Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1998-03-26
2000-09-05
Hudspeth, David R.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379412, 379900, 379324, 375258, 375257, 375285, H04B 300
Patent
active
061154687
ABSTRACT:
An Ethernet device power transmission system includes an input transformer, an output transformer and a pair of twisted pair conductors. The input transformer includes a pair of primaries for connection to a source of Ethernet data. The input transformer also includes a pair of secondaries, each having a center-tap. A first twisted pair conductor is connected across the first secondary, a second twisted pair conductor is connected across the second secondary and a DC-bias is provided between the respective center taps of the first and second secondaries. At the local end, the output transformer includes a first and second center-tapped primary and a first and second secondary for connection to the load device. The first and second primary center taps are connected to a power processor for extraction of DC power.
REFERENCES:
patent: 4723267 (1988-02-01), Jones et al.
patent: 5285477 (1994-02-01), Leonowich
patent: 5311518 (1994-05-01), Takato et al.
patent: 5541957 (1996-07-01), Lau
patent: 5574748 (1996-11-01), Vander Mey et al.
patent: 5799040 (1998-08-01), Lau
patent: 5994998 (1999-11-01), Fisher et al.
Chawan Vijay B
Cisco Technology Inc.
Hudspeth David R.
LandOfFree
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