[Asterisk-Dev] Hardware details for the Digium TDM400P

[Peter Brown]

I have a DSP based system that is working on a four port FXS system
using a 200MHz arm processor.

Peter

On Sun, 2004-09-19 at 15:00, Michael Bielicki wrote:
> Hi Mr. DSP,
> does tht mean you would expect 2 tdm40b to work on a 500MHz system ?
> 
> 
> On Sun, 19 Sep 2004 12:25:19 +0800, Steve Underwood <steveu at coppice.org> wrote:
> > For any PC made in the last few years, processing four lines of
> > telephony on the host will barely load that host. Remember that if you
> > buy a card like the Dialogic ones, you get very little processing power
> > on the card. If can only do simple things like DTMF detection and
> > elementary ADPCM compression/decompression. Any serious computing -
> > like, say, a G,729 codec - still needs to be performed by the host.
> > 
> > When you look at larger scale work - T1/E1 scale and up - there are
> > valid arguments for and against putting serious processing power on the
> > card. For a four line card there has been no real technical argument in
> > favour of on board processing for several years. There are some valid
> > arguments related to product approvals in some countries, but those
> > issues are also much less of a problem than they used to be.
> > 
> > Regards,
> > Steve
> > 
> > 
> > 
> > 
> > list at asd-group.com wrote:
> > 
> > >Thanks for the feedback - it sounds like the TDM400P is generally a well
> > >thought of card with a couple of minor problems (probably in the drivers)
> > >that aren't show stopping given the occasional power cycle.
> > >
> > >I think I'll use it, but I am a bit concerned about the level of PC
> > >horsepower needed.
> > >
> > >It has to go in a Via EPIA system with their C3 (Nehemiah core) processor at
> > >1.2ghz (with full speed FPU). That's supposed to be equivalent to a
> > >similarly clocked P3 or Celeron.
> > >
> > >Will than be enough grunt for the TDM400P to power a SOHO system with one
> > >telco line and three internal extensions (ie one FXO and three FXS modules)?
> > >
> > >I wish that Digium would make just a one or two page "how it works" doc
> > >about the card and card-driver interaction. What registers does it have, and
> > >what do they do? When are interrupts generated, what for, and how frequently
> > >per call? Does it use DMA, and how? What does it do well? What does it do
> > >poorly? What could be improved on in the driver? How does the driver do
> > >things? You know, just basic stuff.
> > >
> > >It's not nice having to guess from driver code, which is hard to understand
> > >(esp the DSP code), possibly bug ridden (no offence) and not guaranteed to
> > >fully utilise the card's hardware facilities. A little bit of info would
> > >make understanding the lower levels of the software much easier.
> > >
> > >
> > 
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> 
>