CN103873263B - A kind of method and device based on POE power supplies - Google Patents
A kind of method and device based on POE power supplies Download PDFInfo
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- CN103873263B CN103873263B CN201410119462.5A CN201410119462A CN103873263B CN 103873263 B CN103873263 B CN 103873263B CN 201410119462 A CN201410119462 A CN 201410119462A CN 103873263 B CN103873263 B CN 103873263B
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Abstract
The present invention provides a kind of method and device powered based on POE, the equipment applied to including Power over Ethernet POE units, and method includes：In the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs, the power receiving equipment that the either interface minimum to rank is connected stops power supply.The embodiment of the present invention is by providing a kind of method and device based on POE power supplies, to when rising the consumption power moment of the power receiving equipment of POE, it ensure that the normal work of the high power receiving equipment of significance level, the power receiving equipment delay machine that significance level will not be caused high because of the gross output deficiency of POE units.
Description
Technical field
The present invention relates to Power over Ethernet fields, more particularly to a kind of to be based on POE (Power Over Ethernet, ether
Net power supply) power supply method and device.
Background technology
POE can realize ethernet network power supply by 10base-T, 100BASE-TX, 1000BASE-T, reliable real
Showed centralized power power supply and it is easy to use, the network terminal is not required to external power supply, it is only necessary to which a cable can power.
The technology is widely used at present, can be that the terminal based on IP (Internet Protocol, the agreement interconnected between network) passes
While transmission of data signal, additionally it is possible to provide direct current supply for such equipment.Wherein, IP-based terminal can be IP phone
Machine, AP (Access Point, wireless local network connecting point), IPC (IP Camera, web camera) etc..
Currently, the gross output of POE units is limited in the equipment of support POE power supplies, however some POE power receiving equipments
Actual power consumption is unbalanced such as common holder type web camera, and the power and holder of consumption is actually needed in it
Rotation direction and rotation speed have relationship.For example, 8 mouthfuls of nest plate schemes with POE functions of industry routine, POE are mono-
First gross output is 64W, it is assumed that current 8 interfaces are all connected with equipment, the total consumed power of this 8 equipment when normal use
It is 62W, smaller than POE gross output, system is normal.In cloud platform rotation, consumption power moment reaches 14W, and (holder is quiet
It is 8W that power is only consumed under situation), it is more than POE gross outputs to lead to the total consumed power of POE power receiving equipments at this time, to lead
All POE power receiving equipments are caused all to can not work normally, delay machine problem occurs in system.
Invention content
In view of this, the present invention provides a kind of method and device powered based on POE, to solve to work as POE in the prior art
The consumption power moment of one power receiving equipment rises, and since the gross output of POE units is insufficient, leads to power receiving equipment delay machine
Problem.
An embodiment of the present invention provides a kind of methods based on POE power supplies, are applied to include Power over Ethernet POE units
Equipment, including：
It is minimum to rank in the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs
The power receiving equipment that is connected of either interface stop power supply.
Preferably, before the judgement POE units power currently to be exported is more than POE unit gross outputs, into
One step includes：
Receive the logon message that power receiving equipment is sent, the grade of the power receiving equipment entrained by the logon message
Not, the rank of the power receiving equipment connected interface is set to the rank of the power receiving equipment.
Preferably, the method further includes：
Receive the rank change request message that power receiving equipment is sent；
According to the rank change request message, the level modification of the power receiving equipment connected interface is set to be described by electricity
Standby current level.
Preferably, the equipment including Power over Ethernet POE units be network hard disk video recorder NVR equipment, it is described by
Electric equipment is the web camera IPC equipment by NVR equipment managements.
The embodiment of the present invention additionally provides a kind of device powered based on POE, is applied to include Power over Ethernet POE units
Equipment, including：
POE units, for the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs
Under, the power receiving equipment that the either interface minimum to rank is connected stops power supply.
Preferably, described device further comprises：
Setting unit, the logon message for receiving power receiving equipment transmission, according to entrained by the logon message
The rank of power receiving equipment sets the rank of the power receiving equipment connected interface to the rank of the power receiving equipment.
