Services and Protocols of the Data Link Layer
Article Abstract:
A Data Link Control protocol is a set of rules that governs the interchange of information and user data over a communications link. These protocols are at Layer 2 of the Reference model for Open Systems Interconnection (OSI). Data Link functions include initialization, identification, synchronization, error and sequence control, and link management. The purpose of the Data Link in the OSI model is to overcome inherent limitations in the interconnecting medium to provide services to the Network Layer. Protocols of Data Links are either character-oriented protocols that use a subject of another code set or bit-oriented which are based on the use of positionally located fields. Diagrams of the old and new Data Link protocols are given.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1983
User Contributions:
Comment about this article or add new information about this topic:
Services and Protocols of the Physical Layer
Article Abstract:
As the layer which interfaces with the transmission medium, the Physical Layer of the Open Systems Interconnection (OSI) model must activate and deactivate physical connections to other entities. Descriptions of Physical Layer architecture systems are contained in the CCITT Draft Recommendation X.211, Physical Layer Service Definition, and physical Layer protocols of the Integrated Services Digital Networks (ISDN). Widely used older standards and specifications include X.21, V.24, and V.54. Standardization in basic tests, such as loop tests, is becoming more important as automatic testing advances. Physical layer characteristics are illustrated in tables and diagrams.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1983
User Contributions:
Comment about this article or add new information about this topic:
OSI Session Layer: Services and Protocols
Article Abstract:
The Session Layer of the Open Systems Interconnection (OSI) provides functions for the Session Service user to manage and control the dialoque between the two Session Service users. An abstract Session Protocol Machine (SPM) performs all required service or protocol operations. A session connection is made up of a session connection establishment phase, a data transfer phase, and a connection release phase. Five examples of protocol exchanges are illustrated. Tables list session service primitives and Session Protocol Data Units.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1983
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Prolog to: Services, Architectures, and Protocols for Space Data Systems: a tutorial introduction to the paper by Helgert
- Abstracts: Wave propagation and scattering in random media and rough surfaces. Wave Propagation Through Random Media: Contributions from Ocean Acoustics
- Abstracts: A comparison of homogeneous hierarchical interconnection structures. The Special Issue on Open Systems Interconnection (OSI)- New International Standards Architecture and Protocols