Background technology
As everyone knows, the power consumption of conventional telephone set is very little, be about about 2W, by telecommunication bureau at far-end by phone-line-powered, direct more more reliable and make things convenient for than user side with mains-supplied.
At present, the network interface that is arranged on wall or the desktop only provides data message, not supply of electric power.Perhaps, this situation can not become problem in the desktop PC epoch, but for the current very little network-termination device of power consumption that generally uses, being undoubtedly a kind of sorryly, then may be flagrant for the conferencing over ip service that IP phone and real-time are had relatively high expectations.As when user side has a power failure, though the user network switch can provide data to the user, can not provide service to the user, provide data itself also just to lose meaning so.Therefore the condition of power supply that improves this network termination type has become a kind of needs.
In traditional network, the user network switch is placed between the equipment of horizontal subsystem, generally is furnished with ups power, makes the network-termination device height of user's network switch power supply rank than user side, and this has just supplied possibility indescribably for the power stage that improves user side.
Traditional comprehensive wiring system adopts the IEEE802.3 local area network standard, the basic physical transmission medium that connects as network with CAT5 copper cable twisted-pair feeder (UTP).When the comprehensive wiring system tectonic network, generally adopt two pairs of lines among 4 couples of UTP as data transmission media, all the other two pairs of lines do not use, and this provides transmission medium for realizing the local area network (LAN) remote power feeding.
Because the miniaturization of network-termination device, its power consumption has the trend that constantly alleviates, and as the IP phone machine, its power consumption is not more than 3W; Simultaneously, the dependability of network-termination device is had relatively high expectations usually, as equipment such as the remote monitoring video camera that is connected with network, IP phone machine, facsimile machine, voice mails.If can adopt the local area network (LAN) remote power feeding, the user only needs just network-termination device to be connected on the network interface of wall or desktop by a netting twine so, do not re-use external power supply, then easy to use flexibly and needn't worry equipment work to be brought influence because of user side has a power failure.
The world local area network standard committee has set up the local area network (LAN) power supply research group that abbreviates IEEE802.3af working group as in 1998, be intended to strengthen the research work of local area network (LAN) power supply technique and relevant standard formulation, but the also informal so far corresponding standard of announcing.In present research on standard,, concrete implementation method is not explained in detail though the form of the Power Limitation of feeder ear and user side, the restriction of data terminal equipment power supply index and user front end circuit has been proposed suggestion.As, be 14W to the Power Limitation of user side, but do not propose the method for power expansion; The power supply index of data terminal equipment is restricted to maximum 50 to 300mA, does not but propose the method for grading control, also not have the solution of proposition when the user need be greater than the 300mA electric current; The user front end circuit there is not the electric power polarity recognition function; The problem of recovering certainly after the system that do not mention breaks down and the remote monitoring problem of electric power system; Do not have to propose to be applicable to that the power transmission line of heterogeneous networks is to selection scheme.
According to the IEEE802.3 local area network standard, in comprehensive wiring system, when adopting CAT5 twisted-pair feeder (UTP) tectonic network, generally adopt two pairs of lines among 4 couples of UTP as data transmission media.For 10Base TEthernet Ethernet, 100 BaseTX, 100 Base VG, adopting sequence number is 1,2, four lines of 3,6, then adopting sequence number for Token Ring network is 3,6, four lines of 4,5, using sequence number at FDDI/TP-PMD, ATM net is 1,2, four lines of 7,8 then use whole four pairs of cables in 100 Base T4 and some 100 Base VG net.As seen, in multi-form network, can't select the dead pair of same numeral to make power line.
In sum, realize that the local area network (LAN) remote power feeding helps network terminal user, but also be in the state of no corresponding implementation method and equipment at present.
Summary of the invention
The objective of the invention is to design a kind of implementation method and equipment of local area network (LAN) remote power feeding, at deficiency cited in the background technology, utilize the resource of existing network comprehensive wiring system, for multimedia mininet terminal equipment also provides electric power when data message is provided, more reliably be user's service easily.
