[A*UG] local at&t pstn/pots AC terminal impedance values

[Wayne Walker]

On Tue, Sep 30, 2008 at 04:07:51PM -0500, Ryan Vanderwerf wrote:
> Hi, new to the group. I've set up a recent system, and I'm getting a
> lot of echo on a GXP-2000 phone through a PSTN line at the value of 600R-
> 600 ohms.
> My options are:
> 600R - 600 ohms</option>
> 600C - 600 ohms + 2.16uF</option>
> 900R - 900 ohms</option>
> 900C - 900 ohms + 2.16uF</option>
> COMPLEX1 - 220 ohms + (820 ohms || 115nF)
> COMPLEX2 - 270 ohms + (750 ohms || 150nF)
> COMPLEX3 - 370 ohms + (620 ohms || 310nF)
> COMPLEX4 - 600R 270 ohms + (750 ohms || 150nF)
> COMPLEX5 - 320 ohms + (1050 ohms || 230nF)
> COMPLEX6 - 350 ohms + (1000 ohms || 210nF)
> COMPLEX7 - 200 ohms + (680 ohms || 100nF)
> COMPLEX8 - 370 ohms + (820 ohms || 110nF)
> COMPLEX9 - 275 ohms + (780 ohms || 115nF)
> COMPLEX10 - 120 ohms + (820 ohms || 110nF)
> 
> I'm trying to play the the AC terminal impedance values, and I was
> wondering if anyone knew what value the local Austin area AT&T PSTN/Pots
> lines use? I figured I'd ask before trying all of them.
> 
> Thanks
> 
> Ryan Vanderwerf
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Welcome to the group.  It's been very quiet in here for a while.

I just got back from Astricon, but I'm on the backend side of the game
and rarely touch phones or even FXO/FXS ports.

-- 

Wayne Walker

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