International Organization for Standardization

Information Technology - Telecommunications and Information Exchange between Systems - Twisted Pair Multipoint Interconnections - Second Edition
 N ISO/IEC 8482

Annotation

This International Standard specifies the physical medium characteristics for

- twisted pair multipoint interconnections in either 2-wire or 4-wire network topology in order to provide for half duplex or duplex data transmission capability, respectively;

- a binary and bi-directional signal transfer of the interconnected endpoint systems;

- the electrical and mechanical design of the endpoint system branch cables and the common trunk cable, which may be up to 1 200 m in length;

- the component measurements of the integrated circuit type generators and receivers within the endpoint systems;

- the applicable data signalling rate up to 12,5 Mbit/s.

The defined electrical component characteristics and measurements are in close conformance with the twisted pair point-to-point characteristics given in ITU-T Recommendation V.11.

This International Standard does not describe a complete physical interface and has no functional interface characteristics, such as

- number of interchange data and control circuits;

- type, size and pin allocation of the endpoint system and branch trunk cable connectors:

- data and control signal encoding;

- time relations between signals on the interchange circuits;