For the purpose of compatibility interconnection of data processing equipment via a Local Area Network using the Token Bus access method, this Standard ECMA-90:
– specifies the electrical and physical characteristics of the transmission Network:
– specifies the electrical characteristics of the connection between Data Terminal Equipment DTE and the transmission Network;
– specifies the functions of the Physical Layer:
– specifies the services provided at the conceptual interface between Medium Access Control sublayer and the Logical Link Control sublayer above it:
– specifies the functions within the Medium Access Control sublayer.