The technical scheme that realizes the object of the invention is such: a kind of implementation method of local area network (LAN) remote power feeding is characterized in that comprising:
A. utilize the network comprehensive lining system to set up the local area network (LAN) remote electric power system, one end is connected power supply hub, other end connecting terminal adapter at the twisted pair transmission line of network comprehensive lining system;
B. power supply hub the data-signal from user network exchange data port that input port is introduced carries out compoundly with power supply to network-termination device, by twisted pair transmission line the common cable of realizing data and power supply is transmitted;
C. terminal adapter is isolated power supply and data, and provides data-signal and power supply respectively by data output interface and power output interface;
D. remotely administered server is connected on the power supply hub by network, the local area network (LAN) remote electric power system is carried out the remote power feeding management.
The technical scheme that realizes the object of the invention still is such: a kind of equipment of local area network (LAN) remote power feeding is characterized in that:
Comprise power supply hub and terminal adapter, the input port of power supply hub connects the FPDP of user network switch, it is right that the compound output port of power supply hub connects the twisted pair transmission line of network comprehensive lining system, it is right that the compound input port of terminal adapter connects the twisted pair transmission line of network comprehensive lining system, and the output port of terminal adapter comprises power output interface and data output interface;
Described power supply hub comprises the output composite module of a power supply and data at least, to from the data of user network exchange data port and the power supply of network-termination device is carried out compound, realize composite signal twisted pair transmission line on common cable transmission;
Described terminal adapter comprises at least and the complex input interface of data and power supply composite signal is separated that isolated power supply and data are sent corresponding power output interface and data output interface respectively.
The local area network (LAN) remote electric power system that utilizes the inventive method to realize, the power supply hub is connected by one 5 class line (4 pairs of twisted-pair feeders) with terminal adapter, the input port of power supply hub upwards connects the FPDP of user network switch, data and power supply send compound output port after compound in the power supply hub, compound output port connects the service area subsystem of user network wiring system downwards.The compound input port of terminal adapter upwards connects the service area subsystem of user network wiring system, finishes separating of data and power supply, and the data output interface and the power output interface of standard is provided, and uses for network-termination device.
Power supply hub inside has the network communication function.
In the application of the legacy network terminal equipment that does not satisfy the remote power feeding agreement, can solve compatibility issue with the power supply type local area network (LAN) preferably by terminal adapter.
Remotely administered server is arbitrary the computer that is connected with the power supply hub by network, by the operation power management software, realizes the telemanagement to electric power system.
Each road power supply output in the compound output port of power supply hub all has the protection monitoring function; when the power supply overtension; or when the local loop load overweight; or during the restriction of transmission twisted-pair feeder short circuit current overtime; remotely administered server is carried out outage control to the power supply output loop of power supply hub; after transmission or the eliminating of subscriber line circuit fault, the control automatic recovery of power supply.
The compound output port of power supply hub satisfies the machinery and a series of standard-requireds such as electrical characteristic, interface radiation and interference characteristic, interface data transmission speed and security feature of lan interfaces, and has the characteristics simple, easy to maintenance of installing, the DTE equipment of compatible legacy interface form simultaneously.
The present invention adopts data and power supply cable transmission means altogether, adopts DC power supply also to limit supply current, thereby avoids and reduced issuable interference problem between the transmission signals; Adopt electric capacity and inductance isolation method to realize data and the same line of power supply to transmission, the line of transmission is bigger to the choice.If adopt data and power supply not collinear to transmission means, circuit is simple and convenient.
Terminal adapter of the present invention is applicable to the user side of local area network (LAN) remote power feeding, finishes separating and the supply voltage conversion of data and power supply, and the data-interface and the rated voltage output of non-remote power feeding agreement are provided for subscriber network terminal equipment.
Terminal adapter of the present invention can be an independent external device, also can be placed on network-termination device inside, the user port that does not satisfy the remote power feeding standard is transform as the user port that meets the remote power feeding agreement.
Terminal adapter design of the present invention has polarity identification circuit, thereby guarantees the nonpolarity access of power supply input lead, for use brings convenience.
Terminal adapter of the present invention can have the Presentation Function that remote power feeding has or not by power indicating circuit is set.
