Defines a physical-level interface for transmitting digital data at 800 Mbit/s or
1 600 Mbit/s serially over fibre-optic cables across distances of up to 10 km. The
signalling sequences and protocol used are compatible with HIPPI-PH,
ISO/IEC 11518-1, which is limited to 25 m distances. HIPPI-Serial may be
integrated as a host's native interface, or used as an external extender for HIPPI-PH
ports.