Nortel Networks Remote Gateway 50 - Manual (Page 50)

Page 50 of 258 Bandwidth Management
553-3001-207 Standard 2.00 January 2006
Introduction
CS 1000 supports Bandwidth Management on a network-wide basis so that
voice quality can be managed between multiple Call Servers.
Bandwidth management allows for codec selection and bandwidth limitations
to be placed on calls, depending on whether the calls are intrazone or
interzone.
Adaptive Network Bandwidth Management is an enhancement of Bandwidth
Management in which Quality of Service (QoS) metrics are used to
automatically lower available bandwidth.
Codec negotiation
Codec refers to the voice coding and compression algorithm used by DSPs.
Each codec has different QoS and compression properties.
IP Peer Networking supports the per-call selection of codec standards, based
on the type of call (interzone or intrazone). IP Peer Networking supports the
following codecs (with supported payload sizes in parentheses, with the
default value in bold):
• G.711 A/mu-law (10 ms, 20 ms, and 30 ms)
• G.729 A (10 ms, 20 ms, 30 ms, 40 ms, and 50 ms)
• G.729 AB (10 ms, 20 ms, 30 ms, 40 ms, and 50 ms)
• G.723.1 (30 ms) (though it can limit the number of DSP channels
available)
• T.38 for fax
Note: The G.XXX series of codecs are standards defined by the
International Telecommunications Union (ITU).
IMPORTANT!
Once all bandwidth is used, any additional calls are blocked or rerouted.
Keep this in mind when designing and implementing Network Bandwidth
Management.