Item

Correct Answer and Feedback

9

G. LES

A switchboard that has more than one possible path in or out for all traffic. This

switchboard may or may not provide tandem service. (page 3-2, para 1f)

10

A. Round the value up

As a rule of thumb, always round up to the value when the answer falls between

values. (page 3-5, para 6a)

Step 1.

Determine the busy hour call-minutes.

22 (# of subs) x 8 (ACR) x 6 (AHT) = 1056 CM

Step 2.

Determine the total amount of traffic offered.

1056 CM x (.35 + .45) = 844.8 CM

Step 3.

Determine the distribution of offered traffic.

844.8 CM x .60 (Ke) = 506.88 CCS

Step 4.

Determine the desired overflow.

506.88 CCS x .10 = 50.688 CCS

Step 5.

Determine the number of trunks needed.

506.88 CCS need to be rounded up to 510 CCS

50.688 CCS need to be rounded up to 61 CCS as the desired overflow

The correct answer is 16 trunks needed. (Refer to Table 3-1.)