Telecommunications Questions and Answers
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Q - 3 What action is taken when the processor under execution is interrupted by a non-maskable interrupt?
Ans- Processor serves the interrupt request after completing the execution of the current instruction.
a) Processor serves the interrupt request after completing the execution of the current instruction.
b) Processor serves the interrupt request after completing the current task.
c) Processor serves the interrupt request immediately.
d) Processor serving the interrupt request depends upon the priority of the current task under execution.
Q - 4 How many T1 facilities the company needs between its office and the PSTN if it has 47 digital telephones, each operating at 64kbps
Ans- Need 4 T1's.
3 low-speed video machines, each operating at 384kbps
1 interactive video system, requiring 1.536 mbps.
Each T1 can accomodate 28 channels.
► 47 digital channels
► 3 low speed V.machines at 384 kbps.
► 1 interactive video systemat 1.536mbps.
So total=47+6+24=89 channels
each T1 requires 1 synchronizing channel & 1 signalling channel.
So 4 T1 requires 8 channels.
4T1's =112 channels-96 channels=15 channels(remains free)