Rich Adamson wrote:
One way is to buy a relatively inexpensive analog transmission test
set ($400 US). Most have a tone generator and level meter built in.
You didn't mention which country you're located in, but ensure whatever
test set you purchase, that it supports the line impedance in use by
your telco.
The inexpensive test sets won't function with digital circuits, however
by using something like a cisco ata186 (with a known rx & tx loss),
one can use the analog test set to measure almost anything going on
with asterisk and the pstn.
Most US telco's have a milliwatt generator and quiet termination box
attached to some local telephone number. Many of the US telco's
encourage their installation people to use the test sets to access those
resources for new pstn line installations to verify end to end functions.
Its usually fairly easy to obtain the telephone numbers assigned to
those boxes and use them to measure pstn loss, noise, etc.
The Triplett Model 4 is one model. There are many others.
What's wrong with a little software for * to do all of the above and far
more without cost or inconvenience?
Regards,
Steve
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