Delay compensation method of LLAS dynamic lossless witchover data bandwidth
A technology for time delay compensation and data, applied in electrical components, transmission systems, etc., to solve the problems of inability to obtain MFI content, different MFI values, and data confusion.
Inactive Publication Date: 2007-12-26
HUAWEI TECH CO LTD
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Problems solved by technology
[0003] At the same time, due to different networking methods, the transmission paths of each VC of the same VCG are different, and there may be delay differences among the VCs of the VCG received at the receiving end at the same time, resulting in different MFI values of different VCs. Processing these data will lead to data confusion and affect the dynamic and lossless switching of the LCAS protocol
The existing delay compensation method does not involve the LCAS bandwidth dynamic adjustment protocol, and cannot obtain the corresponding MFI content. Only by manually configuring the delay parameters, the VCG data with a fixed bandwidth can be cached and the network delay can be eliminated.
In this way, not only time-consuming but also bandwidth adjustment will lead to data loss during switching
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[0024] The present invention is realized by combining FPGA with the requirements of LCAS protocol. The virtual capacity group (VCG) of the present invention includes 16 members (MEMBER), and each member is formed by serial connection of 16 virtual containers (VC). The FPGA of the present invention includes STM data streams, storage units, MFI queues, LCAS protocol analysis, and downstream demapping modules.
[0025] The steps of the present invention are as follows:
[0026] a. The data of each group of VCGs are stored in the storage unit in the order of the VCs;
[0027] b. Adjust the MFI queue of each group of VCG independently, and the adjustment steps are as follows:
[0028] Look for the maximum MFI value on the first position of the MFI queue of the effective SQ, and delete the queue content that is less than the maximum MFI value from the first position until the MFI values of the first positions of the MFI queues of all effective SQs are the same;
[0029] If the m...
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This invention discloses a method for LCAS dynamic harmless switch data bandwidth time delay compensation including: a, each set VCG data are stored in the storage unit in light of VC sequence, b, regulating MF1 array of each, set VCG to search for the maximun MF, on the first bit of the effective SQ MF1 array to cancel contents less than it till all the values are the same, comparing its low 4 bit of aligned MF, they are not oooo, then all SWMF1 contents are discarded till all the 4 bit are equal to 0000, c, processing the MF1 array and judging if the next MF1 is continued to the current, if not, it jumps out of the step and enters into step b.
Description
Technical field: [0001] The invention relates to a time delay compensation method for LCAS dynamic lossless switching data bandwidth. Background technique: [0002] In the SDH transmission service, the main function of LCAS (Link Capacity Adjustment Scheme) is to use SDH overhead bytes to customize the control frame structure and control the VC ( Virtual Capacity, the number of virtual containers), and supports dynamic and lossless bandwidth (that is, the number of virtual containers) switching. Here, the LCAS technology is briefly introduced. LCAS is also called VBA (Variable Bandwidth Allocation, variable bandwidth allocation) technology at first. It can be seen that the LCAS technology has the characteristics of flexible bandwidth and dynamic adjustment. When the user bandwidth changes, the number of Members in the VCG (Virtual Concatenation Group, virtual capacity group) can be adjusted. This adjustment will not affect the user normal business interruption. In additi...
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IPC IPC(8): H04L29/06
Inventor 樊彧
Owner HUAWEI TECH CO LTD