Overview
ISO/IEC 13642:1999 (identical to ITU‑T Rec. X.281) specifies the management information elements for the OSI Physical Layer. It defines the set of Physical Layer Managed Objects and their attributes, relationships and available action-type operations as seen by OSI systems management. The standard focuses on what management information is provided (managed object classes, containment hierarchy, ASN.1 module and object identifiers), not on how physical layer management is implemented.
Key Topics
- Managed object classes: canonical objects specified for the Physical Layer include the Physical Subsystem MO, Physical Entity MO, Physical SAP (Service Access Point) MO, Data‑circuit MO, and Physical Connection MO.
- Containment hierarchy: one Physical Subsystem instance per system contains one or more Physical Entity and Physical SAP instances; Data‑circuit and Physical Connection objects are defined under this hierarchy.
- Relationships and attributes: relationship attributes (e.g., localSapName, userEntityNames) link MOs to each other and to higher layer users. The standard follows GDMO guidelines for managed object definitions.
- Action-type operations: specifies which operations on attributes of Physical Layer MOs are available to OSI systems management (i.e., the management interface actions).
- ASN.1 module and object identifiers: includes an ASN.1 module for encoding and normative allocation of OIDs for managed objects and attributes.
- Event filtering and notifications: recommends minimum event filtering capabilities to control frequent notifications (filter by source managed object class and alarm identifiers).
- Conformance and optional fields: defines conformance requirements and constrained use of OPTIONAL ASN.1 fields to ensure interoperability.
Applications
ISO/IEC 13642 is useful for organizations and professionals who need standardized management visibility into physical network elements:
- Network equipment vendors creating management agents for physical interfaces and media.
- Network management system (NMS) developers mapping device MOs into management consoles and alarm systems.
- Systems and network architects designing interoperable OSI‑based management solutions or integrating legacy OSI management data.
- Standards authors and implementers who define or validate GDMO templates, ASN.1 modules and OID allocations for physical layer management.
Practical uses include fault isolation, event reporting, inventory and configuration of physical interfaces, and providing a consistent management information model for tool interoperability.
Related Standards
ISO/IEC 13642 references and aligns with key OSI and management standards, including:
For implementers, ISO/IEC 13642 is the authoritative model for representing Physical Layer management information in an OSI management environment.