Nortel Networks Remote Gateway 50 manual QoS, Routing

Page 254 of 258 List of terms

PSTN

Public Switched Telephone Network. The international telephone system based on copper wires carrying analog voice data. This is in contrast to newer telephone networks based on digital technologies.

Telephone service carried by the PSTN is often called plain old telephone service (POTS).

QoS

Quality of Service, a networking term that specifies a guaranteed throughput level. One of the biggest advantages of ATM over competing technologies, such as Frame Relay and Fast Ethernet, is that ATM supports QoS levels.

This enables ATM providers to guarantee to their customers that end-to-end latency does not exceed a specified level.

There are several methods to provide QoS, as follows:

•high bandwidth

•packet classification

•DiffServ

•IP fragmentation

•traffic shaping

•use of the platform’s queuing mechanisms

routing

The process of selecting the correct path for packets transmitted between IP networks by using software-based algorithms. Each packet is processed by the algorithm to determine its destination.

SRG50

Survivable Remote Gateway 50. This describes the equipment used to create an IP branch office with a CS 1000 system acting as the main office. The base system for SRG is a Business Communication Manager running BCM 3.6 software.

553-3001-207 Standard 2.00 January 2006