OMCI framing device and framing method for XGPON OLT

Abstract

The invention provides an OMCI framing device and a framing method for an XGPON OLT, and relates to the field of communication, and the device comprises a DMA write control circuit; a MIC calculationreading control circuit which is connected to an MIC computing OMCI frame data caching and an MIC computing OMCI frame description FIFO reading port and is used for controlling the MIC calculation OMCI frame data cache and the reading process of the MIC calculation OMCI frame description FIFO reading port, and outputting a corresponding OMCI data frame with a correct MIC value and a frame description after obtaining the MIC value through calculation; and an OMCI frame rewriting circuit which is connected with the output end of the MIC calculating and reading control circuit and is used for rewriting the corresponding OMCI frame content into the OMCI frame data cache and the OMCI frame description FIFO. The writing process of the DMA data block output at a high speed is controlled, so thatcontinuous high-speed processing of the data block is ensured, and disorder and blockage are avoided; even if the CPU sends a plurality of OMCI frames in the DMA data block, a small amount of errors of mismatching of original frame length description and actual frame length occur, and the OMCI frames can still recover to be normal in subsequent sending and keep robustness.

Description

technical field [0001] The invention relates to the communication field, in particular to a framing circuit for sending OMCI (ONU management and control interface) frames through a CPU in the XGPON access field. Background technique [0002] In PON (Passive Optical Network, Passive Optical Network), OLT (Optical Line Terminal, Chinese name is Optical Line Terminal) is a terminal device used to connect to an optical fiber trunk. The PON uses optical fiber to connect to the OLT, and then the OLT is connected to the ONU (Optical Network Unit, the Chinese name is the optical network unit. Finally, the ONU provides data, IPTV (ie, interactive network television), voice and other services to the terminal users. [0003] In order to ensure high-speed, continuous and stable sending of downlink OMCI signaling, the high-speed and robust control circuit will play a very important role in the process of sending instructions from the CPU of XGPON OLT to 256 ONUs. [0004] Chinese patent...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application CN201310080961.3 discloses an XGEM framing device-level framing method at the ONU end in an XGPON system, which is a device for constructing XGEM frames according to the maximum bandwidth of 2.5Gbps in the upstream of the ONU, but this solution is aimed at the ONU. The method and device mainly forward the service message to the OLT quickly after receiving the service message that needs to be forwarded to the OLT, and cannot use the PCIE DMA channel to continuously form OMCI frames with a large bandwidth rate exceeding 1.6Gbps

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