WO2021031969A1 - Multiplexing service single board, communication apparatus, and clock synchronization method therefor - Google Patents

Abstract

The embodiments of the present invention provide a multiplexing service single board, a communication apparatus, and a clock synchronization method therefor. A clock receiving module and a service module are provided on a mainboard of the multiplexing service single board, and a clock sending module and a clock module are further integrated and provided on said mainboard, such that when a communication apparatus uses the multiplexing service single board to perform clock synchronization, the communication apparatus can send a clock signal to a backplane by means of the clock sending module of the multiplexing service single board, and a clock receiving module of each service single board on the backplane is set to obtain the clock signal from the backplane. In other words, the multiplexing service single board can both realize the function of a clock board providing a backplane with a clock signal, as in the relevant art, and also obtain a clock signal from the backplane and send said clock signal to service modules to implement corresponding services, such that it is not necessary to separately make a clock board, which can reduce costs and increase board material utilization. Also, the present invention is able to avoid a separate clock board filling a slot, thus increasing the number of available slots for service single boards inside the frame, increasing slot utilization.

Description

Multiplex service single board, communication device and clock synchronization method thereof Technical field

The present invention relates to the field of communication technology, in particular to a multiplex service single board, a communication device and a clock synchronization method thereof.

Background technique

In related technologies, the clock synchronization in the frame mostly adopts the fixed slot in the frame to place the clock board, and the other slots place the service board. The clock signal is sent to the backplane through the clock board, and the service board obtains the clock signal from the backplane. Each service board in the unit provides clock synchronization. First, the separate production and setting of the clock board itself wastes board resources, and a clock board needs to occupy a slot, occupying the slot resources in the frame, and it is not conducive to the improvement of resource utilization.

Summary of the invention

The embodiment of the present invention provides a multiplexed service single board, a communication device and a clock synchronization method thereof, which solves the problem of low resource utilization caused by the use of a separate clock board in the related technology to provide clock synchronization for the service single board in the frame.

In order to solve the above technical problem, an embodiment of the present invention provides a multiplexed service single board, including: a main board, a clock module, a clock sending module, a clock receiving module, and a service module provided on the main board; the clock sending module, Set to obtain a clock signal from the clock module and send it to the backplane; the clock receiving module is set to obtain a clock signal from the backplane and send it to the service module; the service module is set to be based on the The clock signal realizes the corresponding business.

In order to solve the above problem, an embodiment of the present invention also provides a communication device, including a backplane, a single board slot group provided on the backplane, and a single board slot provided on the single board slot group The single board slot group includes at least two single board slots, one single board slot corresponds to one service single board, and at least one of the service single boards is a multiplex service single board Board, the multiplexing service single board includes: a main board, a clock module, a clock sending module, a clock receiving module, and a service module arranged on the main board;

The clock sending module is configured to obtain a clock signal from the clock module and send it to the backplane;

The clock receiving module is configured to obtain a clock signal from the backplane and send it to the service module; the service module is configured to implement corresponding services based on the clock signal.

In order to solve the above-mentioned problem, an embodiment of the present invention also provides a clock synchronization method of the above-mentioned communication device, including: sending a clock signal to the backplane through the clock sending module of the multiplexing service single board; The clock receiving module of the single board obtains the clock signal from the backplane.

According to the multiplexing service single board, the communication device and the clock synchronization method provided by the embodiments of the present invention, in addition to the clock receiving module and the service module, the main board of the multiplexing service single board is also integrated with a clock sending module and a clock module Therefore, when the communication device uses the multiplexed service single board for clock synchronization, the clock sending module of the multiplexed service single board can send clock signals to the backplane, and the clock receiving modules of each service single board on the backplane can be set to slave The backplane obtains the clock signal; that is, the multiplexed service single board can not only realize that the clock board in the related technology provides the clock signal for the backplane, but also obtain the clock signal from the backplane and send it to the service module to realize the corresponding service. Therefore, there is no need to separately produce and generate the clock board, which can save costs and improve the utilization rate of the board. At the same time, it can avoid the occupation of slots by a separate clock board, thereby increasing the number of available slots for the business single board in the frame, so that you can set more Multiple service boards improve slot utilization and can be better applied to various application scenarios of multi-node communication devices (such as multi-node servers).

Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become apparent from the description in the specification of the present invention.

Description of the drawings

FIG. 1 is a schematic diagram 1 of the structure of a multiplexing service single board in Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram 2 of the structure of a multiplexing service single board in Embodiment 1 of the present invention;

3 is a schematic flowchart of a clock synchronization method of a communication device according to Embodiment 3 of the present invention;

Fig. 4 is a schematic diagram of a single-channel clock topology in a slot occupied by a clock board in the related art of the third embodiment of the present invention;

FIG. 5 is a schematic diagram of a single-channel clock topology of a multiplexing service single board in a related technology according to Embodiment 3 of the present invention;

6 is a schematic diagram of a single-channel clock structure of a multiplexed service single board in a related technology of Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram 1 of a dual clock topology of a slot occupied by a clock board in the related technology of the third embodiment of the present invention;

8 is a schematic diagram 2 of the dual clock topology of the multiplexing service single board in the related technology of the third embodiment of the present invention;

FIG. 9 is a schematic diagram of the dual clock structure of the multiplexed service single board in the related technology of the third embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail through specific implementations in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Example one:

In related technologies, the service single board mainly includes a clock receiving module and a service module. The clock receiving module is set to obtain a clock signal from the backplane and send it to the service module that needs the clock signal. The service module executes the corresponding clock signal according to the received clock signal. business. The clock signal obtained by the service single board is sent to the backplane by the clock board separately arranged in the slot. In related technologies, in order to achieve clock synchronization in the frame, a clock board must be used, and a clock board slot dedicated for placing the clock board is set in the slot in the frame. It not only wastes plate resources, increases costs, but also wastes slot resources, which is not conducive to the improvement of resource utilization.

In response to the above problems, this embodiment provides a multiplexed service single board with a new structure. The multiplexed service single board includes a main board, and as shown in FIG. 1, it also includes a clock module 10 and a clock transmitting board arranged on the main board. Module 11, clock receiving module 12 and service module 13, including:

The clock sending module 11 is set to send a clock signal to the backplane; in one example, the input end of the clock sending module 11 can be connected to the clock module 10 to obtain the clock signal, and the output end is connected to the clock bus on the backplane. The clock signal obtained from the clock module 10 is sent to the backplane;

The clock receiving module 12 is configured to obtain a clock signal from the backplane and send it to the service module 13 that needs the clock signal;

The service module 13 is set to implement corresponding services based on a clock signal; and it should be understood that the services specifically implemented by the service module 13 in this embodiment can be flexibly set according to specific application scenarios.

That is, the multiplexing service single board provided in this embodiment not only has the function of a pure service single board in related technologies, but also has the function of a clock board. When using the multiplexing service single board provided in this embodiment to synchronize the clock in the frame, there is no need to set a separate clock board, and only the multiplexing service single board can be used to realize the function of the clock board and the function of one service single board, thus saving Separate production of the board resources required for the clock board saves costs and improves the utilization rate of the slots in the frame.

In some examples of this embodiment, when there are multiple single board slots in the frame, the multiplex service single board can be set on the single board slot that needs to carry the clock transmission function according to the specific application scenario. On the board slot, set a pure business single board that currently does not have the clock sending function.

In other examples of this embodiment, when there are multiple single board slots in the frame, multiplex service single boards can also be set on all single board slots, but only for single boards that need to carry the clock transmission function. Only the multiplexed service single board on the board slot enables the clock sending function of its clock sending module; for the multiplexed service single board on other slots, the clock sending function of its clock sending module is not enabled. This setting method can make the structure of each single board slot in the frame completely consistent, which is more conducive to production, management, and subsequent use and maintenance. In this application example, referring to FIG. 2, the multiplex service single board in this embodiment may further include an enable control module 14 configured to control the turning on and off of the transmission enable of the clock transmission module 11;

When the sending enable of the clock sending module 11 is in the on state, the clock sending module 11 sends a clock signal to the backplane;

When the sending enable of the clock sending module 11 is turned off, the clock sending module 11 cannot send a clock signal to the backplane.

