[Asterisk-Users] Best FXO hardware for home use

[Rich Adamson]

I didn't right those products off and in fact use both on a regular
basis. For the price, both are pretty good. However, for a higher price
there are products on the market that _do_ handle echo cancellation in
a very solid fashion (eg, Mediatrix 1204 as one example) regardless of
the analog cable lengths, etc. 

To blatantly suggest the spa3k or TDM are the _recommended_ choices
totally ignores their weaknesses. In other words, chose the product that
fits the situation, and for this list there seems to be a large number
of people that don't have a clue how analog lines are even constructed
let alone measured. There is no such thing as one product that fits all 
needs.

------------------------

> 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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