CN101404582B - Management signal transmitting/receiving method and apparatus, Ethernet power supply unit and system - Google Patents
Management signal transmitting/receiving method and apparatus, Ethernet power supply unit and system Download PDFInfo
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Abstract
The invention provides a method for sending and receiving a management signal, a device thereof, an Ethernet power supply unit and a system thereof; wherein, the sending method comprises the following steps: a sending end device injects the management signal to a centre tap of an isolating transformer device positioned at a sending end; the injected management signal is superimposed on a twisted pair wire to form a common mode management signal; and the common mode management signal is transmitted to a receiving end device by the twisted pair wire. The receiving method comprises the following steps: a receiving end device receives the common mode management signal from the twisted pair wire; and the common mode management signal is extracted by the central tap of the isolating transformer device positioned at the receiving end to form the management signal. By the invention, the management signal can be mutually transmitted between the sending end device and the receiving end device; moreover, the management signal is not needed to be inserted into a service, thus causing no influence to the throughput rate of effective data and optimizing the transmission efficiency.
Description
Technical field
The present invention relates to a kind of sending, receiving method of supervisory signal, sending, receiving method, isolated transformer device and the Power over Ethernet equipment and the system of the supervisory signal of striding equipment belong to the Power over Ethernet technical field in relating in particular to.
Background technology
Power over Ethernet (Power over Ethernet, be called for short: PoE) technology is that purpose is in order to reduce the wiring complexity and the cost of communication equipment by the technology of a kind of use twisted-pair feeder (Twisted-Pair Cable) electric energy transmitting of IEEE 802.3af standard definition.The PoE system generally include feeder ear (Power Source End, be called for short: PSE) and power receiving equipment (Powered Device, abbreviation: PD), the former is used to provide electric energy, and this electric energy of The latter carries out work.
For the switch that possesses the PoE function, this switch can be used as PSE and directly powers to PD by twisted-pair feeder.But common switch does not have the PoE ability, and in order to utilize the PoE function, prior art has been introduced middle striding equipment (Midspan PSE) in the PoE system.Middle striding equipment is used for external power supply is injected into twisted-pair feeder, thereby makes PD normally receive electric energy work between switch that does not possess the PoE function and PD.
As shown in Figure 1, expression has the structural representation of the PoE system of middle striding equipment.Wherein, the switch of no PoE function is to middle striding equipment transmission signals A, because this switch does not possess the PoE function, so this signal A electric energy that will not transmit.Middle striding equipment injects from external power source and obtains electric energy adding signal A formation signal B, again this signal B is transferred to PD, makes PD can also obtain electric energy to support its operate as normal in picked up signal.
Yet existing common middle striding equipment does not generally possess management function, is foolproof equipment.Therefore, be not easy to the centering striding equipment and carry out failure diagnosis, power supply output that also can't the centering striding equipment is controlled, and does not also meet energy-conservation trend.Also have the middle striding equipment of some top grades in addition, possess separate processor and operating system, independently management function can be provided, but the raising that also therefore brings cost and complexity.
For the centering striding equipment manages, some methods of utilizing switch centering striding equipment to manage have been proposed in the prior art.Striding equipment and distribute the method for electric energy and comprise the communication system of striding equipment in this in a kind of Power over Ethernet that is proposed in the patent application of (open source literature number be CN101043341) that application number is 200710089666.9.Main technical scheme is to insert management flow by switch in the service signal of higher speed; In the processor of striding equipment from network signal, discern supervisory signal and handle, and with service signal do not add modification to the next stage transmission.Utilize this supervisory signal just can realize the management of centering striding equipment.
Adopt the defective of method described in the above-mentioned patent application to be: in order from numerous complicated service signals, to isolate supervisory signal, just need be in middle striding equipment device such as signalization decoding device and processor, compare with the middle striding equipment that possesses the function managed independently, this way does not reduce complexity and cost, and, in service signal, insert the throughput that supervisory signal has also reduced valid data to a certain extent.
Summary of the invention
The purpose that the present invention wants is: sending, receiving method, equipment and Power over Ethernet system that a kind of supervisory signal is provided, to realize the management of switch centering striding equipment, use same twisted-pair feeder transmitting business signal and supervisory signal, do not influence the throughput of service signal and can significantly reduce in the complexity and the cost of striding equipment.
