Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2002-04-17
2003-11-04
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C307S126000, C333S101000
Reexamination Certificate
active
06643595
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to telecommunications systems, and more particularly, to systems and techniques for detecting a device that requires power.
BACKGROUND OF THE INVENTION
Data terminal equipment (DTE) devices are well known. Examples of DTE devices include any kind of computer, such as notebooks, servers, and laptops; smart VCRs, refrigerators, or any household equipment that could become a smart device; IP telephones, fax machines, modems, televisions, stereos, hand-held devices, or any other conventional equipment requiring power. Heretofore, DTE devices have generally required external power from an AC power source. This methodology suffers from a number of drawbacks including interoperability during power shortages or failure of the external power source. Accordingly, it would be desirable to implement a system where the DTE power is drawn directly from the transmission line. This approach, however, would require a technique for detecting whether a DTE is connected to the transmission line and whether the DTE requires power.
SUMMARY OF THE INVENTION
In one aspect of the present invention, a power detection system includes a detector having an output and a return, and a device to selectively couple the detector output to the detector return when the device requires power.
In another aspect of the present invention, a detector having an output and a return includes a word generator coupled to the detector output, and a comparator to compare the detector output with the detector return.
In yet another aspect of the present invention, a method for detecting a device requiring power includes transmitting a pulse to the device, receiving the pulse from the device, and detecting whether the device requires power in response to the received pulse.
In yet still another aspect of the present invention, a transmission system includes a transmission line interface having at least one port, a two-way transmission line coupled to one of the ports, and a device coupled to the differential transmission line, the device selectively coupling the two-way transmission line together when the device requires power.
REFERENCES:
patent: 3833888 (1974-09-01), Stafford et al.
patent: 4686696 (1987-08-01), Lynch
patent: 5754870 (1998-05-01), Pollard et al.
patent: 5958056 (1999-09-01), Lehmann
patent: 6449348 (2002-09-01), Lamb et al.
patent: 2001-256040 (2001-09-01), None
Rakshani Vafa
Yousefi Nariman
Broadcom Corporation
Kim Paul L
McAndrews Held & Malloy Ltd.
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