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Method and apparatus for computing even-odd check information in communication network

A parity check and calculation device technology, applied in the field of communication network, can solve problems such as inconvenient use, complicated circuit, and rising cost, and achieve the effects of strong versatility, low cost, and convenient use

Active Publication Date: 2008-11-26
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in optical transmission equipment, B3 is calculated separately for each frame structure of SONET or SDH, and different processing methods are selected through configuration. Since there are many frame structures, this will inevitably increase the cost, complicate the circuit, and make it inconvenient to use.

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  • Method and apparatus for computing even-odd check information in communication network
  • Method and apparatus for computing even-odd check information in communication network
  • Method and apparatus for computing even-odd check information in communication network

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Embodiment Construction

[0031] For ease of understanding, terms appearing in the context are explained below.

[0032] SONET and SDH: In 1985, Bellcore proposed the SONET (Synchronous Optical Network) standard, and the American National Standards Institute (ANSI) passed a series of related SONET standards. In 1989, CCITT accepted the SONET concept and formulated the SDH (Synchronous Digital Hierarchy, Synchronous Digital Series) standard, making it a general technical system suitable not only for optical fiber but also for microwave and satellite transmission. It is slightly different from SONET , SDH / SONET defines a set of rates and formats for transmitting optical signals on optical fibers, usually collectively referred to as optical synchronous digital transmission network, which is one of the foundations of broadband integrated digital network B-ISDN, SDH / SONET adopts TDM (time division multiplexing ) technology, which is a synchronous system controlled by a master clock, both of which are used f...

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Abstract

The invention provides a method and a device for computing parity check information of each data block in data stream, which comprises steps of dividing the data block into a plurality of basic data units, then respectively computing the parity check information of each basic data unit, and lastly merging the parity check information of the plurality of basic data units belonging to the same data block to obtain the parity check information of each of the data blocks. By utilizing the method and the device of the invention, computing processes of bit-interleaved parity check bytes B3 in signals of STS-N / STM-M are compatible with each other. Separate or mix computing process of VC-3, VC-3-Xc (SDH protocol is not temporarily supported, but the method and device of the invention are, and X can be less than 3), VC-4 and VC-4-Xc is supported for SDH, and separate or mix computing process of STS-1SPE and STS-Nc SPE (SONET is not supported temporarily for N is less than 3, but the method and the device of the invention support) is supported for SONET. The method and the device of the invention have the advantages of low cost, high versatility and convenient use.

Description

technical field [0001] The invention relates to a communication network, in particular to a parity check calculation device and a method thereof in an optical communication network. Background technique [0002] Bit interleaved parity code (BIP) is a relatively simple check code method, which divides a digital sequence into several digital series (for example, W digital series, W is positive Integer), and then parity code is performed on each number series to obtain a check bit to detect errors in this number series. In this way, W check code bits can be obtained to perform error detection on the entire digital sequence. This encoding method is generally called BIP-W encoding, and the obtained check code is called bit-staggered parity check code. [0003] In SDH's virtual container VC-3 / VC-4 high-order path overhead and SONET's basic synchronous pure load STS-1SPE, a B3 byte is arranged to implement BIP-8 bit interleaved parity code, which is used for Channel error monito...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 匡启成
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD