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Port Sizing
November 2004
Avaya Modular Messaging Concepts and
Planning Guide
12-21
Port sizing without using Modular Messaging offers
Planners that have sufficient prior experience in planning and
implementing messaging systems may prefer to carry out the port sizing
exercise without referring to the Modular Messaging offers.
This section provides guidelines and calculations that planners can use to
make estimations such as traffic generated during the busy hour, port
usage, storage capacity, additional text-to-speech resources, and so on.
Concepts a planner must know
Before a planner estimates port requirements, a planner must be familiar
with the following concepts:
Busy hour Busy hour is the one-hour period of the day when traffic intensity is the
highest.
Suppose that during the busiest day of a business week, a total of 3,500
calls are received. The hour between 9:00 a.m. and 10:00 a.m experiences
the heaviest traffic, with 490 incoming calls. This makes 9:00 a.m. to
10:00 a.m. the busy hour.
Another way of expressing busy hour traffic is as a percentage of total
daily traffic. In the example above, 490 busy hour calls is 14% of the
3,500 calls received for the day.
Determining the
busy hour
Most switches can generate traffic reports that provide statistics on a
weekly, daily, or hourly basis. Usually these reports break up the traffic
statistics by type of call, for example, incoming calls, outgoing calls, and
calls to specific hunt groups. These reports can be used to determine what
the specific traffic patterns are and when the busy hour occurs. If traffic
statistics are not available, an educated guess at busy hour traffic is
required. The default planning assumption is 14%.
When calculating the busy hour, planners must realize that the busy hour
for different divisions or user groups may vary. For example, in an
organization that has 1,000 employees in the sales division and 2,000
employees in the technical support division, the busy hour for the sales
division may be different from that of the technical support division. It is
important to calculate the busy hour for the entire organization.
Units of
measurement for
busy hour traffic
Busy hour traffic is normally expressed in minutes, Erlangs, or Centum
Call Seconds (CCS), using the formula:
Busy hour traffic in Erlangs = [Calls during busy hour x Average duration
of each call] /3600
For example: