On Thu, Sep 30, 1999 at 12:29:35AM +0200, Robert Schelander wrote:
> Just care about the
> upper layers and then you could attach anything you want - beginning with a
> TCM3105 used for 1200Baud FSK Bel202 up to some more compilcated circuits
> with PSK/QAM and scambling mechanisms.
My interest in this is for my own benefit primarily, and for a few software
simulation projects I have waiting in the wings. Modems simply cannot help
me with software simulation. Besides, it costs me nothing to write this in
software. It costs me money for modem chips (no matter how little).
I'm already working with the upper layer networking protocols for my
project, and am nearing completion. Now, I need to specify lower layers
(two separate standards documents).
> chips. I've done software and hardware on my own and it worked perfektly.
> The hardware consisted of a i80196 microcontroller, i8273 hdlc controller,
> TCM3105, GAL16V8 for address decoding, SRAM, an alphanumeric
> display and a keypad.
This is way, way, way too expensive/complicated for what I need (the bulk of
the expense comes from the PAL/GAL chip and the SRAM).
> I've also done some dumps with an logic analyzer and a multi-protocol
> data analayzer of different packet types.
Also resources I do not have.
> I don't know what you are going to do, but if I can help you with a specific
> problem, let me know.
ATM Networking over an amateur radio link. The Layer 2 specification is
called ARNI, and it's still a work in progress. Layer 1 specs will be
available for 1200bps definately, but I'm going to try and bump that up a
little bit (hence the software simulation, and hence my need for 1200bps
AFSK references -- I need something to benchmark the simulations with!).
I'll try to look for that ax25.txt file. It should be floating out there
somewhere. Thanks for the lead -- it's greatly appreciated!!
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