Measure Intranet Qos; Qos Evaluation Process Overview; Set Qos Expectations - Nortel 1000 Fundamentals

Use the ESN TGAR, NCOS, and facility restriction levels to keep general
modem traffic off the IP Trunk 3.01 (and later) route.

Measure intranet QoS

End-to-end delay and error characteristics of the current state of the
intranet can be measured. These measurements help set acceptable QoS
standards when using the corporate intranet to transmit voice services.

QoS evaluation process overview

There are two main objectives when dealing with the QoS issue in an IP
Trunk 3.01 (and later) network:
1. to predict the expected QoS
2. to evaluate the QoS after integrating IP Trunk 3.01 (and later) traffic
The process for either case is similar; one is without IP Trunk 3.01 (and
later) traffic and one is with. The differences are discussed in this section.
In the process, it is assumed that the PING program is available on a PC, or
some network management tool is available to collect delay and loss data
and access the TLAN subnet that connects to the router to the intranet.
1. Use PING or an equivalent tool to collect round-trip delay (in ms) and
2. Divide the delay by 2 to approximate one-way delay. Add 93 ms to
3. Use a QoS chart, or
4. If a customer wants to manage the QoS in a more detailed fashion,
5. If the QoS objective is met, repeat the process periodically to make sure

Set QoS expectations

The users of corporate voice and data services expect these services to
meet some perceived QoS, which in turn influences network design. The
goal is to design and allocate enough resources in the network to meet
users' needs. QoS metrics or parameters are what quantifies the needs of
the "user" of the "service".
Copyright © 2007, Nortel Networks
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into the intranet
loss (in%) data.
adjust for ITG processing and buffering time.
(page 149) on Table 33 "IP Trunk 3.01 (and later) QoS levels" (page
149), to predict the QoS categories: excellent, good, fair or poor.
re-balance the values of delay compared to loss by adjusting IP Trunk
3.01 (and later) system parameters, such as preferred codec, payload
size, and routing algorithm, to move resulting QoS among different
categories.
the required QoS is maintained.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Table 33 "IP Trunk 3.01 (and later) QoS levels"
Measure intranet QoS 139