CN101156355B - Detecting legacy powered devices in a power over ethernet system - Google Patents
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- CN101156355B CN101156355B CN2006800093508A CN200680009350A CN101156355B CN 101156355 B CN101156355 B CN 101156355B CN 2006800093508 A CN2006800093508 A CN 2006800093508A CN 200680009350 A CN200680009350 A CN 200680009350A CN 101156355 B CN101156355 B CN 101156355B
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- Y02B70/325—
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- Y02B70/3275—
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- Y02B90/2638—
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- Y02B90/2646—
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- Y02B90/2653—
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- Y02B90/2669—
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- Y04S20/228—
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
- Y04S20/244—Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Y04S40/125—
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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Abstract
A novel system and method for detecting Powered Devices (PDs) in a Power over Ethernet (PoE) system. The PD probing circuitry generates a detection signal provided to P and determines a PD response signal generated in response to the detection signal. Based on the PD response signal, the control circuit determines a detection value for identifying the PD. Specifically, the control circuit concludes that the PD is a device that satisfies the Po standard if the detection value is within a first predetermined range, and concludes that the PD is a conventional PD device if the detection value is outside a second predetermined range that is outside the first predetermined range.
Description
The name that the application requires to submit on January 25th, 2005 is called the priority of No. the 60/646th, 509, the U.S. Provisional Patent Application of " system and method (SYSTEM AND METHOD FOR SUPPORTING ADVANCED POWEROVER ETHERNET SYSTEM) of supporting senior Power over Ethernet system ".
Technical field
The present invention relates to a kind of electric power system, more particularly, relate to the circuit and the method that are used for detecting the traditional power consumption equipment of Power over Ethernet (PoE) system (PD).
Background technology
In recent years, Ethernet has become the most frequently used method of local area network (LAN).802.3 groups of IEEE, the promoter of ethernet standard has developed the extension form of this standard, is called IEEE 802.3af, and definition is powered by Ethernet cable.IEEE 802.3af standard definition Power over Ethernet (PoE) system, the twisted-pair feeder that relates to by non-shielding is transferred to the power consumption equipment (PD) that is positioned at the link opposite side with electric power from power supply unit (PSE).Traditionally, the network equipment is IP phone for example, Wireless LAN access point, and the personal computer and the Internet camera needs two connections: one is connected to LAN, and another is connected to electric power system.The PoE system has been eliminated needs extra socket and wiring, to power to the network equipment.The substitute is, by being used for the Ethernet cable power supply of transfer of data.
Defined as IEEE 802.3af standard, PSE and PD are non-data entities, allow the network equipment use cable power supply similar with being used for transfer of data and obtain electric power.PSE is the equipment that is electrically connected to cable at physical point of attachment, and it is powered to link.PSE usually and Ethernet switch, router, hub or other network switching equipment or in stride power supply unit and link to each other.PD is the equipment that obtains power supply or request power supply.PD can with for example digital IP phone, wireless network access point, PDA or notebook computer docking station, charger for mobile phone links to each other with equipment such as HVAC thermostats.
The major function of PSE is that the PD for request power supply searches link, alternatively to the PD classification, if detect PD then to described link power supply, and the power supply on the monitoring link, and when no longer asking and needing, cut off the electricity supply.PD participates in the PD trace routine by presenting by the defined PoE detection signal of IEEE 802.3af standard.The PD detection signal has the electrical characteristic of being measured by PSE, for example signal resistance in 19-26.5K Ω scope.
But, some PD that made before the approval of IEEE 802.3af standard does not have IEEE 802.3af standard detection signal.These PD are known as traditional PD.For example, some traditional PD can have big electric capacity and the PoE detection signal of at least one series diode as them.Other traditional PD can be used the PoE detection signal of data loopback as it.Described data loopback relate to be not directly used in line that PD detects between smaller capacitive.
Although wish that they can not be detected to traditional PD power supply in conventional PD testing process.Therefore, need to support to detect the PD detection scheme of traditional PD.
