[Asterisk-Dev] Hardware details for the Digium TDM400P

[Michael Bielicki]

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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-- 
Michael Bielicki