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A 1pps+tod information single bus transmission synchronization system and method

A bus transmission and synchronization system technology, applied in the transmission system, digital transmission system, bus network, etc., can solve the problems of limited backplane bus resources, synchronous transmission influence, mutual interference, etc.

Active Publication Date: 2019-04-02
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the device capacity increases and the board density increases, the speed, bandwidth, and integration of the backplane bus continue to increase. However, the resources of the backplane bus are limited. The more the number of backplane buses occupied, the more stable the communication. Difference
In addition, in multi-backplane bus communication, there is mutual interference between multiple backplane buses. For synchronization, the length of each backplane bus is required to be the same. If the lengths are different, it will have a certain impact on synchronous transmission.

Method used

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  • A 1pps+tod information single bus transmission synchronization system and method
  • A 1pps+tod information single bus transmission synchronization system and method
  • A 1pps+tod information single bus transmission synchronization system and method

Examples

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no. 1 example

[0079] Such as figure 1 and figure 2 As shown, the 1PPS+TOD information single-bus transmission synchronization system in this embodiment includes a sending end 1 and a receiving end 2, and the sending end 1 and receiving end 2 are connected through a backplane bus.

[0080] Such as figure 1 As shown, the sending end 1 includes a first sampling module 11 , a storage module 12 , a framing module 13 , a verification module 14 and an encoding and sending module 15 . The first sampling module 11 is used to set the number of samples (that is, how many frames are sent per second) to the local TOD information and sample it. In the first embodiment, the first sampling module 11 samples the local TOD information at a frequency of 10,000 times per second with a clock of 125M. TOD information, the local TOD information of the sending end 1 is a 125M clock domain, including 80-bit information, 48-bit second value, and 32-bit nanosecond value. When the TOD nanosecond value is 0, it is t...

no. 2 example

[0102] Such as figure 1 and image 3 As shown, the 1PPS+TOD information single-bus transmission synchronization system in this embodiment includes a sending end 1 and a receiving end 2, and the sending end 1 and receiving end 2 are connected through a backplane bus. In the system of this embodiment, the sending end is the same in structure and function as the sending end 1 in the first embodiment. Such as figure 2 As shown, the receiving end 2' is similar to the receiving end 2 of the first embodiment, the difference is that the receiving end 2' of this embodiment does not include a phase-locked loop frequency multiplication module 20, but includes a second sampling module 21, a frame synchronization module 22, Decoding module 23 , deframing module 24 , verification module 25 , TOD maintenance module 26 . In this embodiment, the second sampling module is used to find and sample the intermediate moment of the symbol of the TOD coded bit stream in the local clock domain prov...

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Abstract

Provided are a synchronization system and method for single-bus transmission of 1PPS+TOD information, which relate to the field of clock synchronization. A sending end sets, via a first sampling module, the number of times of sampling a local TOD per second, a framing module forms sampled TOD information into a TOD frame, and after a check field is generated by a check module and the frame is coded by a coding and sending module, the frame is sent to a receiving end serially; after a clock is recovered from a TOD serial data stream by a phase-locked loop frequency-doubling module at the receiving end, a second sampling module uses the recovered clock, or a serial TOD is directly sampled by a local clock, and after frame synchronization is completed by a frame synchronization module, decoding, deframing and frame checking are carried out; when a check result of the TOD frame is correct and the frame is not lost, the local TOD is updated by a TOD maintenance module using a correct TOD; and when the TOD frame is lost or the check result is incorrect, synchronization is completed by adding ΔX to the most recently received correct TOD. In the present invention, 1PPS+TOD information is transmitted via a single bus, and thus, backplane bus resources are saved on, and the stability of communication is improved.

Description

technical field [0001] The invention relates to the field of clock synchronization, in particular to a 1PPS+TOD information single-bus transmission synchronization system and method. Background technique [0002] With the continuous development of communication technology and the continuous improvement of technical indicators, the function of time synchronization (including frequency synchronization and phase synchronization) has become a basic function that network communication equipment must support. 1588 time synchronization is a high-precision time synchronization protocol. Its implementation process is to transmit the 1PPS (pulse per second) and TOD (time of day) of the clock source provided by the source node to each slave node in the form of message interaction to realize The time synchronization between the slave node and the source node. [0003] In each network element node, the real-time time between the service board and the main control board also needs to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L12/40
CPCH04J3/0602H04J3/0685H04L12/40006
Inventor 李正辉刘福
Owner FENGHUO COMM SCI & TECH CO LTD
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