ASR33 touchtone keypad questions

From: Ethan Dicks <erd_at_infinet.com>
Date: Mon Oct 26 00:15:34 1998

Someone a while back offered to help with questions I had regarding
reinstalling a touchtone keypad I foolishly removed from an ASR33
while trying to convert it from 110 baud dataset use to current loop.

I just located the keypad this weekend. I have two here, same era,
different connections. ISTR that the one with more leads came out
of the ASR33. Here goes...

Number one:

Top marking - 35Y3D 4-77

Under the "3" button - red w/green stripes
Under the "2" button - red, black, orange w/black and white w/blue (4 wires)
Under the "1" button - green and blue (two wires)
Under the "6" button - white

for a total of 8 wires


Number two:

Top marking 35AF3A

Under the "3" - black jumper, purple, red w/ green (2 external)
Under the "2" - green w/white, red, white (3)
Under the "1" - black, orange w/black, white w/blue (3)
Under the "5" - orange
Under the "4" - green
Under the "*" - blue
Under the "#" - the other end of the black wire from under the "3"

For a total of 11 wires.

I would appreciate any information or leads to information about Western
Electric touchtone pads.

The plan with the ASR33 is to set it up on a phone line simulator with a
110 baud modem on the computer side, driving the teletype through its
original interface. Much less work that grubbing around inside the TTY
to install a current loop. I already have the simulator. We used to
make them at a place I used to work at. I have the last run of bare
PCBs and enclosures, etc. They were 8048-based, and simulated failures
as well as successful calls. I used one once to add V.22 synchronous
autodial support to our HASP and 3780 products for the VAX (thus keeping
it within the 10-year rule).

Thanks,

-ethan
Received on Mon Oct 26 1998 - 00:15:34 GMT