[EMAIL PROTECTED] wrote on 10/16/2005 07:49:38 AM:
> Here's a couple of ways to determine levels...
>
> 1. using the model 4 transmission test set, attach the tone generator
> to one analog pstn line and the transmission level test jacks to a
> second pstn line. Dial from one line to other and measure the tone.
> Divide by two, and the result is the loss associated with a single
> analog pstn line from your location to your central office.
Remember, I'm not working with simple POTS lines. I've got an Adtran TA 612 providing CO lines from a T1. There is nothing that says that the RX and TX settings on the Adtran are the same... Therefore, just dividing by 2 won't work.
Also, couldn't there be an issue on standard POTS lines where the effect upon a singnal between TX and RX is different?
It seems you're just exchanging one set of assumptions for another. But you're the expert! :)
> 2. use one of those analog pstn lines to dial the distant milliwatt
> generator (regardless of where its located), and measure the level
> of the tone. Subtract the loss determined from step #1 and now you
> have the loss associated with facilities interconnecting your central
> office all the way to the distant milliwatt generator.
This doesn't address the problem above, correct?
> The end result will be whatever loss values you measure/calculate,
> you'll still have to play around with the rxgain & txgain to
> minimize the echo while also maximizing the audio levels. The
> process will become a _qualitative_ eval process, not a quantitative
> one. It doesn't make any real difference which tools you use to get
> there or exactly where the milliwatt generator happens to reside.
So how important or valuable will getting a milliwatt test number be?
Tim Massey
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