NSA
DATA TRANSMISSION
I (3) -F. L.UNCLASSIFIEDData Transmission Over Telephone Circuits------Bv-._________..UnclassifiedMany of the higher-speed cryptographic machines develciped at NSA OH'required lo operale over teLephnne channels. Because tM tel$p~ plan!WU8 not det;igned for digital devices, data transmission equipments areoflffl use.d as intermediaries between lMse machines and tkt transmissionmedium...
Declassified
Internal Periodicals & Publications
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Internal Periodicals & Publications
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330.4 KB