Telegraphy – Systems – Printing
Patent
1976-02-19
1982-04-06
Birmiel, Howard A.
Telegraphy
Systems
Printing
178 2R, H04L 900
Patent
active
043237290
ABSTRACT:
A crypto control circuit arrangement is disclosed for controlling crypto operation in the case of procedure-controlled semi-duplex data transmission systems in which data are transmitted from a first station with a first data device and a first crypto device, via a transmission path, to a second station having a second crypto device and a second data device. The changes of the data transmission direction are signaled with an order word which is transmitted from the first crypto device to the second crypto device and is evaluated with the help of an order evaluator. A control signal is emitted at the output of the second data device which prepares the second crypto device for the transmission when an end signal is transmitted from the first data device to the second data device. The output of the order evaluator and the output of the second data device are connected with inputs of a gate and a stop signal is only emitted toward a decoding device of the second crypto device by way of the gate when, on one hand, a received order is recognized with the help of the order evaluator and, on the other hand, the control signal indicates the end of the data transmission from the first station to the second station.
REFERENCES:
patent: 3395245 (1968-07-01), Harris
Birmiel Howard A.
Siemens Aktiengesellschaft
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