CN207766027U - A kind of POE direct currents backup power supply system - Google Patents
A kind of POE direct currents backup power supply system Download PDFInfo
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- CN207766027U CN207766027U CN201721848044.5U CN201721848044U CN207766027U CN 207766027 U CN207766027 U CN 207766027U CN 201721848044 U CN201721848044 U CN 201721848044U CN 207766027 U CN207766027 U CN 207766027U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
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Abstract
The utility model proposes a kind of POE direct currents backup power supply systems, it is related to interchanger for electrical domain, including inverter and standby electric interconnecting module, standby electricity interconnecting module includes 220V alternating current line duration control modules, charger, battery, battery output control module, voltage reference module and voltage comparator, 220V alternating current line duration control module power ends are electrically connected with the cities 220V, the signal output end of 220V alternating current line duration control modules is connect with charger and battery output control module respectively, the signal output end of charger is connect with battery, the output end of battery is connect with battery output control module, the output end of battery output control module is connect with voltage reference module and voltage comparator respectively, the output end of voltage reference module is connect with voltage comparator；Inverter one end input terminal is connected with battery output control module, and the other end is connected with interchanger；The utility model solves the situation that interchanger breaks for lighting, it is ensured that the steady operation of wlan network.
Description
Technical field
The utility model is related to interchangers for electro-technical field, more particularly to a kind of POE direct currents backup power supply system.
Background technology
With the Rapid Expansion of wlan network overlay area, in overlay area, the quality of network quality, which becomes, improves user's sense
Degree of knowing and the key factor for promoting company service image.Only ensure that the normal work of various equipment in wlan network could be effectively
Guarantee network quality, the widely distributed each corner to city of WLAN site apparatus provides backup power supply system for every equipment and carries
High network quality, can substantially reduce network and move back and take index, win excellent network index.WLAN and AP, which is moved back, to be taken in reason, and 70%
It is line fault for safety at power cut, 15%, 9% is equipment fault, and 6% is other reasons.
Current WLAN site apparatus be successfully selected into it is a variety of it is standby be electrically accessed mode, more novel is direct current backup power supply system
Application.The more traditional standby electricity of this power supply mode is essentially different, and has following feature：1. small, pacified
Fill environmental restrictions very little；2. small power consumption, accumulator dosage is few；3. in-fighting is small, electricity consumption is far smaller than conventional standby electric equipment；4. making
Valence is low, is suitable for widely distributed；5. safeguard simple and have an intelligent monitoring, wireless annunciator state and electricity condition can be used.Direct current
Backup power supply system has been widely used for a variety of WLAN remote network devices environment, and take as communication remote equipment power source special
Notable achievement is obtained, but it is also necessary to take into account that its special supplied character, has corresponding in Huawei's series of switch practical application
Technological development.
The spare electric system of direct current is when accessing Huawei's AP interchangers, it is desirable to provide 12Vdc and all the way 48Vdc all the way, respectively
It powers for interchanger itself and AP, when city is electrically disconnected, standby cutting enters, and interchanger and AP are working properly, when main electric (alternating current) is extensive
After multiple, standby electricity exits, and interchanger is working properly, and exchange opportunity self-test POE power supplies, restarts AP.Originally it is normal work shape
State, but today of service profiles is continuously improved at us, promotion mostly will go to experience from customer perspective, if in the network operation
In, there is a flash, even short several seconds, also influence whether the perceptibility of user, therefore, it is urgent to provide a kind of new
Backup power supply system.
Utility model content
The utility model proposes a kind of POE direct currents backup power supply systems, solve the situation that interchanger breaks for lighting, it is ensured that WLAN nets
The steady operation of network greatly promotes user perceptibility in region.
What the technical solution of the utility model was realized in：
A kind of POE direct currents backup power supply system, including inverter and standby electric interconnecting module, the standby electric interconnecting module includes 220V
Alternating current line duration control module, charger, battery, battery output control module, voltage reference module and voltage comparator, institute
It states 220V alternating current line duration control module power ends to be electrically connected with the cities 220V, the signal of 220V alternating current line duration control modules
Output end is connect with charger and battery output control module respectively, and the signal output end of charger is connect with battery, battery
Output end is connect with battery output control module, the output end of battery output control module respectively with voltage reference module and voltage
Comparator connects, and the output end of voltage reference module is connect with voltage comparator；Described inverter one end input terminal and battery are defeated
Go out control module to be connected, the other end is connected with interchanger.
