WO2005114362A2 - Improved power delivery over ethernet cables - Google Patents
Improved power delivery over ethernet cables Download PDFInfo
- Publication number
- WO2005114362A2 WO2005114362A2 PCT/US2005/012656 US2005012656W WO2005114362A2 WO 2005114362 A2 WO2005114362 A2 WO 2005114362A2 US 2005012656 W US2005012656 W US 2005012656W WO 2005114362 A2 WO2005114362 A2 WO 2005114362A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- powered device
- wire pairs
- operable
- protocol
- Prior art date
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/953—Querying, e.g. by the use of web search engines
- G06F16/9537—Spatial or temporal dependent retrieval, e.g. spatiotemporal queries
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99931—Database or file accessing
- Y10S707/99937—Sorting
Definitions
- This invention relates in general to telecommunications, and more particularly to a method and system for improved power delivery over Ethernet cables.
- IEEE has issued a standard, IEEE 802.3af, that specifies methods of power delivery over Ethernet.
- the standard describes the use of two of the four pairs to deliver power to a powered device.
- an improved method for delivering power to powered devices would be useful .
- a method for power delivery includes coupling an Ethernet cable comprising four wire pairs to a power delivery system and providing power to a powered device on all of the wire pairs.
- a power delivery system includes an interface operable to couple to an Ethernet cable comprising four wire pairs and a controller operable to provide power to a powered device on all of the wire pairs.
- Important technical advantages of certain embodiments of the present invention include increased power to powered devices. Certain powered devices, such as wireless communication hubs or docking stations, may be able to make use of more power than provided by conventional power delivery systems. Certain embodiments of the present invention provide increased power for such applications .
- Certain embodiments of the present invention include supplying a variable power levels to a powered device. Certain embodiments of the present invention may provide different levels of power based on the power demand of the powered device or devices. Thus, such embodiments may be used in conjunction with a variety of devices with different power needs. Still other technical advantages of certain embodiments of the present invention include methods for determining the power level required by a powered device. Certain embodiments of the present invention include detecting the power level required by a device by communicating with the device. Accordingly, the power level may be adjusted based upon feedback from the powered device. Other technical advantages of the present invention will be readily apparent to one skilled in the art from the following figures, descriptions, and claims.
- FIGURE 1 illustrates a power delivery system in accordance with a particular embodiment of the present invention
- FIGURE 2 illustrates an example method of operation for the power delivery system of FIGURE 1.
- FIGURE 1 illustrates a power delivery system 100 for delivering power to one or more powered devices 102 using Ethernet grade cables, such as Ethernet cables 104.
- Ethernet cable 104 is any suitable cable set, such as category 3, 4, or 5 cable, used to communicate information using the Ethernet protocol to powered device 102, such as 10/l00BaseT Ethernet cable.
- Power delivery system 100 provides power to powered device 102 using up to all four of the pairs 106 (collectively referring to pairs 106A, 106B, 106C, and 106D) in Ethernet cable 104. In one embodiment, more than one pair 106 may be used by providing power through a plurality of ports each coupled to a particular pair 106.
- Powered device 102 is any suitable device that is powered at least partially by power delivered over Ethernet cables 104 by power delivery system 100.
- Powered device 102 may include devices such as a telephone, a personal computer (PC) , a personal digital assistant (PDA) , a laptop, a wireless network access point, or a docking station for one or more other powered devices such as those described above.
- Powered device 102 may include any suitable displays, interfaces, handsets, microphones, speakers, or other devices that may consume power.
- powered device 102 includes four ports 108A, 108B, 108C, and 108D (collectively referred to as "ports 108") .
- Each port 108 couples to one of the pairs 106 in Ethernet cable 104.
- Powered device 102 receives power from Ethernet cable 104 using power couplers 110A, HOB, HOC, and HOD (collectively referred to as "power couplers 110") .
- Power couplers 110 may be any suitable transformer, diode bridge, rectifier, or other component or collection of components for extracting power from Ethernet cable 104.
- power couplers 110 include diodes 112 and resistors 114.
- Diodes 112 allow power to be received from cable 104, while resistors 114 regulate the current flow from cable 104 to device 102 through each port 108. This reduces the risk that there will be a significant imbalance in the amount of power delivered through any particular port 108, which is turn minimizes the risk of overheated components, electrical arcs, and other- potential side effects of such an imbalance.
- Ethernet over four-pair cables functions in one of several modes: 10 megabits per second (10 Mbps) , 100 megabits per second (100 Mbps) , or one gigabit per second (1 Gbps, 1000 Mbps), for example. In 100 Mbps operation, two of the four pairs are used to communicate both information and power, while the remaining pairs are unused.
