[Milsurplus] red/black TTY shipboard question

[C.Whitaker]

de WB2CPN
Red is encrypted.
Black is not.
In USAF they were physically separate.
Red had effective filters on power and
signal lines.
Same Red/Black terminology used on
nukes, and their vehicles.
Red used Badge-Swap.  Black didn't.
73  Ol' AACS/AFCS man.
Clete
+++++++++++++++++++++++


On 5/7/2012 3:33 PM, Nick England wrote:
> Howdy gang - I'd like to understand how a couple of items were
> actually used aboard Navy ships -
>
> One is a key-operated CLASSIFIED/UNCLASSIFIED teletype line switch SA-734/SG
> http://www.navy-radio.com/rtty/misc/sa734-sg-91.jpg
> I presume CLASSIFIED means red (unencypted) circuits and UNCLASSIFIED
> means black (encrypted)?
> So an UNCLASSIFIED switchboard would be an SB-1203
> http://www.navy-radio.com/rtty/patch/sb1203-02.jpg
> and a CLASSIFIED one would be an SB-1210
> http://www.navy-radio.com/rtty/patch/sb1210-02.jpg
>
> OK - the actual teletype equipment connects to this switch via two
> 1/4" phone jacks, only one of which is uncovered at a time by turning
> the key. What TTY equipment would be plugged in here - a 28KSR on a
> roll-around stand? or test gear? or something permanently mounted but
> with a flexible line cord? In other words if I saw one of these
> switches shipboard, just what would be plugged into it?
>
> And the related device is the UNCLASS/CLASS warning lamp ID-866/SG
> http://www.navy-radio.com/rtty/misc/id866-sg-01.JPG
> I assume this was controlled by the switch and installed near the
> teletype equipment.
>
> So the red WARNING lamp lets you know that this is a circuit for
> UNCLASSIFIED info only and you'd better not type anything on that KSR
> unless you want Boris and Natasha to read it.
>
> I convinced myself all this made sense until I looked at this
> installation aboard USS New Jersey, which seems exactly opposite....
> http://www.navy-radio.com/ships/bb62/p1010024.jpg
>
> So how did things actually work??? I've got these items installed with
> my TTY gear - now I just need to find a KW-37 crypto unit at Dayton or
> Fair Radio next week - ha!
>
> thanks,
> Nick K4NYW
> www.navy-radio.com
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