Preferably, the setting unit is further used for receiving the rank change request message that power receiving equipment is sent；
Described device further includes：Unit is changed, is used for according to the rank change request message, by the power receiving equipment phase
The level modification of connector is the current level of the power receiving equipment.
Preferably, the equipment including Power over Ethernet POE units be network hard disk video recorder NVR equipment, it is described by
Electric equipment is the web camera IPC equipment by NVR equipment managements.
The embodiment of the present invention is judging that POE units currently want defeated by providing a kind of method and device based on POE power supplies
In the case that the power gone out is more than POE unit gross outputs, the power receiving equipment that the either interface minimum to rank is connected stops
It only powers, to when rising the consumption power moment of the power receiving equipment of POE, ensure that the high power receiving equipment of significance level just
Often work, the power receiving equipment delay machine that significance level will not be caused high because of the gross output deficiency of POE units.
Description of the drawings
Fig. 1 is method flow diagram provided in an embodiment of the present invention；
Fig. 2 is the structural relation schematic diagram of power receiving equipment provided in an embodiment of the present invention, POE units and power supply unit；
Fig. 3 is apparatus structure schematic diagram provided in an embodiment of the present invention.
Specific implementation mode
According in the prior art, 8 mouthfuls of nest plate schemes with POE functions of industry routine, POE unit gross outputs are
64W, it is assumed that current 8 interfaces are all connected with equipment, and the total consumed power of this 8 equipment is 62W when normal use, more total than POE
Output power is small, and system is normal.In cloud platform rotation, consumption power moment reaches 14W, and (holder consumes work(under stationary condition
Rate is 8W), it is more than POE gross outputs to lead to the total consumed power of POE power receiving equipments at this time, so as to cause all POE by
Electric equipment all can not work normally, and delay machine problem occurs in system.
In view of the above-mentioned problems, an embodiment of the present invention provides a kind of method based on POE power supplies, it is applied to include Ethernet
The equipment of power supply POE units, the core concept of this method are：From the power supply unit sound where the power receiving equipment of POE to POE units
The bright significance level of itself, the rank that the power supply unit where POE units is fed back according to power receiving equipment, adjustment POE units power supply
Priority ensures the normal work of the high power receiving equipment of significance level, and this method may include the following contents：
It is minimum to rank in the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs
The power receiving equipment that is connected of either interface stop power supply.
The above method provided in an embodiment of the present invention is judging that the power that POE units currently to be exported is more than that POE units are total
In the case of output power, the power receiving equipment that the either interface minimum to rank is connected stops power supply, to when POE is by electricity
When the consumption power moment of equipment rises, the normal work of the high power receiving equipment of significance level ensure that, it will not be because of POE units
Gross output is insufficient and the power receiving equipment delay machine that causes significance level high.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, for a kind of method flow diagram based on POE power supplies provided in an embodiment of the present invention, this method can be with
Include the following steps：
Step 101：The logon message that power receiving equipment is sent is received, is set by electricity according to described in entrained by the logon message
Standby rank sets the rank of the power receiving equipment connected interface to the rank of the power receiving equipment；
In embodiments of the present invention, power receiving equipment can with the technology of the power supply unit progress Signalling exchange where POE units
It, can be with to be opening Internet video Interface Forum (Open Network Video Interface Forum, ONVIF) technology
By increasing field in ONVIF agreements, to state the rank of power receiving equipment.According to the increased field in ONVIF agreements, when
Power receiving equipment on the power supply unit where POE units when being registered, the power supply unit hair where power receiving equipment to POE units
Access (Simple Object Access Protocol, SOAP) message, the logon message is sent to carry the rank of corresponding power receiving equipment.
Wherein, which is the characteristic that power receiving equipment is utilized and must be registered to power supply unit.When on power receiving equipment
When electric, registered immediately to power supply unit, when sending logon message to power supply unit, by the class information of power receiving equipment and
When feed back to power supply unit.To ensure that power supply unit knows the promptness of power receiving equipment class information.
Wherein, the power supply unit where the POE units can be network hard disk video recorder (Network Video
Recorder, NVR), can also be other power supply units that can support POE units.Power receiving equipment can be IP telephone machine, AP
(Access Point, wireless local network connecting point), IPC (IP Camera, web camera) etc..