- Power delivery system 100 allows power to be delivered to powered device 102 using all four pairs 106 in Ethernet cable 104. By increasing the number of available wires used for power, power delivery system 100 allows more power to be delivered to powered device 102. On the other hand, power delivery system 100 may also damage devices if, after determining that it is appropriate to apply power to a device, system 100 applies power at a level that is not appropriate for the device being used. Accordingly, it is desirable to include methods for controlling the amount of power communicated to a particular device.
- power delivery system 100 includes an interface 116 having four ports 118A, 118B, 118C, and 118D (collectively referred to as "ports 118").
- each port 118 is coupled to a particular pair 106.
- more than one pair 106 may be coupled to a single port 118.
- Power delivery system 100 includes a controller 120 that controls an array of switches 122 (referring collectively to switches 122A, 122B, 122C, and 122D) in order to regulate the amount of current provided to ports 118 by power source 124.
- Power delivery system 100 also includes a data manager 126, which may include any hardware and/or software for exchanging information between a network 128, such as an Ethernet network, and powered device 102 using ports 118.
- Network 128 may include any suitable device or devices for communicating information in packets, cells, frames, segments, or other portions of information (collectively referred to as "packets"), which may be suitably converted to and from any suitable format by data manager 126.
- Interface 116 is any suitable physical interface for communicating electrical signals using Ethernet cable 104.
- Interface 116 communicates power as well as information received from data manager 126 to powered device 102.
- Interface 116 may be adaptable to 100 Mbps and 1 Gbps Ethernet operation, and may communicate power using any of its ports 118.
- Controller 120 represents any suitable microprocessor, microcontroller, or other hardware and/or software for controlling the operation of power delivery system 100.
- controller 120 controls switches 122.
- Diodes 112 are used in their respective power couplers 110 that ensure that the correct polarity voltage is connected to circuits within powered device 110.
- diodes 112 may be used as a switch, and may be substituted with any components for regulating the power delivered to ports 118, such as mechanical, magnetic, or electrical relays.
- Power source 124 may be any suitable source for providing voltage to ports 118.
- power delivery system 100 delivers power to powered device 102 using any or all of pairs 106.
- power delivery system 100 delivers power to powered device 102 using any or all of ports 118.
- power delivery system 100 delivers power to powered device 102 using one or more ports 118, where each port 118 is coupled to multiple pairs 106.
- controller 120 provides power to none, two, or four pairs 106.
- powered device 102 may need to include resistors 114 and/or diodes 112 in power couplers 110 to ensure that the correct voltage is connected to the circuits within powered device 102, and for regulating the amount of power received by a particular port 108 in order to prevent excessive power from being delivered to a single port 108.
- power delivery system 100 may deliver power using two pairs 106 if device 102 is configured to receive power from only two pairs 106 and may deliver power using four pairs 106 if device 102 is configured to receive power using all four pairs 106.
- power delivery system 100 may communicate with device 102 in order to determine the appropriate mode of operation.
- the communication between power delivery system 100 and device 102 may be accomplished in a variety of ways, and in general, any communication link allowing device 102 and system 100 to exchange power information may be used.
- Power information may include any suitable type of information, such as the number of pairs 106 to be powered or the amount of power to be supplied on each pair 106.
- power delivery system 100 may determine power characteristics for the device by monitoring the response of device 102 to voltage and current values on ports 118. For example, after detecting the power need of powered device 102, power delivery system 100 may initially transmit power using all ports 118 and reduce the number of ports 118 used to transmit power in response to detecting that the power is not being used by device 102. During operation of device 102, the power responses of device 102 may be monitored to determine more accurately the power usage characteristics of device 102. This information may be used to adjust the amount of power provided to one or more ports 118, thus permitting more efficient use of power overall. In other embodiments, power delivery system 100 may exchange information with device 102 using a communication protocol.
- the device discovery protocol may include power information for device 102.
- components of the network such as power delivery system 100, may automatically recognize the power requirements of device 102.
- Technical advantages of such embodiments may include flexibility and adaptability.
- Such information may be added to an already-existing discovery protocol, and the power information may be modified or expanded within the protocol as needed.
- device 102 and power delivery system 100 may exchange information using the connection established by the power delivery protocol. Examples of a power delivery protocol include CDP, and IEEE 802.3af classification; however, any protocol that is used for communicating information concerning power may be a power delivery protocol.
- power delivery system 100 may use a side band protocol or a side protocol associated with the power delivery protocol to exchange power information with device 102.
- a "side protocol" refers to a protocol that does not interfere with any pre-existing protocols.
- device 102 and system 100 may use otherwise-unused messages or classes in the power delivery protocol. As an illustration, reserved classes in the IEEE 802.3af standards could be used to communicate power information for device 102.
