Cause why the rate of GE services is 1.25 Gbit/s but not 1000 Mbit/s as specified in standards

When a board that has GE optical ports receives GE services, the port rate is 1.25 Gbit/s. The rate, however, needs to be converted using the 8B/10B encoding scheme. The rate will become 1000 Mbit/s after the conversion is complete.

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