Wherein, for the rank of power receiving equipment by Administrator, the rank of power receiving equipment may include multiple grades, for example,
Crucial (crucial), important (Important), general (normal), inessential (Unimportant).For it is high level by
Electric equipment, POE units need to ensure the power supply to it.If administrator is not configured the rank of power receiving equipment, should be set by electricity
Default value may be used in standby rank, and default value can be that " general n ormal " can also be " inessential Unimportant ", should
Default level can be arranged according to specific requirements, and it is not limited in the embodiment of the present invention.
Below for power receiving equipment is arranged and is " crucial crucial ", then increased field can be in ONVIF agreements
Following code：
In embodiments of the present invention, when the logon message for receiving power receiving equipment transmission, record receives the logon message
Interface serial numbers, and the rank of the power receiving equipment entrained by the logon message is read, so as to complete power supply unit institute
Power supply unit interface serial numbers and power receiving equipment rank correspondence.Wherein, power receiving equipment may include multiple confessions
The number of electrical interface, power supply interface determines that the embodiment of the present invention is not especially limited this with specific reference to the model of power receiving equipment.
The correspondence of interface serial numbers and power receiving equipment rank as shown in table 1 below for power supply unit, the embodiment of the present invention is with by electricity
Equipment includes for power supply unit where the rank of 4 grades, POE units includes 4 power supply interfaces.And as shown in Fig. 2,
For the structural relation schematic diagram of power receiving equipment, POE units and power supply unit.
Table 1：
| Power receiving equipment rank | Power supply unit interface |
| Critical | Eth1 |
| Important | Eth2 |
| Normal | Eth3 |
| Unimportant | Eth4 |
Wherein, the rank for the power receiving equipment that the power supply unit where POE units is carried according to logon message, will be described by electricity
The rank of equipment connected interface is set as the rank of the power receiving equipment.
For example, according to pair of the interface serial numbers of the power supply unit where the power supply unit in table 1 and power receiving equipment rank
It should be related to, set the POE power supplies priority for the corresponding interface Eth1 that power receiving equipment rank is " Critical " to highest；It will be by
The POE power supplies priority that electric equipment rank is the corresponding interface Eth2 of " Important " is set as high；It is by power receiving equipment rank
During the POE power supplies priority of the corresponding interface Eth3 of " Normal " is set as；It is " Unimportant " by power receiving equipment rank
The POE power supplies priority of corresponding interface Eth4 is set as low.Wherein, the pass of the interface serial numbers of power supply unit and power supply priority
System is as shown in table 2.
Table 2：
| Power receiving equipment rank | Power supply unit interface | Power supply priority |
| Critical | Eth1 | Highest |
| Important | Eth2 | It is high |
| Normal | Eth3 | In |
| Unimportant | Eth4 | It is low |
The setting of the interface power supply priority of power supply unit where POE units in table 2, priority is higher, more enjoys
There is the permission preferentially powered.
In embodiments of the present invention, if administrator is modified the rank of power receiving equipment on web page, by electricity
The other change request message of power supply unit gradation where from equipment to POE units, the power supply unit where POE units is according to the rank
Change request message, by the current level that the level modification of the power receiving equipment connected interface is the power receiving equipment.
Step 102：It is right in the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs
The power receiving equipment that the minimum either interface of rank is connected stops power supply.
In embodiments of the present invention, when the power of certain power receiving equipment accessed on the power supply unit where POE units
Demand increases suddenly, and the POE units power currently to be exported for being likely to result in power supply unit is more than the total output work of POE units
Rate, it is therefore desirable to power receiving equipment that the either interface minimum to rank is connected stops power supply, with ensure to rank it is higher by
Electric equipment is powered.It thereby may be ensured that the normal operation of the higher power receiving equipment of significance level, without interruption.
In embodiments of the present invention, judging that the power that POE units currently to be exported is less than POE unit gross outputs
In the case of, then the power for directly meeting the power receiving equipment that transmission power increases message increases；Judging that POE units currently want defeated
In the case that the power gone out is more than POE unit gross outputs, the processing of power supply unit can specifically include the following aspects：
(1) if power supply unit includes a minimum interface of rank, the interface minimum to the rank connected by electricity
Equipment stops power supply.Wherein, the power receiving equipment for stopping power supply can also be the equipment for needing to increase power.
