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Parallel frame alignment circuit applied to optical synchronous digital transferring system

A technology of optical synchronous digital transmission system, applied in the field of optical communication, can solve the problems of circuit scale increase, unfavorable system realization, low working speed, etc., and achieve the goal of reducing circuit scale, reducing time delay and improving working speed Effect

Inactive Publication Date: 2005-01-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the systems so far, the data is basically aligned by bit-by-bit or byte-by-byte comparison of the frame synchronization code group, which is not only complicated and difficult to implement, but also has a low working speed; when applied to a higher level In SDH data communication, due to the increase of parallel data bit width, the circuit scale increases significantly, which is not conducive to system implementation

Method used

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  • Parallel frame alignment circuit applied to optical synchronous digital transferring system
  • Parallel frame alignment circuit applied to optical synchronous digital transferring system
  • Parallel frame alignment circuit applied to optical synchronous digital transferring system

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Embodiment 1

[0034] Embodiment 1: The present invention is a frame alignment device used in a parallel frame synchronization system in a high-speed optical synchronous digital transmission system. In the application of STM-64 rate level, if the 64-bit parallel data bit width is used, the working speed of the circuit is 155.520M.

[0035] figure 1 The circuit principle of the invention is shown. Wherein the circuit includes a first D flip-flop 10, an exclusive OR gate 11, a second D flip-flop 12, a third D flip-flop 13, an OR gate 14, an AND gate 15, a fourth D flip-flop 16, a comparison circuit unit 2, The counter unit 3, the binary search unit 4, and the channel selection unit 5, wherein the input 64-bit unaligned data A63-A0 are respectively connected to the input terminals of the first D flip-flop 10 and the XOR gate 11, and the input terminals of the first D flip-flop 10 The output end is connected to the other input end of the XOR gate 11, the output end of the XOR gate 11 is connec...

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Abstract

The justification device includes main parts and connections as following: output end of first D trigger is connected to other end of exclusive-or gate. The output end of the exclusive-or gate is connected to input end of second D trigger. Output end of second D trigger is connected to input end of the fourth D trigger and comparator circuit unit respectively. Output end of the comparator circuit unit is connected to counter unit etc. Output end of the third D trigger is connected to 'EN' end of the fourth D trigger. Output end of the fourth D trigger is connected to binary search unit, and 'D63-DO0' of channel selection unit. Binary search unit is connected to channel selection unit through their relevant ends.

Description

technical field [0001] The invention relates to a frame alignment device used in a parallel frame synchronization system in a high-speed optical synchronous digital transmission system, which belongs to the technical field of optical communication. Background technique [0002] In the modern digital multiplexing and tapping system, in order to ensure that the branching at the receiving end is consistent with that at the sending end, a frame synchronization system must be provided to realize the frame synchronization between the sending end and the receiving end. At present, as the data rate level of optical synchronous digital transmission network is getting higher and higher, the processing of SDH (Synchronous Digital Hierarchy, synchronous digital transmission system) data at the receiving end is generally to pass the high-speed serial data stream received through the optical fiber through the serial Parallel processing at a lower rate after convers...

Claims

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Application Information

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IPC IPC(8): H04J3/06
Inventor 李彧王志功苗澎
Owner SOUTHEAST UNIV
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