CN206402232U - A kind of communication system - Google Patents
A kind of communication system Download PDFInfo
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- CN206402232U CN206402232U CN201621036988.8U CN201621036988U CN206402232U CN 206402232 U CN206402232 U CN 206402232U CN 201621036988 U CN201621036988 U CN 201621036988U CN 206402232 U CN206402232 U CN 206402232U
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Abstract
The utility model provides a kind of communication system, including：Device of optical network unit, headend, trunking and terminal device, device of optical network unit are connected by netting twine with headend, and headend is connected by cable with trunking, and trunking is connected by cable with terminal device；The system is docked by device of optical network unit with optical line terminal optical line terminal, receive the downlink data sent with form of light waves and send data signal, then data signal is received by headend, and it is converted into the carrier signal that can be transmitted in the cable, gain is carried out to the carrier signal by trunking simultaneously, to make up the loss in transmitting procedure, above-mentioned carrier signal is received eventually through terminal device, and be converted into data signal and send to user terminal, realize the mixed networking of fiber optic communication and carrier communication, it is possible thereby to reduce laying for optical fiber on communication line, and then reduce communication line construction cost, to reduce communications cost.
Description
Technical field
The utility model is related to data communication field, and in particular to a kind of communication system.
Background technology
Electrical power distribution automatization system is the important technical for lifting power distribution network production management level and improving power supply reliability,
It is also one of main contents that intelligent grid is built.State Grid Corporation of China is just in all-round construction using extra-high voltage grid as backbone network
Based on frame, the sturdy power grid of electric network coordination at different levels development, with informationization, automation, the interactive autonomous innovation being characterized, state
The leading strong intelligent grid in border.Intelligent grid is on the basis of information pattern that is open and interconnecting, to pass through loading system numeral
Equipment and upgrading electricity grid network management system, realize generating, transmission of electricity, power supply, electricity consumption, client's sale of electricity, power network graded dispatching, synthesis
Full-range intelligent, information-based, the classificationization interactive management of the power industries such as service, is to have gathered Industrial Revolution, technological revolution
Changed with the comprehensive efficiency of management revolution.
Fiber optic communication is Primary communication mode in electrical power distribution automatization system transformation.But see with practical conditions, for not reserving
Communication pipe region, cost of investment is larger, constructional difficulties；For reserving communication pipe region, due to surface subsidence, other pipes
The reasons such as road construction, 20%-30% pipeline is obstructed, causes optical fiber not pass through, it can be seen that, single use fiber optic communication
The cost that system carries out networking is higher.
The content of the invention
Therefore, technical problem to be solved in the utility model is to reduce communications cost, the practicality of communication system is improved
Property.
The utility model provides a kind of downstream signal processing system, including：Device of optical network unit, for receiving optical link
The optical signal that terminal optical line terminal is sent, and the optical signal is converted into data signal, send the data signal；Head end
Equipment, is connected by netting twine with the device of optical network unit, is turned for receiving the data signal, and by the data signal
Carrier signal is changed to, the carrier signal is sent；Trunking, is connected by cable with the headend, for receiving
Carrier signal is stated, and gain is carried out to the carrier signal, the carrier signal after gain is sent.Terminal device, by cable with
The trunking connection, for receiving the carrier signal after the gain, and is converted into data signal, to the first user
Terminal sends the data signal.
Preferably, the trunking is additionally operable to the carrier signal being converted to data signal, and sends to the second use
Family terminal.
Preferably, in addition to：First coupler and the second coupler, the headend by first coupler with
The first end connection of first cable, the trunking is connected by the second end of second coupler and first cable
Connect, wherein first coupler is used to the carrier signal being coupled in first cable, second coupler is used
It is coupled in by the carrier signal in the first cable in the trunking.
Preferably, in addition to：3rd coupler and the 4th coupler, the trunking by the 3rd coupler with
The first end connection of second cable, the terminal device is connected by the second end of the 4th coupler and second cable
Connect, wherein the 3rd coupler is used to the carrier signal after the gain being coupled in second cable, the described 4th
Coupler is used to the carrier signal after the gain in the second cable being coupled in the terminal device.
Preferably, first cable is the power transmission cable between the first switching station and the second switching station, first cable
First end be the ring main unit in first switching station leading-out terminal, the second end of first cable is second opening and closing
In ring main unit end of incoming cables；
Second cable is the power transmission cable between second switching station and the 3rd switching station, the of second cable
One end is the leading-out terminal of the ring main unit in second switching station, during the second end of second cable is the 3rd switching station
Ring main unit end of incoming cables.