To achieve these goals, one embodiment of the present of invention provide a kind of sending method of supervisory signal, be used for the Power over Ethernet system, comprise: sending ending equipment is coupled to the difference mode signal pin of the isolated transformer device of service signal by being positioned at transmitting terminal on the twisted-pair feeder, form the differential mode service signal, the absolute value of two potential values in the described differential mode service signal is identical, and polarity is opposite; Wherein this method also comprises:
Described sending ending equipment is injected into supervisory signal on the central tap of the described isolated transformer device that is positioned at transmitting terminal;
The supervisory signal that injects is added to forms the common mode supervisory signal on the twisted-pair feeder, and the absolute value of two potential values in the described common mode supervisory signal is identical, and polarity is identical;
By described twisted-pair feeder, described common mode supervisory signal and described differential mode service signal are transferred to receiving device jointly.
To achieve these goals, an alternative embodiment of the invention provides a kind of method of reseptance of supervisory signal, is used for the Power over Ethernet system, comprising:
Receiving device receives common mode supervisory signal and differential mode service signal from twisted-pair feeder;
The central tap of the isolated transformer device by being positioned at receiving terminal extracts described common mode supervisory signal and forms supervisory signal.
To achieve these goals, another embodiment of the present invention provides a kind of isolated transformer device, be used for the Power over Ethernet system, be connected with twisted-pair feeder, comprising: central tap, the supervisory signal that is used for injecting is added to and forms the common mode supervisory signal on the described twisted-pair feeder, and is used for the differential mode service signal that receives from described twisted-pair feeder and common mode supervisory signal and extracts described common mode supervisory signal and form supervisory signal.
To achieve these goals, another embodiment of the present invention provides a kind of Power over Ethernet equipment that comprises above-mentioned isolated transformer device, wherein also comprise: control unit, be used to produce the central tap that control signal is injected into described isolated transformer device, and be used to receive the supervisory signal of exporting from described central tap.This Power over Ethernet equipment can be switch or middle striding equipment.
To achieve these goals, another embodiment of the present invention provides a kind of Power over Ethernet system that comprises above-mentioned Power over Ethernet equipment, wherein:
Described Power over Ethernet equipment is switch, and described control unit is a processor; Perhaps,
Described Power over Ethernet equipment is middle striding equipment, and described control unit is the Power over Ethernet control device;
Described switch is connected by twisted-pair feeder with described middle striding equipment.
By the present invention, transfer management signal mutually between sending ending equipment and the receiving device; And, need not supervisory signal is inserted in the business, thereby can the throughput of valid data not impacted, optimized efficiency of transmission.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of Power over Ethernet of the prior art system;
Fig. 2 is the sending method of the inventive method embodiment one described supervisory signal and the flow chart of method of reseptance;
Fig. 3 is the sending method of the inventive method embodiment two described supervisory signals and the flow chart of method of reseptance;
Fig. 4 is the sending method of the inventive method embodiment three described supervisory signals and the flow chart of method of reseptance;
Fig. 5 is the structural representation of the described Power over Ethernet of present device system embodiment system.
Embodiment
Method embodiment one
Present embodiment provides a kind of sending method and method of reseptance of supervisory signal, comprises step as shown in Figure 2.Wherein, the sending method of step 101～104 expression supervisory signals; The method of reseptance of step 111～114 expression supervisory signals.
Particularly, the supervisory signal of control unit that comes from sending ending equipment can be re-introduced on the central tap of the isolated transformer device that is positioned at transmitting terminal after by the transmitting terminal spacer assembly.
This is because above-mentioned control unit as the Power over Ethernet control device in processor in the switch or the middle striding equipment, can adopt special interface to receive and dispatch supervisory signal as management channels usually.These special interfaces can be IIC standard interface, RS485 standard interface or RS232 standard interface etc.Because sending ending equipment and receiving device, for example adopt different electric power systems between switch and the middle striding equipment usually, therefore may have different earth potentials, earthy inconsistent interface that just might cause damages, adopt switch end spacer assembly effectively to isolate potential difference, play the effect that prevents that interface from damaging.
The difference mode signal pin of step 112, the receiving device isolated transformer device by being positioned at receiving terminal extracts described differential mode service signal and forms service signal.
