ISO/IEC 15507:1997 PDF

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — PINX clock synchronization

First page of standard ISO/IEC 15507:1997

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Title (English):

ISO/IEC 15507:1997

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — PINX clock synchronization

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: November 27, 1997
Edition:: ISO/IEC IS 15507 edition 1 version 1
ICS:: 33.040.35

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Description (English):

This International Standard specifies the signalling protocol for the support of clock synchronization (SYNC-SIG) between Private Integrated Services Network Exchanges (PINXs) connected together within a Private Integrated Services Network (PISN). This protocol supports the synchronization of a PISN using the different sources of clocks available to each PINX. The protocol is based on the method of synchronization described in annex F of the International Standard ISO/IEC 11573. This International Standard is applicable to PINXs which tan be interconnected to form a PISN.

Technical details

Technical committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
SKU: ISO/IEC 15507:1997

Abstract

Overview

ISO/IEC 15507:1997 defines the signalling protocol (SYNC‑SIG) used to support clock synchronization between Private Integrated Services Network Exchanges (PINXs) that form a Private Integrated Services Network (PISN). The standard specifies how adjacent PINXs exchange Application Protocol Data Units (APDUs) over a call‑independent signalling connection to coordinate clock sources and maintain a common timing reference across the PISN. The synchronization method follows the approach described in annex F of ISO/IEC 11573.

Key topics and requirements

Scope and applicability: Applies to PINXs interconnected to form a PISN and to the Synchronization Entity within each PINX responsible for timing.
Signalling transport: SYNC‑SIG messages are carried in the FACILITY information element using the call‑independent (connection‑oriented) transport defined in ISO/IEC 11582.
Operations and coding: The protocol defines ASN.1 operations (e.g., synchronizationRequest, synchronizationInfo) and associated argument/result structures. Information is encoded as Facility IE per ISO/IEC 11582.
States and procedures: Logical states include SYNC‑Idle, SYNC‑Active, and SYNC‑Wait. Procedures specify actions for Requesting (originating) and Destination (terminating) PINXs during normal and exceptional conditions.
Actions supported: Typical synchronization actions include enslavement, holdon, free‑running, and idle states as conveyed in the synchronization messages.
Timers and protection: A protection timer T1 runs at the Requesting PINX in SYNC‑Wait to guard against missing responses; T1 is specified to be not less than 15 s.
Conformance: Implementations must complete the Protocol Implementation Conformance Statement (PICS) proforma (Annex A) to declare supported capabilities.

Applications and who uses this standard

Telecommunications equipment vendors and PBX/PINX manufacturers implement SYNC‑SIG to ensure interoperable clock synchronization across private networks.
Network architects and operators deploy the protocol to prevent loss or misalignment of timed information between exchanges in a PISN.
Test labs and conformance testers use the PICS proforma and message sequence examples (Annex B) and SDL procedural representations (Annex C) for validation.
Developers integrating ISDN-like services in private networks use ISO/IEC 15507 to align synchronization behavior with ISO/IEC 11573 methods.

Related standards

ISO/IEC 11573 - Synchronization methods and technical requirements for PISNs (methodology referenced by 15507)
ISO/IEC 11582 - Generic functional protocol; transport and FACILITY message usage
ISO/IEC 11579‑1 - Reference configuration for PISN Exchanges (PINX)
ITU‑T recommendations (e.g., I.112, Z.100/SDL) referenced for terminology and SDL representations

ISO/IEC 15507 is essential when consistent timing across private exchanges matters - for reliable voice/data transfer, service integrity, and interoperable PISN deployments.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Scope and applicability: Applies to PINXs interconnected to form a PISN and to the Synchronization Entity within each PINX responsible for timing.
Signalling transport: SYNC‑SIG messages are carried in the FACILITY information element using the call‑independent (connection‑oriented) transport defined in ISO/IEC 11582.
Operations and coding: The protocol defines ASN.1 operations (e.g., synchronizationRequest, synchronizationInfo) and associated argument/result structures. Information is encoded as Facility IE per ISO/IEC 11582.
States and procedures: Logical states include SYNC‑Idle, SYNC‑Active, and SYNC‑Wait. Procedures specify actions for Requesting (originating) and Destination (terminating) PINXs during normal and exceptional conditions.
Actions supported: Typical synchronization actions include enslavement, holdon, free‑running, and idle states as conveyed in the synchronization messages.
Timers and protection: A protection timer T1 runs at the Requesting PINX in SYNC‑Wait to guard against missing responses; T1 is specified to be not less than 15 s.
Conformance: Implementations must complete the Protocol Implementation Conformance Statement (PICS) proforma (Annex A) to declare supported capabilities.

Applications and who uses this standard

Telecommunications equipment vendors and PBX/PINX manufacturers implement SYNC‑SIG to ensure interoperable clock synchronization across private networks.
Network architects and operators deploy the protocol to prevent loss or misalignment of timed information between exchanges in a PISN.
Test labs and conformance testers use the PICS proforma and message sequence examples (Annex B) and SDL procedural representations (Annex C) for validation.
Developers integrating ISDN-like services in private networks use ISO/IEC 15507 to align synchronization behavior with ISO/IEC 11573 methods.

Related standards

ISO/IEC 11573 - Synchronization methods and technical requirements for PISNs (methodology referenced by 15507)
ISO/IEC 11582 - Generic functional protocol; transport and FACILITY message usage
ISO/IEC 11579‑1 - Reference configuration for PISN Exchanges (PINX)
ITU‑T recommendations (e.g., I.112, Z.100/SDL) referenced for terminology and SDL representations

ISO/IEC 15507 is essential when consistent timing across private exchanges matters - for reliable voice/data transfer, service integrity, and interoperable PISN deployments.

ISO/IEC 15507:1997 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and who uses this standard

Related standards

Related standards

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