[GreenKeys] Little Army Patch panel: Cable color codes?

[kf9nz at juno.com]

            That is generally the arrangement the AAR T&T * standard
telegraph switchboard used, except that they usually had two "set" jacks,
and one of the loop jacks was usually labelled "monitor", where we would
patch a milliammeter or test set.

*(That's  Association of American Railroads, Telephone and Telegraph)


On Mon, 02 May 2005 17:44:18 -0400 Roy Morgan <roy.morgan at nist.gov>
writes:
> At 11:22 AM 4/29/2005, Roy Morgan wrote:
> >In ... "TM11-655 Fundamentals of Telegraphy (Teletypewriter)", I 
> >discovered very brief descriptions of two Army items I have: ....
> >2) A little wooden box with 5 rows of 6 jacks intended for 
> temporary 
> >patching of various parts of a teletype system.
> 
> Greenkeyers,
> 
> This thing turns out to be:
>   - AT&T Telephone Test Board 392-2301
> or:
>   - 63C1 Telephone Loop Switchboard
> 
> Depending on if you are in the army or not, I guess.
> 
> My memory was a bit optimistic: it has four rows of four each jacks. 
>  By 
> peering intently with a magnifying glass at the label inside, I have 
> 
> figured out how it works:
> 
> The two rows marked LPG 1 and LPG 2 are looping jacks (type 303A).  
> They 
> allow another device to be inserted into a loop without breaking the 
> loop. 
> So, a teletype conversation in progress would not be interrupted if 
> you 
> patch another device into the loop.
> 
> The third row marked SET  (jack type 438C) allows you to remove the 
> 
> existing teletype set from it's loop or circuit, again without 
> interrupting 
> the loop it was in, and connect it via the patch cord into any of 
> the other 
> (three) circuits.
> 
> The fourth row, marked MISC. is just four jacks available of the 
> sort in 
> the Looping rows.  They could be used to carry any other four 
> circuits.
> 
> Thinking about how this thing can be used leads me to believe the 
> arrangement of jacks is quite versatile.  You could:
> 
>   - Have four circuits set up doing different things, with four 
> different 
> "Sets".
>   - Remove any of the sets from it's normal loop and insert it into 
> any of 
> the other three.
>   - Put a nice panel mounted center scale Western Electric current 
> meter 
> (like I got an estate sale recently) on one of the MISC jacks and 
> use it to 
> monitor line current in any of the four circuits.
>   - Put a T/D on one of the MISC jacks, to be able to send a brag 
> tape at 
> any time.
>   - Put a receive only page printer on another jacks for use when 
> your main 
> SET runs out of paper
> 
> And all this in a thing the size of half a loaf of bread.
> 
> >   The connections are made with a set of solder terminals ...
> >What is the standard color code for multiple-pair  
> telephone/teletype cables?
> 
> I got the color codes from more than one helpful list member, and 
> discovered that indeed the code was used to wire this thing up 
> originally.
> 
> I look forward to getting this thing hooked up.
> 
> Roy
> 
> 
> 
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Cell 301-928-7794
> Work: Voice: 301-975-3254,  Fax: 301-948-6213
> roy.morgan at nist.gov --
> 
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