dialogic was RE: [Asterisk-Users] "Glare" condition - How well does asteriskhandle?

[Paul Crick]

> Lets see. Early 90s would be ISA cards in an industrial
> PC chassis full of ISA slots. Heavy IVR means talking
> most of the time. 3k bytes/s per voice for the commonest
> 24K ADPCM mode most people use with Dialogic. So, 12 E1s
> is 360 channels. 3kbytes x 360 = more than the ISA bus can
> handle, before I even add up the disk loading. Does not compute.
Not sure on the math there, but the company I worked at previous had 10 x
D/SC480-2T1s and a D/SC240-T1 in a single ISA chassis.. 21 PRIs = 483
channels. Chuck in a 4 port analogue card for system admin, and you're
pretty much as big as you can go, limited now by SC-Bus timeslots (we were a
handful under the max I think). Worked well with dual pentium IIIs, with
relatively heavy call load.

There's a bunch of these still in production, and they've since moved to PCI
cards, cramming 28 T1s in to a single chassis.. ok, not the best design -
I'd have preferred lots of smaller interlinked systems, but not my
decision..

> On the other hand, how come you can only do 2 E1s of IVR with *?
This is the thing I keep wondering about.. is it due to there being little
processing power on the Digium cards, them relying more on the host CPU to
do stuff?

Having read the list and the stuff Scott Stingel's posted, I'm inclined to
believe that a single 4 port T1/E1 card is the best way to go in a large
scale installation, even with 2 cards in the same box I'm pushing it/risking
it? Granted, he's doing high call volume with low duration (televoting and
stuff right?) so maybe the overhead is on the call setup and tear down? If I
had call hold times running in to minutes and tens of minutes, could I stick
8 T1s in a box and not have problems?