OMCI framing device and framing method for xgpon OLT

Abstract

The invention provides an OMCI framing device and a framing method for XGPON OLT, relates to the field of communications, and includes: a DMA write control circuit; a MIC calculation read control circuit, and a MIC calculation OMCI frame data buffer and a MIC calculation OMCI frame description FIFO reading The port is connected to control the read process of the MIC calculation OMCI frame data buffer and the MIC calculation OMCI frame description FIFO reading process, and after calculating the MIC value, output the corresponding OMCI data frame and frame description with the correct MIC value; The OMCI frame rewriting circuit is connected to the output end of the MIC calculation and read control circuit, and is used for rewriting the corresponding OMCI frame content into the OMCI frame data buffer and the OMCI frame description FIFO. Controlling the writing process of the high-speed output DMA data block ensures the continuous high-speed processing of the data block without disturbance and blockage; even if the CPU sends multiple OMCI frames in the DMA data block, a small amount of original frame length description and actual data appear. The frame length mismatch error can still be restored to normal in subsequent transmissions, maintaining 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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