VOE2TCDM24L8 | YOKOGAWA | RS layer receiving module

Description

VOE2TCDM24L8 | YOKOGAWA | RS layer receiving module

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In recent years, with the continuous emergence of new services such as high-definition TV, interactive multimedia, mobile TV, and video on demand, VOE2TCDM24L8 users have a growing demand for bandwidth. EPON has been favored by a large number of operators due to its advantages of long transmission distance and large transmission capacity. At the same time, the national policy of integrating the three networks has also provided strong support for the application of EPON technology. The EPON system is an asymmetric system that can have up to 32 data link layers and 1 reconciliation sublayer (RS) at the OLT end; There is only one data link layer and one RS layer on the ONU end. The RS layer is located between the physical layer and the MAC layer, playing a selection role in the downlink direction for data sent from the OLT end, transmitting data belonging to the ONU in the downlink direction, discarding data that does not belong to the ONU, and filtering data. In the upstream direction, it is mainly to add preambles to the frames sent to the opposite end to facilitate the positioning of the opposite end. On the ONU end, according to the RS layer’s functions, it is divided into two parts: reception and transmission. We have proposed corresponding design solutions for these two parts of functions.

VOE2TCDM24L8 detects the frame header (i.e. preamble) of EPON; ② Positioning the SLD domain; ③ Using the location of the SLD domain to locate the CRC domain and verifying that the received values match the CRC calculated using the received data; ④ Use the location of the SLD domain to locate the LLID domain and parse it to determine the destination MAC; ⑤ If the message is not discarded due to incorrect CRC or unknown LLID, then use a normal preamble to replace SLD and LLID, and use SFD to replace CRC domain, and transmit this message to the corresponding MAC; Otherwise, the entire message will be discarded and replaced with a normal frame interval (here we choose to discard the message).

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