Preferably, the headend generates the carrier signal using OFDM modulation systems, and is believed according to the carrier wave
Number transmission quality determine the working frequency of the carrier signal.
Preferably, the trunking and the terminal device are additionally operable to the carrier signal sent according to the headend
Frequency determine its own signal transmission frequency.
Preferably, the headend is used to send training data, the relaying to the trunking and terminal device
Equipment and terminal device are used to determine the working frequency of itself according to the training data
The downstream signal processing system provided according to the utility model, passes through device of optical network unit and optical line terminal light
Line terminal is docked, and is received the downlink data sent with form of light waves and is sent data signal, is then received by headend
Data signal, and the carrier signal that can be transmitted in the cable is converted into, while by trunking to the carrier signal
Gain is carried out, to make up the loss in transmitting procedure, above-mentioned carrier signal is received eventually through terminal device, and be converted into
Data signal is sent to user terminal, realizes the mixed networking of fiber optic communication and carrier communication, it is possible thereby on communication line
Laying for optical fiber is reduced, and then reduces communication line construction cost, to reduce communications cost.
Brief description of the drawings
In order that content of the present utility model is more likely to be clearly understood, below according to specific implementation of the present utility model
Example and with reference to accompanying drawing, the utility model is described in further detail, wherein
Fig. 1 is the structural representation for the communication system that the utility model embodiment 1 is provided；
Fig. 2 is the concrete structure diagram for the communication system that the utility model embodiment 1 is provided；
Fig. 3 is the flow chart for the communication means that the utility model embodiment 2 is provided.
Embodiment
Embodiment 1
Example provides a kind of communication system, including：Device of optical network unit 11, headend 12, trunking 13 and terminal
Equipment 14, device of optical network unit 11 is connected by netting twine with headend 12, and headend 12 passes through cable and trunking
13 connections, trunking 13 is connected by cable with terminal device 14；
Wherein, device of optical network unit 11 includes the first downstream signal processing unit and the first upward signal processing unit,
The first downstream signal processing unit is used for the optical signal for receiving optical line terminal transmission, and is converted into data signal,
Head-end equipment 12 sends data signal；The first upward signal processing unit is used for the numeral for receiving the transmission of headend 12
Signal, and optical signal is converted into, send optical signal to optical line terminal；Device of optical network unit 11 is ONU (Optical
Network Unit)；The optical line terminal（OLT, optical line terminal）The optical signal of transmission can be with wide
The downlink communication data for the use light wave morphology that broadcast mode is sent, after conversion, the first downstream signal processing unit can be sent
Meet the data signal of the standards of IEEE 802.3, for representing downlink communication data;First upward signal processing unit is to OLT
The optical signal sent is the uplink communication data using light as transmission medium.
Headend 12 includes the second downstream signal processing unit and the second upward signal processing unit, and described second is descending
Signal processing unit is used for the data signal for receiving optical network unit transmission, and is changed to carrier signal, to trunking 13
Send carrier signal；Second upward signal processing unit is used to receive the carrier signal after the gain of the transmission of trunking 13, and
Data signal is converted into, data signal is sent to optical network unit；Headend 12 can be provided with carrier signal processing
The equipment of chip, such as electric power modem, the effect of the second downstream signal processing unit is to meet IEEE 802.3 by above-mentioned
The data signal of standard is converted into being adapted to the analog electrical signal in power line transmission by processing, for representing downlink communication number
According to.Specifically, i.e., the port of headend 12 is received to the data signal for meeting IEEE802.3 standards come by encryption, volume
Code, modulation treatment, are converted to the carrier wave analog signal for being adapted to transmit in power cable.Second upward signal processing unit is acted on
The data signal that the carrier signal received is converted into being adapted to transmit in netting twine by processing, for representing uplink communication number
According to.Specifically, i.e., the device port is received the carrier signal that comes be demodulated, decryption processing, be converted to and meet
The data signal of IEEE802.3 standards.
Trunking 13 includes gain unit, and the gain unit is used for the carrier signal for receiving the transmission of headend 12,
And gain is carried out to it, send the carrier signal after gain to terminal device 14；It is additionally operable to the load of the transmission of receiving terminal apparatus 14
Ripple signal, and gain is carried out to it, head-end equipment 12 sends the carrier signal after gain；Because carrier signal is substantially one
Electromagnetic signal is planted, so itself can decay with the increase of transmission range.Trunking 13 can be provided with gain
The equipment for managing chip, it can carry out signal gain to carrier signal, and making up signal, the signal of transmission declines over long distances in the cable
Subtract, make up loss.
