[Asterisk-Users] Best FXO hardware for home use

[Kerry Garrison]

There is no doubt that given a particular scenario, anything won't work
properly. This is not necessarily a problem with the SPA3000 or the TDM
cards, this is much more of a phone line issue. Granted, those devices don't
handle line issues as well as some other devices (such as the long loop
issue you mentioned) but to write them off as being poor products I felt was
a bit overkill. I have several very successful installs with TDM cards and
SPA3000s and on the other hand I have an install that nothing seems to want
to work with the PSTN lines that are there. So while I do agree with you on
what the actual issue is, I don't think it is 100% fair to write off the
SPA3000 in all cases.

Kerry Garrison
Director of Technical Services
Tech Data Pros - Orange County's Mobile IT Service Provider
(949) 502-7819 x200 - kerryg at techdatapros.com
http://www.techdatapros.com



> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com 
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of 
> Rich Adamson
> Sent: Wednesday, January 25, 2006 4:00 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] Best FXO hardware for home use
> 
> 
> > > echo cancellation is pretty limited on these cheap devices. 
> > > the spa3000 manual for example states the AEC is limited to 8ms. 
> > > good AECs will handle 64ms or more. in my experience the spa3000 
> > > echo canceller is cranky. it works most but not all of the time.
> > 
> > I have been using one for 6 months without any problems. 
> Make sure you 
> > have the most current firmware on it and it should work just fine.
> 
> Kerry,
> 
> There "is" an issue with the spa3k (as well as the TDM04b) in 
> terms of handling echo properly on long pstn loops. You are 
> obviously on a relatively short loop if you've not been 
> exposed to the variable echo cancellation issues.
> 
> In other words, long pstn loops basically fall outside the 
> limits of the echo cancellation software as someone else 
> already noted.
> 
> 
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