This standard defines the frame format, medium access, services, active hub operation, and the physical layer functions and connectors for a token bus LAN operating at 2.5 Mbps.

This standard defines the method and the frame formats by which a block of data can be transferred utilizing ARCNET independent of the number of octets in the block of data. The standard defines a protocol by which data can be fragmented into one or more ARCNET frames and re-assembled at the receiving station.