Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2008-03-13
2010-11-16
Dole, Timothy J (Department: 2831)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S527000, C324S644000, C375S297000
Reexamination Certificate
active
07834638
ABSTRACT:
To provide a signal transmitting/receiving apparatus etc. where a cable length can be measured by using a general-purpose cable, without using an interface. A differential transmission circuit by the present invention includes a signal output circuit sending a high-speed differential signal and a pulse wave; a signal input circuit including a terminating resistor; a bias controller controlling a bias voltage on a transmission path; a terminating resistance controller disconnecting the terminating resistor on sensing a bias voltage and connecting it on sensing no bias voltage, by a bias sensing circuit; a sensing input circuit sensing a pulse wave reflected at the signal input circuit; and an output setting controller setting an electric characteristic of a signal outputted from the signal output circuit by a propagation time from sending the pulse wave by the signal output circuit to receiving the reflected pulse wave by the sensing input circuit.
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Japanese Office Action for JP Application No. 2007-083085 mailed Mar. 17, 2009.
Dole Timothy J
NEC Corporation
Zhu John
LandOfFree
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