Five V insertion unit

Details Five V insertion unit Five V insertion unit

1959-07-16

1981-04-14

Birmiel, Howard A.

Pulse or digital communications

Repeaters

Testing

H04L 900

Patent

active

042623596

ABSTRACT:
2. For use with a cryptographic teletype transmission system having a relay for transferring teletype characters to an encyphering transmitter, a decyphering receiver and a teletype printer, a security system comprising a generator for producing an auxiliary teletype character, circuit means responsive to the failure of transfer of a valid teletype character to said transmitter to activate said generator to supply an auxiliary character to said transmitter, a clamp circuit responsive to activation of said generator to inhibit transfer of a valid character to said transmitter until said auxiliary character has been completed, a transfer system for transferring the decyphered characters from the receiver to the printer, storage means for storing a plurality of successive teletype characters, a recognition circuit responsive to the presence of said auxiliary teletype character in said storage means for inhibiting printing of said auxiliary teletype character.

REFERENCES:
patent: 2897268 (1959-07-01), Bacon
patent: 3042751 (1962-07-01), Graham

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