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Traffic engineering
198 Avaya Application Solutions IP Telephony Deployment Guide
A seven-site COI matrix analogous to the three-site matrix in Table 25: 3-site standalone
community of interest (COI) matrix on page 184 can be constructed for the network shown in
Figure 64
. A corresponding seven-site, expanded COI matrix, similar to the one in
Table 29:
Expanded COI matrix for a three-site system on page 192, can also be constructed.
However, when multiple systems are networked together, the additional step of engineering the
tie trunk groups must be performed. To do this, the COI matrices are used to determine the
traffic flow between each pair of Avaya systems.
In the network that is shown in Figure 64
, IP Trunk Group 1 carries calls between Sites 1 and 3,
Sites 1 and 4, Sites 2 and 3, and Sites 2 and 4, in addition to a presumably small amount of
overflow traffic that involves other sites. The traffic load that is associated with such calls is used
to size that trunk group. Tie trunk groups are typically sized at either P01 (1% blocking) or P03
(3% blocking). In a system such as the one in Figure 64
, the traffic engineer must account for
overflow traffic. The traditional Wilkinson model is an effective tool for doing so. However, for
systems that have larger numbers of systems in the network, there can be many possible paths
between a given pair of systems. In such cases, determining the hierarchy of paths to consider
for calls between two systems is not always straightforward. The analysis involved in sizing the
tie trunk groups in topologies such as those can be quite complex.
Resource sizing
This section provides a description of the resources that have the potential to be bottlenecks,
and a discussion about how to engineer them. This is the final stage of the design process.
Overview
The primary Communication Manager resources that have the potential to be bottlenecks are:
● the TN799DP C-LAN (Control LAN) circuit packs
● the port network TDM bus pairs
● the TN2602AP IP Media Resource 320 and TN2302AP IP Media Processor circuit packs
● the TN2312BP IP server (IPSI) circuit packs
● the server’s processing capacity
● IP bandwidth.