For example, in an example of this embodiment, it is assumed that there are 5 single board slots in the frame, single board slot 1 needs to carry the clock sending function, and single board slots 2-5 do not need to carry the clock sending function. Set the multiplex service single board on the single board slot 1, set the pure service single board that does not currently have the clock transmission function on the single board slots 2-5, and set the multiplex service single board on the single board slot 1 The sending enable of the clock sending module 11 is in the on state; and it should be understood that, in this example, the multiplexing service single board on the single board slot 1 may not include the enable control module 14, and the clock sending module 11 is always It is in a state where clock signal transmission is possible.

For another example, in another example of this embodiment, suppose that there are 5 single board slots in the frame, single board slot 1 needs to carry the clock sending function, and single board slots 2-5 do not need to carry the clock sending function. Single board slots 1-5 are equipped with multiplex service single boards, the clock transmission module 11 of the multiplex service single board on single board slot 1 is enabled, and the single board slots 2-5 The sending enable of the clock sending module 11 of the multiplexing service single board is in the off state.

In addition, it should be understood that the presentation form of the clock module 10 integrated on the motherboard in this embodiment can also be flexibly set. For example, the clock module 10 may be a functional unit integrated on the motherboard, or a daughter card set on the motherboard (removable or not), or a high-speed serial computer expansion bus standard set on the motherboard (Peripheral Component Interconnect Express, PCIE) card (can be disassembled or not disassembled).

In addition, it should be understood that the clock sending module 11 and the clock receiving module 12 in this embodiment may be integrated in a circuit or chip (for example, an MLVDS chip), or may be separately provided. Correspondingly, the pure service single board in this embodiment may at least have the following forms:

One form is that only the clock receiving module 12 and the service module 13 are provided on the main board;

Another form is that a clock sending module 11, a clock receiving module 12 and a service module 13 are integrated on the main board;

In another form, a clock sending module 11, a clock receiving module 12, a service module 13, and an enable control module 14 are integrated on the main board, and the enable control module 14 is in a closed state.

It can be seen that the multiplexing service single board provided in this embodiment can be flexibly combined with a pure service single board, which not only saves the material resources required for making a clock board separately, saves costs, but also improves the utilization of slots in the frame. rate.

Embodiment two:

This embodiment provides a communication device. The communication device includes a backplane, a single board slot group provided on the backplane, and a business single board provided on the single board slot in the single board slot group;

In this embodiment, the single-board slot group includes at least two single-board slots, and one single-board slot corresponds to one service single board; it should be understood that the single-board slot group in this embodiment includes the single-board The number of slots can be flexibly set according to specific needs.

And in this embodiment, at least one of the service boards included in the communication device is a multiplexed service single board, and the multiplexed service single board may include a main board, a clock module, a clock sending module, and a clock receiving board provided on the main board. Modules and business modules;

The clock sending module is set to send the clock signal obtained from the clock module to the backplane;

The clock receiving module is set to obtain the clock signal from the backplane and send it to the service module;

The business module is set to implement the corresponding business based on the clock signal.

And optionally, the multiplexing service single board adopted by the communication device in this embodiment may further include an enable control module, which is configured to control the turning on and off of the transmission enable of the clock transmission module;

When the sending enable of the clock sending module is on, the clock sending module sends a clock signal to the backplane; when the sending enable of the clock sending module is off, the clock sending module cannot send a clock signal to the backboard.

In some examples of this embodiment, in the single board slot group included in the communication device, the service single board in the set target single board slot is a multiplexed service single board, and the clock of the multiplexed service single board is sent The transmission enable of the module is in the on state, and the service boards on other board slots are pure service boards that currently do not have the clock transmission function. For example, suppose that the single board slot group included in the communication device includes six single board slots, of which single board slot 1 needs to carry the clock sending function, that is, single board slot 1 is the target single board slot, and the single board slot Bits 2-6 do not need to carry the clock transmission function. The single board slot 1 is equipped with a multiplex service single board and the clock transmission module of the multiplex service single board is enabled to send the clock transmission module, and the single board slots 2-6 are set as pure service single boards.

