Avaya C460 manual Protocol Stack, QoS, Query, Redundancy, Repeater

Glossary

Protocol

A set of rules and conventions that governs how devices exchange data, especially across a network. Low level protocols define the electrical and physical standards to be observed, bit- and byte-ordering, the transmission, error detection, and correction of the bit stream. High level protocols deal with data formatting, including message syntax, terminal to computer dialogue, character sets, message sequencing, etc.

Protocol Stack

A layered set of protocols which work together to provide a set of network functions. Each intermediate layer uses the layer below it to provide a service to the layer above.

PSTN

Public Switched Telephone Network. The collection of interconnected systems operated by the various telephone companies and administrations around the world.

PVC

Permanent Virtual Circuit. A permanent, virtual connection established by the network management between an origin and a destination.

QoS

Quality of Service. A measure of performance for a transmission system that reflects the system’s transmission quality and service availability.

Query

The process of extracting information from a database and presenting it for use.

RADIUS

Remote Authentication Dial-In User Service (RFC 2138). A protocol for carrying authentication, authorization, and configuration information between a Network Access Server and a shared Authentication Server.

Redundancy

A duplication of devices, services, or connections so that in the event of a failure, the redundant device, service, or connection can take over for the one that failed.

Repeater

A device that automatically amplifies, restores, or reshapes signals distorted by transmission loss.

Avaya C460 Reference Guide 251