Overview
ISO/IEC 10022:1996 - Information technology - Open Systems Interconnection - Physical Service Definition - defines the conceptual Physical Service provided by the OSI Physical Layer to the Data Link Layer. This second-edition international standard specifies the service primitives, parameters and valid sequences that describe how the Physical Layer transfers data over physical media. It is a conceptual service definition (not a product or implementation specification) and is published identically as ITU‑T Recommendation X.211.
Key topics and technical requirements
- Service scope: Defines the Physical Service (PhS) in terms of primitives, parameters and sequences rather than implementation details.
- Service primitives & parameters: Specifies the actions and events (requests, indications, responses) and the associated parameters used at the Physical Service Access Point (PhSAP).
- Physical Connection (PhC) model: Covers PhC identification, one-to-one and multi-endpoint relationships, and distinctions between point-to-point and relayed PhCs.
- Service classes & Quality of Service (QOS): Introduces service classes visible to users and pre-defined QOS characteristics tied to those classes.
- Phases of operation: Defines activation, deactivation and data transfer phases, including primitive sequences for each phase.
- Layer and endpoint models: Models of layer service behavior, point-to-point PhC, relayed PhCs (relay control within PhS provider or controlled from the Network Layer).
- Conventions & abstractions: Uses OSI service-convention abstractions (from X.200/X.210) - purely descriptive, not prescriptive implementations.
- Informative annexes: Additional guidance on internal Physical Layer structure, multiplexing classifications, isochronous transmission, half‑duplex usage, and composite state diagrams.
Practical applications and users
Who uses ISO/IEC 10022:1996:
- Physical Protocol designers - to define services their protocols must provide over physical media.
- Data Link Protocol designers - to understand the guarantees and interfaces the Physical Layer exposes.
- Network architects and system integrators - when mapping OSI layers onto real transmission media or intermediate systems.
- Standards bodies and test labs - as a conceptual reference for interoperability and test-case development (note: the standard itself does not define equipment conformance; conformance is via implementing conformant OSI Physical protocols).
- Academia and training - as a canonical description of the OSI Physical Layer service model.
Related standards
Keywords: ISO/IEC 10022:1996, OSI Physical Service, Physical Layer, PhC, PhSAP, service primitives, Quality of Service, physical protocols, X.211.