76 Bandwidth Management
Figure 20
Effect of a higher CQoS Coefficient
Other configurable coefficients used in the calculation are the QoS
Coefficient (CQoS), QoS Response Time Increase (ZQRT), and QoS
Response Time Interval (ZQRTI). CQoS, Cr,Cd, Cpl, and Cj control the
rate of bandwidth decrease, while ZQRT and ZQRTIcontrol the rate of
bandwidth increase.
The Call Admission Control (CAC) ValidityTime Inter val (CACVT)is used to
control the length of time that records from a Call Server are savedin the
Bandwidth Management table. If there have not been any calls between two
Call Servers within the configured time, the Call Server is removedfrom the
table. For example, if Call Server A has Call Server B in the table, and no
call has been placed between A and B for the CACVT time, then Call Server
A removes all Call Server B records in the table.
Limitations
Virtual Office IP Phones are not subject to bandwidth limitations. They
may not have the correct zone information configured. They can also be
controlled by a Call Server that is not responsible for the particular zone.
Thus, bandwidth management is not possible for these phones.
Feature packaging
The Adaptive Network Bandwidth Management feature requires the
following packages:
QoS Enhanced Reporting (PVQM) package 401
Call Admission Control (CAC) package 407
ATTENTION
Package401, QoS Enhanced Repor ting (PVQM), is required if the R valuefrom
the Phase II IP Phones is to be reported and used in the calculations.
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright© 2007, Nor tel Networks
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