Further technical solution, the battery are lithium rechargeable batteries.
Further technical solution, the battery output control module include control single chip computer, charging control circuit,
DC48V output control circuits, warning circuit, 220V alternating current state acquisitions circuit, battery status Acquisition Circuit, the charge control
Circuit, DC48V output control circuits, warning circuit, 220V alternating current state acquisition circuits are connected with control single chip computer respectively；It is described
Battery status Acquisition Circuit is connected with battery；The 220V alternating currents state acquisition circuit is controlled with the 220V alternating currents line duration
Module connects, and the DC48V output control circuits are connect with inverter, and the charging control circuit is connect with the charger.
The model of further technical solution, the control single chip computer is STC12C5608AD.
The utility model has the beneficial effects that：The AP that the utility model can substantially reduce WALN websites moves back the rate of clothes, reduces
Customer complaint, energy saving, economic perfect Huawei's wlan network direct current spare the problem of being electrically accessed so that the standby electricity of direct current it is notable
Characteristic is played, and improves cooperation QuidWay switch work, it is ensured that the steady operation of wlan network is greatly improved in region and used
Family perceptibility.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is the systematic schematic diagram of the utility model；
Fig. 2 is Huawei AP interchanger structure schematic diagrams.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of POE direct currents backup power supply system, including inverter and standby electric interconnecting module, standby electricity interconnecting module packet
Include 220V alternating current line durations control module, charger, battery, battery output control module, voltage reference module and voltage ratio
Compared with device, 220V alternating current line duration control module power ends are electrically connected with the cities 220V, 220V alternating current line duration control modules
Signal output end is connect with charger and battery output control module respectively, and the signal output end of charger is connect with battery, electricity
The output end in pond is connect with battery output control module, the output end of battery output control module respectively with voltage reference module and
Voltage comparator connects, and the output end of voltage reference module is connect with voltage comparator；Inverter one end input terminal and battery are defeated
Go out control module to be connected, the other end is connected with interchanger.Battery is lithium rechargeable batteries.Battery output control module includes that control is single
Piece machine, charging control circuit, DC48V output control circuits, warning circuit, 220V alternating current state acquisitions circuit, battery status are adopted
Collector, charging control circuit, DC48V output control circuits, warning circuit, 220V alternating current state acquisitions circuit respectively with control
Microcontroller is connected；Battery status Acquisition Circuit is connected with battery；220V alternating current state acquisition circuits and the 220V alternating currents are online
Time control module connects, and DC48V output control circuits are connect with inverter, and charging control circuit is connect with the charger.
220V line duration control modules acquire battery status, if battery is less than, is controlled and are charged by charging control circuit
Device charges the battery, while DC48V output control circuits control inverter exports 48V, since inverter voltage is less than friendship
It changes planes main power source, is powered at this time by main power source, main power source is without output voltage if 220V is powered off, at this time by this equipment inverter
Power supply free of discontinuities is realized in power supply, while battery status Acquisition Circuit detects battery status, if always without 220V alternating currents and battery electricity
By the cut-out inversion output of DC48V output control circuits when pressing through low, while charging control circuit cut-out charging is to reduce battery work(
Consumption detects city's electricity condition by 220V alternating current state acquisition circuits, restores to charge to battery until 220V alternating currents are powered.Warning circuit
For switching signal, it to be used for warning message of the alternating current without 220V voltages, battery low-voltage.The model of control single chip computer is
STC12C5608AD。
As shown in Fig. 2, there are two power module storehouse, the first battery module storehouse 1 and the second battery modules for Huawei's AP interchangers
Storehouse 2, the second battery module storehouse 2 install normal power supplies module (Switching Power Supply), and it is power supply for exchange that exchange, which is converted to direct current,.
For POE direct currents backup power supply system in the first battery module storehouse 1 of interchanger, one end connects interchanger, and one end connects battery, two storehouses
Direct current output part it is conllinear, when the power module (Switching Power Supply) in the second battery module storehouse 2 does not work (AC dump),
The direct current backup power supply system seamless switching in the first battery module storehouse 1 gives power supply for exchange.When city power recovery, the second battery module
The power module (Switching Power Supply) in storehouse 2 works, and is power supply for exchange, and standby by the POE direct currents in the first battery module storehouse 1
Electric system is battery float.