Wherein, the differential mode service signal is to represent by the potential difference of two transmission lines of twisted-pair feeder, therefore can recover original service signal by asking modes such as potential difference.At this moment, the common mode supervisory signal is arranged,, can be cancelled, therefore can not influence the recovery of service signal by asking potential difference because the current potential of common mode supervisory signal on two transmission lines of twisted-pair feeder is identical although on twisted-pair feeder, also transmit.
The central tap of step 113, the receiving device isolated transformer device by being positioned at receiving terminal extracts described common mode supervisory signal and forms supervisory signal.
Wherein, " differential mode " in the present embodiment is meant by the potential difference between two transmission lines of twisted-pair feeder and represents the signal that transmitted; " common mode " is meant by all transmit identical current potential on two transmission lines of twisted-pair feeder and represents the signal that transmitted.Existing Ethernet is used and is only utilized the differential mode transmission means to come transmitting business signal to be because differential mode transmission means noise resistance performance is good, is suitable for the transmission of high speed, long distance; Common mode transmission mode noise resistance performance a little less than, can only carry out low speed, short-range transmission.But in the present embodiment, owing to be carried out the equipment of control, as middle striding equipment etc., usually do not need processor and complex decoding equipment, the data volume of the supervisory signal that the centering striding equipment is controlled is few, structure is also uncomplicated, therefore only just can satisfy the needs of control and management by the common mode transmission mode transfer management signal that adopts low speed, simple protocol.
By isolated transformer device the common mode supervisory signal and the differential mode service signal that are transmitted in simultaneously on the twisted-pair feeder are not disturbed mutually, can independently discern at receiving terminal.Below illustrate:
Suppose the current potential of differential mode service signal on two transmission lines of twisted-pair feeder be respectively+5v and-5v; The current potential of common mode supervisory signal on two transmission lines of twisted-pair feeder be respectively+4v and+4v.After being added on the twisted-pair feeder, the current potential on two transmission lines is respectively+9v and-1v.At receiving terminal, by the current potential on two transmission lines of twisted-pair feeder is asked poor, obtain service signal for+9v-(1v)=10v; By the current potential on two transmission lines of twisted-pair feeder is asked arithmetic mean obtain supervisory signal for (+9v-1v)/2=+4v.This result of calculation matches with preceding above-mentioned differential mode service signal and the condominium reason signal that superposes, thereby has realized that the two does not disturb mutually to the isolation of this two classes signal.
Need to prove herein, do not limit the order of carrying out between the step of above-mentioned formation and extraction differential mode service signal and common mode supervisory signal, form or extraction common mode supervisory signal after promptly forming or extract the differential mode service signal earlier, form or extraction differential mode service signal after perhaps forming or extract the common mode supervisory signal earlier, perhaps the two forms simultaneously all and can suitably select according to actual needs.
By the described method of present embodiment, transfer management signal mutually between sending ending equipment and the receiving device; And, need not supervisory signal is inserted in the business, thereby can the throughput of valid data not impacted, optimized efficiency of transmission; In addition, controlled equipment, as middle striding equipment, do not need complex decoding equipment and special-purpose processor, the PoE control chip that only need possess the simple management function gets final product, such chip can possess as one or more communication interfaces in IIC standard, RS485 standard, the RS232 standard, therefore implement simple and improvement cost low.
Method embodiment two
Present embodiment is switch with the sending ending equipment, and receiving device is that middle striding equipment is an example, and a kind of sending method and method of reseptance of supervisory signal is provided, and as shown in Figure 3, comprises the steps:
The supervisory signal that step 202, switch will come from the processor of switch is injected on the central tap of the isolated transformer device that is positioned at the switch end.
Wherein, the supervisory signal in the present embodiment is used for the centering striding equipment to be controlled, and for example striding equipment begins to power or stop power supply in the indication, and indicates concrete supply power voltage etc.
The difference mode signal pin of step 212, the middle striding equipment isolated transformer device by being arranged in the striding equipment end extracts described differential mode service signal and forms service signal.
The central tap of step 213, the middle striding equipment isolated transformer device by being arranged in the striding equipment end extracts described common mode supervisory signal and forms supervisory signal.
The Power over Ethernet control device receives this supervisory signal, according to this supervisory signal striding equipment in this is implemented control.
