Is there any advantage of getting a T1 card with a channel bank over 2-3 FXO cards ? Thanks. Dovid -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20061031/0f74ec67/attachment.htm
YES! Many machines do NOT work well with multiple analog cards. Especially the Digium ones. Channel banks with FXO circuits are harder to come by on the used market, though Many all FXS channel banks can be had used, though. If you want multiple FXO's and do not want to go the T1 route, look towards the Sangoma A200 John Novack Dovid B wrote:> Is there any advantage of getting a T1 card with a channel bank over > 2-3 FXO cards ? > Thanks. > > Dovid > ------------------------------------------------------------------------ > > _______________________________________________ > --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 >
Eric "ManxPower" Wieling
2006-Oct-31 12:36 UTC
[asterisk-users] FXO Cards vs. Channel bank with T1
Dovid B wrote:> Is there any advantage of getting a T1 card with a channel bank over 2-3 FXO cards ? > Thanks.In my experience a T-1 port w/channel bank just works better. The more cards you use, the more interrupts are generated. My standard configuration for analog FXS ports is a T-1 card (Digium or Sangoma) and an Adtran TA750 Channel Bank. The Adtrans can be found very cheap on eBay. FXO ports tend to be much expensive, but you can find them on eBay as well. Why not just get a PRI or channelized voice T-1?
On Tue, Oct 31, 2006 at 08:20:57PM +0200, Dovid B wrote:> Is there any advantage of getting a T1 card with a channel bank > over 2-3 FXO cards ?If you need enough ports to make a T-1 card cost-efficient, then you might oughtta be looking at an Ethernet to FXO media gateway instead -- assuming you need analog interfaces. FXO side, why not just go T-1 or PRI? Cheers, -- jra -- Jay R. Ashworth jra@baylink.com Designer Baylink RFC 2100 Ashworth & Associates The Things I Think '87 e24 St Petersburg FL USA http://baylink.pitas.com +1 727 647 1274 "That's women for you; you divorce them, and 10 years later, they stop having sex with you." -- Jennifer Crusie; _Fast_Women_
Dovid B wrote:> Is there any advantage of getting a T1 card with a channel bank over > 2-3 FXO cards ? > Thanks.channel bank is more friendly to faxes and modems (v90 can work too)
This is incorrect. The data is still packetized and passed through IP which provides the same echo cancellation and distortion issues as a call that passed through an FXO/FXS card. Ejay Hire -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Ed Sent: Wednesday, November 01, 2006 3:42 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] FXO Cards vs. Channel bank with T1 Dovid B wrote:> Is there any advantage of getting a T1 card with a channel bank over > 2-3 FXO cards ? > Thanks.channel bank is more friendly to faxes and modems (v90 can work too) _______________________________________________ --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
On Wed, Nov 01, 2006 at 09:08:43AM -0600, Ejay Hire wrote:> This is incorrect. The data is still packetized and passed through IP which > provides the same echo cancellation and distortion issues as a call that > passed through an FXO/FXS card.The issue here is an "implementation bug" of Zaptel rather than a fundemental archtectual flaw. For fax or modem to work well you need a good line. One of the problems that may cause line quality problems is different clock speeds of different components of the system. They may cause an occasional "click" every number of seconds. The problem I referred to is that different Zaptel cards may have a different clock. Asterisk uses the clock of the "master" zaptel device, but it is not exactly clear who that master device is (basically: the first Zaptel device). No other device tries to get clocking from it. If you use an external channel bank you work around the problem by connecting all the external connections (both PRI lines and channel bank FXO/FXS lines) through the same PRI card. That card will not have a problem being in sync with itself. As for our device: our short-term solution is to sync the PC clock from Zaptel as we can already sync our device from the PC. But the long term solution is to sync our device (and other zaptel devices) from the master zaptel device. -- Tzafrir Cohen icq#16849755 jabber:tzafrir@jabber.org +972-50-7952406 mailto:tzafrir.cohen@xorcom.com http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir
Ejay Hire wrote:>This is incorrect. The data is still packetized and passed through IP >are you sure? ;) we can connect two zaptel channels directly (example - call from channel bank to pstn. both connections to channel bank and pstn are e1).