Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate
2005-12-27
2005-12-27
Bui, Bing Q. (Department: 2642)
Telephonic communications
Multi-line or key substation system with selective switching...
C379S171000, C379S383000
Reexamination Certificate
active
06980634
ABSTRACT:
A controller selectively connecting and disconnecting extensions from a telephone line includes a plurality of extension connector ports selectively connected to a communication device and a plurality of relay switches. Each relay switch has three terminals and a toggle movable between connecting the first and second terminals and connecting the first and third terminals. Each first terminal is connected to a respective extension connector port. A processor is connected to an outside telephone line. Entry of a predetermined command code prevents use of the communication device connected to selective toggles. A plurality of tone detector modules each generate a command signal controlling the processor to connect a respective extension to the outside telephone line. A plurality of tone location identifiers are each activated upon receipt of a control signal from the respective tone detector module for generating a unique signal by which the processor distinguishes the extension connector ports.
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Bui Bing Q.
Kroll Michael I.
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