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Call usage rates
Similarly, the term call usage rate (CUR) represents the average number of simultaneous calls
that are carried by a particular facility. In an environment where essentially every call is either
inbound or outbound (such as a call center), CUR and SUR are equal, because there is exactly
one Communication Manager station used in each call. However, in an environment such as a
general business scenario in which some calls are intercom, some calls are inbound, and some
calls are outbound (such as a General Business scenario), CUR and SUR are not equal,
because some calls (the intercom calls) use two Communication Manager stations, and others
(inbound and outbound calls) use only one Communication Manager station.
The next step in the configuration process is to determine the amount of traffic flow between
Communication Manager systems in a network, and between the sites in each individual CM
system. Those traffic flows can be further refined to identify the traffic flows between the various
categories of endpoints within each site. All such traffic flows can be represented in tabular
form.
Communities of interest
The various sites within a particular Communication Manager system comprise communities of
interest (COI), in the sense that the endpoints in each particular site share some common trait
or interest, usually geographical proximity. A COI matrix offers a convenient representation of
the traffic flows between the various sites. For example, consider the COI matrix in
Table 21: 3-site standalone community of interest (COI) matrix
on page 148 for a three-site,
stand-alone Communication Manager system.
In practice, a COI matrix that is associated with a given system is populated with actual traffic
values. In
Table 21: 3-site standalone community of interest (COI) matrix
on page 148, each
diagonal matrix entry represents intrasite call usage, and all other entries represent intersite call
usage. The call usages used to populate the table can be determined empirically or through
theoretical means. In some cases, actual call usage data can be obtained through polling an
existing system. In other cases, it might be appropriate to apply a mathematical model to
estimate the call usages.
Issue 3.4.1 June 2005
147
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