Institute of electrical and electronic engineers IEEE has approved Power over Ethernet PoE (Power in June, 2003
OverEthernet) standard-IEEE 802.3af.The technology of this innovation of PoE refers to existing Ethernet CAT-5 wirings
Architecture is supplied by a conventional Ethernet cable while transmission data in the case of it goes without doing any change
Electric power, to ensure the cable while for AP transmission data signals, moreover it is possible to provide the ability of direct current supply for such equipment.
In fact, any required data connection and power over Ethernet all can be used in the equipment that can be worked at 13W or lower power.
Power supply and data are integrated in same wired system by PoE technologies, i.e., while ensuring that existing structureization wiring is safe, protect
The normal operation of existing network is demonstrate,proved.In PoE system, the equipment for providing power supply is referred to as power supply unit (PSE, Power
SourcingEquipment), it is known as power receiving equipment (PD, Powered Device) using the equipment of power supply.Power over Ethernet
Capital equipment be PSE, it is responsible for the detection of PD, is classified, powers on, the functions such as open circuit detection.Once when some PD is loaded,
PSE will be immediately detected the access of PD, and will cut off the power when equipment is removed.
POE work is divided into four steps, and first is detection, and allowing PSE, to before line powering, it must have with one
The test source of power is limited to check 25k featured resistances, to avoid 48V power supplys to be added to the network equipment of non-compatible PoE, it is made
At harm.Before power-up, PSE goes whether detecting has PD to access with the detecting voltage of 2.8V to 10V first, and when specific implementation is
2.8V to two voltages (being spaced in 1V or more) between 10V is sent to network link, then according to two obtained differences
Current value remake operation (Δ V/ Δ I), usually we the method is known as 2 detection methods.Second is classification, once detecting
To effective PD, PSE it should be understood that PD electricity consumption, the management in order to system to power supply, this process is known as PD classifications
(ieee standard provides that this process is optional).This stage, PSE was detected using the detecting voltage of a 15.5V to 20.5V
The power level of PD.Needed for PD shows oneself by absorbing a constant current (graded features signal) from line to PSE
Maximum power.PSE measures this electric current to determine which power level PD belongs to, and the PSE voltage sources used during classification are necessary
Be restricted to 100mA, to avoid damage failure PD, and its Connection Time no more than 75ms, to be controlled to PD power consumptions
System.Third is power supply, and with after classification, PSE's successful detection can power to PD.During power supply, PSE will also be to each port
Electric power thus supplied is monitored, under-voltage and overcurrent protection is provided.4th is open circuit protection, and PSE cannot transmit electric power to non-PD equipment,
Same PSE can not also make power supply in an ON state after PD is already off, because service cable is possible to that one can be inserted in
In non-PD equipment, or cause the short circuit of cable.Whether IEEE802.3af standards define two methods allows PSE detections PD to disconnect,
That is DC open circuits detection method and AC open circuit detection methods, different chip supplier select to be most suitable for system according to the actual conditions of system
Detection method.Wherein DC open circuits method is according to the DC current size for flowing to PD from PSE, to judge whether PD is online.Work as electricity
Stream keeps below threshold value IMIN (5mA to 10mA) in given time tDIS (300ms to 400ms), and PSE is considered as PD and does not deposit
To cut off the power.The shortcomings that this method, is exactly, and when PD is operated in low-power consumption mode, to avoid going offline, PD must week
Draw to phase property certain electric current.
According to POE supplied characters, in conjunction with QuidWay switch electricity consumption situation, we develop corresponding power supply for exchange power supply
Detection module, since exchanger power module interface is other than two-way direct current inputs, the also monitoring port of 16 needles, we
Stitch is done into energization one by one and is measured with carrying, it was therefore concluded that, the first pin is PSE communication clock pulses, and equipment is in communication clock
Under the action of pulse, communicated by given pace and time interval.Second pin is whether PSE monitors port on-line, if online
No power, host when red are powered and communicate normal green light.Third, the six, the tenth pins fit for group, and PSE is used for monitoring
Insert port is stand-by power supply or main electricity, so as to mainboard Query Information.5th pin is communication input/output interface, is transmitted and received
The required information of host, including device version and functional information, can determine whether power supply is compatible with.9th pin supplies for power supply
Electric end, this power supply is low-voltage power supply, to meet the power demands of mainboard and PSE communication modules.11st pin is communication mode
Select end, the communication direction between control control host and PSE.12nd, ten three-prongs are whether power module is powered monitoring
End, the second pin of host supervision is online if there is power supply, can judge whether to power by monitoring this foot, if be powered, and communicates
Normally, at this point, equipment enters normal operating conditions, illustrate hardware compatibility.
