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

[Nick England]

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
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