Summary of the invention
The invention provides novel system and method, be used for detecting the power consumption equipment (PD) of Power over Ethernet (PoE) system.PD detects circuit and generates detection signal and the definite PD response signal that responds described detection signal and produce that offers PD.According to the PD response signal, control circuit determines that detected value is used to discern PD.Specifically, if control circuit is inferred detected value at first preset range, then PD is the equipment that satisfies the PoE standard, and if the deduction detected value be second preset range outside first preset range, then PD is traditional PD equipment.
According to an aspect of the present invention, described control circuit can be made comparisons detected value and predetermined threshold, to determine whether PD is legacy equipment.For example, if detected value is negative or less than predetermined threshold, wherein said predetermined threshold can be less than the minimum value of first preset range, then discerning PD is legacy equipment.
According to embodiments of the invention, described detected value can comprise detection resistance value.Control circuit can determine that PD is traditional PD equipment, if detection resistance value is for negative or less than threshold resistance value.Described threshold resistance value can be less than the minimum acceptable value of the signal resistance that defines in the IEEE 802.3af standard.
PD detects circuit can produce the first detection electric current, is subsequently to detect second of electric current less than first to detect electric current.If respond second response voltage that first response voltage that first electric current produced is produced less than response second electric current, then control circuit can detect traditional PD equipment.
In addition, if first response voltage greater than second response voltage, but the difference between these voltages is less than preset threshold value, then control circuit can detect traditional PD equipment.
For example, when by the detection resistance value of the difference between first response voltage and second response voltage definition for negative or less than the predetermined threshold value resistance value, it can be less than the minimum signal resistance value by the PoE standard definition, then control circuit can detect legacy equipment.
The method according to this invention, carry out following step and detect PD in the PoE system:
-produce the detection signal offer PD, with determine the PD response signal and
-according to the PD response signal, if if detected value at first preset range determine PD be satisfy the equipment of PoE standard and detected value outside first scope second preset range determine that PD is a traditional PD equipment.
The step that produces detection signal can comprise generation first detection signal, is second detection signal that has than the littler value of first detection signal subsequently.When by response first response signal that first detection signal produced and the detection resistance value that responds the difference definition between second response signal that second detection signal produces for negative or less than threshold resistance value, then detect legacy equipment.
For a person skilled in the art, other advantages of the present invention and aspect will become apparent by following detailed description, shown in it and described embodiments of the invention, just realize optimal mode of the present invention by illustrating.As mentioned below, the present invention can have other and different embodiment, and its some details can be improved aspect various without departing from the premise in the spirit of the present invention.Therefore, accompanying drawing and explanation should be considered to descriptive, and nonrestrictive.
Description of drawings
In conjunction with following accompanying drawing can be best the following detailed description of understanding the embodiment of the invention, wherein feature is unnecessary proportionally draws, but draws with the form that the best illustrates correlated characteristic, wherein:
Fig. 1 is the block diagram that the example system that is used to detect PD according to the present invention is shown.
Fig. 2 is Nuo Dun (Norton) equivalent electric circuit of detection resources.
Fig. 3 is a flow chart, and the control algolithm of the system operation that is used for the control detection traditional PD is shown.
Embodiment
The present invention will traditional PD be that example describes in the PoE system to detect.But, apparent, but design described herein can be used for discerning any connection device by the electric power system power supply.
Fig. 1 shows the simplified block diagram of the PD detection system 10 of the present invention in the PoE system, comprises PSE 12 and can be connected to the PD 14 of PSE 12 by link 16, and described link for example is the 2-wired link that defines in the IEEE802.3af standard.PD detection system 10 comprises detection resources 18 and controller 20, can be placed among the PSE 12.
Fig. 2 illustrates the Norton equivalent circuit of detection resources 18, and it comprises current source 22, source resistance R sc that is connected in parallel with current source 22 and the voltage monitor 24 that is connected in parallel with source resistance R sc.
