[GreenKeys] Patch cables needed

[Nick England]

Each loop or circuit contains the following jacks:

LPG (looping jacks) normally closed circuit contact phone jacks. Any
teletypewriter patched to LPG jack with patch cords is connected in series
in that particular channel, two or more LPG jacks are provided in each
channel;
SET (set jacks) the jacks labeled SET incorporate a
double-throw-double-pole switch; by inserting a DUMMY PLUG into the SET
jack, the teletypewriter originally in this channel is disconnected;  by
inserting a patch cord into the SET jack, the teletypewriter originally
connected is removed from the circuit and can be patched to any other
circuit by inserting the patch cord into the LPG jack of the desired
circuit;
MISC (miscellaneous jack) these jacks are normally closed contact phone
jacks identical to the LPG jacks; the MISC jacks are not wired to any
particular circuit; teletypewriters not normally assigned to a converter or
other terminal equipment are internally connected to the MISC jacks and are
then available for patching to any circuit.

"NOTE: Anyone patching or unpatching circuits from a TTY panel must be sure
to pull the plug from the looping jack (LPG) before removing the other plug
from the SET (machine) jack. Pulling the SET jack first interrupts all TTY
message traffic on that channel. IT ALSO PRODUCES A DANGEROUS DC VOLTAGE ON
THE EXPOSED PLUG!"

Also see this page -

http://www.navy-radio.com/rtty/sb1203.htm

Nick England K4NYW
www.navy-radio.com

On Thu, Sep 10, 2015 at 1:44 PM, Paul Heller <paul0926 at comcast.net> wrote:
>
> Nice picutres, Roy and Keith. Interesting that both these gems have two
rows of SET and two rows of LPG (and then Keith’s has one more row MISC.
>
> What do SET and LPG mean?
>
>
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