Device and method for detecting system frame header deviation
A detection system and frame header technology, applied in time-division multiplexing systems, electrical components, multiplexing communications, etc., can solve the problems of small detection range, complex implementation, rough detection, etc., and achieve low cost and low implementation Difficulty, good frame header monitoring effect
Active Publication Date: 2012-07-18
ZTE CORP
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[0004] The present invention overcomes the disadvantages of rough detection, small detection range, and relatively complex implementation in the prior art, and proposes a detection method and device capable of accurately detecting frame header offset
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[0022] The device for detecting system frame head offset of the present invention is composed of the following parts: a modulo M counter, a comparator, and an alarm storage unit. Modulo M counter: The modulo M counter counts cyclically from 0 to M-1, and adds 1 every clock cycle to count the frame data. The total number of frame data can be divisible by the M value. M can be a value of 2 to the nth power. Every time the frame header comes, the modulo M counter is set to a certain value in the range of 0 to M-1, that is, the frame header position is aligned with a certain position in the middle of the counter counting sequence, so that the detection range of the frame header jump can be detected It can be floated to expand the actual detection range. When it is set to M / 2, that is, when it is in the middle of the range from 0 to M-1, it has the largest detection range. In terms of implementation, it is required that when the frame header signal is normal (the frame header doe...
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The invention discloses a device and a method for testing the derivation of a system frame header. The testing device comprises a mode M counter, a comparer, and a warning memory unit; the mode M counter counts cyclically from zero to M-1, the number of clock period between the two data frame headers is integer times of M, a preset value is set between zero to M-1 in the mode M counter, and when the frame header is transmitted to the mode M counter, the counting value is set as the preset value; the comparer, when the frame header arrives, compares the present counting value in the mode M counter with the preset value to obtain the derivation information of the frame header and storage the derivation information of the frame header into the warning memory unit, and the system achieves thederivation information of the frame header by reading out the information in the warning memory unit. Compared with the prior art, the method and the device in the invention are easy to be realized and low in cost, monitor the system frame header well, and provide an effective tool for diagnosing the jumping problem of the system frame header.
Description
technical field [0001] The invention relates to a method and a device for detecting system frame header offset, in particular to SDH transmission system equipment in the communication field. Background technique [0002] The transmission system widely used at present is SDH transmission equipment. In SDH transmission equipment, the commonly used system architecture is that a clock board generates the system clock and system frame header, and transmits them to the service board and the cross-connect board through the backplane, and the service board and the cross-connect board take samples for data exchange with the backplane The frame header position. In the development, debugging and engineering application of service boards, there are many reasons that may lead to bit errors. One of the reasons is that the position of the system frame header sampled by the service board has jumped. Once the position of the system frame header changes suddenly, it will cause If there is a...
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IPC IPC(8): H04J3/06H04J3/16
Inventor 谭江恒
Owner ZTE CORP