipment 13 is passive. The adoption of the networking system according to the embodiment of the present application has the following advantages: (1) Since the aggregation layer network equipment is a passive network equipment and does not need to be stored alone in a dedicated low-voltage room, there is no need to install equipment such as a UPS or air conditioner, which reduces the operation and maintenance costs of the low-voltage room. (2) Because the aggregation layer network equipment is a passive network equipment, the requirement for a low-voltage room is greatly reduced, and it can be used even when there is no low-voltage room or the environment of the low-voltage room is poor, greatly expanding the scope of application, thereby greatly improving the adaptability of passive aggregation layer network equipment. (3) The access layer network equipment can be placed in the room and connected to the terminal equipment, and can be connected to the aggregation layer network equipment via the optical fiber in the room, and new spots can be added at any time later, with high scalability. (4) The network system retains the usage habit that the client only needs to operate and maintain Ethernet, while retaining the characteristics of Ethernet such as point-to-point, large bandwidth, and low latency, and has low modification costs during actual use, good commercial prospects, and actual application value.

[0044] The above introduces the structure of the passive aggregation layer network equipment. Below, the operation method of the network system in FIG. 7 will be introduced. The main operation of the network system includes forwarding uplink optical signals and forwarding downlink optical signals.

[0045] Referring to Fig. 8, Fig. 8 is a flow chart of a method for forwarding an uplink optical signal. When forwarding an uplink optical signal, the method includes step S81 in which an optical module of each access layer network device transmits an optical signal to a first multiplexer / demultiplexer, step S82 in which the first multiplexer / demultiplexer couples each received optical signal to obtain a first coupled optical signal, and transmits the first coupled optical signal to a second multiplexer / demultiplexer via an optical fiber, and step S83 in which the second multiplexer / demultiplexer decouples the first coupled optical signal, and transmits each obtained optical signal to a corresponding optical module of a core layer network device.

[0046] Referring to Fig. 9, Fig. 9 is a flow chart of a method for forwarding a downlink optical signal. When forwarding a downlink optical signal, the method includes step S91 in which an optical module of each core layer network device transmits an optical signal to a second multiplexer / demultiplexer, step S92 in which the second multiplexer / demultiplexer couples each received optical signal to obtain a second coupled optical signal, and transmits the second coupled optical signal to a first multiplexer / demultiplexer via an optical fiber, and step S93 in which the first multiplexer / demultiplexer decouples the second coupled optical signal, and transmits each obtained optical signal to an optical module of a corresponding access layer network device.

[0047] By using the above-mentioned uplink optical signal transmission method and downlink optical signal transmission method, the transmission of optical signals in the community network network system shown in Figure 1 can be realized. Since the aggregation layer network equipment is passive, compared with active aggregation layer network equipment, the requirements for low-voltage rooms are greatly reduced and the application range is greatly expanded, thereby greatly improving the applicability of passive aggregation layer network equipment.

[0048] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to generate a machine. The instructions executed by the processor of the computer or other programmable data processing device thereby generate an apparatus for implementing the functions specified in a flow or flows in the flowcharts and / or in a block or blocks in the block diagrams.

[0049] These computer program instructions may be stored in a computer readable memory that can cause a computer or other programmable data processing device to operate in a particular manner such that the instructions stored in the computer readable memory produce an article of manufacture that includes an instruction apparatus that implements the functions specified in a flow or flows in the flowcharts and / or in a block or blocks in the block diagrams.

[0050] These computer program instructions may be installed on a computer or other programmable data processing device to cause the computer or other programmable device to execute a series of operational steps to generate a computer-implemented process, whereby the instructions executing on the computer or other programmable device provide steps for implementing the functions specified in a flow or flows in the flowcharts and / or in a block or blocks in the block diagrams.

[0051] Although alternative embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have acquired the basic creative concept, and it is therefore intended that the appended claims be interpreted as including the alternative embodiments and all such changes and modifications that fall within the scope of the present invention.

[0052] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and its equivalents, the present invention intends to include these modifications and variations.

Claims

1. a passive aggregation layer network device, the passive aggregation layer network device including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and an optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer; the first multiplexer / demultiplexer includes a set number of optical interfaces, each optical interface of the first multiplexer / demultiplexer being connected to an optical module of one of the access layer network devices; the second multiplexer / demultiplexer includes the set number of optical interfaces, and each optical interface of the second multiplexer / demultiplexer is connected to an optical module of one core layer network device; the first multiplexer / demultiplexer receives optical signals from optical modules of a plurality of access layer network devices connected thereto, couples the received optical signals to obtain a first coupled optical signal, and transmits the first coupled optical signal to a second multiplexer / demultiplexer via the optical fiber; The passive aggregation layer network equipment, characterized in that the second multiplexer / demultiplexer decouples the first coupled optical signal and transmits the resulting multiple optical signals to corresponding optical modules of the core layer network equipment.

2. the second multiplexer / demultiplexer receives optical signals from optical modules of a plurality of core layer network devices connected thereto, couples the received optical signals to obtain a second coupled optical signal, and transmits the second coupled optical signal to the first multiplexer / demultiplexer via the optical fiber; 2. The passive aggregation layer network equipment of claim 1, wherein the first multiplexer / demultiplexer decouples the second coupled optical signal and transmits the resulting multiple optical signals to corresponding optical modules of access layer network equipment.

3. The passive aggregation layer network equipment according to claim 1, characterized in that the optical module of the access layer network equipment and the optical module of the core layer network equipment each have one transmitting central wavelength and one receiving central wavelength, the transmitting central wavelength and the receiving central wavelength of the optical module of the same access layer network equipment are different, and the transmitting central wavelength and the receiving central wavelength of the optical module of the same core layer network equipment are different.

4. 4. The passive aggregation layer network device of claim 3, wherein the transmitting central wavelength of an optical module of each of the access layer network devices is different from the transmitting central wavelength of an optical module of the other of the access layer network devices, and the receiving central wavelength of an optical module of each of the access layer network devices is different from the receiving central wavelength of an optical module of the other of the access layer network devices.

5. A passive aggregation layer network device as described in claim 3, characterized in that the transmitting central wavelength of an optical module of each of the core layer network devices is different from the transmitting central wavelength of an optical module of the other core layer network devices, and the receiving central wavelength of an optical module of each of the core layer network devices is different from the receiving central wavelength of an optical module of the other core layer network devices.

6. A passive aggregation layer network device as described in any one of claims 1 to 5, characterized in that the transmitting central wavelength and the receiving central wavelength of an optical module of one of the access layer network devices respectively correspond to the receiving central wavelength and the transmitting central wavelength of an optical module of one of the core layer network devices.

7. A passive aggregation layer network equipment according to any one of claims 1 to 5, characterized in that the first multiplexer / demultiplexer and the second multiplexer / demultiplexer are of a type of coarse wavelength division multiplexer, or the first multiplexer / demultiplexer and the second multiplexer / demultiplexer are of a type of dense wavelength division multiplexer.

8. 6. The passive aggregation layer network equipment according to claim 1, wherein the passive aggregation layer network equipment includes a plurality of aggregation modules, the plurality of aggregation modules including a first aggregation module and a second aggregation module, the first aggregation module including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and a first optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, and the second aggregation module including a third multiplexer / demultiplexer, a fourth multiplexer / demultiplexer, and a second optical fiber connecting the third multiplexer / demultiplexer and the fourth multiplexer / demultiplexer.

9. A network system, comprising at least one core layer network device, at least one passive aggregation layer network device according to any one of claims 1 to 8, and at least two access layer network devices.

10. 10. The network system according to claim 9, wherein the core layer network equipment and the access layer network equipment each include at least one optical module.

11. A method for operating a passive aggregation layer network equipment, the passive aggregation layer network equipment including a first multiplexer / demultiplexer, a second multiplexer / demultiplexer, and an optical fiber connecting the first multiplexer / demultiplexer and the second multiplexer / demultiplexer, the first multiplexer / demultiplexer being connected to a plurality of access layer network equipment, the second multiplexer / demultiplexer being connected to a plurality of core layer network equipment, the core layer network equipment and the access layer network equipment including at least one optical module, the method for operating the passive aggregation layer network equipment includes: the first multiplexer / demultiplexer receiving optical signals from optical modules of a plurality of access layer network devices connected thereto, coupling the received optical signals to obtain a first coupled optical signal, and transmitting the first coupled optical signal to a second multiplexer / demultiplexer via an optical fiber; and a step of the second multiplexer / demultiplexer decoupling the first coupled optical signal and transmitting the resulting multiple optical signals to corresponding optical modules of the core layer network equipment.

12. The second multiplexer / demultiplexer receives optical signals from optical modules of a plurality of core layer network devices connected thereto, couples the received optical signals to obtain a second coupled optical signal, and transmits the second coupled optical signal to the first multiplexer / demultiplexer through an optical fiber; and wherein the first multiplexer / demultiplexer decouples the second coupled optical signal and transmits the resulting optical signals to corresponding optical modules of access layer network equipment.

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