25 May
2013
25 May
'13
6:37 p.m.
Hi all,
i have an old teleprinter with an rca logo on the front that is sitting on an
extel interface box.
the extel model is AN 11R 155
it was used with a upi or api wireline.
the interface has a crystal selector switch and i have no idea what that is for or why it
used xtal's on wireline.
the printer is dot matrix but not 9 pin.
What two wire interface and protocol did this use?
i'm thinking eather 20 ma current loop or some odd subcarrier audio line.
anyone know?
Bill