[GreenKeys] Patch Panel details

[Don Robert House]

>  Greenkeyers,
>
>I'm now off of "nomail", for a while at least.
>
>I am planning to make a patch panel for my TTY station, and have a 
>couple jack bars for the purpose:
>
>1) Two rows of 1/4 inch PL-055 type jacks that have a normally closed circuit.
>
>2) Two rows of 1/4 inch T-R-S type jacks that have normally closed 
>circuits for both contacts.
>
>I assume that the tip-only plus shell ones were used for normal loop 
>circuits since by M-15 has such plugs on it that look original.
>
>What was the use of the TRS-type jacks, audio/telephone circuits?
>
>Or do I have it backwards.
>
>Roy
>- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!

Hi Roy,

You have it correct.  The Tip Sleeve jacks and plugs are normally 
used for telegraph switchboards; while the Tip, Ring, Sleeve jacks 
are normally used for voice frequency panels.  There are a few 
exceptions to this in test equipment where the designer did not want 
the send and receive circuits and associated cords to get reversed.

Don
-- 
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Don R. House
4716 Patty Lane, Ringwood, IL 60072
Tel: 815-653-0683
FAX: 815-653-0684
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