[asterisk-users] SPA3k wired to PAP2 for echo testing

[James Harper]

In case anyone cares, I fixed the problem in the end by RA-ing the unit
and getting another one. Whatever was wrong with it meant that the echo
training just never happened.

With the replacement unit, without having adjusted any gains or
anything, there is initial echo which trains down to nothing in a fairly
short time.

James

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of James Harper
> Sent: Sunday, 5 November 2006 15:37
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [asterisk-users] SPA3k wired to PAP2 for echo testing
> 
> In my seemingly endless search for the cause of echo on my SPA3000, I
> wired it up in the following configuration:
> 
> Analogue Handset <--> (FXS)SPA3000(FXO) <--> PAP2
> 
> And set the Line1 dialplan on the SPA3k to '(<:@gw0>S0)' which means
> that as soon as I pick up the handset I get linked straight through to
> the PAP2, which gives me dialtone.
> 
> Even in this configuration, with my impedance settings set to the
> Australian standard of 220+820||120nf, and the PSTN and PAP2 echo
> cancellers enabled (or not, and all combinations of) I get local echo
as
> soon as I pick up the handset (I hear my voice bounced back to me).
> Surely this shouldn't be??? There is no hybrid involved at all!
> 
> If anyone on this list with a SPA3k (that doesn't have any local echo
> problems on the PSTN port) and an ATA with a FXS port, could they
please
> try the above setup and post the results (including SPA3k hardware and
> firmware versions, and the ATA used)? I wonder if there is a problem
> with some versions of the SPA3k where there is some sort of inbalance
on
> the PSTN port that causes echo right there rather than further down
the
> line?
> 
> Thanks
> 
> James
> 
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