Terminal device 14 includes the 4th downstream signal processing unit and the 4th upward signal processing unit, and the described 4th is descending
Signal processing unit is used to receive the carrier signal after the gain of the transmission of trunking 13, and is converted into data signal, to
First user terminal 15 sends data signal；4th upward signal processing unit is used to receive the number that the first user terminal 15 is sent
Word signal, and carrier signal is converted into, send carrier signal to trunking 13.Terminal device 14 can be provided with carrier wave
The equipment of signal processing chip, such as electric power modem, the effect of the 4th downstream signal processing unit will be received
The data signal that carrier signal is converted into being adapted to transmit in netting twine by processing, for representing downlink communication data.Specifically,
The device port is received the carrier signal that comes be demodulated, decryption processing, be converted to the number for meeting IEEE802.3 standards
Word signal, is then sent to the first user terminal 15 complete the transmission process of downlink data.The processing of 4th upward signal is single
The effect of member is that the data signal for meeting the standards of IEEE 802.3 for sending the first user terminal 15 is converted into fitting by processing
The analog electrical signal in power line transmission is closed, for representing uplink communication data.Specifically, i.e., slave unit port was received
The data signal for meeting IEEE802.3 standards is converted to by encryption, coding, modulation treatment and is adapted to pass in power cable
Defeated carrier wave analog signal.
The communication system provided according to the utility model, can pass through device of optical network unit 11 and optical line terminal pair
Connect, receive the downlink data sent with form of light waves and send data signal, data signal is then received by headend 12,
And the carrier signal that can be transmitted in the cable is converted into, while being increased by 13 pairs of carrier signals of trunking
Benefit, to make up the loss in transmitting procedure, receives above-mentioned carrier signal, and be converted into numeral eventually through terminal device 14
Signal is sent to user terminal, to complete downlink communication process；And the number that user terminal is sent can be received by terminal device
Word signal is converted into the carrier signal that can be transmitted in the cable, and gain is carried out to the carrier signal by trunking,
To make up the loss in transmitting procedure, then by the carrier signal after headend gain acceptance in, and numeral is converted into
Signal, receives the data signal, and be converted into the light for being adapted to transmit in a fiber eventually through device of optical network unit
Signal is sent to optical line terminal, to complete uplink communication process.The system can realize the mixed of fiber optic communication and carrier communication
Charge-coupled net, it is possible thereby to reduce laying for optical fiber on communication line, and then reduces communication line construction working, reduction is communicated into
This.
The system is particularly suitable for use in power distribution automation transformation process not reserving communication pipe or communication pipe is obstructed
Region（Because pipeline is obstructed etc. caused by the reasons such as surface subsidence, other pipeline constructions）Although such region can not lay light
Fibre, but cable run is provided with mostly.In this case end can be reached in optical fiber and sets up the above-mentioned He of device of optical network unit 11
Headend 12, sets up bandwidth carrier terminal/trunking 13, you can complete the obstructed point of optical fiber in obstructed position of local optical fiber
Communication network to main website platform is set up, and is P2P（Point-to-point mode）Or P2MP（Point-to-multipoint mode）.The system
Any construction need not be carried out on communication line, only need to can be complete after installation and debugging the said equipment on existing communication line
Into the construction of power distribution communication net.
Due to the position of trunking 13 may also it is in need reception and send communication data user terminal, institute more than
The 3rd downstream signal processing unit and the 3rd upward signal processing unit can also be included by stating trunking, wherein under the described 3rd
Row signal processing unit is used to receive the carrier signal that the headend is sent, and the carrier signal is converted into digital letter
Number, and send to second user terminal；The 3rd upward signal processing unit is used to receive the second user terminal transmission
Data signal, and be converted into carrier signal, the carrier signal sent to the headend.That is trunking 13
Carrier signal process chip, the carrier wave that its 3rd downstream signal processing unit can be sent to the port of headend 12 can be provided with
Signal is demodulated, decryption processing, is converted to the data signal for meeting IEEE802.3 standards, is then sent to second use
Family terminal 16 completes the transmission process of downlink data.Its 3rd upward signal processing unit can send second user terminal 16
The data signal for meeting the standards of IEEE 802.3 be converted into being adapted to the analog electrical signal in power line transmission by processing, use
In expression uplink communication data.Above-mentioned preferred scheme can further improve the scalability of the system, be easy to user terminal to connect
Enter communication network.
Fig. 2 shows the specific connection diagram of the system, as shown in Fig. 2 the communication system of the present embodiment can also be wrapped
Include：First coupler 21 and the second coupler 22, the headend 12 pass through the cable 25 of the first coupler 21 and first
First end connection, the trunking 13 is connected by second coupler 22 with the second end of first cable 25.