- Technical advantages include that the power level can be established before device power-on, and that the described techniques may be implemented by modifying already-existing communication protocols.
- One advantage of particular embodiments is adaptability to multiport devices. Thus, for example, a docking station could be coupled to an Ethernet jack.
- the amount of power provided by the jack - the power normally derived from a single power supply to ensure that safe electrical low voltage is present - could be adjusted based on the number of devices coupled to the docking station, so that the power could be increased as additional devices (such as PDAs or laptops) are coupled to the docking station or decreased as devices are removed.
- a wireless access point could be coupled to a jack, and the power could be increased or decreased based on the power usage of the wireless device, which may be influenced by factors such as the number of wireless devices in communication with the access point .
- Another advantage of particular embodiments is compatibility with advanced power management techniques.
- FIGURE 2 is a flow chart 200 illustrating one example of a method of operation for power delivery system 100.
- power delivery system 100 determines a power level for device 102, which may be in response to detecting that device 102 has been coupled to a network. This step may include providing power at a predetermined level and monitoring the response of device 102 to the power provided. Alternatively, power delivery system 100 may exchange power information with device 102 to determine a suitable power level. Controller 120 sets the power applied to ports 118 based on the determination of the power requirements of device 102 at step 204.
- Power delivery system 100 then monitors the power usage of device 102 at step 206. If there is no change in the power usage of device 102, then power delivery system 100 may continue to provide power and monitor power usage, as shown at decision step 208. If there is a change in the power usage of device 102, power delivery system 100 determines whether the device has been powered off or disconnected from the network at step 210. If device 102 has been powered off, then system 100 returns to a search for a powered device, and the method is at an end. If there has been a change in power usage other than device 102 being powered off or disconnected, power delivery system 100 determines a new power level for device 102 at step 202.
- power delivery system 100 may reduce the amount of power provided to device 102.
- device 102 may switch into a power-save mode, thus using less power, and power delivery system 100 may reduce the power delivered to device 102 accordingly.
- the method then repeats until device 102 is powered down or disconnected from the network.
- the described method of operation is only one of numerous possible methods of operation corresponding to various embodiments of power delivery system.
- particular methods of operation could involve setting the power level initially without modifying the power level in response to changes in power usage by device 102.
- the steps of the described method may be performed in any suitable order, and particular steps may be added ' , rearranged, or omitted.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT05735231T ATE491177T1 (en) | 2004-05-13 | 2005-04-15 | IMPROVED POWER DELIVERY VIA ETHERNET CABLE |
CN2005800132512A CN101069146B (en) | 2004-05-13 | 2005-04-15 | Improved power delivery over Ethernet cables |
EP05735231A EP1769315B1 (en) | 2004-05-13 | 2005-04-15 | Improved power delivery over ethernet cables |
DE602005025220T DE602005025220D1 (en) | 2004-05-13 | 2005-04-15 | Thernet-kabel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/845,021 | 2004-05-13 | ||
US10/845,021 US7603570B2 (en) | 2004-05-13 | 2004-05-13 | Power delivery over ethernet cables |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005114362A2 true WO2005114362A2 (en) | 2005-12-01 |
WO2005114362A3 WO2005114362A3 (en) | 2007-02-22 |
Family
ID=35426788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/012656 WO2005114362A2 (en) | 2004-05-13 | 2005-04-15 | Improved power delivery over ethernet cables |
Country Status (6)
Country | Link |
---|---|
US (2) | US7603570B2 (en) |
EP (1) | EP1769315B1 (en) |
CN (1) | CN101069146B (en) |
AT (1) | ATE491177T1 (en) |
DE (1) | DE602005025220D1 (en) |
WO (1) | WO2005114362A2 (en) |
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- 2005-04-15 EP EP05735231A patent/EP1769315B1/en active Active
- 2005-04-15 WO PCT/US2005/012656 patent/WO2005114362A2/en active Application Filing
- 2005-04-15 DE DE602005025220T patent/DE602005025220D1/en active Active
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US20100023784A1 (en) | 2010-01-28 |
DE602005025220D1 (en) | 2011-01-20 |
US7921314B2 (en) | 2011-04-05 |
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ATE491177T1 (en) | 2010-12-15 |
WO2005114362A3 (en) | 2007-02-22 |
EP1769315B1 (en) | 2010-12-08 |
US7603570B2 (en) | 2009-10-13 |
US20050268120A1 (en) | 2005-12-01 |
CN101069146B (en) | 2012-03-21 |
CN101069146A (en) | 2007-11-07 |
EP1769315A4 (en) | 2009-04-29 |
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