On Wednesday 08 August 2007 3:08:06 pm Henry L.Coleman wrote: > Hi all, I have a client who is getting a T1 from Bell. As I don't have any > experience in the quality of various vendors PCI cards and if echo > cancellation is really required I am looking for some real life experience > on these products. I have heard good things about Sangoma so I will > probably go with them, but the echo card is twice the price of the > standard T1 card and as the client is not flush with money I would prefer > to use the least expensive option. I understand that the echo cancellation > is under software control but how much overhead does this really add to > the system ? If anyone out there is using the A101 card I would grateful > if they could let me know if there are any quality issues with this card.
I've run the gamut of echo cancellers, processors and T1 interface cards. You want hardware echo cancellation. The free ones won't pass g.168, the Oki echo can on the *early* Digium cards is shit, but the Octasic which is found in both Sangoma and Digium hardware Just Works<tm>. Digium does not have a single-span card with hardware echo can. I've used the Sangoma A101 and A104d cards with great success, and if you ever do run across something fishy, they're technical support is excellent. Whether you go with a card with on-board echo cancellation, or you ebay yourself a tellabs shelf, it doesn't much matter. Price and physical space are the tradeoffs in this game. Don't settle for the free echo cancellers available in Zaptel. While they work marginally well, your customer will not be happy with marginal audio quality in his brand new and expensive PSTN connection. There is the HPEC which is a software echo cancellation "driver" available from Digium, but I have not used it to be able to comment one way or the other. -A. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
