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Timestamp-based clock recovery method and device

A technology of clock recovery and time stamping, which is applied to synchronization devices, time-division multiplexing systems, multiplexing communications, etc., and can solve problems such as the inability to respond quickly at the sending end and the impact of adaptive clock recovery at the sending end without consideration

Active Publication Date: 2012-02-01
SANECHIPS TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

After studying the existing adaptive clock recovery technology, the inventor found that most of the existing technologies did not consider the impact of sudden changes in the frequency of the sending end on the adaptive clock recovery when implementing adaptive clock recovery, so the frequency of the sending end cannot be adjusted. React quickly to sudden changes

Method used

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  • Timestamp-based clock recovery method and device
  • Timestamp-based clock recovery method and device
  • Timestamp-based clock recovery method and device

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Embodiment Construction

[0057] The invention provides a time stamp-based clock recovery method and device, which can quickly react when the transmission frequency of the sending end changes during the clock recovery process. Moreover, the present invention further adopts a strategy of keeping the clock frequency constant for packet loss and out-of-sequence situations in the packet message transmission process, so that the influence of packet loss and out-of-order situations on the frequency recovery algorithm is greatly reduced.

[0058] The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0059] The main idea of ​​the present invention is to regard the sending end, the receiving end and the PTN network as a "black box" (such as figure 1 As shown), when keeping the TDM service payload packet interval at the sending end equal to the ideal packet sending interval at the receiving end, the clock frequency of the TDM service a...

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Abstract

The invention provides a timestamp-based clock recovery method and a timestamp-based clock recovery device. The method comprises that: a receiver receives a packet message encapsulated with time division multiplexing (TDM) service data from a packet transport network, and records a receiving timestamp of the packet message; and the receiver calculates and updates the clock frequency of the receiver according to a transmission time difference between two adjacent packet messages and a packet delay variation of the transmission of the packet messages in the packet transport network. By the method and the device, sudden changes in the frequency of a transmitter can be tracked, and the transmission frequency of the transmitter can be rapidly locked.

Description

technical field [0001] The invention relates to the technical field of circuit emulation of Time Division Multiplexing (TDM, Time Division Multiplexing) service data in the communication field, in particular to a time stamp-based clock recovery method and device. Background technique [0002] The TDM service is a common service in the communication field, such as a voice call. Leasing a TDM leased line for TDM service transmission usually requires expensive fees, and the resource utilization rate is not high. With the development of circuit emulation technology and packet transmission technology, in order to save costs and improve resource utilization, TDM services are usually grouped and packaged into edge-to-edge pseudowire emulation (PWE3, Pseudo Wire Emulation Edge) through circuit emulation technology. -to-Edge) packets are transmitted on the Packet Transport Network (PTN, Package Transport Network). [0003] When the TDM service is transmitted in the packet transport...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04L7/00
CPCH04J3/0664
Inventor 曾名志
Owner SANECHIPS TECH CO LTD
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