SerDes Framer Interface

SerDes Framer Interface is a standard for telecommunications abbreviated as SFI. Variants include:

SFI-4 or SerDes Framer Interface Level 4, a standardized Electrical Interface by the Optical Internetworking Forum (OIF) for connecting a synchronous optical networking (SONET) framer component to an optical serializer/deserializer (SerDes) for Optical Carrier transmission rate OC-192 interfaces at about 10 Gigabits per second.[1]
SFI-5 or SerDes Framer Interface Level 5, a standardized Electrical Interface by the OIF for connecting a SONET Framer component to an optical SerDes for OC-768, about 40 Gbit/s.[1] Electrically, it consists of 16 pairs of SerDes channels each running at 3.125 Gbit/s which gives an aggregate bandwidth of 50 Gbit/s accommodating up to 25% of Forward Error Correction

References

Panos C. Lekkas (2003). Network Processors:Architecture, Protocols, and Platforms. McGraw-Hill Professional. p. 423. ISBN 0-07-140986-6.

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