[asterisk-users] Re: 200+ analog phones connected to FXS modules

[Andrew Kohlsmith]

On Saturday 02 December 2006 14:26, Csibra Gergo wrote:
> Well, the data bandwidth is only one. The irq is the other, and that
> is the bottleneck.

Unless I am mistaken (first time for everything, <g>), the mutli-span cards 
issue 1 interrupt per every millisecond, and *all* spans on that card are 
serviced in that interrupt.

To put it another way:

TDM4xxP - 1-4 channels, 1000Hz interrupt rate
TE100P - 1-24 channels, 1000Hz interrupt rate
TE2xxP - 1-48 channels, 1000Hz interrupt rate
TE4xxP - 1-96 channels, 1000Hz interrupt rate

I know that multiple cards do not share the zaptel interrupt, so with two 
cards you have two 1000Hz interrupt sources.  I have a back-burner "I wonder 
if" kind of idea which involves zaptel shutting down the interrupt on the 2nd 
(and more) cards and servicing all cards in one interrupt, but the back 
burner's so far away now I don't know if I'll ever get to it.  :-)

-A.