Telephonic communications – Substation or terminal circuitry – Amplifying
Patent
1994-12-12
1999-07-20
Hunter, Daniel S.
Telephonic communications
Substation or terminal circuitry
Amplifying
379214, H04M 100
Patent
active
059265434
ABSTRACT:
Existing automatic log on/log off systems in telephone systems determine whether or not a workstation is occupied and whether calls can be directed to that workstation by determining whether or not the amplifier that provides the interface between the telephone system and the occupant's headset is plugged into the workstation. Recent headsets have included a connector in the cord between the headset and the amplifier, enabling the occupant to leave the workstation without unplugging the amplifier. However, this defeats the sensing mechanism of the existing automatic log on/log off system. An amplifier according to the invention replaces the existing amplifier and includes a detector for determining whether a communication link exists between the headset and the amplifier, and an activator for activating the existing automatic log on/log off system in the telephone system. In the preferred embodiment, the detector senses both interruption and reestablishment of the communication link between the headset and the amplifier, and the activator activates both current-sensing and voltage/resistance-sensing automatic log on/log off systems.
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Chen Shu-Ren
Lynn Dwight D.
Reid Kirk A.
GN Netcom Inc.
Hunter Daniel S.
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