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Method, device and system for transmitting tdm service in packet network

A packet network and service technology, applied in the field of communications, to reduce design costs and achieve significant effects

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

AI Technical Summary

Problems solved by technology

However, in practical applications, many TDM chip interfaces do not have a TDM associated clock, but only a TDM service data bus, so the application of the existing differential clock recovery implementation method has certain limitations

Method used

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  • Method, device and system for transmitting tdm service in packet network
  • Method, device and system for transmitting tdm service in packet network
  • Method, device and system for transmitting tdm service in packet network

Examples

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Embodiment Construction

[0039] In the PSN network, when the TDM service has an associated clock signal, the clock recovery algorithm using the differential mode can realize the transmission of the clock information. The following describes the specific implementation process of the differential clock recovery mode in detail:

[0040] At the source end, the clock signal to be transmitted is divided to generate a low-frequency clock. Please refer to figure 1 , figure 1 Schematic diagram of obtaining differential information for TDM services with associated clocks. Such as figure 1 As shown, at the source end, the channel-associated clock of the source end TDM service is frequency-divided to M hz (the value of M will be different for different manufacturers); and then the Common The clock (common reference clock) counts periodically, and the obtained count value N is used as differential information, which is put into the CES service message and sent to the sink.

[0041]At the sink end, after rece...

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Abstract

The invention discloses a method, a device and a system for transmitting TDM services in a packet network. The method for transmitting the TDM services in the packet network is characterized by comprising the following steps: sampling the TDM service signals to be transmitted according to a first reference clock signal, and acquiring difference information of the TDM service signals relative to the first reference clock signal; encapsulating the acquired difference information and the TDM service signals in a CES message; and encapsulating the CES message containing the difference informationand the TDM service signals in a packet message, and transmitting the packet message through the packet network. The transmission can realize the transfer of the clock information without restoring the clock signal from the TDM services, thereby ensuring that the TDM services realize clock synchronization after passing through a PSN network, avoiding the need of a large amount of logical resourcesand FIFO due to the restoration of a TDM service channel associated clock, and reducing the design cost of chips.

Description

technical field [0001] The invention relates to the communication field, in particular to a method, device and system for transmitting TDM services in a packet network. Background technique [0002] With the rapid development of data and video services, the traditional telecom transmission network designed to carry TDM (Time Division Multiplex) services is becoming more and more powerless in the face of the new generation of packet services. The transmission network is moving to be able to carry more efficient PSN (Packet Switched Network packet switching network) evolution. In this evolution process, although the proportion of traditional TDM services is gradually decreasing, its absolute business volume still maintains a trend of continuous growth, and will remain an important source of income for operators for a long period of time. Consider the problem of how to transmit traditional TDM services such as voice on the packet network. [0003] At present, CES (Circuit Emu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00H04L12/56H04J3/06
Inventor 余文军
Owner HUAWEI TECH CO LTD
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