[asterisk-users] Re: Question about DSP in Digium card

[Salvatore Giudice]

You've got a decent server. Generally the limiting factor for the number of
simultaneous calls is more about server memory. That server could likely
handle 124 simultaneous calls, but you would be prudent to double that
memory size. Make sure you are running at 100 full especially if you are
using G.711. 10 Full uplinks won't cut it if you are running that kind of
bandwidth.

 

As for the DSP, you are right to be concerned about the Digium cards, but
not because of the DSP. The DSP is not where you will run into problems.
Digium cards feature 2 year old circuitry and do not play well with other
devices. You have to take care not to share interrupts with any components
that may be active on that system. Sharing an IRQ between a Digum card and
an Ethernet card would certainly spell disaster in my experience.

 

>From personal experience, I no longer use Digium hardware since I could
rarely push a quad port card to more than 13 channels per T1 circuit without
the card failing miserably. HDLC aborts abound.

 

For now, I only use Sangoma cards. These don't have the IRQ issues and I
have had no problems pushing their cards to their maximum. I recommend echo
canceller enabled cards for any T1/E1's you may use that are not long
distance carrier lines. 

 

Good luck, hope this helps with your capacity planning. - SG

 

 

 

 

 

 

 

 

##############################################

2007/3/24, A. Levy <ardielle at gmail.com>: 

Hello.

 

I have a TE405P Digium Card (4 E1's) with ISDN protocol and I need to find
out if there is any limitation about DSP capabilities, I mean, I am not sure
how many phone calls my Digium card supports, simultaneously. The calling
flow goes from IAX <-> ISDN. 
 

I am running this card into CPU like this:

- Micro PIV 3.0 

- 1Gbyte Memory

 

 

Thanks.

 

Levy.-
 

 

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