This standard specifies a media-level, point-to-point, 12-channel, full-duplex, electrical/optical interface, with each channel operating at 500 Mbit/s or 1 Gbit/s. Multimode (MM) fiber cables, and single-mode (SM) fiber cables, are used for distances up to1 km when carrying the HIPPI-6400-PH protocol. Differential signals are used on the electrical side.
ANSI X3.184-1993 history
1993ANSI X3.184-1993 Information systems - Fiber-Distributed Data Interface (FDDI) - Single-Mode Fiber Physical Layer Medium Dependent (SMF-PMD)