Specifies the frame format, including delimiters, addressing, and frame check sequence, and introduces timers, frame count, and priority stacks. Gives the medium access medium access control protocol. Describes the services provided by the medium access control sublayer to the LLC sublayer and the network management and the services provided by the physical layer to the medium access control sublayer and network management. Defines services in terms of service primitives and associated parameters. Defines the 1 and 4 megabit per second, shielded twisted pair attachment of the station to the medium including the definition of the medium interface connector. Defines the physical layer functions of symbol encoding and decoding, latency buffering and symbol timing.

BS ISO/IEC 8802-5 : 1998