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 - [EMAIL PROTECTED] > http://www.techdatapros.com > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] 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. > > > > > > _______________________________________________ > > --Bandwidth and Colocation provided by Easynews.com -- > > > > Asterisk-Users mailing list > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > ---------------End of Original Message----------------- _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
