Correct Answer and Feedback
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)
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)
Here is the answer to paragraph 7 on page 3-5:
Determine the busy hour call-minutes.
22 (# of subs) x 8 (ACR) x 6 (AHT) = 1056 CM
Determine the total amount of traffic offered.
1056 CM x (.35 + .45) = 844.8 CM
Determine the distribution of offered traffic.
844.8 CM x .60 (Ke) = 506.88 CCS
Determine the desired overflow.
506.88 CCS x .10 = 50.688 CCS
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.)