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Method and system for synchronizing clock resuming in packet network

A technology of synchronous clock and recovery method, which is applied in the direction of synchronization device, data exchange network, digital transmission system, etc., to achieve the effect of reducing operating costs and protecting investment

Inactive Publication Date: 2006-06-28
SHENZHEN NEW GREENNET TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] At present, there is no known, published, or published patented technology that can be used to recover the synchronous clock signal when transmitting TDM / E1 signals on the IP / Ethernet network

Method used

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  • Method and system for synchronizing clock resuming in packet network
  • Method and system for synchronizing clock resuming in packet network
  • Method and system for synchronizing clock resuming in packet network

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Embodiment Construction

[0015] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0016] The synchronous clock recovery method of the present invention can be used figure 1 It includes five modules: high-precision crystal oscillator a, MCU adaptive clock adjustment algorithm module b, reference clock time stamp processing module c, service clock synchronization remaining time stamp processing module d, time stamp packing / unpacking Module e. They are described as follows:

[0017] a. The high-precision crystal oscillator a set on the equipment at both ends of the system is used as the reference clock of the local end, and is sent to the MCU adaptive clock adjustment algorithm module b and the reference clock time stamp processing module c for time stamp processing. After being processed by the reference clock time scale processing module c, it is used as a reference network clock for the synchronous residu...

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PUM

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Abstract

The invention discloses a kind of synchronous clock restoration method and system in group network. It adjusts the algorithm model through increasing self adapting clock, matches with standard time process model and high precision crystal oscillator, it restores a synchronous standard clock to replace the public network clock in ATM system, thus it can restore synchronous service clock by referencing the synchronous residual time scale method. The invention can realize EDMoIP / EloEthernet when transmitting TDM real-time service on IP / Ethernet network, it realizes the integration of traditional circuit service and group service in access network, makes current cheap IP network can carry voice, leasing wire, meeting television service, it reduces the running cost, protects the investment of current user. It can used in the service integration and development of IP access network widely.

Description

Technical field: [0001] The invention relates to a synchronous clock recovery method applied in a connectionless asynchronous variable-length packet network, especially in an IP network / Ethernet network. Background technique: [0002] In the synchronous and quasi-synchronous digital series (SDH, PDH), the analog or digital phase-locked loop technology is widely used to recover the synchronous clock, so as to accurately recover the service data from the transmission code stream. But the prerequisite is that the remote end can provide or transmit synchronous / quasi-synchronous clock information so that the receiving end can extract and recover the clock from the code stream. [0003] However, such a method and system are not feasible on the IP / Ethernet network, because there is no required synchronous / quasi-synchronous information in the code stream transmitted by the IP / Ethernet network. On the contrary, on the IP network, the continuity and periodicity of the continuous bit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L7/02H04L29/06
Inventor 宋强秦柯矫立国
Owner SHENZHEN NEW GREENNET TECH
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