Cause why the rate of FE services is 125 Mbit/s but not 100 Mbit/s as specified in standards

When a board that has FE optical ports receives FE services, the port rate is 125 Mbit/s. The rate, however, needs to be converted using the 4B/5B encoding scheme. The rate will become 100 Mbit/s after the conversion is complete.

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