>
> > +---------------------------------------------------------------------+
> > | PM-3 Chassis |
> > | |
> > | +-------+ |
> > |+---------+ +--------+ | High | +-----------------+ |
> > || Digital | | Digital|---| Speed |---| Routing | |
> > - PRI --| Switch |--digital--| Modem |---| Back |---| Engine | |
> > |+---------+ +--------+ | Plane | +-----------------+ |
> > | +-------+ |
> > | |
> > +---------------------------------------------------------------------+
> >
> >
> > Digital data in, through digital modem, onto digital backplane, through
> > routing engine to ethernet.
>
> Yes, but in the case of a v.34 modem connecting to the digital modem you
> have a datastream on the B channel which is a digital PCM representation
> of and analog (v.34) signal of a digital data stream (RS-232). So you
> can convert Digital PCM data directly into serial data and jump over the
> analog v.34 signal? Or, do you covert the PCM data stream back into
> analog (v.34) and run that through a modem to get the RS-232/PPP ?
>
> I see how it works pure digital for ISDN because it is pure digital. I
> can't see how you can bypass the PCM -> analog codec conversion, unless
> you do it all in software on the DSP.
It is all done in software in the DSP.
JGT
-- John G. Thompson Livingston Enterprises Inc. Phone: (800) 458-9966 JOAT(MON) 6920-220 Koll Centre Pkwy. Fax: (510) 426-8951 support@livingston.com Pleasanton, CA 94566 http://www.livingston.com