By the described method of present embodiment, realized implementing control and management by switch centering striding equipment, need not supervisory signal is inserted in the business, thereby can the throughput of valid data not impacted, optimized efficiency of transmission; In addition, receiving device need not to increase extra processor and complex decoding device, therefore implement simple and improvement cost low.
Method embodiment three
Present embodiment is middle striding equipment with sending ending equipment, and receiving device is that switch is an example, and the sending method and the method for reseptance of another kind of supervisory signal is provided, and as shown in Figure 4, comprises the steps:
The supervisory signal of the Power over Ethernet control device of striding equipment was injected on the central tap of the isolated transformer device that is arranged in the striding equipment end during step 302, middle striding equipment will come from.
Wherein, striding equipment was replied information such as Control and Feedback information or current running status during supervisory signal in the present embodiment was used to switch, make switch can in time obtain in the running status of striding equipment so that determine whether the centering striding equipment is further controlled adjustment.
The difference mode signal pin of step 312, the switch isolated transformer device by being positioned at the switch end extracts described differential mode service signal and forms service signal.
The central tap of step 313, the switch isolated transformer device by being positioned at the switch end extracts described common mode supervisory signal and forms supervisory signal.
Step 314 after forming above-mentioned supervisory signal, can also be exported to this supervisory signal the processor of switch.
The processor of switch can be by the register of above-mentioned kind of standard interface reading and writing PoE control chip, information such as running status according to the striding equipment of representing in this supervisory signal, and, determine whether the centering striding equipment is further controlled adjustment according to specific demand.
By the described method of present embodiment, realized sending supervisory signal to switch, so that the information such as running status of this striding equipment to be provided by middle striding equipment.Need not supervisory signal is inserted in the business, thereby can the throughput of valid data not impacted, optimized efficiency of transmission; In addition, receiving device need not to increase extra processor and complex decoding device, therefore implement simple and improvement cost low.
Equipment and system embodiment
Present embodiment provides a kind of Power over Ethernet system, as shown in Figure 5, comprise switch 10 and in striding equipment 20 as Power over Ethernet equipment, connect by twisted-pair feeder 30.Wherein, include control unit and isolated transformer device in each Power over Ethernet equipment.
Wherein, isolated transformer device is a kind of element of using in Ethernet, is made of some coil windings, and the element and the cable that will be used on the equipment are kept apart.The characteristic of isolated transformer device is: the difference mode signal on the cable can expedite coil windings by isolated transformer device be coupled to component side; Equally, the difference mode signal of component side also can be coupled to cable-side.But common-mode signal can't be passed through isolated transformer device.
Be connected with twisted-pair feeder in cable side at the described isolated transformer device of present embodiment, have difference mode signal pin and central tap.Wherein, the difference mode signal pin is used for service signal is coupled to formation differential mode service signal on the twisted-pair feeder, and is used for extracting described differential mode service signal formation service signal from differential mode service signal and common mode supervisory signal that twisted-pair feeder receives; The supervisory signal that central tap is used for injecting is added to and forms the common mode supervisory signal on the twisted-pair feeder, and is used for the differential mode service signal that receives from twisted-pair feeder and common mode supervisory signal and extracts the common mode supervisory signal and form supervisory signal.The absolute value of two potential values in the described differential mode service signal is identical, and polarity is opposite; The absolute value of two potential values in the described common mode supervisory signal is identical, and polarity is identical.
Above-mentioned central tap provides a path for the common mode supervisory signal, the supervisory signal that is injected by central tap can be transferred to and become the common mode supervisory signal on the twisted-pair feeder, and the difference mode signal on the twisted-pair feeder can't be exported by central tap, thereby realized isolation owing to cancel each other
Particularly, in the present embodiment, the control unit in the switch 10 is a processor 12, and isolated transformer device is the isolated transformer device 11 that is positioned at the switch end; Control unit in the middle striding equipment 20 is a Power over Ethernet control device 22, and isolated transformer device is the isolated transformer device 21 that is arranged in the striding equipment end.Its operation principle is as follows:
When switch 10 during to middle striding equipment 20 transmission signals, at transmitting terminal, switch 10 is coupled to the difference mode signal pin 1102 of the isolated transformer device 11 of service signal by being positioned at the switch end and forms the differential mode service signal on the twisted-pair feeder 30; The supervisory signal that will come from processor 12 is injected on the central tap 1101 of the isolated transformer device 11 that is positioned at the switch end, and forms the common mode supervisory signal on the twisted-pair feeder 30 that is added to; By twisted-pair feeder 30 common mode supervisory signal and differential mode service signal are transferred to middle striding equipment 20 then.
