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How call setup works in PSTN?

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by saxenak02 Nov 27, 2007 last reply Nov 28, 2007

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Hi all,
I'm lookin to find out how the signals actually travel in a normal PSTN (not DSL). At what point does it convert into digital(not sure whether it does)and what modulations the circuit uses to transfer the signal across?
thanks

2 replies

by saxenak02 Nov 27, 2007

Clarifications

by adelacuesta Nov 28, 2007

The signal from the phone (your house) to the telephone exchange is analog. DTMF/hook signaling is used. It is then converted into digital (PCM) in the switching central office prior to transmission and vice versa.

Further reading you can find here
http://en.wikipedia.org/wiki/PSTN
http://www.itu.int/rec/T-REC-G/en

hth,
Alex

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