(2) if power supply unit includes the minimum interface of multiple ranks, the either interface minimum to rank connected by
Electric equipment stops power supply.Wherein, the equipment for needing to increase power can also be made by stopping the power receiving equipment of power supply.
(3) if the rank of the total interface of current power supply unit such as is all highest all, when judging that POE is mono- at this time
First power currently to be exported is more than POE unit gross outputs, then such situation belongs to administrator policy allocation problem.
In embodiments of the present invention, if the power receiving equipment that the either interface minimum to rank is connected stops after powering,
In the case of further judging that power that POE units currently to be exported is more than POE unit gross outputs, continue to currently powering
, the power receiving equipment that the either interface that rank is minimum is connected stop power supply, the power currently to be exported until judging POE units
Until POE unit gross outputs.
The method provided according to embodiments of the present invention is judging that the power that POE units currently to be exported is more than that POE units are total
In the case of output power, the power receiving equipment that the either interface minimum to rank is connected stops power supply, to when POE is by electricity
When the consumption power moment of equipment rises, the normal work of the high power receiving equipment of significance level ensure that, it will not be because of POE units
Gross output is insufficient and the power receiving equipment delay machine that causes significance level high.
As shown in figure 3, for a kind of apparatus structure schematic diagram based on POE power supplies provided in an embodiment of the present invention, the device
Equipment applied to Power over Ethernet POE units are included, the device may include with lower unit：
Setting unit 301, the logon message for receiving power receiving equipment transmission, the institute entrained by the logon message
The rank for stating power receiving equipment sets the rank of the power receiving equipment connected interface to the rank of the power receiving equipment.
In embodiments of the present invention, power receiving equipment can with the technology of the power supply unit progress Signalling exchange where POE units
It, can be with to be opening Internet video Interface Forum (Open Network Video Interface Forum, ONVIF) technology
By increasing field in ONVIF agreements, to state the rank of power receiving equipment.According to the increased field in ONVIF agreements, when
Power receiving equipment on the power supply unit where POE units when being registered, the power supply unit hair where power receiving equipment to POE units
Access (Simple Object Access Protocol, SOAP) message, the logon message is sent to carry the rank of corresponding power receiving equipment.
Wherein, which is the characteristic that power receiving equipment is utilized and must be registered to power supply unit.When on power receiving equipment
When electric, registered immediately to power supply unit, when sending logon message to power supply unit, by the class information of power receiving equipment and
When feed back to power supply unit.To ensure that power supply unit knows the promptness of power receiving equipment class information.
Wherein, the power supply unit where the POE units can be network hard disk video recorder (Network Video
Recorder, NVR), can also be other power supply units that can support POE units.Power receiving equipment can be IP telephone machine, AP
(Access Point, wireless local network connecting point), IPC (IP Camera, web camera) etc..
Wherein, for the rank of power receiving equipment by Administrator, the rank of power receiving equipment may include multiple grades, for example,
Crucial (crucial), important (Important), general (normal), inessential (Unimportant).For it is high level by
Electric equipment, POE units need to ensure the power supply to it.If administrator is not configured the rank of power receiving equipment, should be set by electricity
Default value may be used in standby rank, and default value can be that " general n ormal " can also be " inessential Unimportant ", should
Default level can be arranged according to specific requirements, and it is not limited in the embodiment of the present invention.
In embodiments of the present invention, when the logon message for receiving power receiving equipment transmission, record receives the logon message
Interface serial numbers, and the rank of the power receiving equipment entrained by the logon message is read, so as to complete power supply unit institute
Power supply unit interface serial numbers and power receiving equipment rank correspondence.Wherein, power receiving equipment may include multiple confessions
The number of electrical interface, power supply interface determines that the embodiment of the present invention is not especially limited this with specific reference to the model of power receiving equipment.
The correspondence of interface serial numbers and power receiving equipment rank as shown in table 1 below for power supply unit, the embodiment of the present invention is with by electricity
Equipment includes for power supply unit where the rank of 4 grades, POE units includes 4 power supply interfaces.And as shown in Fig. 2,
For the structural relation schematic diagram of power receiving equipment, POE units and power supply unit.
