1. All cost of PSTN are allocated on the basis of per ------ basis.
(A) Line
(B) Node
(C) Call
(D) Switching
2. Switching units basic types are:
(A) 4
(B) 3
(C) 2
(D) 5
3. Subscriber lines are connected at ---------.
(A) Line Card
(B) Route Switch
(C) Concentrator Switch
(D) a & b
4. Call between subscribers of different exchanges are routed through …
(A) a & b
(B) Line Card
(C) Concentrator Switch
(D) Route Switch
5. PCM is a technique of ------
(A) Switching
(B) Transmission
(C) D/A Conversion
(D) A/D Conversion
6. PCM frame size is -------
(A) 115 μs
(B) 125 μs
(C) 120 μs
(D) a & b
7. Unit of telephone traffic is ------
(A) Calls/Hour
(B) Calls/Minute
(C) Erlang
(D) PPM
8. Basic rate of ISDN is ……..
(A) Copper & Fiber
(B) 30B + D
(C) Copper
(D) 2B + D
9. Delay is introduced in -------------------
(A) Space switching
(B) Time switching
(C) Frequency
(D) WAN
10. DSL stands for:
(A) Double Space Line
(B) Digital Subscriber Line
(C) Double Side Line
(D) a & b