[Asterisk-Users] Sangoma A200D analog card with fxo's

[Rich Adamson]

FYI...

Just installed one of the new Sangoma A200D analog pstn cards with the
hardware echo canceller on a trial basis. The card has four fxo interfaces.

Excellent audio quality, excellent echo cancelling, and excellent audio 
levels.

The four pstn lines at this location are rather long analog loops that
have rather long echo trails. I started with a pair of x100p's a couple
of years ago, swapped those out for one of the first TDM04b cards, had
the TDM04b replaced with a later revision (H), and have always had at
least some echo on pstn calls.

Our pstn lines have a -7.1 measured loss from the CO's milliwatt generator.
I've configured this new card with gains of 7.0 db to compensate for that
loss, and audio level is now extemely good.

Presumably the Sangoma hardware canceller handles much longer echo tails,
and those tails have been completely eliminated.

The card's setup was not exactly clear has the documentation for this
new card is somewhat fragmented across multiple readme's, etc.

Based on about one hour's worth of use, I'd recommend this card over
everything that I've tested. (Testing has included several ata type
devices plus the x100p and tdm card.)

Will be testing analog fax and many other items over the next several
days/weeks.