In another example of this embodiment, all service single boards set in the single board slot group included in the communication device are multiplex service single boards, and the target single board slot set in the single board slot group The transmission enable of the clock transmission module of the multiplex service single board on the position is in the on state, and the transmission enable of the clock transmission module of the multiplex service single board on the other single board slot is in the off state. For example, suppose that the single board slot group included in the communication device includes six single board slots, of which single board slots 1 and 2 need to carry the clock transmission function, that is, single board slots 1 and 2 are target single board slots , Slots 3-6 of the board do not need to carry the clock sending function. Single board slots 1-2 are equipped with multiplex service single boards and the clock transmission module of the multiplex service single board is enabled to send the clock, and the multiplex service single boards on single board slots 3-6 are clocked The transmit enable of the module is turned off; and in this example, the multiplexing service single board on the target single board slot and the multiplexing service single board on other single board slots can obtain the clock signal from the backplane completely. The same, without the need for differentiation or specialization, can further simplify the control and application of the system.

Of course, it should be understood that the combination between the multiplexing service single board and the multiplexing service single board, and the combination between the multiplexing service single board and the pure service single board in this embodiment can be flexibly set, and not Limited to the two ways in the above example.

In this embodiment, in the single-board slot group included in the communication device, the target single-board slot may include only one or at least two (for example, an application scenario where the main and standby clocks are used, and the standby clock may be 1. One or more), a target single board slot includes a multiplex service single board, the clock transmission module of the multiplex service single board includes at least one clock bus transmission end, and the clock transmission module of each multiplex service single board adopts the same The clock bus sending end of the clock bus is connected to the clock bus on the backplane; or, the clock sending module of each multiplexing service single board uses different clock bus sending ends to connect to different clock buses on the backplane; which connection method is used It can be flexibly set according to needs.

In this embodiment, for the backplane of the communication device, the definition of the backplane signal sent to each service single board may be exactly the same for each of the above-mentioned service single boards, which can greatly improve versatility and reduce design difficulty. For example, the clock signals sent by the backplane to the above-mentioned service boards can be the same, so the service boards can be inserted into any board slot. Compared with related technologies, the solution of using a separate clock board can avoid the risk of misinsertion when there are service slots and clock slots in the frame at the same time, and improve reliability.

And according to the above analysis, in some examples of this embodiment, the service boards used in the communication device frame may all be multiplexing service boards, and the service boards used may be service orders with exactly the same structure. At this time, the bills of materials for all business boards are the same. In other examples of this embodiment, among the service boards used in the communication device frame, multiple service boards may be used in slots that need to carry the clock transmission function, and pure service boards may be used in other slots, and The basic bill of materials for the multiplex service single board and the pure service single board can be the same. This can greatly reduce development workload, further reduce costs, and improve ease of use and versatility.

In this embodiment, in order to ensure that the basic bill of materials of the multiplexed service single board and the pure service single board are the same, when the pure service single board adopts a clock receiving and sending integrated chip (for example, a clock receiving and sending integrated MLVDS chip), the multiplexing The business single board also adopts a clock receiving and sending integrated chip (for example, an MLVDS chip integrating clock receiving and sending); when a pure business unit adopts a chip with only clock receiving function (for example, an MLVDS chip with only clock receiving function), it is repeated The service board also needs to use a chip with only clock receiving function (for example, an MLVDS chip with only clock receiving function), and on this basis add a chip with clock sending function and a clock module, and can be selected according to specific application scenarios The increase in nature enables the control module.

Example three:

This embodiment provides a clock synchronization method of the communication device shown in the foregoing embodiment. Please refer to FIG. 3, which mainly includes:

S301: Send a clock signal to the backplane through the clock sending module of the multiplexing service single board.

S302: Obtain the clock signal from the backplane through the clock receiving module of each service single board, so that the service module that requires the clock signal performs corresponding service processing according to the clock signal.

For example, suppose the communication device includes a frame with N single board slots, and there are M (M is greater than or equal to 1, and less than or equal to N) sets of clocks on the backplane, that is, there are M single board slots required for business single boards Bear the clock transmission function.

In this embodiment, each single board slot bearing the clock sending function can be set to be responsible for sending a group of clocks of the backplane. For example: single board slot 1 is responsible for the transmission of the first group of clock buses, single board slot 2 is responsible for the transmission of the second group of clock buses,..., single board slot M is responsible for the transmission of the M th group of clock buses. And in this embodiment, the multiplexed service single board can be used on each single board slot; but only the clock sending module of the multiplexed service single board on the above M single board slots is enabled, and the other The transmission enable of the clock transmission module of the multiplex service board on the slot is disabled. At this time, the service boards of all slots can be boards of the same bill of materials.

