Hi guys I have a few telecommunications questions: 1. A tandem switch is used to

Question

Hi guys I have a few telecommunications questions:

1. A tandem switch is used to connect two switches together while a class 5 switch interfaces with the individual subscriber and routes the line side traffic onto the trunk side of the switch.

True or False

2. _____ refers to the busiest calling hour of the day, week, month or year. And _____ refers to the average length of time the subscriber stays on the telephone.

3. If one circuit receives thirty calls and each call lasts thirty seconds, how much of that circuit is being used in CCS?

A. 9

B. 27

C. 0.9

D. 90

E. 2.7

4. If one circuit receives 50 calls and each call lasts 45 seconds, how much of that circuit is being used in Erlang?

A. 0.5

B. 6.25

C. 0.625

D. 62.5

E. 0.18

5. If there is a circuit that is being used 36 CCS then how much of that circuit is being used in Erlang?

A. 1

B. 2

C. 0.1

D. 0.2

E. 0.5

6. If there is a circuit that is being used 0.75 Erlang then how much of that circuit is being used in CSS?

A. 36

B. 25

C. 2.7

D. 27

E. 0.625

7. Establishing a telephone call would be impossible without signaling.

True or False

8. Explain the importance of signaling in the telephone network.

9. Explain how touch-tone dialing sends digits to the switch and write the name given to define touch-tone dialing.

10. Explain how rotary dialing sends digits to the switch.

Thank you!

Explanation / Answer

1)
TRUE
...tandem switch is used to connect two switches and class 5 switch interfaces individual sunscriber
interfaces.

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2)
busy hour , seasonal hour

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3) 3x30 = 90 seconds

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4) total seconds = 50x45 = 2250
generally erlang shows in hours
so 2250 sec = 2250/3600 = 0.625

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5)ccs = 36xErlang
so ccs = 36/36 = 1

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6) ccs = 36xErlang
ccs = 36x0.75 = 27
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7) TRUE
we must requires signalling
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8)
signaling is the exchange of information between involved points in the network that sets up, controls, and terminates each telephone call
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9)
A system of telephone dialing in which each digit is transmitted as a tone or combination of tones of specific pitch.

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10)
The frequency of pulses is determined by the number on the
dial which the caller selects, with the user manually turning the dial to a fixed point with their finger before releasing it. This causes the dial to return to its starting position due to an internal recoil spring, while simultaneously generating a series of electrical pulses that interrupt the flow of current on the telephone’s line

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