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This part of ISO/IEC 11518 specifies a physical-level, point-to-point, full-duplex, link interface for reliable, flow-controlled transmission of user data at 6400 Mbit/s per direction, across distances of up to 1 km. A parallel copper cable interface for distances of up to 40 m is specified. Connections to a separate longer-distance optical interface are provided. Small fixed-size micropackets provide an efficient, low-latency structure for small transfers, and a component for large transfers.

Specifications are included for:

• automatic retransmission to correct flawed data;
• the format of a small data transfer unit called a micropacket;
• a message structure that includes routing information for network applications;
• end-to-end, as well as link-to-link, checksums;
• the timing requirements of the parallel signals;
• a parallel interface using copper coaxial cable;
• connections to a separate local optical interface;
• a link-level protocol tuned for a maximum distance of 1 km.