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Method and apparatus for transferring clock between networks

A network and clock technology, applied in the field of communication, can solve problems such as the inability to select a level clock and the inability to compare clock quality

Active Publication Date: 2011-12-07
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the IEEE 1588PTP network, it judges the level of time accuracy based on the timeSource information and PTP Clock Class information transmitted by the PTP protocol. This information has nothing to do with the clock, so it uses the SSM information transmitted based on the SDH protocol to determine the clock with the SDH network There is a big difference in the quality level of the protocol, so a device supporting one of the protocols cannot compare the quality of the clocks transmitted based on different protocols, so it cannot select a clock with a higher level

Method used

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  • Method and apparatus for transferring clock between networks
  • Method and apparatus for transferring clock between networks
  • Method and apparatus for transferring clock between networks

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no. 3 example

[0088] For the third embodiment, after extracting the first information SSM information corresponding to the clock from the protocol frame transmitted by each port based on the SDH protocol, all the SSM information extracted can also be obtained according to the PTP Clock Class shown in Table 3 Correspondence with SSM information, convert SSM corresponding to all clocks into PTP Clock Class. Then use the source selection algorithm based on the PTP protocol, such as the BMC algorithm, to perform unified source selection on the clock corresponding to the converted PTP Clock Class and the clock recovered from the packets sent from each IEEE 1588 PTP port.

[0089] The above-mentioned embodiments are all described by taking SDH network and IEEE 1588PTP network as examples. For the clock transfer between networks that transmit information related to the clock based on different protocols, such as the clock transfer between the SONET network and the IEEE 1588PTP network, all can be ...

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Abstract

The invention discloses a clock transmitting method and a clock transmitting device between the net, including: obtaining a corresponding second information based on the clock source transmitted by the first protocol through the first net device and a corresponding second information of the transmitted clock source based on the second protocol through the second net; performing the unite source selection based on the second information and the second protocol source selection method, which is convenient for the device of different type nets, to select the clock with higher level based on the clock transmitted by different protocols, thereby realizing the normalization management based on the clock transmitted by different protocols.

Description

technical field [0001] The invention relates to the communication field, in particular to the technology of clock transfer between networks. Background technique [0002] The telecommunication transport network is undergoing the evolution process from TDM (Time Division Multiplexing) transport network, such as SDH (Synchronous Digital Hierarchy, Synchronous Digital Series) / SONET (Synchronous Optical Network, Synchronous Optical Network), to packet switching transport network . In order to ensure network stability and business continuity, a gradual evolution method is generally adopted, so that there will be a phenomenon of coexistence and integration of two transport networks for a long time. [0003] The two transmission networks have their own clock transmission methods. The clock transmission of the TDM transmission network is implemented based on the SDH protocol, such as figure 1 The clock transmission mode of the SDH network is shown in the figure. It can be seen th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L7/00H04L12/28
CPCH04J3/0673H04J3/0667H04J2203/0089H04J3/0647H04J3/0641
Inventor 程永包孝东张展赫英海吴宁
Owner HUAWEI TECH CO LTD