Eric "ManxPower" Wieling wrote:
I'm a fan of Adtran Total Access (TA) 750s. They are so cheap on eBay that you can get two of them used for less than the cost of a new one. Follow the standard things for not getting ripped off on eBay, of course.
The TA750s are nice indeed - they're built like tanks, and they can be configured with all sorts of different interfaces. However, be aware that the FXO cards are sensitive to RF interference. Standard DSL line filters will eliminate the interference, though. I live about three miles from a 50 kW AM transmitter, and the filters are vital.
Aside from eBay, there are used-equipment vendors that provide refurbished cards and such at reasonable prices. I got my FXO card that way when I couldn't find any on eBay. FXOs are a bit expensive, though, and that goes for eBay or vendors.
On FXS ports, avoid using the automatic line impedance setting. In my experience, it would eventually guess wrong; the phones would work fine for a while, then randomly become incredibly loud. On checking, I discovered that the TA750 was picking 900 ohm+2.16uF complex impedance instead of plain 900 ohm. Once the FXS ports were forced to 900 ohm, there were no further problems.
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