Clear channel interface module and method therefor
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United States of America Patent
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Nov 26, 1996
Grant Date -
N/A
app pub date -
Sep 6, 1994
filing date -
Sep 6, 1994
priority date (Note) -
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Abstract
A communication system (10) includes a channel (18) that conveys both clear and secure communications and a channel (12) that does not convey clear communications. An interface module (24) resides between these two channels. When a call is attempted through the two channels (12, 18), the module (24) plays a plain-text, audio voice message (54) into the clear side of the call. The message (54) instructs a human operator to take appropriate actions to cause an initiate security setup (ISS) signal (56) to be generated by a secure terminal (28). This message (54) is continuously repeated until the ISS signal (56) is detected at the module (24). The ISS signal (56) includes predetermined frequency components which are notched out of the message (54) so that the ISS signal (56) may be reliably detected at the module (24).
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