As shown in the above analysis, the clock module in this embodiment can be, but is not limited to, a functional unit, a sub-card or a PCIE standard card, which is provided on the main board of the multiplexing service single board.

In order to facilitate understanding, the following embodiment uses a synchronous clock to adopt a multipoint low voltage differential signal (MLVDS) level standard on the backplane. At this time, there are M MLVDS chips on each business single board (when one MLVDS chip has multiple receiving channels, the number of MLVDS chips used on the business single board can also be less than M, as long as the available receiving channels meet the requirements of M That's it).

For ease of understanding, this embodiment is described below in combination with two specific application scenarios as examples.

Application scenario one:

Assuming that a communication device has a frame with 4 slots, slot 1 needs to carry the clock sending function to provide clock synchronization. In the related technology, when a clock board is used, as shown in Figure 4, the clock board occupies one slot, and only three service single boards can be placed at this time. When the main and standby clocks are used, the clock board needs to occupy at least two slots, and at most two service single boards can be placed at this time. As shown in Figure 5, when the composite service single board in this embodiment is used, no matter if one clock is used or a master/standby clock is used, 4 service single boards can be placed, for example, one of the slots is used as a multiplexed service single Board slots, the remaining three are used as service single board slots. The clock transmission module of the multiplexed service single board in the multiplexed service single board slot is enabled to send, and the service single boards on other slots are multiplexed services. For single board, you don't need to turn on the sending enable. When the service single board adopts the MLVDS receiving chip, please refer to Figure 6 for the structure of a multiplexed service single board at this time. It includes a clock module and an MLVDS chip. The MLVDS chip realizes the sending function of the clock sending module and can The sending enable of the clock sending module is controlled by the sending enable terminal. The clock receiving function of the clock receiving module can also be realized through the MLVDS chip and sent to the corresponding service module through the clock driving module.

Application scenario two:

In this application scenario, it is still assumed that there is a communication device with a frame with 4 slots. In order to improve the reliability of the system, the clock source transmission adopts the backup mode, and both the slot 1 and the slot 2 need to carry the clock transmission Function, the backplane has two sets of clock buses CLK1 and CLK2. At this time, a structure of a multiplexed service single board is shown in FIG. 9, which is equipped with two MLVDS chips relative to FIG. 6. Single board slot 1 and single board slot 2 are multiplexed service single boards with clock transmission module. Slots 3 to 4 can use multiplexed service single board or pure service single board. board. When the clock transmission module detects that the service slot is No. 1 or No. 2, it turns on the transmission enable, and when it detects that the service slot is not No. 1 or 2, it turns off the transmission enable.

In an application scenario of this embodiment, please refer to FIG. 7. In FIG. 7, the clock transmission modules of the multiplexed service boards in service slots 1 and 2 all use CLK1, and CLK2 only receives; the backplane Connect the CLK1 end of the multiplexing service board in the business slot 1 and other slots CLK2 together, and connect the CLK1 end of the multiplexing service board in the business slot 2 to the business slots CLK2 and 3 CLK1 in slot 4 is connected together.

The clocks of the service boards CLK1 and CLK2 of all service slots are all enabled.

No. 1 service slot CLK1 comes from this service slot, and CLK2 comes from No. 2 service slot.

No. 2 service slot CLK1 comes from this service slot, and CLK2 comes from No. 1 service slot.

The remaining slots CLK1 are from service slot 2 and CLK2 are from service slot 1.

In another application scenario of this embodiment, please refer to FIG. 8. The clock sending module of the multiplexed service single board in service slot 1 in FIG. 8 uses the CLK1 clock bus sending end; The clock sending module of the multiplexing service single board uses the CLK2 clock bus sending end. On the backplane, connect the CLK1 end of the multiplexing service board of the business slot 1 and other slots CLK1 together, and connect the CLK2 end of the multiplexing service board of the business slot 2 to the business slot 1 CLK2, CLK2 in slots 3 to 4 are connected together.

