Allow me to clarify that statement. The traffic on the PCI bus to the CPU is the bottleneck. We have sent emails to Digium regarding multiple quad-span cards in a single PC-class machine and they recommended against it for this reason.

From the Digium emails:
- I'd use two machines, with two quad cards each. And then, I'd need to be using only the G.711 ulaw protocol. Then, I'd still use a mid-range dual Xeon CPU machine in the 2.4GHz+ spectrum.


We do not want to be limited to the G.711 ulaw codec and we would need at least four quad-span cards for a single machine setup. Any single machine setup also has inherent scalability issues.

Matthew Roth
http://www.voip-info.org/tiki-index.php?page=Running%20Asterisk%20on%20Debian

Brian West wrote:

Originally, we planned to implement this design by purchasing one
multi-processor machine and putting multiple quad-span T1 cards
(Wildcard TE4xxPs) into it.  Through research, it was determined that
the PCI bus couldn't handle the digital signal processing (DSP) from
more than one quad-span card.


The PCI bus doesn't do any processing.. The CPU would be... you can get two or more quad cards in a box if you don't do any transcoding.



/b

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