What is the essential difference between ISDN and the ordinary telephone system (PSTN)?
Answer / silpa
The essential difference between ISDN and the ordinary PSTN system is that ISDN is digital, whereas the PSTN is analogue.
ISDN signals pass as a stream of bits. It is from this digital basis that most of the benefits of ISDN arise: speed, multi-channeling, and the ability to carry many types of calls.
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