4GLOSSARY
multiplex
In this user guide, multiplexing means to take packets from several sources and interleave them into one connection. For example, packets from data, voice, and video sources can be fed down one connection.
NNI
Network Node Interface — Sometimes known as
OAM
Operations and Maintenance — A set of administration and supervisory actions regarding network performance monitoring, failure detection and system protection. Special type cells are used to carry
Octet
8 bits or 1 byte.
OC-n
Optical
Payload
Part of the ATM cell, it contains the actual information to be carried, and occupies 48 bytes. Also see PTI.
PTI
Payload Type Identifier — A
PVC
Permanent Virtual Circuit — A virtual connection established by network management between two points that is permanently available.
routing
A network management function responsible for forwarding packets from their source to their destination. A number of routing algorithms exist to suit different network topologies and requirements.
SAR
Segmentation and Reassembly — Partitions (segments) information frames into cells at the source and reassembles these cells back into information frames at the destination. These activities occur at the lower half of the AAL. It inserts the data from the information frames into the cell. It adds any necessary header or trailer bits to the data and passes the
SDH
Synchronous Digital Hierarchy — A hierarchy that determines signal interfaces for very high speed digital transmission over optical fiber links.
SNMP
Simple Network Management Protocol — A standard defined for handling management information.