It can also include：3rd coupler 23 and the 4th coupler 24, the trunking 13 pass through the described 3rd coupling
Device 23 is connected with the first end of the second cable 26, and the terminal device 14 passes through the 4th coupler 24 and second cable
26 the second end connection.
Specifically, coupler is generally separately mounted to the two ends of a cable, its act on be signal coupling and high pressure every
From transmitting carrier signal between power transmission cable and communication equipment by coupling, coupler is in original cable
Installed on road, it is not necessary to change circuit, will not also destroy circuit.
Above-mentioned coupler can be inductive coupler or capacity coupler.Inductive coupler typically makes on cable run
With inductive coupler is directly connected in a certain phase of midium voltage cable, passes through inductive coupler and cable connection, it can be ensured that signal
Do not produce distortion in working band, and reduce mismatch attenuation in maximum frequency range, make the loss of signal of coupler most
It is small；Also, inductive coupler can be worked under high current intensity with long-time stable, inductive coupler have it is easy for installation, absolutely
Edge is good, is not contacted directly with cable, safe, the advantages of price economy
Capacity coupler is typically used on overhead transmission line, and capacity coupler uses injection mode and a certain phase of overhead transmission line
Connection, and be fixed on overhead transmission line cable bar.Substantially, capacity coupler has waterproof and dustproof to capacity coupler security advantages
Structure, and capacity coupler upper part is equipped with 10KV Zinc-Oxide Arresters, when along the incoming lightning impulse of overhead transmission line
When ripple exceedes protection of arrester level, arrester discharges first, and the introducing the earth by electric current by ground connection good conductor safety, profit
Lightning voltage amplitude is limited in protected scope with earthing or grounding means, it is to avoid equipment is destroyed, it is ensured that communication it is normal
Operation.Capacity coupler installation process is simple, convenient, fast, mainly solid comprising middle pressure rack ceases to be busy, capacity coupler is connected to
It is fixed and from fixation with ground.
Preferably, first cable 25 is the power transmission cable between the first switching station 27 and the second switching station 28, described
The first end of one cable 25 is the leading-out terminal of the ring main unit in first switching station 27, and the second end of first cable 25 is
The end of incoming cables of ring main unit in second switching station 28；
Second cable 26 is the power transmission cable between switching station 29 of second switching station 28 and the 3rd, second electricity
The first end of cable 26 is the leading-out terminal of the ring main unit in second switching station 28, and the second end of second cable 26 is described
The end of incoming cables of ring main unit in 3rd switching station 29.
Switching station is for receiving electric power and distributing the power supply and distribution facility of electric power, switchyard is referred to as in high-voltage fence.Middle pressure
Switching station in power network is generally used for the receiving and distribution of 10kV electric power.Divided again provided with medium-voltage distribution inlet-outlet line, to power
The power distribution equipment matched somebody with somebody.Equivalent to the extension of substation bus bar, available for solving, transformer station's inlet-outlet line interval is limited or inlet-outlet line is walked
Corridor is limited, and plays a part of power supply support in the zone, and medium voltage switchyard can be built jointly with switchgear house if necessary.
As it was noted above, carrier signal is substantially a kind of electromagnetic signal, if carrier signal is direct in transmitting procedure
Through switching station, the quality of signal will necessarily be had influence on by certain interference.In order to avoid switching station is to signal quality
Influence, the coupler in the system can be configured according to above-mentioned preferred scheme, make carrier signal across on transmission line
Switching station, to improve the quality of carrier signal.
The modulation system of carrier signal has a variety of, headend 12, terminal device 14 and trunking in the present embodiment
13 using OFDM modulation systems generation carrier signals, and determine according to the transmission quality of carrier signal the work of the carrier signal
Frequency.The operating frequency range can be 2-34MHz.OFDM modulation systems are a kind of multi-carrier modulation, this mode
One carrier wave can be divided into the subcarrier of many narrower bandwidths in certain frequency range, these subcarriers are mutually just
Hand over, encoded these subcarrier signals using FFT.Subcarrier frequency demultiplexer inverts signal, is allowed to just
Hand over, for n subcarrier, the character rate of each subcarrier is divided into the 1/n of whole character rate by carrier modulator, and this makes
Character rate is longer than multidiameter to reduce intersymbol interference after must modulating.OFDM technologies mainly have the advantage that：1）Effectively
Overcome intersymbol interference, strong antijamming capability；2）Band efficiency is high；3）The equilibrium of system is simple etc..Above-mentioned carrier equipment（Head end
Equipment, trunking, terminal device）It can be carried according to the change of real-Time Signal Transfer quality selection using all or part of son
Ripple, and the modulation system of subcarrier can be adjusted flexibly.
