Nortel Networks Remote Gateway 50 - Manual (Page 254)

Page 254 of 258 List of terms
553-3001-207 Standard 2.00 January 2006
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.