Differences between bit transparent mapping and MAC transparent mapping

Bit transparent mapping (11.1G): 10GE LAN client-side signals are mapped into OTU2e signals by increasing the OTU frame frequency. This mapping method guarantees a desired FEC coding gain and correction capability. However, this method generates a line rate of 11.1 Gbit/s, which is higher than the standard rate of OTU2 signals.
MAC transparent mapping (10.7G): 10GE LAN client-side signals are encapsulated using the GFP-F method and are mapped into OTU2 signals using 10GE MAC frames. This mapping method guarantees a desired FEC coding gain and correction capability and generates a line rate of 10.71 Gbit/s.
Bit transparent mapping (10.7G): 10GE LAN client-side signals are mapped into OTU2e signals by occupying some FEC areas of standard OTU frames. This method makes some FEC areas be occupied to transmit signals, which weakens the FEC/AFEC coding gain and error correction capability. As a result, the rate of line-side signals is 10.71 Gbit/s.

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