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Method and device for extended super frame synchronization for T1 system

A frame synchronization and frame positioning technology, applied in synchronization devices, transmission systems, digital transmission systems, etc., can solve the problems of large device implementation area, high cost, and large memory, and achieve fast frame synchronization, small memory, and small area. Effect

Active Publication Date: 2007-11-14
SANECHIPS TECH CO LTD
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Problems solved by technology

[0013] The purpose of the present invention is to provide a method and device for extending superframe frame synchronization in a T1 system, which overcomes the shortcomings of large memory, large device implementation area, and high cost in the ESF frame synchronization method in the prior art, and realizes it with a small memory ESF frame fast synchronization problem in T1 system

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  • Method and device for extended super frame synchronization for T1 system
  • Method and device for extended super frame synchronization for T1 system
  • Method and device for extended super frame synchronization for T1 system

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Embodiment Construction

[0083] Below in conjunction with accompanying drawing, the implementation of the present invention will be described in further detail:

[0084] ESF frame synchronization method of the present invention, as shown in Figure 1, comprises the following steps:

[0085] 1) Initialize the search state storage unit, and set the data in the search state storage unit to an out-of-sync state. The FAS search unit is initialized, and the state in the FAS search unit is set to an out-of-sync state. The frame synchronization control unit is initialized, and the state in the frame synchronization control unit is set to an out-of-sync state.

[0086] 2) Read historical state data from the search state storage unit, and the read address corresponds to the serial number of the serial input data.

[0087] 3) According to the input ESF serial data, historical state data, and re-search FAS indication signal, the FAS search unit performs state transition and outputs the current state.

[0088] 4...

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Abstract

The method includes steps: initializing the memory unit of search mode (MUSM), the search unit of frame alignment pattern (FAP), and frame synchronous control unit; reading out data of history state from MUSM according reading addresses corresponding to sequence number of the serial input data; based on inputted serial data of expanded supreframe, data of history state, and re-searched FAP indicator signal, the method carries out state transition for the search unit of FAP, and outputs current state; storing data of current state to MUSM at memory address identical to addresses for reading data of history state; based on the search unit of frame alignment pattern, the frame synchronous control unit outputs out current data of state, converts state, and determines whether frame Synch of the expanded supreframe is reached, and outputs the frame alignment indicator. Features are: using few memories, small area of the implementing device, and quick frame Synch.

Description

technical field [0001] The present invention relates to a method and device for ESF frame synchronization, in particular to a method and device for ESF frame synchronization in receiving and framing T1 pulse code modulation data (PCM) in the communication field. Background technique [0002] In prior art digital transmission equipment, the receiving equipment must be able to automatically recognize the frame alignment pattern, which is used to distinguish the beginning and end of each frame of data. The process of automatically recognizing the frame alignment pattern is also known as frame recovery or frame synchronization. [0003] Frame synchronization includes frame search and frame loss monitoring. Frame search is used to detect the start position of the frame, and frame loss monitoring is used to monitor whether the sending and transmission data between devices are out of sync. When frame out of sync is detected, frame search should be re-executed. [0004] The T1 fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
Inventor 尹辉成守红
Owner SANECHIPS TECH CO LTD
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