PSE is first begin to detect, and gives the detecting voltage of the ports PD 2.7V, identifies that PD is during detecting for the ease of PSE
Its input characteristics of performance (i.e. Δ V/ Δs I slopes 23.75k Ω ＜ RPD ＜ 26.25k Ω；0.05 μ F of input capacitance<CPD ＜
0.12μF；Input 100 μ H of inductance LPD ＜；Offset voltage ＜ 1.9V；10 μ A of drift current ＜) so that detection passes through.Then,
PSE at the ports PD with 20V detecting voltages when, PD can show the work(consumed required for oneself by absorbing certain constant current
Rate, so PSE is capable of the power consumption of budget PD and prepares to power.After the completion of detection and classification, PSE instruction powers port provides one
51Vdc voltages, and can detect, before port voltage is raised to 30Vdc, PD does not consume too big load current, to keep away
Exempt to interfere with each other with graded features signal；When voltage reaches 42Vdc, PD necessarily is in fully operational state.When working condition
PD port voltages should be 36 between 57Vdc.Meanwhile it being unable to continuous consumption 350mA electric currents or 12.95W power when PD work,
Allow the surge current for having 400mA in short-term.The input capacitance of PD has to be lower than 180 μ F, so as to when power supply is connected by surge
Electric current is maintained at rational level；If input capacitance big 180 μ F, PD will active limit inrush currents, so that it is less than
400mA.Finally, it is necessary to by maintaining PD power features MPS, send continue working signal.If without MPS, PSE can be cut off
Power supply prevents one from being accessed the ethernet device that cannot be powered by electrical cables.PD will at least keep the electric current of 10mA and exchange resistance
It is anti-to maintain 26.25k Ω or less in parallel with more than 0.05 μ F capacitances, it goes offline to avoid PD.
We integrate foregoing circuit part, chip microcontroller control are selected, by purchasing Da Suo companies of France
XSONG6506 customizes connector, and circuit output and signal output are fused on one piece of mainboard, then encapsulate mainboard, specification with
Original power module is completely the same.The two power module slots carried using interchanger, main electricity (alternating current) power module is on the right side
The standby electric interconnecting module of exploitation is inserted into stand-by power supply slot by side power slot position.12Vdc that spare electric system is provided and
48Vdc accesses interconnecting module, and to power supply for exchange, 48Vdc's 12Vdc is powered by PSE port to PD (AP), effective to ensure
Interchanger and AP are normally in net work after mains failure, and when primary electric (alternating current) restores normal, direct current automatically exits from for electricity, by
Main electricity power supply, completes the switch between alternating current and standby battery, and internal system switching time is less than 2ms.
We combine relevant knowledge for widely used Huawei WLAN interchangers in existing net at present and PD (AP) equipment into
Row further investigation and a large amount of complicated for electrical testing.Gradually understand and has grasped Huawei WLAN interchangers POE and AP in network operation
Power supply the principle and mechanism.Its power module controlled by internal PSE chip microcircuit voltages the detection of POE, classification, on
Electricity, short-circuit detecting and etc., the power supply management to each PD (AP) equipment of lower extension is completed by mid-span method Mid-Span.
After a large number of experiments test and data analysis, we develop mating interconnecting module, are finally completed to QuidWay switch PSE chips
Workflow, chip microcircuit detection it is compound with it is mating.It is tested by website analog subscriber on the spot, effect complies fully with pre-
Phase, to be truly realized the seamless switching of main power supply.
We have chosen 30 AP in certain communication common carrier and move back the higher WLAN websites of the rate of clothes at the beginning of 6 months 2016, are used in summer
Electric peak period carries out targetedly covering installation backup power supply.By the interconnecting module of this exploitation, DC standby power plays
Go out its advanced feature：It occupies little space, the standby electricity of time considerably longer than tradition is carried with a batteries, band, energy consumption is equivalent to conventional electricity
Source 10%, have an electricity consumption short message prompt, plan as a whole generating dutation, bring great convenience to maintenance work.This time exploitation turns
The cooperation of the further perfect direct current of connection module standby electricity and Huawei WLAN interchangers, when main electricity (alternating current) disconnects, standby cutting enters, and hands over
It changes planes working properly with AP, user terminal actual measurement is without phenomenon is disconnected, and when main electricity (alternating current) is restored, standby electricity exits, and interconnecting module will be adopted
PD (AP) job information collected smoothly consigns to interchanger PSE detection circuits so that the main electricity that interchanger will directly restore
PSE port is cut, AP is no longer restarted, and entire power process is not restarted or flash, and interchanger, AP are working properly, and user terminal is real
It surveys without disconnection phenomenon.The AP of WLAN websites moves back the rate of clothes in this overlay area, by 2% before installing, is reduced to 0.7%.AP is moved back
It takes rate and customer complaint is decreased obviously, energy saving, economic perfect Huawei's wlan network direct current spare the problem of being electrically accessed so that
The significant properties of the standby electricity of direct current is played, and cooperation QuidWay switch work is improved, it is ensured that the steady operation of wlan network, significantly
Improve user perceptibility in region.
POE technology use scopes are growing, and in 4.0 application of industry, communication linkage technology is able to extensive use, automatic control
The combination of equipment and telecommunication is closer, and end communication equipment is gradually mating or even merge with industrial automatic control equipment, and POE is straight
Flow the application of spare power technology, can the communication port electricity consumption of industrial automatic control ensured, be industrial equipment far control and Internet of Things
Network provides personalized, customization, the direct current supply of low power consuming and spare electric system.
The embodiment of the utility model is explained in detail above in association with attached drawing, but the utility model is not limited to be retouched
The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit
These embodiments carry out a variety of change, modification, replacement and modification, still fall in the scope of protection of the utility model.
Claims (4)
1. a kind of POE direct currents backup power supply system, which is characterized in that including inverter and standby electric interconnecting module, the standby electric switching model
Block includes 220V alternating current line durations control module, charger, battery, battery output control module, voltage reference module and electricity
Comparator, the 220V alternating currents line duration control module power end is pressed to be electrically connected with the cities 220V, 220V alternating current line duration controls
The signal output end of molding block is connect with charger and battery output control module respectively, the signal output end and battery of charger
Connection, the output end of battery connect with battery output control module, the output end of battery output control module respectively with voltage base
Quasi-mode block is connected with voltage comparator, and the output end of voltage reference module is connect with voltage comparator；Described inverter one end is defeated
Enter end with battery output control module to be connected, the other end is connected with interchanger.
2. a kind of POE direct currents backup power supply system according to claim 1, which is characterized in that the battery is lithium rechargeable batteries.
3. a kind of POE direct currents backup power supply system according to claim 1, which is characterized in that the battery output control module
Including control single chip computer, charging control circuit, DC48V output control circuits, warning circuit, 220V alternating current state acquisitions circuit,
Battery status Acquisition Circuit, the charging control circuit, DC48V output control circuits, warning circuit, 220V alternating current state acquisitions
Circuit is connected with control single chip computer respectively；The battery status Acquisition Circuit is connected with battery；The 220V alternating currents state acquisition
Circuit is connect with the 220V alternating currents line duration control module, and the DC48V output control circuits are connect with inverter, described
Charging control circuit is connect with the charger.
4. a kind of POE direct currents backup power supply system according to claim 3, which is characterized in that the model of the control single chip computer
It is STC12C5608AD.
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| CN201721848044.5U CN207766027U (en) | 2017-12-26 | 2017-12-26 | A kind of POE direct currents backup power supply system |
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| CN201721848044.5U CN207766027U (en) | 2017-12-26 | 2017-12-26 | A kind of POE direct currents backup power supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506332A (en) * | 2020-04-10 | 2020-08-07 | 宜鼎国际股份有限公司 | Data storage device capable of being remotely controlled and remote control system |
| CN114650189A (en) * | 2022-03-15 | 2022-06-21 | 永州市诺方舟电子科技有限公司 | Novel POE calibration test device and test method |
| CN114726807A (en) * | 2021-11-23 | 2022-07-08 | 苏州汇云鼎技术服务有限公司 | Industrial network data switch |
-
2017
- 2017-12-26 CN CN201721848044.5U patent/CN207766027U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111506332A (en) * | 2020-04-10 | 2020-08-07 | 宜鼎国际股份有限公司 | Data storage device capable of being remotely controlled and remote control system |
| CN111506332B (en) * | 2020-04-10 | 2023-12-08 | 宜鼎国际股份有限公司 | Remote-controlled data storage device and remote control system |
| CN114726807A (en) * | 2021-11-23 | 2022-07-08 | 苏州汇云鼎技术服务有限公司 | Industrial network data switch |
| CN114650189A (en) * | 2022-03-15 | 2022-06-21 | 永州市诺方舟电子科技有限公司 | Novel POE calibration test device and test method |
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