Nortel Networks NN43001-563 - Manual (Page 112)

112 ITG engineering guidelines
card
AHT=1
0s
AHT=30s AHT=60s AHT=120s AHT=180s
6000 0 1 3 4 8 11
5800 32 1 3 4 8 11
In order to achieve successful VoIP, a minimum amount of bandwidth must
be reserved. Bandwidth is not guaranteed unless QoS mechanisms are
implemented.
Calculate Ethernet and WAN bandwidth usage
Table 17 "Silence Suppression disabled TLAN Ethernet and WAN IP
bandwidth usage per IP Trunk 3.01 (and later) " (page 113)
lists the Ethernet
and WAN bandwidth use of IP Trunk 3.01 (and later) ports with different
codecs with Silence Suppression Disabled. One port is a channel fully
loaded to 36 CCS, where one CCS (Centi-Call-Second) is a channel/circuit
being occupied 100 seconds. 36 CCS is a circuit occupied for a full hour.
To calculate the bandwidth requirement of a route, divide the total route
traffic by 36 CCS and multiply by the bandwidth use. All traffic data must be
based on the busy hour of the busy day.
To calculate resource requirements (IP Trunk 3.01 (and later) ports and
TLAN subnet/WAN bandwidth), traffic parcels are summarized in different
ways:
1. Add all sources of traffic for the IP Trunk 3.01 (and later) network,
such as voice, faxes sent, and faxes received, together to calculate IP
Trunk 3.01 (and later) port requirements and TLAN subnet bandwidth
requirements.
2. For data rate requirement at each route, the calculation is based on
each destination pair.
3. For fax traffic on a WAN, only the larger of either the fax-sent or
fax-received traffic is to be accounted for.
The engineering procedures for the TLAN subnet and WAN are different.
The following calculation procedure is for the TLAN subnet. The modification
required for WAN engineering is included in these procedures.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.