I would like to add some information about the capacity of the USB 2.0 connection. The USB 2.0 interface provides a theoretical speed of 480,000,000 bits per second. A typical uncompressed phone conversation uses about 64,000 bits per second per direction, plus some overhead; in total less than 200,000 bits per second per phone call is used. Thus, the theoretical concurrent number of conversations that the USB 2.0 interface can handle is 480,000,000 divided by 200,000: roughly 2,400 calls for a single USB 2.0 port. For more info, see http://www.xorcom.com/astribank-technology/usb2-interface.html
Bottom line...the USB connection is not the bottleneck. Finding a PC with the required number of PCI slots would be a problem with the suggested Sangoma solution. As for the channel banks, since the 1U Astribank supports 32 channels (as opposed to the typical 2U 24 channels supported by other types), the Astribank is obviously the better choice. For a point-by-point comparison, see http://www.xorcom.com/astribank-technology/astribank-vs-channel-banks.html I'd be happy to answer any other questions about this technology... Ruth Bridger Xorcom - Asterisk Based Hardware Solutions -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mitul Limbani Sent: Wednesday, January 07, 2009 08:36 To: Commercial and Business-Oriented Asterisk Discussion Cc: Commercial and Business-Oriented Asterisk Discussion Subject: Re: [asterisk-biz] ATA Bank for Asterisk, 400 phones Greg, Pair of sangoma and we are talking of really powerful machine, I would rather put two low cost server hardware or buy 2 x XR30xx series hardware each connected with 8 astribank and can handle upto 800+ phones. USB is still powerful then PRI moreover its easy you dont have to open up hardware thatmeans you are safe on warranty front. Regards, Mitul Limbani, Founder & CEO, Enterux Solutions Pvt Ltd, The Enterprise Linux Company(r), http://www.enterux.com/ On 07-Jan-09, at 8:43, "Gregory Boehnlein" <[email protected]> wrote: >> I think you should have a look at xorcom astribank you can have 32 >> ports in one bank and all you need is USB on you asterisk server. All >> the drivers are inside the official zaptel/dhadi drivers so >> installation is pretty much out of the box. > > He mentioned that he needed to have 400 phones. That makes for a lot > of Astribanks, and I dare say probably more bandwidth than can > reasonably be expected to push through a USB bus. > > While the idea is good, if I were building the solution, I would be > looking at a pair of the Sangoma 8 port T1 cards w/ external channel > banks. > > > _______________________________________________ > --Bandwidth and Colocation Provided by http://www.api-digital.com-- > > asterisk-biz mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-biz > _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.176 / Virus Database: 270.10.3/1879 - Release Date: 06-Jan-09 17:16 _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