In the each test that detects PD 14, detection resources 18 produces and detects electric current I det, and the voltage range that it defines in can corresponding IEEE 802.3af standard is at the detection voltage Vdet of 2.8V-10V.The scope of source resistance R sc is at 100Kohm-100Mohm.The different Vdet voltage differences that detect the corresponding 1V of minimum current difference between the value of testing the detection electric current I det that is produced.
The voltage Vres that the detection electric current I det that voltage monitor 24 definite responses offer PD14 is produced.The detection resistance R det of PD 14 is defined as:
Rdet＝ΔVres/ΔIdet，
Wherein Δ Idet is the difference that detects in the different tests between the electric current, and Δ Vres is the difference that responds between the voltage that detects electric current separately and produced.
Fig. 3 is a flow chart, shows the control algolithm of being carried out by controller 24, makes PD detection system 10 can detect traditional PD, and wherein said traditional PD can be the PD with the desired detection signal of IEEE 802.3af standard.For example, some traditional PD can have big electric capacity and the PoE detection signal of at least one series diode as them.Other traditional PD can use the data loopback as its PoE detection signal.This data loopback relate to be not directly used in line that PD detects between smaller capacitive.
The PD trace routine begins (step 102) afterwards, and controller 20 request detection sources 18 generate detects electric current I
1For example, can produce the electric current of 240mA.After the default stand-by period for example equaled 160ms, control detection source 18 was so that voltage monitor 24 can be measured the electric current I that response offers PD 14
1The voltage V that is produced
1(step 104).
After this, controller 20 request detection sources 18 generate less than electric current I
1The detection electric current I
2For example, electric current I
2Can equal 180mA.After the default stand-by period for example equaled 160ms, request voltage monitor 24 was measured the electric current I that response offers PD 14
2And the voltage V that produces
2(step 106).
According to the response voltage V that measures
1And V
2, the detection resistance R det that calculates PD 14 at step 108 controller 20 is as follows:
Rdet＝(V
1-V
2)/(I
1-I
2)，
And determine the detection resistance R det calculated whether in the acceptable scope of IEEE 802.3af standard, 17K Ω-30K Ω (step 110) for example.If controller 20 infers that PD14 is the equipment (step 112) that meets IEEE 802.3af standard.
If the detection resistance R det that is calculated is outside the acceptable scope of IEEE 802.3af standard, then controller 20 determines that PD14 is can be by the legacy equipment of PSE 12 power supplies.For example, if PD 14 is the legacy equipments with big electric capacity (for example greater than 47 μ F) and diode and this capacitances in series, owing to charging to big electric capacity, the second voltage V that measures
2Can be greater than voltage V
1If electric capacity is very big, the voltage V of two measurements then
1And V
2Can have value much at one.Difference between these voltages can be restricted to the bucking voltage that the forward voltage drop by the series diode two ends causes.
If PD 14 has smaller capacitive (for example in the scope of 1 μ F-33 μ F) and a resistance legacy equipment in parallel with this electric capacity, then according to the size of electric capacity, resistance value, the detection electric current I that is produced
1And I
2Value, and voltage V
1And V
2Time period between the measurement, the second voltage V that measures
2May be greater than maybe being not more than voltage V
1The voltage V that bucking voltage caused that combination produced of electric capacity and parallel resistance when but, utilization is charged by electric capacity
1And V
2Between difference, can discern the PD 14 that is connected is legacy equipments.
Therefore, if response detects electric current I less than first
1Second detect electric current I
2And the second measuring voltage V that produces
2Greater than the first measuring voltage V
1, then controller 20 can conclude that the PD14 that is connected is a legacy equipment.
In addition, if voltage V
1Greater than voltage V
2, controller 20 can be made comparisons the threshold voltage of difference between these voltages and preliminary election, the detection electric current I that the corresponding response of the threshold voltage of wherein said preliminary election provides continuously
1And I
2And the bucking voltage that produces.If voltage V
1And V
2Between difference less than threshold voltage, controller 20 can conclude that the PD that connected 14 is legacy equipment.
