High power classification for power over Ethernet

• US 7,460,889 B2
• Filed: 02/10/2005
• Issued: 12/02/2008
• Est. Priority Date: 10/16/2003
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Microsemi Corp. - Analog Mixed Signal Group, Ltd. (Microchip Technology Incorporated)
• Inventors: Darshan, Yair, Ferentz, Alon
• Primary Examiner(s): Le; Nhan T
• Application Number:
  US11/053,872
• Publication Number:
  US 20050197094A1
• Time in Patent Office: 1,391 Days
• Field of Search: 307/64, 307/65, 307/70, 307/116, 307/43, 455/343.1, 455/402, 455/572, 370/395.53
• US Class Current: 455/572
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities

Abstract

A method for determining the classification of a powered device, the method comprising: obtaining a first classification over a first power path; obtaining a second classification over a second power path; comparing the obtained first classification with the obtained second classification; and in the event the obtained first classification is different from the obtained second classification determining a combined classification as a decoded value of the obtained first classification and the obtained second classification.

Claims

1. Power sourcing equipment arrange to provide power via a plurality of output ports for connection over communication cabling to a single powered device, the power sourcing equipment comprising:

a first power source operative to provide power via a first output port of the plurality of ports;

a second power source operative to provide power via a second output port of the plurality of ports, said second output port different from said first output port;

a control circuit;

said control circuit being operative to obtain a first classification information indicative of the power requirements of the single powered device via said first output port and a second classification information indicative of the power requirements of the single powered device via said second output port and in the event that said obtained first classification information does not equal said obtained second classification information to identify the connected single powered device as a powered device capable of receiving power over a combination of said first output port and said second output port.

2. Power sourcing equipment according to claim 1, wherein said control circuit is further operative to determine a combined classification of the power requirements for the powered device said combined classification being a decoded result of said obtained first classification information and said obtained second classification information.

3. Power sourcing equipment according to claim 2, wherein in the event that said obtained first classification information equals said obtained second classification information said control circuit is operative to provide power to the single powered device via only one of said first output port and said second output port.

4. Power sourcing equipment according to claim 1, wherein in the event that said first classification information equals said second classification information said control circuit is operative to provide power to the single powered device via only one of said first output port and said second output port.

5. Power sourcing equipment according to claim 1, wherein the event that said obtained first classification information does not equal said obtained second classification information said control circuit is further operative to provide power to the single powered device via said combination of said first output port and said second output port.

6. Power sourcing equipment arranged to provide power via a plurality of output ports for connection over communication cabling to a single powered device, the power sourcing equipment comprising:

a first power source operative to provide power to the single powered device via a first output port of the plurality of ports;

a second power source operative to provide power to the single powered device via a second output port of the plurality of ports, said second output port different from said first output port;

a control circuit;

said control circuit operative to obtain a first classification information indicative of the power requirements of the single powered device via said first output port and a second classification information indicative of the power requirements of the single powered device via said second output port and to determine a classification of the power requirements of the single powered device as a result of said obtained first classification information and said obtained second classification information.

7. Power sourcing equipment according to claim 6, wherein said classification of the power requirements of the single powered device is a decoded result of said first classification information and said second classification information.

8. Power sourcing equipment according to claim 7, wherein in the event that at least one of said first obtained classification information and said obtained second classification information is indicative that the single powered device is a high power powered device, said control circuit is operative to provide power via both said first output port and said second output port.

9. Power sourcing equipment according to claim 6, wherein said control circuit is further operative to simultaneously detect a powered device via said first and second output ports.