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FAQ-How to Understand the Conversion of 8M&2M CMI Coding on the SC2

Publication Date:  2019-07-05 Views:  136 Downloads:  0

Issue Description

The SC2 and SC1 of the OptiX OSN 6800 use the CMI code and can work at either 16M or 4M bit rate. What is the internal processing? How to understand the text "Performs the mutual conversion between the 8 Mbit/s CMI-coded signal and the 2 Mbit/s signal" in the product manual? Where do 8M signal and 2M signal come from? 

Alarm Information


Handling Process

1. The SC2 provides two channels of signals, one is the supervisory signal, and the other is the clock signal.
2. The internal processing of the SC2 is as follows:
In the transmit direction, the SC2 encodes one channel of 8M/2M monitoring signals and one channel of 8M/2M clock signals in the CMI format to obtain 16M or 4M signals.
In the receive direction, it performs the reverse process called CMI decoding. 

Root Cause