In cleaning out the office I came upon these units, three pieces of
Coherent Communications Corp FSM-86B LSI Subset, a device which allows
piggy-backing a data channel over a phone line, stealing a bit of
bandwidth at about 2800 Hz. You can key in using +/- 3V to +/- 25V
(so can run a telex over it), or signal via RS-232 or RS-422/423.
Maximum data speed is 600 bps.
I used these for a number of years to extend a telex circuit (remember
them!) over my phone line on a filled cable with no spare pairs in a
foreign country. There are two units to make a pair (one at each end)
and a spare.
Probably not many people have a telex any more, but these units can
work fine to extend any kind of low-speed data over a voice channel.
Offers? (If not, suggestions where I can flog to find someone in
need?)
Thanks for all advice.
Jeffrey Race
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