Nortel Networks NN43001-314 - Manual (Page 76)

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 ZQRTI control the rate of
bandwidth increase.
The Call Admission Control (CAC) Validity Time Interval (CACVT) is used to
control the length of time that records from a Call Server are saved in the
Bandwidth Management table. If there have not been any calls between two
Call Servers within the configured time, the Call Server is removed from 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
Package 401, QoS Enhanced Reporting (PVQM), is required if the R value from
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, Nortel Networks
.