OSI (Open Systems Interconnection)
Multiple Definitions
OSI (Open Systems Interconnection)[1]
A 7-layer hierarchical reference model structure developed by the International Standards Organization for defining, specifying, and relating communications protocols; not a standard or a protocol;
Layer Description
(7) Application: provides interface with network users,
(6) Presentation: performs format and code conversion,
(5) Session: manages connections for application programs,
(4) Transport: ensures end-to-end delivery,
(3) Network: handles network addressing and routing,
(2) Data Link: performs local addressing and error detection and
(1) Physical: includes physical signaling and interfaces.
OSI (Open Systems Interconnection)[2]
A conceptual model that describes how computer systems communicate with each other across LANs and WANs. While it is a defined standard (ISO 7498-1), it is more commonly used as a reference architecture.
Relevant NENA Documents
- ↑ NENA-STA-010.3 (DRAFT) NENA i3 Standard for Next Generation 9-1-1 (DRAFT)
Download - ↑ NENA-INF-016, NENA Emergency Services IP Network Design (ESIND) Information Document
NENA-INF-003, NENA Potential Points of Demarcation in NG9-1-1 Networks Information Document
External References