According to embodiments of the invention, if the detection resistance R det that calculates in the step 108 is outside the acceptable scope of IEEE802.3af standard, then controller 20 will detect resistance and make comparisons with the threshold resistance Rth of corresponding pre-selected threshold voltage, to detect traditional power consumption equipment (step 114) that can be connected to PSE 12.For example, threshold resistance Rth can equal 6K Ω.
If detect resistance R det, or be negative value (expression voltage V less than threshold resistance Rth
2Greater than voltage V
1), then controller 20 concludes that the PD 14 that is connected is can be by the legacy equipment (step 116) of PSE 12 power supplies.Not negative value or be not less than threshold resistance Rth that then controller 20 is determined the equipment that is connected neither meet the PD of IEEE 802.3af standard if detect resistance R det, neither be by the traditional PD (step 118) of PSE 12 power supplies.
Therefore, except that IEEE 802.3af standard acceptable first detects the resistance range, controller 20 checks that second of preliminary election detects resistance range, to detect the legacy equipment that can be connected to PSE 12.As mentioned above, second detection range can cover, and for example, the detection resistance or the value of negative value are less than predetermined threshold value resistance.If the detection resistance Pdet of the PD 14 that is connected is in second scope, the PD 14 that is connected is considered to legacy equipment.As a result, PSE 12 not only can detect the power consumption equipment that meets IEEE 802.3af standard, can also detect the legacy equipment that needs power supply.
Above stated specification illustrates and has described aspect of the present invention.In addition, the present invention only illustrates and has described preferred embodiment, but as previously mentioned, should be appreciated that the present invention can be used in various other combinations, improves, and environment, and can conceive in the present invention of this paper statement and make amendment in the scope and improve, with above-mentioned instruction, and/or the technology of association area or ken are suitable.
Above-described embodiment also is further used for explaining realization optimal mode of the present invention, and can make those skilled in the art pass through to realize the present invention, and carry out various modifications according to the needs of special applications of the present invention or purposes with this mode or other execution mode.
Therefore, this specification is not to tend to the present invention is defined as form disclosed herein.In addition, appended claims is appreciated that and comprises interchangeable embodiment.
Claims (20)
1. system that is used for to the power supply of the power consumption equipment (PD) of Power over Ethernet (PoE) system comprises:
PD detects circuit, being used for providing first to detect electric current to PD, is to detect second of electric current less than first to detect electric current subsequently, and is defined as responding first and detects electric current and first response voltage that produces, with for respond second detect second response voltage that electric current produces and
Control circuit is used to detect and utilizes the traditional PD of electric capacity as detection signal, and described control circuit detects traditional PD according to the difference between first response voltage and second response voltage.
2. system according to claim 1, wherein, described control circuit is set up:
With determine PD whether be meet the PoE standard equipment and
If PD is not the equipment that meets the PoE standard, determine then whether PD is traditional PD.
3. system according to claim 1, wherein, described control circuit is set up by being made comparisons by the detected value and the predetermined threshold value of the definition of the difference between first response voltage and second response voltage, detects traditional PD.
4. system according to claim 1, wherein, described control circuit is set up when the difference between first response voltage and second response voltage is negative value, detects traditional PD.
5. system according to claim 1, wherein, described control circuit be set up when first response voltage greater than second response voltage, and during less than predetermined threshold value, detect traditional PD by the detected value of the difference between first response voltage and second response voltage definition.
6. system according to claim 1, wherein, described control circuit is set up when during less than the predetermined threshold value resistance value, detecting traditional PD by the detection resistance value of the difference between first response voltage and second response voltage definition.
7. system according to claim 6, wherein, described predetermined threshold value resistance value is less than the minimum signal resistance value by the PoE standard definition.
8. the method for power consumption equipment (PD) power supply in Power over Ethernet (PoE) system comprises the steps:
Generation offers first detection signal of PD, be second detection signal that has littler value than first detection signal subsequently, first response signal that produces to be defined as responding first detection signal and for respond second response signal that second detection signal produces and
According to the detected value by the definition of the difference between first response signal and second response signal, if determine detected value at first preset range, then PD is the equipment that satisfies the PoE standard;
If detected value outside first preset range, according to detected value, determines whether PD is to utilize the legacy equipment of electric capacity as detection signal.
