Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2005-06-24
2009-10-06
Smith, Creighton (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S307000, C379S322000, C379S323000, C709S228000
Reexamination Certificate
active
07599485
ABSTRACT:
A discovery technique employs a single-conductor-pair identity circuit for a remotely powered device. A communications system includes a first communications device (e.g. and IP telephony switch) capable of supplying power at an interface, and a second communications device coupled to the interface via a multiple-conductor-pair cable. The second communications device may be a terminal device such as an IP telephone or an intermediate device such as a re-wiring device or a mid-span power supply. The first communications device includes a single-pair identity signal generator that generates a single-pair identity signal on one conductor pair of the cable, and a single-pair sensor operative to sense a conduction characteristic of the conductor pair indicative of the presence of a single-pair identity circuit. The second communications device includes the single-pair identity circuit coupled to the conductor pair and activated by the single-pair identity signal to create the predetermined conduction characteristic. Examples of single-pair identity circuits include circuits employing zener diodes and other physical-layer circuit elements.
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BainwoodHuang
Cisco Technology Inc.
Smith Creighton
LandOfFree
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