PRETS 300 172-1991
Layer 3 Protocol for Signalling Between Exchanges of Private Telecommunication Networks for the Control of Circuit-Switched Calls

Standard No.

PRETS 300 172-1991

Release Date

1991

Published By

ETSI - European Telecommunications Standards Institute

Status

Be replaced 2014-04

Replace By

PRETS 300 172-1992

Latest

PRETS 300 172-1995

Scope

This standard defines the Layer 3 protocol for signalling for the support of circuit mode bearer services (used either on their own or in support of teleservices) at the Q reference point between private Telecommunication Network Exchanges (PTNX) connected together within a Private Telecommunication Network (PTN). The Q reference point is defined in ENV 41004. Service specifications are produced in three stages and according to the method specified in ENV 41005. The definition of signalling protocols is stage 3 of the method. Stage 1 and 2 specifications of the basic circuit mode bearer services are to be found in ETS 300 171. The protocol defined in this standard satisfies the requirements identified by the stage 1 and 2 specifications in ETS 300 171.

PRETS 300 172-1991 history

• 1995 PRETS 300 172-1995 Private Integrated Services Network (PISN); Inter-Exchange Signalling Protocol; Circuit-Mode Basic Services (ISO/IEC 11572 (1994)@ Modified) Third Edition
• 1993 PRETS 300 172-1993 Private Telecommunication Network (PTN): Interexchange Signalling Protocol Circuit Mode Basic Services
• 1992 PRETS 300 172-1992 Private Telecommunications Network (PTN); Inter-Exchange Signalling Protocol Circuit Mode Basic Services
• 1991 PRETS 300 172-1991 Layer 3 Protocol for Signalling Between Exchanges of Private Telecommunication Networks for the Control of Circuit-Switched Calls