9. method according to claim 8 wherein, when detected value during less than predetermined value, detects legacy equipment.
10. method according to claim 9, wherein, described predetermined value is less than the minimum signal resistance value by the PoE standard definition.
11. method according to claim 8 wherein, when detected value is negative value, detects legacy equipment.
12. method according to claim 8 wherein, when first response signal during less than second response signal, detects legacy equipment.
13. method according to claim 8, wherein, when first response signal greater than second response signal, and the difference between first response signal and second response signal detects legacy equipment during less than preset threshold value.
14. the power supply unit (PSE) of a Power over Ethernet (PoE) system comprises:
Power consumption equipment (PD) detection resources is used to produce and offers first of PD and detect electric current, detect second of electric current less than first and detect electric current to determine first response voltage and to be used to produce, with determine second response voltage and
Testing circuit is used to detect and utilizes the traditional PD of electric capacity as detection signal, and described testing circuit determines that according to the detection resistance value of the result's definition that is deducted the second response voltage value by the first response voltage value PD is a traditional PD.
15. PSE according to claim 14 wherein, when detection resistance value is negative value, detects traditional PD.
16. PSE according to claim 14 wherein, when described testing circuit also is set up in detection resistance value is the signal resistance scope that is requiring, detects the PD that satisfies IEEE 802.3 standard-requireds.
17. PSE according to claim 14, wherein, when detection resistance value less than predetermined value, and described predetermined value detects traditional PD less than by the minimum signal resistance value of IEEE802.3 standard definition the time.
18. system according to claim 1, wherein, described control circuit is configured to detect the traditional PD of being powered by the system that is used to power.
19. method according to claim 8, wherein, described legacy equipment is the equipment of being powered by the power supply unit in the PoE system.
20. PSE according to claim 14, wherein, described control circuit is configured to detect the traditional PD by the PSE power supply.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64650905P | 2005-01-25 | 2005-01-25 | |
| US60/646,509 | 2005-01-25 | ||
| US11/252,607 | 2005-10-19 | ||
| US11/252,607 US7856561B2 (en) | 2005-01-25 | 2005-10-19 | Detecting legacy powered device in power over ethernet system |
| PCT/US2006/000344 WO2006081047A1 (en) | 2005-01-25 | 2006-01-09 | Detecting legacy powered device in power over ethernet system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101156355A CN101156355A (en) | 2008-04-02 |
| CN101156355B true CN101156355B (en) | 2011-05-25 |
Family
ID=39023514
Family Applications (13)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800093495A Expired - Fee Related CN101147357B (en) | 2005-01-25 | 2006-01-09 | High power foldback mechanism in a system powered over a communication link |
| CN2006800093508A Active CN101156355B (en) | 2005-01-25 | 2006-01-09 | Detecting legacy powered devices in a power over ethernet system |
| CNA2006800054630A Pending CN101124771A (en) | 2005-01-25 | 2006-01-09 | Power supply device with an auto-zero circuit for determining and controlling the output current |
| CN200680005472.XA Active CN101124775B (en) | 2005-01-25 | 2006-01-09 | Dual mode detection of powered devices in a power over ethernet system |
| CN2006800031925A Active CN101112042B (en) | 2005-01-25 | 2006-01-09 | System and method for distinguishing short circuit state of network interface card and power over ethernet system |
| CNA200680003193XA Pending CN101129019A (en) | 2005-01-25 | 2006-01-13 | Combination of high-side and low-side current sensing in a system powered over a communication link |
| CN2006800093423A Active CN101147355B (en) | 2005-01-25 | 2006-01-13 | Adjusting current limit thresholds based on power requirements of powered devices in a system supplying power over a communication link |
