Portable field control unit for emergency telephone communicatio

Details Portable field control unit for emergency telephone communicatio Portable field control unit for emergency telephone communicatio

1980-06-24

1982-10-12

Popek, Joseph A.

179 91R, H04M 322

Patent

active

043540589

ABSTRACT:
A portable field unit for conducting and controlling emergency telephone communications, particularly in hostage situations, is disclosed. Three telephone lines and a monitoring line can be connected to the unit, which can function as a miniature manually operated central office. A prime operator can control a first line and a common line, while a backup operator can control a second line and the common line. The backup operator can monitor the prime operator's line, and the prime operator's line can also be remotely monitored. The first line and the common line can be patched together by the prime operator for direct communication between them. A privacy switch is provided under the prime operator's control to produce a masking tone in the monitoring circuits when a private communication between the first line and the common line is desired.

REFERENCES:
patent: 2468749 (1949-05-01), Groh
patent: 3704347 (1972-11-01), Brown

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