[GreenKeys] NSA article - "Development of Automatic Telegraph Switching Systems"

[Duncan Brown]

Thanks, Nick!

Other interesting articles from the NSA Technical Journals listed at
https://www.nsa.gov/news-features/declassified-documents/tech-journals/

Have fun,

Duncan
K2OEQ

On 17-Feb-17 14:44, Nick England wrote:
> FYI -
> Development of Automatic Telegraph Switching Systems
> BY R. D. PARKER
> Unclassified
> Abstract
> There are two general types of automatic telegraph switching systems.
> In one, electrical circuits are established to provide! communication 
> paths
> between telegraph stations.s in customers' offices and are broken when 
> the need for communication is over. In the other, direct electrical 
> circuits
> between stations are not established, but coded information in messages
> automatically routes them through telegraph networks to their 
> destinations.
> This paper describes briefly some of the systems now in use, and outlines
> some of the requirements which had to met to provide a satisfactory 
> service
>
> https://www.nsa.gov/news-features/declassified-documents/tech-journals/assets/files/development-automatic.pdf
>
>
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>
>
>
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