Wherein, the rank for the power receiving equipment that the power supply unit where POE units is carried according to logon message, will be described by electricity
The rank of equipment connected interface is set as the rank of the power receiving equipment.
For example, according to pair of the interface serial numbers of the power supply unit where the power supply unit in table 1 and power receiving equipment rank
It should be related to, set the POE power supplies priority for the corresponding interface Eth1 that power receiving equipment rank is " Critical " to highest；It will be by
The POE power supplies priority that electric equipment rank is the corresponding interface Eth2 of " Important " is set as high；It is by power receiving equipment rank
During the POE power supplies priority of the corresponding interface Eth3 of " Normal " is set as；It is " Unimportant " by power receiving equipment rank
The POE power supplies priority of corresponding interface Eth4 is set as low.Wherein, the pass of the interface serial numbers of power supply unit and power supply priority
System is as shown in table 2.
The setting of the interface power supply priority of power supply unit where POE units in table 2, priority is higher, more enjoys
There is the permission preferentially powered.
In embodiments of the present invention, if administrator is modified the rank of power receiving equipment on web page, by electricity
The other change request message of power supply unit gradation where from equipment to POE units, the power supply unit where POE units is according to the rank
Change request message, by the current level that the level modification of the power receiving equipment connected interface is the power receiving equipment.Setting is single
Member 301 is further used for receiving the rank change request message that power receiving equipment is sent.Described device further includes modification unit, is used for
It is the current of the power receiving equipment by the level modification of the power receiving equipment connected interface according to the rank change request message
Rank.
POE units 302, for judging that power that POE units currently to be exported is more than the feelings of POE unit gross outputs
Under condition, the power receiving equipment that the either interface minimum to rank is connected stops power supply.
In embodiments of the present invention, when the power of certain power receiving equipment accessed on the power supply unit where POE units
Demand increases suddenly, and the POE units power currently to be exported for being likely to result in power supply unit is more than the total output work of POE units
Rate, it is therefore desirable to power receiving equipment that the either interface minimum to rank is connected stops power supply, with ensure to rank it is higher by
Electric equipment is powered.It thereby may be ensured that the normal operation of the higher power receiving equipment of significance level, without interruption.
In embodiments of the present invention, judging that the power that POE units currently to be exported is less than POE unit gross outputs
In the case of, then the power for directly meeting the power receiving equipment that transmission power increases message increases；Judging that POE units currently want defeated
In the case that the power gone out is less than POE unit gross outputs, the processing of power supply unit can specifically include following side
Face：
(1) if power supply unit includes a minimum interface of rank, the interface minimum to the rank connected by electricity
Equipment stops power supply.Wherein, the power receiving equipment for stopping power supply can also be the equipment for needing to increase power.
(2) if power supply unit includes the minimum interface of multiple ranks, the either interface minimum to rank connected by
Electric equipment stops power supply.Wherein, the equipment for needing to increase power can also be made by stopping the power receiving equipment of power supply.
(3) if the rank of the total interface of current power supply unit such as is all highest all, when judging that POE is mono- at this time
First power currently to be exported is more than POE unit gross outputs, then such situation belongs to administrator policy allocation problem.
In embodiments of the present invention, if the power receiving equipment that the either interface minimum to rank is connected stops after powering,
In the case of further judging that power that POE units currently to be exported is more than POE unit gross outputs, continue to currently powering
, the power receiving equipment that the either interface that rank is minimum is connected stop power supply, the power currently to be exported until judging POE units
Until POE unit gross outputs.
