[Asterisk-Users] Digium should develop and sell just Dummy card. For timing...

[Chris Albertson]

Was I "that particular poster"?  Maybe.  But yes!  there is
absolutly no need for specialized hardware to meter an 8Ksps
stream out of a PC.   

Your example of a MP3 player depending on the hardware is valid but
what about a video player?  What does it use to keep a constant
30FPS rate?

Now here is the big one:  What about EVERY other voip application
that runs on PCs?  _They_ don't need special digium hardware.
There are hundreds of examples of software-only systems that
play back archived audio files over the network.

This point is so clear cut that yes any software design that depends
on a special PCI card to time audio is very poorly designed, so much
so I'd call it broken.

I've yet to read to entire SIP RFC but the media packets are sent UDP
and reassebled at the endpoint.  It think it is the end point's job
to meter these out to local audio device at the correct rate  is
is not?  I think the UDP packets only need to be send out at the
correct average rate and the exact timing is not even that critical.
I couldbe wrong nothaving read the whole RFC yet.  Millisecond level
timing is simply not even required  (You can prove me wrong
on this by pointing to the relivent RFC section.)




> I agree -- I think what that particular poster's point was was that
> there 
> are already sufficiently jitter-free timing sources in the PC and
> that it 
> seemed assinine to add another for a paltry 1KHz (IIRC).  He has a
> point, 
> but (again, speculation) Asterisk boxes may or may not have RTCs or
> even 
> USB ports, and using a processor-specific timer is even worse for 
> portability.  By locking on to an add-on card that can be added to
> any 
> system with a PCI bus, Asterisk gains portability.
> 
> And again, where is the official Digium response?  This is all
> speculation.  
> I was just putting out a request to end this stupidity and have an
> official 
> response so everyone can point to it and say "that's why."
> 
> I didn't think it'd end up in this mini flame war.
> 
> Regards,
> Andrew
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users


=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278 at yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson at aero.org
  KG6OMK

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