Discussion
Why did digital telephony displace analogue pulse schemes on long routes?
Answer: B
On a long route the decisive property is that each regenerator rebuilds the pulses cleanly, so noise does not accumulate hop by hop - an analogue pulse train degrades steadily with every amplifier. Digital coding needs more bandwidth rather than less, its coders were initially dearer, and it demands far more synchronisation. A scheme can win decisively on one property while losing on three others, which is why the application has to be named before any comparison is meaningful.
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