Lucent Technologies Definity Audix System Release 4.0 - Manual (Page 31)

Capacity and Sizing
3-1 Voice Ports
DEFINITY AUDIX System Release 4.0
System Description Pocket Reference
585-300-214
Issue 1
May 1999
Chapter 3 — Capacity and Sizing
Lucent Technologies configures the DEFINITY AUDIX system’s capacity
according to the customer’s requirements for the system’s resources.
Customers are divided into two categories of system use:
■ Basic usage customers use the DEFINITY AUDIX system mainly
for call coverage.
■ Advanced usage customers use the system to create and send
messages in addition to call coverage.
Whether customers use the system for call coverage or voice mail, their
requirements for system resources can be divided into five additional
categories—light, medium, heavy, very heavy, and extremely heavy. The
values of two variables broadly determine customers’ system
requirements:
■ Minutes of voice port use per subscriber per day
■ Minutes of voice storage required for each subscriber
Table 3-1 shows the categories of users and their average requirements
for voice ports and voice storage.
Voice Ports
Lucent Technologies configures voice ports for the DEFINITY AUDIX
system in two-port increments. Customers can purchase four, six, or
eight voice ports with Digital Networking, or up to12 voice ports without
Digital Networking. Lucent Technologies ships the system with four
voice ports unless the customer orders additional ports.
The DEFINITY AUDIX system’s voice port capacity is measured in
Erlangs . An Erlang is a mathematical representation of one busy port.
The number of Erlangs a system can carry equals the average number
of ports in use. The number of Erlangs the system can carry will vary
according to its Grade of Service (GOS).
Table 3-1. Average System Requirements per Subscriber
Daily voice port
usage (Minutes) Basic voice storage
(Minutes) Advanced voice
storage (Minutes)
Light 2 1.3 2.0
Medium 4 1.9 2.8
Heavy 6 2.3 3.4
Very heavy 8 2.6 3.9
Extremely heavy 10 3.0 4.5