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RTEMS and ISDN
- Date: Mon, 8 Feb 1999 05:57:41 -0600
- From: muellaue at via.at (Wolfgang Müllauer)
- Subject: RTEMS and ISDN
I am currently planning to write an ISDN Stack for RTEMS, as
we try to use PCs with RTEMS 4.0 als a platform for IVR
(interactive voice response) systems.
I have the following idea:
We are currently using Dialogic Voice boards that cost more than
800USD per analog interface. These boards have one or more DSPs
and a general Purpose CPU for managing the interface, doing
DTMF decoding, playing soundes etc.
IMHO it should be possible to use a dumb $90 PCI-ISDN adapter for
speech processing if it is possible to configure a cyclic task
that is scheduled every 125 us (8000 Hz) for managing the basic voice
processing like conferencing, playing sounds etc.
As current Motherboards have up to 5 PCI slots, we could configure
an IVR with 10 ISDN Voice channels and maybe VoIP Support at a fraction
of the costs of general purpose IVR systems.
So my questions:
Has anybody experience with tasks that are scheduled every 125 us - does
that work under everyday conditions?
Can I realize such a system with a Pentium-II-450 PC?
Has anybody written an ISDN Protocol Stack for RTEMS?
Does anybody do any signal processing in RTEMS?
all hints are welcome!
Vienna / Austria (Europe)
(muellaue at via.at)