The operating frequency range of broadband carrier signal can be 2-34MHz.OFDM technology is by frequency selective fading channels
Substantial amounts of flat fading subchannel is divided into, therefore frequency selective fading can be effective against.Son letter in ofdm system
Road narrow bandwidth, adjacent sub-channel need not be distributed on continuous frequency band, and ofdm system is effective against on power line channel
Interference and decline.On power line channel, interference generally occurs on a certain frequency, that is, interference can influence one or several
Subchannel.When the decline on certain sub-channels is serious, when signal to noise ratio is less than given thresholding, OFDM can adaptively close the son
Channel, does not send data in the subchannel, to ensure the integrality and the relatively low bit error rate of data.Same method can also
For resisting channel disturbance.When disturb it is very big, when having a strong impact on certain sub-channels, can same method may also be used for confrontation letter
Disturb in road.It is very big when disturbing, when having a strong impact on certain sub-channels, the subchannel can be closed to avoid big error in data, or
Person can improve signal to noise ratio by the transmission power of signal in the larger subchannel of raising interference, ensure that data are correctly transmitted.
Preferably, the load that the trunking 13 and the terminal device 14 can also be sent according to the headend 12
The frequency of ripple signal determines its own signal transmission frequency.Specifically, can be from the headend 12 to institute in communication process
State trunking 13 and terminal device 14 sends training data, the trunking 13 and terminal device 14 are used for according to the instruction
Practice data and determine the working frequency of itself.Above-mentioned preferred scheme can be headend 12, trunking 13 and terminal device 14
Work on the same frequencies, so as to improve the transmission quality of carrier signal.
[1]
Embodiment 2
The present embodiment provides a kind of communication means, as shown in figure 3, this method includes：
S1, device of optical network unit receives the optical signal that optical line terminal is sent, and is converted into data signal, to head
End equipment sends data signal；The optical line terminal（OLT, optical line terminal）The optical signal of transmission can be with
It is the downlink communication data of the use light wave morphology sent with broadcast mode, after conversion, device of optical network unit can be sent
Meet the data signal of the standards of IEEE 802.3, for representing downlink communication data.
S2, the headend receives data signal, and is converted into carrier signal, and carrier wave letter is sent to trunking
Number；The headend is connected by netting twine with the device of optical network unit, and headend can be provided with carrier signal
The equipment for managing chip, such as electric power modem, it is by the above-mentioned data signal warp for meeting the standards of IEEE 802.3 that it, which is acted on,
Cross processing to be converted into being adapted to the analog electrical signal in power line transmission, for representing downlink communication data.Specifically, Ji Jiangtou
End equipment port receives the data signal for meeting IEEE802.3 standards come by encryption, coding, modulation treatment, is converted to
It is adapted to the carrier wave analog signal transmitted in power cable.
S3, the trunking receives the carrier signal that the headend is sent, and carries out gain to it, is set to terminal
Preparation send the carrier signal after gain；Trunking can be connected by cable with the headend, due to carrier signal sheet
It is a kind of electromagnetic signal in matter, so itself can decay with the increase of transmission range.Trunking can be provided with
The equipment of gain process chip, such as electric power modem, it can carry out signal gain to carrier signal, make up signal and exist
Cable middle and long distance transmission signal attenuation, make up loss.
S4, the terminal device receives the carrier signal after the gain that the trunking is sent, and is converted into number
Word signal, data signal is sent to the first user terminal, and terminal device can be connected by cable with the trunking.Terminal
Equipment can be provided with the equipment of carrier signal process chip, such as electric power modem, and its effect is to believe above-mentioned carrier wave
Number the data signal that is adapted to transmit in netting twine is converted into by processing, for representing downlink communication data.Specifically, i.e., to this
The carrier signal that device port reception comes is demodulated, decryption processing, is converted to the numeral letter for meeting IEEE802.3 standards
Number, it is then sent to the first user terminal 15 complete the transmission process of downlink data.
S5, the terminal device receives the data signal that first user terminal is sent, and is converted into carrier wave letter
Number, send carrier signal to the trunking；Terminal device can meet IEEE 802.3 by what the first user terminal was sent
The data signal of standard is converted into being adapted to the analog electrical signal in power line transmission by processing, for representing uplink communication number
According to.Specifically, i.e., slave unit port is received to the data signal for meeting IEEE802.3 standards come by encryption, coding, tune
System processing, is converted to the carrier wave analog signal for being adapted to transmit in power cable.
S6, the trunking receives the carrier signal that the terminal device is sent, and carries out gain to it, to the head
End equipment sends the carrier signal after gain；Signal gain is carried out to carrier signal, signal is made up and passes over long distances in the cable
Defeated signal attenuation, make up loss.
