Descrambling code method and apparatus thereof for SDH system

A descrambling and scrambling technology, applied in the field of optical fiber communication, can solve problems such as subsequent processing of unfavorable signals, unsuitable for high-speed systems, calculation of multiple combinational logic, etc., to achieve the effect of being conducive to design, simple solution, and reducing clock frequency

Inactive Publication Date: 2006-01-11
KONKA GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this algorithm is applied to actual design, it is only suitable for parallel solutions with lower digits, such as 8-bit and 32-bit; but when it comes to 128-bit parallel processing, it needs complicated calculations and brings more combinational logic, thus Causes a large delay, which is not conducive to the subsequent processing of the signal, and is not suitable for high-speed systems of 40G or above

Method used

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  • Descrambling code method and apparatus thereof for SDH system
  • Descrambling code method and apparatus thereof for SDH system
  • Descrambling code method and apparatus thereof for SDH system

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Embodiment Construction

[0022] The descrambling device includes a scrambler and a decoder. The scrambler is used to scramble the data when the network node outputs the data, and the decoder is used to descramble the data after the network node receives the data. Generally, each node has both a scrambler and a decoder. The scrambler of the previous node that transmits data and the decoder of the next node that receives data form a pair of corresponding scramblers and decoders. The scrambler and the decoder are the same device, including a scrambling code generating unit and an XOR gate circuit 2. The scrambling code generating unit is a shift register 1 with a bit width of 128 bits, and the XOR gate circuit 2 includes 128 XOR gates. , The shift register 1 is composed of 128 D flip-flops. The output terminal Q of each D flip-flop is used as the input terminal of the previous D flip-flop and outputs at the same time, thus forming a 128-bit sequence to scramble or de- Disturb. And the output terminal of the ...

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Abstract

This invention discloses a method for de-harassing the harass-codes used in the SDH system including a harass step and a de-harass step, in which, the harass step includes: a harass-code device outputs 128 bits of harassing-code series in parallel when each clock pulse arrives, parallel XOR is carried out to the data streams necessary to be output by the harass-codes and network nodes and new data streams after de-harassing are transmitted to the next node. The de-harass step includes: the de-harass device outputs 128 bits of de-harass series in parallel when each clock pulse arrives, parallel XOR is carried out to data streams received by the codes and the network nodes then the necessary information is extracted from the processed dater streams.

Description

【Technical Field】 [0001] The present invention relates to the field of optical fiber communication, in particular to a descrambling method and descrambling device used in an SDH system. 【Background technique】 [0002] With the development of SDH (Synchronos Digital Hierarchy) towards high speed, ITU-TG.707 has proposed a synchronous transfer mode of STM-256 (ie, 40G high-speed system). At the network node, in order to facilitate timing recovery, the STM-N (Synchronous Transport Module) signal is required to have sufficient bit timing content. For this reason, a scrambler is used to prevent the occurrence of long-link 0 or long-link 1 sequences. At the receiving end of the node , Set the same decoder to restore the signal. Such as figure 1 As shown, at the network node, the data to be scrambled is scrambled by a scrambler, and the scrambled data is framed and transmitted through the network. At the next node, the received data is deframed first, and then the decoder is descramble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 刘爱珊
Owner KONKA GROUP
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