[GreenKeys] SB-2244 TTY patch panel

[Bill Horne]

I think it's just a throttling mechanism to slow the machines down while 
the rotors align in the crypto gear.

Bill, W1AC

On 1/3/2010 11:52 AM, Brooke Clarke wrote:
> Hi:
>
> It may be related to TEMPEST.  A mechanical TTY machine generates RF
> signals at each on or off transition.  If a bunch of machines are
> synchronized so they all have a transition at the same time then their
> TEMPEST emanations may get mixed up.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
> Jim Haynes wrote:
>    
>> Some implementations of Teletype with crypto equipment required that the
>> stepping the Teletype keyboard or tape reader at a fixed rate.  In the
>> Model 28 parts books you'll see mod kits to adapt things for "synchronous
>> pulsed operation".  A large station might have a TD stepper facility
>> consisting of a baud rate generator and then a bunch of boxes that
>> send out TD stepping pulses to all the TDs.
>>
>> I don't know why it was this way.  I don't have any first-hand knowledge
>> of crypto equipment, but I did once buy some TD stepping equipment at
>> a surplus sale.
>>
>> Where this is done each TD or keyboard has to have its usual loop and
>> then a loop for the stepping pulses.  So I'm guessing what you have
>> provides for switching both the signal and the stepping pulses.
>>
>>
>>
>> jhhaynes at earthlink dot net
>>
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-- 
E. William Horne
William Warren Consulting
Computer&  Network Installations, Security, and Service
http://william-warren.com
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