S7, the headend receives the carrier signal after the gain that the trunking is sent, and is converted into number
Word signal, data signal is sent to the optical network unit；Carrier signal can be converted into being adapted to by headend by processing
The data signal transmitted in netting twine, for representing uplink communication data.Specifically, i.e., the load come is received to the device port
Ripple signal is demodulated, decryption processing, is converted to the data signal for meeting IEEE802.3 standards.
S8, the device of optical network unit receives the data signal that the headend is sent, and is converted into light letter
Number, optical signal is sent to the optical line terminal, i.e., is sent to OLT in the uplink communication data using light as transmission medium, completion
The transmission process of row data.
The communication means provided according to the utility model, can be docked by device of optical network unit with optical line terminal,
Receive the downlink data sent with form of light waves and send data signal, data signal is then received by headend, and will
It is converted to the carrier signal that can be transmitted in the cable, while gain is carried out to the carrier signal by trunking, with more
The loss in transmitting procedure is mended, above-mentioned carrier signal is received eventually through terminal device 14, and be converted into data signal hair
User terminal is delivered to, to complete downlink communication process；And the data signal that user terminal is sent can be received by terminal device
The carrier signal that can be transmitted in the cable is converted into, gain is carried out to the carrier signal by trunking, to make up
Loss in transmitting procedure, then by the carrier signal after headend gain acceptance in, and is converted into data signal, most
The data signal is received by device of optical network unit eventually, and is converted into the optical signal for being adapted to transmit in a fiber and is sent
To optical line terminal, to complete uplink communication process.This method can realize the mixed networking of fiber optic communication and carrier communication, by
This can reduce laying for optical fiber on communication line, and then reduce communication line construction working, reduce communications cost.
This method is particularly suitable for use in power distribution automation transformation process not reserving communication pipe or communication pipe is obstructed
Region（Because pipeline is obstructed etc. caused by the reasons such as surface subsidence, other pipeline constructions）Although such region can not lay light
Fibre, but cable run is provided with mostly.In this case end can be reached in optical fiber and sets up the above-mentioned He of device of optical network unit 11
Headend 12, sets up bandwidth carrier terminal/trunking 13, you can complete the obstructed point of optical fiber in obstructed position of local optical fiber
Communication network to main website platform is set up, and is P2P（Point-to-point mode）Or P2MP（Point-to-multipoint mode）.The system
Any construction need not be carried out on communication line, only need to can be complete after installation and debugging the said equipment on existing communication line
Into the construction of power distribution communication net.
Due to trunking position may also it is in need send upstream data user terminal, so the present embodiment institute
Method is stated during downlink communication, is also included after the trunking receives carrier signal：
Carrier signal is converted to data signal by S9, trunking, and data signal is sent to second user terminal；
The present embodiment methods described can also include during uplink communication：
S10, trunking receives the data signal that second user terminal is sent, and is converted into carrier signal, to institute
State headend and send carrier signal.
Trunking can also be provided with carrier signal process chip, its carrier signal that can be sent to headend port
Be demodulated, decryption processing, be converted to the data signal for meeting IEEE802.3 standards, be then sent to whole to second user
End completes the transmission process of downlink data；Second user terminal can also be sent meets the numeral letter of the standards of IEEE 802.3
Number it is converted into being adapted to the analog electrical signal in power line transmission by processing, for representing uplink communication data.It is above-mentioned preferred
Scheme can further improve the scalability of the system, be easy to user terminal access to communication networks.
This method can transmit above-mentioned carrier signal using the coupling of coupler, and coupler is generally separately mounted to one
The two ends of root cable, its effect is coupling and the high_voltage isolation of signal, i.e., by coupling between carrier equipment and cable
Carrier signal is transmitted, coupler is installed on original cable run, it is not necessary to change circuit, also will not failure line
Road.
Specifically, above-mentioned S3 can include：
The carrier signal that the headend is sent is coupled in the first cable by S31, the first coupler；
Carrier signal in first cable is coupled in the trunking by S32, the second coupler.
Above-mentioned S4 can include：
S41, the carrier signal after the gain that the 3rd coupler sends the trunking is coupled in the second cable；
Carrier signal after gain in second cable is coupled in the terminal device by S42, the 4th coupler.
Above-mentioned S6 can include：
The carrier signal that the terminal device is sent is coupled in second cable by S61, the 4th coupler；
Carrier signal in second cable is coupled in the trunking by S62, the 3rd coupler.
