Apparatus and method for clock recovery for time division multiplexing business

A clock recovery and business technology, applied in the field of data transmission, can solve problems such as difficulty in model establishment, poor adaptability, and difficulty in adjusting filter parameters, and achieve simple implementation, solve jitter problems, and good clock recovery effects

Inactive Publication Date: 2005-02-16
HUAWEI TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Due to the complex business conditions of the IP network, it is difficult to establish a suitable model, and it is also difficult to adjust the parameters of the filter
On the other hand, due to the variability of IP networks, the parameters of one network model may not be suitable for another network. Therefore, this method of using filtering algorithms to avoid the jitter of the receiver's recovery clock due to the burstiness of data transmission is in the adaptability relatively poor

Method used

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  • Apparatus and method for clock recovery for time division multiplexing business
  • Apparatus and method for clock recovery for time division multiplexing business
  • Apparatus and method for clock recovery for time division multiplexing business

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Embodiment Construction

[0026] Preferred embodiments of the present invention are illustrated below in conjunction with the accompanying drawings.

[0027] image 3 is a schematic diagram illustrating a clock recovery apparatus according to an embodiment of the present invention. Such as image 3 As shown, the present invention improves the existing clock recovery technology from two aspects: 1, before the phase detector, increase the flow shaping process, and then output the write signal to the phase detector after carrying out the flow shaping process to the received data of the FIFO . 2. The filter adopts the secondary filtering method.

[0028] In this embodiment of the present invention, the traffic shaping device may include: a frequency divider for dividing the frequency of the reference clock; a token counting device for increasing the number of tokens according to the reference clock frequency divided by the frequency divider , and when the receiving end FIFO sends a piece of data, the t...

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Abstract

The method includes steps: after carrying out flux shaping for received IP data packet, outputting write signal; based on write signal and read clock output from digital oscillator, determining buffered data quantity by FIFO; based on write signal and determined buffered data quantity, calculating filtering parameters; based on filtering parameters, determining recovered read clock. Coarse adjustment + fine adjustment in two stages to recover clock are adopted in flux shaping and in filer so as to solve jitter issue in recovering clock. Features are: simple, wide suitable range and good result.

Description

field of invention [0001] The present invention relates to data transmission of IP (Internet Protocol) network, in particular to a method for clock recovery when transmitting TDM (Time Division Multiple Access) service in IP network. Background technique [0002] Carrying out voice service transmission through an IP network is a technology that has been adopted more and more generally. Such as figure 1 As shown, the ordinary telephone is connected to the PSTN (Public Switched Telephone Network) network, and then connected to the TDMoIP (Time Division Multiple Access over IP) equipment through the E1 trunk line, and the TDM service data is converted into IP packets and sent to the IP network for transmission . At the other end of the IP network, the TDMoIP device restores the IP packet to TDM service data, and then sends it to another telephone through the PSTN. [0003] exist figure 1 In the illustrated solution of using the IP network to transmit voice services, since t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/02H04L12/861H04M1/26
Inventor 乐伟军陈永瑜洪建明
Owner HUAWEI TECH CO LTD
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