Re: FN-FORUM: Anyone home? (BT problems and other smalltalk)

date posted 19th May 2005 11:45

Marc Wilson wrote:

> Does anyone actually know the detailed gen on this?

I'll give you my best educated guess.

normal phones just put the ringing circuit back on the line when you
replace the handset - the resistance[1] of that most likely lets the
exchange know that there is still a phone at the other end and the call
remains in play...

digital phones are signalling the base station to hang up...

maybe the base station doesn't "hang up" in quite the same way...

there are all sorts of new signals going up and down the line since my
days as a BT engineer.

Digital exchanges were "new" and I helped install the cable for the
first live pilot fibre-optic... (so it was a while ago)



[1] probably impedance is the proper technical term...



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