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On 2007-04-18 KxkVh.1188$Da6.602@trnddc02 said:
The employer should at least acquire a basic telephone line
simulator as well. The basic units are only a couple of hundred
dollers. The advanced units where one can simulate all kinds of
signal degradations possibly experienced are in the tens of
thousands of dollars. If they are seriously in this business, they
should know that their competitors do this. I have done this kind
of work occasionally and still keep a TLS in the lab.
I would agree with Bob here. All sorts of things can happen
to that signal between telephone sets while on its journey
through switches and along miles of wire, through cell phone
repeaters, etc.
From my limited experience with dtmf decode problems I've
found that you can get everything humming on the bench, but
as soon as you deploy this thing at the almost inaccessible
relay site on a mountaintop or in that locked closet on the
upper floor of the high rise office building or at the
broadcaster's transmitter site where you can't get in but
occasionally the problems will show themselves immediately.
All sorts of neat little noise sources from rf interference
and other causes travel with the wanted audio signal
through all that equipment.

I"d strongly suggest they acquire one of these simulators
for their testing facility.



Richard webb,
Electric Spider Productions
Replace anything before the @ symbol with elspider for real
email address.



Great audio is never heard by the average person, but bad
audio is heard by everyone.