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114 Bandwidth Management
Multiple Appearance Directory Numbers (MADN) can exist on different
zones. Calls to an MADN are handled the same as other IP Phone calls,
and are subject to the same bandwidth limitations.
New SNMP alarms are provided to monitor the system. When the
bandwidth limit between zones is reduced below configured levels, an alarm
is raised. A Warning alarm and an Unacceptable alarm, each corresponding
to a drop below a configured threshold, are used. When the bandwidth
returns to normal, the alarm is cleared. If the bandwidth limit reaches
zero, an additional Unacceptable alarm is raised. These alar ms allow the
system administrator to monitor the system and take corrective action
when required.
Adaptive Network Bandwidth Management configuration
parameters
Packet Loss (pl), Jitter (j) and Delay (d) measurements, along with the R
factor (r) in IP Phone 200x Phase II telephones, are used to calculate the
QoS level for the zones. The coefficients for these QoS measurements
— packet loss (Cpl), jitter (Cj), delay (Cd), and the R factor (Cr) — can
be configured and are used to calculate the rate of bandwidth change.
Increasing them from their default values causes the Sliding Maximum to
decrease faster in response to the specific QoS alarm.
The QoS Coefficient (CQoS) can be varied from its default value. Increasing
this value causes the Sliding Maximum to change more rapidly in response
to QoS alarms. However, making this value too large will result in loss
of overall bandwidth, as shown in Figure 36 "Effect of the default CQos
Coefficient" (page 115) below and Figure 37 "Effect of a higher CQoS
Coefficient" (page 115).
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.