[asterisk-biz] ATA Bank for Asterisk, 400 phones

[Ruth Bridger]

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: asterisk-biz-bounces at lists.digium.com
[mailto:asterisk-biz-bounces at lists.digium.com] 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" <damin at nacs.net> 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.
>
>
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