> How do you know this? It could be lying to you. Have you looked at
> the output with an oscillioscope?
Well, we found it lying around, and hooked it up to a USR Courier (14k4)
also lying around but with the manual. After a little while convincing the
PABX to let them talk to each other, we dialled the Courier from the unknown
thingy and got about 600 bps reported, which was odd. The Courier's manual
said it did 2400bps with QAM (not the bit/baud or anything like that
though), and the Courier could connect to a different 2400bps (branded
V.22bis) modem no problem (as well as a number of other USRs). We did hook
both modems up to a 'scope, and the carrier (well, the nice big oscillation
anyway) from the unknown thing was a considerably higher frequency than that
of the USR.
We later took the unknown device to the local Bloke Who Knows These Things
(stereotypical hacker guy - scruffy grey beard, glasses, braces, burns on
fingers :) ) who used to do datacomms for British Telecom, and he fiddled
around with it for a day or so and said it was unusual in that it didn't do
any QAM at all.
Regards,
Ben A L Jemmett.
(http://web.ukonline.co.uk/ben.jemmett/, http://www.deltasoft.com/)
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