Data communication network providing power over network connections with node identification functionality

• US 6,985,713 B2
• Filed: 07/18/2002
• Issued: 01/10/2006
• Est. Priority Date: 01/12/1999
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: PowerDsine Limited (Microchip Technology Incorporated)
• Inventors: Pincu, David, Darshan, Yair, Ferentz, Alon, Korcharz, Dror, Lehr, Amir, Atias, Ilan, Barnea, Nadav
• Primary Examiner(s): Corsaro, Nick
• Application Number:
  US10/198,831
• Publication Number:
  US 20030036819A1
• Time in Patent Office: 1,272 Days
• Field of Search: 455/423, 455/424, 455/522, 455/69, 455/574, 455/343.2, 455/343.5, 455/343, 370/241, 370/252, 370/245, 700/300
• US Class Current: 455/343.5
• CPC Class Codes: G05F 1/66 Regulating electric power
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: H02G 3/00 Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles installations of bus-bars H02G5/00; overhead installations H02G7/00; installations in or on the ground H02G9/00
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 12/44 Star or tree networks
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 19/08 with current supply sources at the substations generating ringing current H04M19/04

Abstract

This invention discloses a data communications network including at least one hub, a plurality of nodes connected via network connections to the hub, a power distribution subsystem operative to provide at least some power to at least some of the plurality of nodes via at least some of the network connections. The power distribution subsystem includes a node identification functionality providing identification of nodes via at least some of the plurality of network connections in order to enable an appropriate supply of power to individual nodes and a power supply responsive to the node identification functionality and supplying power to the at least some of the plurality of nodes via the at least some of the network connections.

Claims

1. A data communications network comprising:

at least one hub;

a plurality of nodes connected via network connections to said at least one hub,

each of said network connections comprising at least one twisted pair,

each of said nodes comprising a node-resident node identification functionality comprising a precise resistor operatively connected to said at least one twisted pair, said precise resistor having no function in the node other than as part of said node-resident node identification functionality; and

a power distribution subsystem operative to provide at least some power to at least some of said plurality of nodes via at least some of said network connections,

said power distribution subsystem including;

a node identification functionality providing identification of nodes at least partially by detecting a unique relationship between voltage and current associated with said precise resistor via said at least one twisted pair of said some of said plurality of network connections in order to enable an appropriate supply of power to individual nodes; and

a power supply responsive to said node identification functionality to supply power to said at least some of said plurality of nodes via said at least one twisted pair of said some of said network connections.

2. A data communications network according to claim 1 and also comprising node-specific power allocation functionality, which is operative, responsive to an output from said node identification functionality, to provide power only to nodes identified to be appropriate for receiving power via said at least some of said network connections, thereby to prevent inappropriate supply of power to inappropriate nodes.

3. A data communications network according to claim 1 and also comprising node-specific power allocation functionality, which is operative, responsive to an output from said node identification functionality, to provide power to nodes in accordance with a predetermined priority.

4. A data communications network according to claim 1 and wherein said supplied power is provided over said at least one twisted pair, and said node identification functionality employs a plurality of voltage levels at a plurality of times along said at least one twisted pair.

5. A data communication network according to claim 1, wherein said at least some of said plurality of nodes being supplied power are operative to operatively disconnect said precise resistor from said at least one twisted pair after said identification.

6. A data communication network according to claim 1, wherein said node-resident node identification functionality provides one of plurality of possible outputs, each of said plurality of possible outputs being associated with a respective required level of power.

7. A data communication network according to claim 4, wherein said plurality of voltage levels are of a single polarity.

8. A data communications network comprising:

at least one hub;

a plurality of nodes connected via network connections to said at least one hub;

a power distribution subsystem operative to provide at least some power to at least some of said plurality of nodes via at least some of said network connections, said power distribution subsystem including;

a node identification functionality providing identification of more than two types of nodes via said at least some of said plurality of network connections in order to fulfill more than two different power requirements corresponding to said more than two types of nodes;

each of said plurality of nodes comprising a node-resident node identification functionality associated with said node identification functionality, said node-resident node identification functionality having no function in the node other than as part of said node-resident node identification functionality, wherein said node-resident node identification functionality is disabled following operation thereof; and

a power supply responsive to said node identification functionality and supplying power to said at least some of said plurality of nodes via said at least some of said network connections.

9. A data communication network according to claim 8, wherein said node-resident node identification functionality comprises a precise resistor.

10. A data communications network according to claim 9, and wherein said node-resident node identification functionality is periodically enabled following disabling thereof.

11. A data communication network according to claim 8, wherein said node-resident node identification functionality comprises an electrical switch.

12. A data communication network according to claim 8, wherein said power supply is operative to supply power in accordance with a selected power level from among a plurality of power levels, said selected power level being selected in accordance with said node-resident node identification functionality.