At receiving terminal, middle striding equipment 20 receives differential mode service signal and common mode supervisory signal from twisted-pair feeder 30; The difference mode signal pin 2102 of the isolated transformer device 21 by being arranged in the striding equipment end extracts the differential mode service signals and forms service signals; The central tap 2101 of the isolated transformer device 21 by being arranged in the striding equipment end extracts the common mode supervisory signal and forms supervisory signal; This supervisory signal is exported to the Power over Ethernet control device 22 of middle striding equipment 20.After Power over Ethernet control device 22 receives this supervisory signal, just can implement control to striding equipment in this 20 according to this supervisory signal.
In the middle of striding equipment 20 when switch 10 transmission signals, at transmitting terminal, middle striding equipment 20 is coupled to formation differential mode service signal on the twisted-pair feeder 30 with the difference mode signal pin 2102 of the isolated transformer device 21 of service signal by being arranged in the striding equipment end; The supervisory signal that will come from Power over Ethernet control device 22 is injected on the central tap 2101 of the isolated transformer device 21 that is arranged in the striding equipment end, and forms the common mode supervisory signal on the twisted-pair feeder 30 that is added to; By twisted-pair feeder 30 common mode supervisory signal and differential mode service signal are transferred to switch 10.
At receiving terminal, switch 10 receives differential mode service signal and common mode supervisory signal from twisted-pair feeder 30; The difference mode signal pin 1102 of the isolated transformer device 11 by being positioned at the switch end extracts the differential mode service signals and forms service signals; The central tap 1101 of the isolated transformer device 11 by being positioned at the switch end extracts the common mode supervisory signals and forms supervisory signals; This supervisory signal is exported to the processor 12 of switch 10.Make processor 12 to determine whether centering striding equipment 20 is further controlled adjustment according to the information such as running status of the striding equipment of representing in this supervisory signal 20.
In addition; for protective effect is provided, prevent that interface from damaging, and can also be provided with spacer assembly in Power over Ethernet equipment; between isolated transformer device and control unit, be used to isolate the potential difference of the Power over Ethernet equipment room of the Power over Ethernet equipment of transmitting terminal and receiving terminal.In present embodiment, the spacer assembly 13 of switch end can be set in switch 10, be connected with processor 12 and the isolated transformer device 11 that is positioned at the switch end respectively; The spacer assembly 23 of striding equipment end in can being provided with in middle striding equipment 20 is connected with Power over Ethernet control device 23 and the isolated transformer device 21 that is arranged in the striding equipment end respectively.Be used for the potential difference between isolated switch 10 and the striding equipment 20, damage to prevent interface.
By the described device of present embodiment, equipment and system, transfer management signal mutually between sending ending equipment and the receiving device; And, need not supervisory signal is inserted in the business, thereby can the throughput of valid data not impacted, optimized efficiency of transmission; In addition, need not to increase extra processor and complex decoding device in the controlled equipment, therefore implement simple and improvement cost low.
Need to prove herein, more than each embodiment the situation of transmitting differential mode service signal and common mode supervisory signal on twisted-pair feeder is simultaneously had been described in detail, if but on twisted-pair feeder, only transmit the common mode supervisory signal and do not transmit the differential mode service signal, more than each embodiment also can be suitable for equally, just will get final product, repeat no more herein relevant for the step deletion that the differential mode service signal is sent and receives.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the sending method of a supervisory signal, be used for the Power over Ethernet system, comprise: sending ending equipment is coupled to the difference mode signal pin of the isolated transformer device of service signal by being positioned at transmitting terminal on the twisted-pair feeder, form the differential mode service signal, the absolute value of two potential values in the described differential mode service signal is identical, and polarity is opposite;
It is characterized in that, also comprise:
Described sending ending equipment is injected into supervisory signal on the central tap of the described isolated transformer device that is positioned at transmitting terminal;
The supervisory signal that injects is added to forms the common mode supervisory signal on the twisted-pair feeder, and the absolute value of two potential values in the described common mode supervisory signal is identical, and polarity is identical;
By described twisted-pair feeder, described common mode supervisory signal and described differential mode service signal are transferred to receiving device jointly.
