SFI

・SerDes Framer Interface is abbreviated as SFI. Some commonly used SFI variants include:

SFI-4: SerDes Framer Interface Level-4
SFI-5: SerDes Framer Interface Level-5

SerDes Framer Interface Level 5 or SFI-5 is a standardized Electrical Interface standard by the OIF for connecting a Sonet Framer component to an optical SerDes for OC-768 (40 Gbit/s).[1] Electrically, it consists of 16 pairs of SerDes channels each running at 3.125Gbit/s which gives an aggregate bandwidth of 50Gbit/s accommodating up to 25% of Forward Error Correction

・OIF
Optical Internetworking Forum
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The Optical Internetworking Forum (OIF) was organized to facilitate and accelerate the development of next-generation optical internetworking products. The OIF produces Electrical, Tunable Laser, Very Short Reach Hardware Interfaces. It also has produced a UNI and NNI software interface Interoperability Agreements. These agreements enable equipment manufacturers to lower their time to market and development cost by enabling a robust, multi-vendor ecosystem. It also lowers the total cost of ownership of systems based on their interoperability agreements by enabling investments in test and verification infrastructure as well as enabling competition.