And optionally, in this embodiment, the clock sending module of the multiplexed service single board of the service slots 1 and 2 can be enabled at the same time, and at this time, the replication of the service slots 1 and 2 The service board only sends clock signals to the clock bus for which it is currently responsible; in some application scenarios, it is also possible to enable only the sending enable of the clock sending module of the multiplex service board that is currently the main clock source, and set the current The transmission enable of the clock transmission module of the multiplex service single board as the standby clock source is disabled. The specific control method can be flexibly set according to specific application scenarios.

It can be seen that those skilled in the art should understand that all or some of the steps, functional modules/units in the system and the device in the method disclosed above can be implemented as software (which can be implemented by computer program code executable by a computing device ), firmware, hardware and their appropriate combination. In hardware implementations, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may consist of several physical components. The components are executed cooperatively. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit .

In addition, as is well known to those of ordinary skill in the art, communication media usually contain computer-readable instructions, data structures, computer program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium. Therefore, the present invention is not limited to any specific combination of hardware and software.

The above content is a further detailed description of the embodiments of the present invention in combination with specific implementations, and it cannot be considered that the specific implementations of the present invention are limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims (10)

A multiplex service single board, comprising: a main board, a clock module, a clock sending module, a clock receiving module, and a service module arranged on the main board; The clock sending module is configured to obtain a clock signal from the clock module and send it to the backplane; The clock receiving module is configured to obtain a clock signal from the backplane and send it to the service module; The service module is configured to implement corresponding services based on the clock signal. The multiplex service single board according to claim 1, further comprising an enable control module configured to control the turning on and off of the transmission enable of the clock transmission module; When the sending enable of the clock sending module is in the on state, the clock sending module sends a clock signal to the backplane; When the sending enable of the clock sending module is turned off, the clock sending module cannot send a clock signal to the backplane. A communication device includes a backplane, a single board slot group arranged on the backboard, and a business single board arranged on the single board slot in the single board slot group; The single board slot group includes at least two single board slots, one single board slot corresponds to one service single board, and at least one of the service single boards is a multiplexing service single board, and the multiplexing service The single board includes: a main board, a clock module, a clock sending module, a clock receiving module, and a service module arranged on the main board; The clock sending module is configured to obtain a clock signal from the clock module and send it to the backplane; The clock receiving module is configured to obtain a clock signal from the backplane and send it to the service module; The service module is configured to implement corresponding services based on the clock signal. The communication device according to claim 3, wherein the multiplex service single board further comprises an enable control module, which is configured to control the turning on and off of the transmission enable of the clock transmission module; When the sending enable of the clock sending module is in the on state, the clock sending module sends a clock signal to the backplane; When the sending enable of the clock sending module is turned off, the clock sending module cannot send a clock signal to the backplane. The communication device according to claim 4, wherein all service single boards in the single board slot group are multiplex service single boards, and the target single board slot set in the single board slot group The transmission enable of the clock transmission module of the multiplex service single board on the board is in the on state, and the transmission enable of the clock transmission module of the multiplex service board on the other single board slot is in the off state; or, The service single board on the target single board slot set in the single board slot group is a multiplex service single board, and the transmission enable of the clock transmission module of the multiplex service single board is turned on, and other single board slots The business single board on the bit is a pure business single board without a clock module. The communication device according to claim 5, wherein a target single board slot includes a multiplexed service single board, the clock sending module of the multiplexed service single board includes at least one clock bus sending end, and each multiplexed service The clock sending module of the single board adopts the same clock bus sending end to connect to different clock buses on the backplane; or, the clock sending module of each multiplexed service single board adopts different clock bus sending ends and the backplane On the different clock bus connections. The communication device according to any one of claims 3 to 6, wherein the clock sending module is a functional unit integrated on the main board, or is a sub-card arranged on the main board, or is arranged on the main board. The high-speed serial computer expansion bus standard card on the main board. The communication device according to any one of claims 3 to 6, wherein the clock signals obtained by the service boards from the backplane are the same. The communication device according to any one of claims 3 to 6, wherein the basic bills of materials of the service boards are the same. A method for clock synchronization of a communication device according to any one of claims 3 to 9, comprising: Sending a clock signal to the backplane through the clock sending module of the multiplexing service single board; Obtain a clock signal from the backplane through the clock receiving module of each service single board.

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