Best Telecom Voice Gateways Interview Questions
Q – 1 What is the time taken for 1 satellite hop in voice communication?
Ans- The satellite delay for single hop SCPC link is about 525-550ms. But for TDMA network, the delay varies between 550ms – 700ms.
Q – 2 Tell me What is the Max number of satellite hops allowed in voice communication?
Ans- Logically speaking, whatever be the number of hops, the fixed delay should not go more than 150ms (one-way).
Q – 3 Do you know What is the maximal decimal number that can be accommodated in a byte?
Ans- 256
SINCE, 1 BYTE=8 BITS
THE LOGIC IS 2^8=256(2 TO THE POWER OF 8)
Q – 4 Explain At which Frequency VOICE is sampled?
Ans- if you sample a signal in regular intervals of at least twice the highest channel frequency, the sample will contain enough information to accurately reconstruct the signal.
Human Audible Range: 20 – 20,000 Hz
Human Speech: 200 – 9000 Hz
Telephone channel: 300 – 3,400 Hz
Nyquist theorem: 300 – 4000 Hz
Sample size = (2 * 4000) 8000, 8000 * 8 bits =
64,000 bps = 64 kbps
Q – 5 Explain What is the Purpose of PC(Program Counter) in a MicroProcessor?
Ans- Program Counter in a microprocessor (or CPU) is a pointer instruction of the program to tell where the CPU to look for the next instruction.
Q – 6 Tell me What action is taken when the processor under execution is interrupted by a non-maskable interrupt?
Ans- non maskable interrupt r those 2 whom processor must have 2 respond instantly…..
4 maskable interrupts it should complete current instruction n then come over it..
Q – 7 Do you know What is the nominal voltage required in subscriber loop connected to local exchange?
Ans- +48 voltsb) -48 voltsc)
Q – 8 Explain the type of signaling used between two exchanges?
Ans- In Band (Single Frequency, Multi-Frequency (MF), and Dual-Tone Multi-Frequency (DTMF)), Common Channel Signalling (CCS) and Signalling System 7 (SS7) is used Between the exchanges.
But CCS and SS7 are more cheaper than MF.
Q – 9 What is buffering?
Ans- It is the process of temporarily storing the data so that the data is available for some activity (re-sequencing etc.) The result of this is delay in delivery of the packets and hence, variation in speed of packet delivery.