| CN200680003200.6A Active CN101116285B (en) | 2005-01-25 | 2006-01-13 | System, method and local area network for supplying power over a communication link |
| CNA2006800054715A Pending CN101124774A (en) | 2005-01-25 | 2006-01-19 | Power using delivery to power supply device between detection and classification mode |
| CNA2006800054700A Pending CN101124773A (en) | 2005-01-25 | 2006-01-19 | Providing data communication between power supply device and powered device in system for supplying power over communication link |
| CN2006800054698A Active CN101124772B (en) | 2005-01-25 | 2006-01-23 | System for providing power over communication cable having mechanism for determining resistance of communication cable |
| CN2006800031997A Expired - Fee Related CN101112043B (en) | 2005-01-25 | 2006-01-23 | System, method and LAN for controlling power distribution among multiple wires of communication cables |
| CNA2006800093438A Pending CN101147356A (en) | 2005-01-25 | 2006-01-24 | Supplying power over four pairs of conductors in communication cable |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800093495A Expired - Fee Related CN101147357B (en) | 2005-01-25 | 2006-01-09 | High power foldback mechanism in a system powered over a communication link |
Family Applications After (11)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800054630A Pending CN101124771A (en) | 2005-01-25 | 2006-01-09 | Power supply device with an auto-zero circuit for determining and controlling the output current |
| CN200680005472.XA Active CN101124775B (en) | 2005-01-25 | 2006-01-09 | Dual mode detection of powered devices in a power over ethernet system |
| CN2006800031925A Active CN101112042B (en) | 2005-01-25 | 2006-01-09 | System and method for distinguishing short circuit state of network interface card and power over ethernet system |
| CNA200680003193XA Pending CN101129019A (en) | 2005-01-25 | 2006-01-13 | Combination of high-side and low-side current sensing in a system powered over a communication link |
| CN2006800093423A Active CN101147355B (en) | 2005-01-25 | 2006-01-13 | Adjusting current limit thresholds based on power requirements of powered devices in a system supplying power over a communication link |
| CN200680003200.6A Active CN101116285B (en) | 2005-01-25 | 2006-01-13 | System, method and local area network for supplying power over a communication link |
| CNA2006800054715A Pending CN101124774A (en) | 2005-01-25 | 2006-01-19 | Power using delivery to power supply device between detection and classification mode |
| CNA2006800054700A Pending CN101124773A (en) | 2005-01-25 | 2006-01-19 | Providing data communication between power supply device and powered device in system for supplying power over communication link |
| CN2006800054698A Active CN101124772B (en) | 2005-01-25 | 2006-01-23 | System for providing power over communication cable having mechanism for determining resistance of communication cable |
| CN2006800031997A Expired - Fee Related CN101112043B (en) | 2005-01-25 | 2006-01-23 | System, method and LAN for controlling power distribution among multiple wires of communication cables |
| CNA2006800093438A Pending CN101147356A (en) | 2005-01-25 | 2006-01-24 | Supplying power over four pairs of conductors in communication cable |
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Also Published As
| Publication number | Publication date |
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| CN101124772B (en) | 2012-09-19 |
| CN101147355A (en) | 2008-03-19 |
| CN101147355B (en) | 2011-05-18 |
| CN101112043B (en) | 2010-10-13 |
| CN101124771A (en) | 2008-02-13 |
| CN101124775A (en) | 2008-02-13 |
| CN101124774A (en) | 2008-02-13 |
| CN101129019A (en) | 2008-02-20 |
| CN101112042B (en) | 2012-01-04 |
| CN101112042A (en) | 2008-01-23 |
| CN101124773A (en) | 2008-02-13 |
| CN101124772A (en) | 2008-02-13 |
| CN101156355A (en) | 2008-04-02 |
| CN101147357A (en) | 2008-03-19 |
| CN101116285B (en) | 2015-06-17 |
| CN101147357B (en) | 2010-10-13 |
| CN101112043A (en) | 2008-01-23 |
| CN101124775B (en) | 2014-11-26 |
| CN101116285A (en) | 2008-01-30 |
| CN101147356A (en) | 2008-03-19 |
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