2. the method for reseptance of a supervisory signal is used for the Power over Ethernet system, it is characterized in that comprising:
Receiving device receives common mode supervisory signal and differential mode service signal from twisted-pair feeder;
The central tap of the isolated transformer device by being positioned at receiving terminal extracts described common mode supervisory signal and forms supervisory signal.
3. isolated transformer device, be used for the Power over Ethernet system, it is characterized in that comprising: central tap, be connected with twisted-pair feeder, the supervisory signal that is used for injecting is added to and forms the common mode supervisory signal on the described twisted-pair feeder, and is used for the differential mode service signal that receives from described twisted-pair feeder and common mode supervisory signal and extracts described common mode supervisory signal and form supervisory signal.
4. isolated transformer device according to claim 3, it is characterized in that also comprising: the difference mode signal pin, be connected with twisted-pair feeder, be used for service signal is coupled to formation differential mode service signal on the described twisted-pair feeder, and be used for extracting described differential mode service signal formation service signal from differential mode service signal and common mode supervisory signal that described twisted-pair feeder receives.
5. isolated transformer device according to claim 4 it is characterized in that the absolute value of two potential values in the described differential mode service signal is identical, and polarity is opposite; The absolute value of two potential values in the described common mode supervisory signal is identical, and polarity is identical.
6. Power over Ethernet equipment that comprises arbitrary described isolated transformer device in the claim 3～5, it is characterized in that also comprising: control unit, be used to produce the central tap that control signal is injected into described isolated transformer device, and be used to receive the supervisory signal of exporting from described central tap.
7. Power over Ethernet equipment according to claim 6, it is characterized in that also comprising: spacer assembly, between described isolated transformer device and described control unit, be used to isolate the potential difference of the Power over Ethernet equipment room of the Power over Ethernet equipment of transmitting terminal and receiving terminal.
8. Power over Ethernet system that comprises the described Power over Ethernet equipment of claim 6 is characterized in that:
Described Power over Ethernet equipment is switch, and described control unit is a processor; Perhaps,
Described Power over Ethernet equipment is middle striding equipment, and described control unit is the Power over Ethernet control device;
Described switch is connected by twisted-pair feeder with described middle striding equipment.
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| CN113300350B (en) * | 2021-07-26 | 2021-11-19 | 天津深之蓝能源科技有限公司 | Power supply system applied to underwater equipment |
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| CN2786874Y (en) * | 2005-04-07 | 2006-06-07 | 重庆邮电学院 | Ethernet bus power supply equipment capable of supplying high power |
| CN101043341A (en) * | 2006-03-24 | 2007-09-26 | 美国博通公司 | Inband management for power over Ethernet midspans using an embedded switch |
| CN101061668A (en) * | 2004-11-19 | 2007-10-24 | 凌特公司 | Analog power management within power over Ethernet system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101061668A (en) * | 2004-11-19 | 2007-10-24 | 凌特公司 | Analog power management within power over Ethernet system |
| CN2786874Y (en) * | 2005-04-07 | 2006-06-07 | 重庆邮电学院 | Ethernet bus power supply equipment capable of supplying high power |
| CN101043341A (en) * | 2006-03-24 | 2007-09-26 | 美国博通公司 | Inband management for power over Ethernet midspans using an embedded switch |
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Effective date of registration: 20140624 Address after: 100085 Beijing city Haidian District No. 33 Xiaoying Road 1 1F06 room Patentee after: BEIJING ZHIGU TECHNOLOGY SERVICES CO., LTD. Address before: 100036 Beijing Haidian District City 33 Fuxing Road Cuiwei East 1106 Patentee before: Beijing Xingwang Ruijie Network Technologies Co., Ltd. |
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Application publication date: 20090408 Assignee: Beijing Xingwang Ruijie Network Technologies Co., Ltd. Assignor: BEIJING ZHIGU TECHNOLOGY SERVICES CO., LTD. Contract record no.: 2014990000764 Denomination of invention: Management signal transmitting/receiving method and apparatus, Ethernet power supply unit and system Granted publication date: 20110105 License type: Common License Record date: 20140923 |
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