The most outstanding substantive distinguishing features of the present invention is: adopt power supply hub and terminal adapter to form the local area network (LAN) remote electric power system; be applicable to the twisted-pair feeder to be the multi-form local area network (LAN) of transmission medium, have overvoltage protection, short-circuit protection, fault eliminating back power supply from recovering and the remote real-time monitoring function.Simultaneously, the equipment of various different capacities and current level can be provided according to the requirement of the different user network equipment, make full use of existing Internet resources, under the situation that does not change the user network structure, provide more reliable, the convenient easy-to-use remote power feeding service of similar conventional telephone set for the disparate networks user.
Embodiment
Realization system and equipment referring to local area network (LAN) remote power feeding shown in Figure 1.
The local area network (LAN) remote electric power system is made up of three parts: power supply hub 11, terminal adapter 12 and remotely administered server 13 (the telemanagement computer of power supply hub).The transmission line of power supply hub 11 and 12 of terminal adapters is to being to utilize the twisted-pair feeder of network comprehensive lining system to be connected 14, power supply hub 11 sides connect user network switch 15 by FPDP, obtain the transmission data, with be connected power of alterating and direct current by power port, DC power supply can be by storage battery 16 power supply.Terminal adapter 12 is provided with data output interface and power output interface, and being respectively subscriber terminal equipment provides remote power feeding and transmit data.
Power supply hub 11 is cores of local area network (LAN) remote electric power system, is arranged in the front end of network comprehensive lining system horizontal subsystem, upwards connects riser backbone subsystem, connects horizontal subsystem downwards.
The input of terminal adapter 12 upwards connects horizontal subsystem, and output is connected subscriber terminal equipment by data output interface with power output interface, solves the compatibling problem of local area network (LAN) remote power feeding network and legacy network simultaneously.
Remotely administered server 13 is arbitrary computers that operate on the local area network (LAN), by the operation power management software, can control the local area network (LAN) remote electric power system, comprise by ether interface the power supply hub is carried out the setting of FPDP, the bookkeepings such as switching of the inquiry of FPDP state, the switch of power supply, storage battery.13 pairs of local area network (LAN) remote electric power systems of remotely administered server are implemented the power supply management function, can carry out the real time remote management to power supply by network.
Embodiment among the figure, transmission line is selected category 5 twisted pair (4 couples of UTP) to 14.
According to the IEEE802.3 local area network standard, when the comprehensive wiring system tectonic network that utilizes by CAT5 twisted-pair feeder (UTP), generally adopt two pairs of lines among 4 couples of UTP as data transmission media.As described in the background art, in multi-form network,, therefore can't select the dead pair of same numeral to make power line because employed cable label is different.
Thereby for different networks, but a kind of method in common is exactly to adopt the conllinear transmission of power supply and signal, makes and selects transmission line to bigger leeway is arranged.11 pairs of power supplys of power supply hub and data are carried out the transmission of compound back, are separated into power supply and data by terminal adapter 12 again, are exported by different port.
For two kinds of local area network (LAN)s (10 Base T and Ethernet Token Ring) structure commonly used, can select for use 7,8 idle lines to as power transmission line, 7 (palm fibre is white) connect positive source, and 8 (palm fibres) connect power cathode.
Because allow the sustained ceiling current that flows through relevant with the temperature rise that circuit allows on the transmission line, the power of line loss is big more, and the voltage rise time is long more, and the circuit temperature rise is high more.Therefore single power that can transmit transmission line is limited, is a user port power supply if adopt many simultaneously to line, can improve supply current, carries out power expansion.
Referring to Fig. 2, Fig. 3, power supply hub principle realizes circuit theory as shown in Figure 3 as shown in Figure 2.
The power supply hub mainly comprises power conversion module 1, storage battery 16, switch module 3, power supply output module 4, the compound output module 5 of power data, power state detection indicating module 6, Ethernet interface 7, CPU 8, control interface module 9, memory 10 and FPDP 11.
Power transfer module 1 (M1 among Fig. 3), finish the 220V electric main to-48V or-64V (shown in the figure-conversion of 48V) network communication DC power supply, provide charge power supply for storage battery 16 simultaneously and finish by power conversion module 1 or by the switching in storage battery 16 output DC sources.