Above-mentioned S7 can include：
S71, the carrier signal after the gain that second coupler sends the trunking is coupled to described first
In cable；
Carrier signal after gain in first cable is coupled to the head end and set by S72, first coupler
In standby.
Above-mentioned coupler can be inductive coupler or capacity coupler, and inductive coupler typically makes on cable run
With inductive coupler is directly connected in a certain phase of midium voltage cable, passes through inductive coupler and cable connection, it can be ensured that signal
Do not produce distortion in working band, and reduce mismatch attenuation in maximum frequency range, make the loss of signal of coupler most
It is small；Also, inductive coupler can be worked under high current intensity with long-time stable, inductive coupler have it is easy for installation, absolutely
Edge is good, is not contacted directly with cable, safe, the advantages of price economy
Capacity coupler is typically used on overhead transmission line, and capacity coupler uses injection mode and a certain phase of overhead transmission line
Connection, and be fixed on overhead transmission line cable bar.Substantially, capacity coupler has waterproof and dustproof to capacity coupler security advantages
Structure, and capacity coupler upper part is equipped with 10KV Zinc-Oxide Arresters, when along the incoming lightning impulse of overhead transmission line
When ripple exceedes protection of arrester level, arrester discharges first, and the introducing the earth by electric current by ground connection good conductor safety, profit
Lightning voltage amplitude is limited in protected scope with earthing or grounding means, it is to avoid equipment is destroyed, it is ensured that communication it is normal
Operation.Capacity coupler installation process is simple, convenient, fast, mainly solid comprising middle pressure rack ceases to be busy, capacity coupler is connected to
It is fixed and from fixation with ground.
Preferably, first cable is the power transmission cable between the first switching station and the second switching station, second cable
It is the power transmission cable between second switching station and the 3rd switching station.
Switching station is for receiving electric power and distributing the power supply and distribution facility of electric power, switchyard is referred to as in high-voltage fence.Middle pressure
Switching station in power network is generally used for the receiving and distribution of 10kV electric power.Divided again provided with medium-voltage distribution inlet-outlet line, to power
The power distribution equipment matched somebody with somebody.Equivalent to the extension of substation bus bar, available for solving, transformer station's inlet-outlet line interval is limited or inlet-outlet line is walked
Corridor is limited, and plays a part of power supply support in the zone, and medium voltage switchyard can be built jointly with switchgear house if necessary.
As it was noted above, carrier signal is substantially a kind of electromagnetic signal, if carrier signal is direct in transmitting procedure
Through switching station, the quality of signal will necessarily be had influence on by certain interference.In order to avoid switching station is to signal quality
Influence, the coupler in the system can be configured according to above-mentioned preferred scheme, make carrier signal across on transmission line
Switching station, to improve the quality of carrier signal.
The modulation system of carrier signal has a variety of, and the headend, trunking and terminal device in the present embodiment are preferred
Using OFDM modulation systems generation processing communication data, and determine according to the transmission quality of the communication data work of equipment itself
Working frequency.
OFDM modulation systems are a kind of multi-carrier modulations, and this mode can be in certain frequency range by one
Carrier wave is divided into the subcarrier of many narrower bandwidths, and these subcarriers are mutually orthogonal, using FFT by these times
Carrier signal is encoded.Subcarrier frequency demultiplexer inverts signal, is allowed to orthogonal, for n subcarrier, each subcarrier
Character rate is divided into the 1/n of whole character rate by carrier modulator, this cause modulation after character rate be longer than multidiameter from
And reduce intersymbol interference.OFDM technologies mainly have the advantage that：1）Effectively overcome intersymbol interference, strong antijamming capability；2）Frequently
Band utilization rate is high；3）The equilibrium of system is simple etc..
The operating frequency range of broadband carrier signal can be 2-34MHz.OFDM technology is by frequency selective fading channels
Substantial amounts of flat fading subchannel is divided into, therefore frequency selective fading can be effective against.Son letter in ofdm system
Road narrow bandwidth, adjacent sub-channel need not be distributed on continuous frequency band, and ofdm system is effective against on power line channel
Interference and decline.On power line channel, interference generally occurs on a certain frequency, that is, interference can influence one or several
Subchannel.When the decline on certain sub-channels is serious, when signal to noise ratio is less than given thresholding, OFDM can adaptively close the son
Channel, does not send data in the subchannel, to ensure the integrality and the relatively low bit error rate of data.Same method can also
For resisting channel disturbance.When disturb it is very big, when having a strong impact on certain sub-channels, can same method may also be used for confrontation letter
Disturb in road.It is very big when disturbing, when having a strong impact on certain sub-channels, the subchannel can be closed to avoid big error in data, or
Person can improve signal to noise ratio by the transmission power of signal in the larger subchannel of raising interference, ensure that data are correctly transmitted.
