06535983 is referenced by 279 patents.

According to the invention, an Ethernet system and method of using an Ethernet system is provided including a network side device (a hub/switch/concentrator), and a plurality of end devices (either a standard end device powered locally or a system powered device), connected to the hub/switch. The system powered devices have circuitry for indicating the system power need to the hub, which has a power source for selectively supplying system power over the Ethernet. A stimulus device associated with the network device sends a stimulus signal over the network connection lines during a detection phase. The need for power is signaled by an indication device associated with the system powered end devices, providing an indication signal in response to the stimulus signal. A detector associated with the network side detects the indication signal thus triggering the power source to supply system power to each of the end devices that is a system powered device and not to each of the end devices that is a standard device.

Title
System and method for signaling and detecting request for power over ethernet
Application Number
9/435722
Publication Number
6535983 (B1)
Application Date
November 8, 1999
Publication Date
March 18, 2003
Inventor
Nicholas Mark Stapleton
Uxbridge
US
Paul Francis Dryer
Medway
MA, US
Michael S McCormack
Gloucester
MA, US
Agent
McGlew and Tuttle P C
US
Assignee
3Com Corporation
CA, US
IPC
G06F 1/26
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