Power supply for phantom-feed LAN connected device using spare-pair powering

• US 7,030,733 B2
• Filed: 01/22/2003
• Issued: 04/18/2006
• Est. Priority Date: 01/22/2002
• Status: Active Grant

• Current Assignee: Mitel Networks Corporation
• Original Assignee: Mitel Knowledge Corporation (Mitel Networks Corporation)
• Inventors: Abbarin, Hamidreza
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): Blount, Eric
• Application Number:
  US10/348,839
• Publication Number:
  US 20030162449A1
• Time in Patent Office: 1,182 Days
• Field of Search: 340/310.11
• US Class Current: 370/200
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04M 19/00 Current supply arrangements for telephone systems for selecting-equipment H04Q1/28

Abstract

A system for providing power to a local area network LAN connected device via spare wire pairs from a phantom feed LAN, the system comprising a first connector for connecting to the LAN connected device; a second connector for connecting to a LAN hub; and means for redirecting current from signaling wires of said second connector to at least one spare wire pair of said first connector.

Claims

1. A system for providing power to a local area network LAN connected device via spare wire pairs from a phantom feed LAN, the system comprising:

a first connector for connecting to said LAN connected device;

a second connector for connecting to a LAN hub; and

means for redirecting current from signaling wires of said second connector to at least one spare wire pair of said first connector.

2. The system for providing power to a LAN connected device according to claim 1 wherein said means for redirecting current comprises at least one autotransformer between said signaling wires and said at least one spare wire pair.

3. The system for providing power to a LAN connected device according to claim 1 wherein said means for redirecting current redirects current to two spare wire pairs.

4. The system for providing power to a LAN connected device according to claim 3 wherein said means for redirecting current comprises a pair of autotransformers, each autotransformer being disposed between said signaling wires and said spare wire pair for preventing phantom-feed current from passing to a transformer in said device.

5. The system for providing power to a LAN connected device according to claim 4 wherein said first connector is an RJ-45 jack.

6. The system for providing power to a LAN connected device according to claim 5 wherein said second connector is an RJ-45 jack.

7. The system for providing power to a LAN connected device according to claim 6 wherein said spare wire pairs corresponds to pair 4/5 and pair 7/8 of said first connector.

8. The system for providing power to a LAN connected device according to claim 7 wherein said signaling wires correspond to transmit and receive wires of said device.