Preferably, the carrier signal that the trunking and the terminal device can also be sent according to the headend
Frequency determine its own signal transmission frequency.
Specifically, in communication process, the headend can send training data to trunking and terminal device；
The trunking and terminal device determine the working frequency of itself according to the training data.Above-mentioned preferred scheme can be head
End equipment, trunking and terminal device work on the same frequencies, so as to improve the transmission quality of carrier signal.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (8)
1. a kind of communication system, it is characterised in that including：Device of optical network unit, headend, trunking and terminal are set
Standby, device of optical network unit is connected by netting twine with headend, and headend is connected by cable with trunking, and relaying is set
It is standby to be connected by cable with terminal device；
Wherein, device of optical network unit includes the first downstream signal processing unit and the first upward signal processing unit, described the
One descending signal processing unit is used for the optical signal for receiving optical line terminal transmission, and is converted into data signal, head-end
Equipment sends data signal；The first upward signal processing unit is used for the data signal for receiving headend transmission, and will
It is converted to optical signal, and optical signal is sent to optical line terminal；
Headend is included at the second downstream signal processing unit and the second upward signal processing unit, second downstream signal
Reason unit is used for the data signal for receiving optical network unit transmission, and is changed to carrier signal, and carrier wave is sent to trunking
Signal；Second upward signal processing unit is used to receive the carrier signal after the gain of trunking transmission, and is converted into
Data signal, data signal is sent to optical network unit；
Trunking includes gain unit, and the gain unit is used for the carrier signal for receiving headend transmission, and it is entered
Row gain, the carrier signal after gain is sent to terminal device；The carrier signal of receiving terminal apparatus transmission is additionally operable to, and to it
Gain is carried out, head-end equipment sends the carrier signal after gain；
Terminal device is included at the 4th downstream signal processing unit and the 4th upward signal processing unit, the 4th downstream signal
Reason unit is used to receive the carrier signal after the gain of trunking transmission, and is converted into data signal, to the first user
Terminal sends data signal；4th upward signal processing unit is used to receive the data signal that the first user terminal is sent, and will
It is converted to carrier signal, and carrier signal is sent to trunking.
2. system according to claim 1, it is characterised in that the trunking also includes the 3rd downstream signal and handles single
Member and the 3rd upward signal processing unit, wherein the 3rd downstream signal processing unit is used to receive the headend transmission
Carrier signal, the carrier signal is converted into data signal, and send to second user terminal；3rd upward signal
Processing unit is used to receive the data signal that the second user terminal is sent, and is converted into carrier signal, to the head
End equipment sends the carrier signal.
3. system according to claim 1 or 2, it is characterised in that also include：First coupler and the second coupler, institute
State headend to be connected with the first end of the first cable by first coupler, the trunking passes through second coupling
Clutch is connected with the second end of first cable.
4. system according to claim 3, it is characterised in that also include：Also include：3rd coupler and the 4th coupling
Device, the trunking is connected by the 3rd coupler with the first end of the second cable, and the terminal device passes through described
4th coupler is connected with the second end of second cable.
5. system according to claim 4, it is characterised in that first cable is the first switching station and the second switching station
Between power transmission cable, the first end of first cable is the leading-out terminal of the ring main unit in first switching station, described first
Second end of cable is the end of incoming cables of the ring main unit in second switching station；
Second cable is the power transmission cable between second switching station and the 3rd switching station, the first end of second cable
It is the leading-out terminal of the ring main unit in second switching station, the second end of second cable is the ring in the 3rd switching station
The end of incoming cables of net cabinet.
6. system according to claim 1, it is characterised in that the headend, terminal device and trunking are used
OFDM modulation systems generate carrier signal, and determine according to the transmission quality of carrier signal the working frequency of the carrier signal.
7. system according to claim 1, it is characterised in that the trunking and the terminal device are additionally operable to basis
The frequency for the carrier signal that the headend is sent determines its own signal transmission frequency.
8. system according to claim 7, it is characterised in that the headend is used for the trunking and terminal
Equipment sends training data, and the trunking and terminal device are used to determine the work frequency of itself according to the training data
Rate.
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| CN201621036988.8U CN206402232U (en) | 2016-09-05 | 2016-09-05 | A kind of communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106130642A (en) * | 2016-09-05 | 2016-11-16 | 国网辽宁省电力有限公司大连供电公司 | A kind of communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130642A (en) * | 2016-09-05 | 2016-11-16 | 国网辽宁省电力有限公司大连供电公司 | A kind of communication system |
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