1. A means of encoding data to enhance its transmission characteristics.
2. A byte-oriented transmission code specified by FC-FS-2 for 1/2/4/8 GFC, with valid data bytes and special codes encoded into 10-bit Transmission Characters according to the 8B10B encoding.
3. A word-oriented transmission code specified by 10GFC, with 64 bits of data and special codes encoded into a 66-bit transmission unit according to the 64/66 encoding.