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System and method for power supply of Ethernet

A technology of power supply system and Ethernet, applied in transmission system, wired transmission system, circuit layout of AC and DC network, etc., can solve problems such as total power limitation

Active Publication Date: 2008-06-25
AVAGO TECH INT SALES PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, the total amount of power that can be allocated to individual PDs is limited by the capacity of the PSE

Method used

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  • System and method for power supply of Ethernet
  • System and method for power supply of Ethernet
  • System and method for power supply of Ethernet

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Embodiment Construction

[0041] Various embodiments of the invention are discussed in detail below. It should be understood that the discussion of the specific embodiments is for descriptive purposes only. It will be appreciated by those skilled in the art that other elements and configurations may be used without departing from the spirit and scope of the invention.

[0042] Figure 1 shows an embodiment of a Power over Ethernet (PoE) system. As shown, the PoE system includes a power source equipment (PSE) 120 that delivers power to a powered device (PD) 140 . The power delivered by the PSE to the PD is provided by applying a voltage across the center leg of the transformer connected to the transmit (TX) and receive (RX) pairs carried within the Ethernet cable. Two TX and RX pairs are used for data communication between Ethernet PHYs 110 and 130 .

[0043] As further shown in FIG. 1 , PD 140 includes an 802.3af module 142 . This module includes electronics that enable PD 140 to communicate with PS...

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Abstract

A system and method for discovering a cable type and resistance for Power over Ethernet (PoE) applications. Cabling power loss in PoE applications is related to the resistance of the cable itself. A PHY can be designed to measure electrical characteristics (e.g., insertion loss, cross talk, length, etc.) of the Ethernet cable to enable determination of the cable resistance. The determined resistance can be used in powering decisions and in adjusting power budgets allocated to power source equipment ports.

Description

technical field [0001] The present invention relates to methods of network cabling systems, and more particularly to a system and method of discovering cable types for Power over Ethernet (PoE) applications. Background technique [0002] The IEEE 802.3af PoE standard provides a framework for transferring power from a power source equipment (PSE) to a powered device (PD) over Ethernet cabling. In this PoE process, effective device detection is performed first. This detection process identifies whether the power supply device is connected to a valid device to ensure that power is not provided to non-PoE enabled devices. [0003] After finding a valid PD, the PSE optionally performs power classification. IEEE 802.3af defines five power classes for PD devices. Completion of the power classification process allows the PSE to manage the power to be delivered to individual PDs connected to the PSE. If it is identified that a particular power level is available for a particular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J4/00H02M3/06H04L12/10H04B3/466
Inventor 韦尔·威廉·戴博明夏因·希赫
Owner AVAGO TECH INT SALES PTE LTD