LESSON 3
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1
D. SES
An SES has only one possible path in or out for all traffic (page 3-2, para 1e)
2
C. Trunk
A trunk is a single circuit between two points (page 3-2, para 1a)
3
E. Trunk group
Trunks which have the same or identical characteristics (destination, signaling, and
traffic route) with the same destination. (page 3-2, para 1b)
4
H. GOS
GOS is the number of calls completed divided by the number of calls attempted.
(page 3-2, para 1d; page 3-3, para 2a)
5
L ACR
Average number of calls made by a switch during a one-hour period. (page 3-3, para
1l)
6
B. OHT
The amount of time a telephone is off the hook or in use. (page 3-3, para 1i)
7
F. Tandem
Traffic that flows through a switch, but does not begin or end at that switch. (page 3-
3, para 1k)
8
J. Erlang
International unit of measurement for traffic intensity. One Erlang is the intensity in
a traffic path continuously occupied. (page 3-2, para 1h)
SS 0029
3-18
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