The device provided according to embodiments of the present invention is judging that the power that POE units currently to be exported is more than that POE units are total
In the case of output power, the power receiving equipment that the either interface minimum to rank is connected stops power supply, to when POE is by electricity
When the consumption power moment of equipment rises, the normal work of the high power receiving equipment of significance level ensure that, it will not be because of POE units
Gross output is insufficient and the power receiving equipment delay machine that causes significance level high.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (4)
1. a kind of method based on POE power supplies, the equipment applied to including Power over Ethernet POE units, which is characterized in that packet
It includes：
The logon message that power receiving equipment is sent is received, the rank of the power receiving equipment entrained by the logon message will
The rank of the power receiving equipment connected interface is set as the rank of the power receiving equipment；
In the case where the power for judging that POE units currently to be exported is more than POE unit gross outputs, according to it is set by
The rank of electric equipment, the power receiving equipment that the either interface minimum to rank is connected stop power supply；
Wherein, the equipment including Power over Ethernet POE units is network hard disk video recorder NVR equipment, the power receiving equipment
For by the web camera IPC equipment of NVR equipment managements.
2. the method as described in claim 1, which is characterized in that the method further includes：
Receive the rank change request message that power receiving equipment is sent；
It is the power receiving equipment by the level modification of the power receiving equipment connected interface according to the rank change request message
Current level.
3. a kind of device based on POE power supplies, the equipment applied to including Power over Ethernet POE units, which is characterized in that packet
It includes：
Setting unit, the logon message for receiving power receiving equipment transmission, according to described in entrained by the logon message by electricity
The rank of equipment sets the rank of the power receiving equipment connected interface to the rank of the power receiving equipment；
POE units, in the case of for being more than POE unit gross outputs in the power for judging that POE units currently to be exported, root
According to the rank of set power receiving equipment, the power receiving equipment that the either interface minimum to rank is connected stops power supply；
Wherein, the equipment including Power over Ethernet POE units is network hard disk video recorder NVR equipment, the power receiving equipment
For by the web camera IPC equipment of NVR equipment managements.
4. device as claimed in claim 3, which is characterized in that the setting unit is further used for receiving power receiving equipment hair
The rank change request message sent；
Described device further includes：Unit is changed, for according to the rank change request message, the power receiving equipment to be connected
The level modification of mouth is the current level of the power receiving equipment.
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| CN201410119462.5A CN103873263B (en) | 2014-03-27 | 2014-03-27 | A kind of method and device based on POE power supplies |
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| CN201410119462.5A CN103873263B (en) | 2014-03-27 | 2014-03-27 | A kind of method and device based on POE power supplies |
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| CN105610587B (en) * | 2016-03-17 | 2019-06-11 | 浙江宇视科技有限公司 | A kind of method of supplying power to and device |
| CN109660365A (en) * | 2019-02-26 | 2019-04-19 | 新华三技术有限公司 | A kind of method for controlling power supply and device |
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| US7417443B2 (en) * | 2007-01-07 | 2008-08-26 | Microsemi Corp. - Analog Mixed Signal Group, Ltd. | Determination of effective resistance between a power sourcing equipment and a powered device |
| US8028176B2 (en) * | 2007-04-18 | 2011-09-27 | Broadcom Corporation | System and method for modeling a power over ethernet component in a computing device platform using a common information model |
| CN101707380B (en) * | 2008-07-21 | 2012-05-30 | 北京星网锐捷网络技术有限公司 | Method, device and system for configuring power supply system |
| CN101820348A (en) * | 2010-03-09 | 2010-09-01 | 武汉烽火网络有限责任公司 | Method and device for carrying out overload protection on equipment in POE system |
| CN101902341B (en) * | 2010-07-19 | 2014-07-16 | 中兴通讯股份有限公司 | Method and device for supplying power for powered device |
| CN102025509B (en) * | 2010-11-10 | 2014-07-16 | 中兴通讯股份有限公司 | Power-off control method and device |
| CN103138946B (en) * | 2011-12-05 | 2017-05-31 | 佛山市顺德区格雷特电源有限公司 | A kind of POE power supply management methods and device |
| CN103384200A (en) * | 2012-11-23 | 2013-11-06 | 上海斐讯数据通信技术有限公司 | Ethernet power supply device and method for distributing power supply power |
| CN103200015A (en) * | 2013-04-03 | 2013-07-10 | 武汉烽火网络有限责任公司 | Power over Ethernet (POE) switchboard power supply method |
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| CN101060412A (en) * | 2007-03-29 | 2007-10-24 | 杭州华三通信技术有限公司 | Ethernet power supply system, control unit, master control module and Ethernet power supply method |
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