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Example 3: Empirical approach for existing systems
Another possible means of populating the COI matrices exists for established systems. In such
cases, the necessary information can be read from traffic reports. This method is particularly
useful for customers who are considering an upgrade from their current equipment.
Expanded COI matrices
So far, all the discussion pertaining to COI matrices has focused on a macroscopic view of sites.
In particular, all the COI matrices presented have dedicated one cell for each pair of sites. In
preparation for
collections of smaller cells that describe the call flows between different communities of
endpoint types within the sites.
One possible partitioning scheme for each site is to create the following three general endpoint
categories:
IP endpoints
Circuit-switched endpoints
PSTN trunks
Consider the COI matrix for a three-site, stand-alone Communication Manager system, as
presented in
Table 21: 3-site standalone community of interest (COI) matrix
suitable expansion of that matrix might take the form of the matrix in
matrix for a three-site system
I represents IP endpoints
C represents circuit-switched endpoints
P represents PSTN trunks
Resource sizing
on page 162, it is useful to partition each such cell into
on page 156 in which
Call usage rates
on page 148. A
Table 25: Expanded COI
Issue 3.4.1 June 2005
155
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