Clock transmission method, synchronization method and system, and sending and receiving device

A clock synchronization and clock interface technology, applied in the field of communication, can solve the problem of inability to accurately obtain the SSM information representing the clock quality level, and achieve the effect of increasing reliability and maintainability

Active Publication Date: 2011-04-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention is to provide a clock synchronization technology to overcome the defect that the existing technology cannot accurately obtain the SSM information representing the clock quality level in some cases

Method used

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  • Clock transmission method, synchronization method and system, and sending and receiving device
  • Clock transmission method, synchronization method and system, and sending and receiving device
  • Clock transmission method, synchronization method and system, and sending and receiving device

Examples

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Embodiment 1

[0068] Embodiment 1. A clock synchronization system

[0069] like figure 1 As shown, this embodiment mainly includes a clock interface unit 110, a clock control unit 120, and a time receiving unit 130, wherein:

[0070] The clock interface unit 110 is generally located at the service interface unit, and can typically be a Synchronous Digital Hierarchy (SDH) / Synchronous Optical Network (SONET) interface, a Quasi-Synchronous Digital Hierarchy (PDH) interface, a packet (Packet Over SDH / SONET, POS) interface, or a synchronous Ethernet interface, or a combined interface of these interfaces; it is used to extract the clock from the external interface, as well as the clock's SSM information, office direction information, and its own port type, and use it for Send the clock, SSM information, office direction information and port type to the clock control unit 120 through the clock cable;

[0071] The clock control unit 120 is connected to the clock interface unit 110, and can extra...

Embodiment 2

[0077] Embodiment 2, a clock synchronization method

[0078] combine figure 1 The clock synchronization system embodiment shown, figure 2 The shown embodiment mainly includes the following steps:

[0079] Step S210, the clock interface unit extracts the clock and the clock's SSM information and office direction information from the external interface, sends the extracted clock to the clock control unit through the clock cable, and sends the extracted SSM information, office direction information and itself (clock The port type of the interface unit) is sent to the clock control unit together through the clock cable;

[0080] Generally, the clock interface and the service interface share a physical interface;

[0081] The interface unit has multiple physical interfaces, and the processor of the interface unit receives SSM information from these physical interfaces;

[0082] At the same time, the clock interface unit sends the SSM information representing the clock quality ...

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Abstract

The invention discloses a clock transmission method, a clock synchronization method, a clock synchronization system, a clock sending device and a clock receiving device and aims to overcome the defect that a synchronization status message (SSM) which indicates a clock quality level cannot be acquired correctly under certain circumstances in the prior art. The clock synchronization system comprises a clock interface unit, a clock control unit and a time receiving unit, wherein the clock interface unit is used for extracting a clock as well as the SSM and local information of the clock from an external interface; the clock control unit is used for acquiring a reference clock with a highest quality level according to the SSM and the local information; and the time receiving unit is used for determining a local working clock according to the reference clock and the quality level of the clock. Compared with the prior art, one embodiment of the invention has the advantages that: the SSM clock quality level is transmitted to the clock unit or the time receiving unit through a clock cable, and the clock unit or the time receiving unit can determine the reference clock of a node according to the SSM level, so that the reliability and the maintainability of a synchronization clock system are improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a clock transmission method, a clock synchronization method and system, and a clock sending device and receiving device. Background technique [0002] In a digital communication network, in order to maintain data transmission accurately, it is necessary to keep the frequency and phase error of the clock signal of each network element within a certain range, which is called synchronization. [0003] Each country and operator will establish a clock synchronization network with its own frequency. For example, taking China's digital synchronization network as an example, it is divided into three layers: inter-provincial layer timing platform, provincial network layer timing platform and local network layer timing platform; high-level Transmits timing signals unidirectionally to lower layers. The inter-provincial network layer timing platform is responsible for the clock synchroniza...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04J3/06
Inventor 赵凯邵贵阳周自春
Owner ZTE CORP
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