Storage battery 16 is the secondary power supply of system.
Switch module 3 (M2 among Fig. 3) is finished the switch control of multichannel (shown in Fig. 3 four tunnel) power supply output.
Power supply output module 4 (IC1 among Fig. 3) is realized the control of each road (shown in Fig. 3 two tunnel) power supply output, simultaneously to each road power supply output carrying out overvoltage protection, lightning protection electric shock protection etc.
The compound output module 5 of power data (M4 among Fig. 3) is finished the multiplexing of data and power supply, realizes the common cable transmission of data and power supply.FPDP 11 trouble free services when this compound output module guarantees power supply and the transmission of data conllinear and interference-free.Among Fig. 4, S1, D1, S2, D2 are the RJ45 interface, and S1, S2 are compound output port, connect comprehensive wiring system, and D1, D2 are FPDP, connect the FPDP of the network switch.But S1 and D1, S2 and D2 do not carry out data and the compound same label terminal multiple connection of power supply, and can connect three pairs of data-signals waiting for transmission simultaneously.Realize the compound transmission of dateout and power supply shown in the figure by the 7th, 8 two terminal of S1, S2 free time, in like manner, (cut off Alternating Component as long as increase inductor L1, L2 (raising AC impedance) and block capacitor C1, C2 as shown in the figure, guarantee that D1, D2 import/fail safe when going out data), just can realize on eight terminals of S1, S2 the compound transmission of four pairs of data and power supply.Therefore.Said structure has realized that in multi-form network can using arbitrarily, the cable label carries out the local area network (LAN) remote power feeding.On the RJ45 socket of S1, S2, on its input port and output port, power supply indicator can be set.The power supply hub adopts the multiport input/output structure, and each is used the corresponding network terminal port of input/output port.Be input as common FPDP, be output as the compound port of data power supply.
Exporting compound port power can select for use any line among 1-2,3-6,4-5, the 7-8 right.
Power state detection indicating circuit 6 (M3 among Fig. 3 and peripheral LED 1, LED2, LED3, the LED4 that connects thereof); electric current restriction, overcurrent protection are carried out in the output of power supply output module 4; with power supply status is detected and indicates, for power management provides necessary foundation.Among Fig. 3, when line current is in normal range of operation, the normal output of system's power supply, the 1 road and the 2 tunnel relay indicating light LED2 and LED4 show green, short-circuit protection indication LED 1 and LED3 do not work; When line short or load surpassed the lowest high-current value of default, power supply output was cut off, and system enters guard mode, and relay indicating light LED2 and LED4 extinguish, and LED1 and LED3 show red.After circuit and load restoration were normal, system withdrawed from guard mode automatically, and output restores electricity.Line current detects, lowest high-current value is set and the protection employing realizes from recovering device; the state information of circuit is passed to remotely administered server (13) through Ethernet interface 7 (IC2 among Fig. 3) again after control interface module 9 (IC5 among Fig. 3) send singlechip CPU (IC4 8051 among Fig. 3) to handle simultaneously.If the output of a certain road is in guard mode for a long time; remotely administered server this moment (13) can send the data of cutting off this road power supply by network; after single-chip microcomputer IC4 8051 handles; by interface control module 9 (IC5 among Fig. 3) driving switch module 3 (M2 among Fig. 3), this road power supply output is cut off in control.Above-mentioned real time monitoring function, when network user's circuit broke down, the control power supply disconnected, and when the subscriber line circuit fault was got rid of, the control power supply recovered automatically.
By power state detection indicating circuit 6 is set; make each compound output port that independently power supply open circuit and short-circuit detecting circuit and open circuit and short-circuit condition demonstration all be arranged; each compound output port all has from the recovery and protection circuit; the output current grade of each compound output port can set in advance, and each compound output port is if choose a plurality of lines simultaneously to realizing big electric current power supply.
(IC2 among Fig. 3 RTL8019), comprises a network and receives and dispensing device, so that carry out telemonitoring and management by network Ethernet interface 7.The content that monitors comprises the operating state, size of current grade of each port on the Ethernet interface etc.
