Structure for detecting plug/unplug status of phone-jacks by...

Details Structure for detecting plug/unplug status of phone-jacks by... Structure for detecting plug/unplug status of phone-jacks by...

2006-05-30

2006-05-30

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Conductor identification or location

Reexamination Certificate

active

07053598

ABSTRACT:
The scheme for detecting the plug-in status by using single bit generated by a network with serial resistors, comprising a plurality of jacks having a spring switch, wherein the number of the plurality of jacks can be selected depending on the demand and a plurality of resistors followed the spring switch and connected in serial. Output voltage-generating resistor is coupled to the plurality of resistors in parallel to obtain the output voltage, thereby determining the plug-in status. Wherein the plurality of jacks and the plurality of resistors construct a multi-jack network, a first terminal of the multi-jack network refers to a common node between a first connecting terminals of the spring switch of the plurality of jacks and a first resistor of the plurality of resistors, the first terminal being coupled to a first reference voltage, a second terminal of the multi-Jack network refers to a common node between the second connecting terminals of the last jack and the last resistor. Wherein the output voltage-generating resistor is coupled between the second terminal of the multi-jack network and a second reference voltage.

REFERENCES:
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patent: 6590374 (2003-07-01), Har-Lev
patent: 6750643 (2004-06-01), Hwang et al.
patent: 2003/0025516 (2003-02-01), Chao et al.

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