CPU 8 (IC4 8051 among Fig. 3) is the single-chip microcomputer of control hub, handles the information and the network management data of power state detection indicating module 6, control power conversion module 1 and switch module 2.
Control interface module 9 (IC5 among Fig. 3) connects CPU 8, realizes the controlling and driving of 8 pairs of power conversion modules 1 of CPU and switch module 2.
Memory 10 is used to store data and program.
FPDP 11 (D1 among Fig. 3, D2) is used to insert data waiting for transmission, is connected with the FPDP of user network switch.
The power supply hub with traditional network data interface and power interface compound be the compound port of legacy network interface shape, satisfy the transmission requirement of comprehensive wiring system.
Shown in Fig. 3 center 5 is to adopt inductance L, the power supply of capacitor C isolation and the compound circuit of data, if adopt the right mode of independent line, promptly independent power line and data signal line then do not have L, C buffer circuit, meet simple and practical principle, and can control the interference of power supply the biglyyest data.
Referring to Fig. 4, terminal adapter mainly comprises complex input interface 21, polarity identification circuit 22, DC circuit 23, power output interface 24, data output interface 25 and power indicating circuit 26.
Complex input interface 21 can be connected on the compound output port of being powered by local area network (LAN), this port can be arranged on desktop or the metope, (its separation was public technology after complex input interface 21 was finished separating of data and power supply, its separation method or structure repeat no more), data portion dispensing data output interface 25, power unit then send the DC circuit behind polarity identification circuit 22, convert to behind the voltage of standard by power output interface 24 outputs, utilize this two interfaces 24 for the user, 25 connecting terminals, simultaneously, this power unit also through sampling rear drive power indicating circuit 26, makes things convenient for the user to understand the power supply situation.
The use that polarity identification circuit 22 can be the user is set brings convenience, avoid discerning trouble that electric power polarity brings and the wiring error that may cause.
Because the distance of level wiring changes with the variation of endpoint location in the comprehensive wiring system, as 100 meters with interior variation, caused loop resitance changes can reach 20 ohm, when the employed electric current of network-termination device not simultaneously, all will cause the variation of end voltage, adopt DC circuit 23 just the power supply from local area network (LAN) can be become the DC power supply that meets the network-termination device instructions for use, therefore, 23 pairs of input voltages of requirement DC circuit have the excursion of broad, to adapt to the requirement that the different length transmission line uses.DC-DC translation circuit 23 adopts high efficiency switching circuit, to reduce the useless consumption of electric energy as far as possible.By terminal adapter is set,, can use desktop or wall jack to solve compatible requirement for the legacy network terminal equipment that does not satisfy the remote power feeding agreement.After power supply and the data separating, data are exported from data-interface, and power supply is through the identification of polarity automatic identification circuit, and after the DC processing of circuit, from power interface output is the rated voltage that meets customer requirements again.
Terminal adapter is finished separating of power supply and data, realizes the conversion of voltage simultaneously, for the network equipment of not supporting the remote power feeding agreement provides the data-interface and the power interface of standard, uses when satisfying its data and power supply or uses separately.
Terminal adapter can be designed to comprise the structure of a compound input port, a data interface and a power interface.Three kinds of interfaces meet interface standard separately respectively.The Presentation Function that complex input interface can have remote power feeding to have or not.
The present invention adopts power supply hub and terminal adapter to form the local area network (LAN) remote electric power system, and the power supply line can be that the non-data wire in 4 pairs of twisted-pair feeders is right, also can be multiplexing with pair of data lines wherein, and allow power supply and data be total to the cable transmission.Technical scheme of the present invention is applicable to 10 Base T Ethernet Ethernets, 100 BaseTX nets, 100 Base VG nets, Token Ring net, FDDI/TP-PMD net, ATM net and the 100 Base T4 nets with the comprehensive wiring system structure of CAT5 twisted-pair feeder (UTP).
Technical scheme of the present invention, by designing power supply hub and terminal adapter with utilize the resource of existing network comprehensive wiring system, realized the local area network (LAN) remote power feeding, when multimedia mininet terminal equipment provides data, also providing power devices, made things convenient for the user.