CN1859585B - Broad band user cut-in processing method and device and user interface board - Google Patents
Broad band user cut-in processing method and device and user interface board Download PDFInfo
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Abstract
A broadband subscriber access equipment user board includes motherboard interface module, uplink and downlink channel connected with motherboard interface module, wherein downlink channel including digital modulation demodulation device, modulating filter circuit, electric light conversion module, uplink channel including photoelectric conversion module, demodulation filter circuit, digital modulation demodulation device. The present invention also provides broadband subscriber access equipment using above-mentioned user board and method.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of broad band user cut-in processing method and equipment and user board.
Background technology
XDSL is a kind of in twisted pair telephone (unshielded twisted pair, Unshielded Twist Pair, UTP) Chuan Shu high speed data transfer technology, except the DSL (digital subscriber line) of IDSL (ISDN Digital Subscriber Loop) and SHDSL baseband transmission such as (single pair high bit rate digital subscriber loop roads), the xDSL of passband transmission utilizes frequency multiplexing technique to make xDSL and Plain Old Telephone Service (POTS) coexist as with on a pair of twisted-pair feeder, wherein xDSL occupies high band, POTS (Plain Old Telephone Service) takies the following baseband portion of 4KHz, and the POTS signal separates by separator with the xDSL signal.The xDSL of passband transmission adopts Discrete multi-tone modulation (DMT).The system that provides multichannel xDSL to insert is called DSL couple in multiplexer (DSLAM), and its system reference model as shown in Figure 1.
Because xDSL transmits on unshielded twisted pair UTP, and UTP is originally to the transporting speech Design of Signal, so high frequency characteristics is bad, and is very big for the xDSL signal attenuation that occupies high-end frequency, restricted the coverage of xDSL business.The access rate that provides in the actual application is high more, its coverage is just more little, can provide the speed of the highest 25Mbit/s such as ADSL2+ (downlink bandwidth expansion ADSL2) in short distance, and the access rate at 6 kilometers places is lower than 1Mbps, VDSL2 (ADSL (Asymmetric Digital Subscriber Line) of the second generation) is because mainly towards the high bandwidth business, and therefore main coverage is less than 1.5 kilometers (are example with 0.4mm line footpath cable, down with), downstream rate above 40M is provided, and distance must be less than 1000 meters.But be lower than half of total number of users the user that most countries satisfies this requirement, for the user who surpasses above-mentioned scope for a lot of distances from the phone office point provides the high bandwidth access service, operator adopts the method that the office point is moved down near the user to shorten line length, be illustrated in figure 2 as DSLAM by fiber optic stretch, the access way of Here it is so-called FTTx (general name that optical fiber inserts)+xDSL, being placed on far-end links by optical fiber on the poly-convergence device of data of local central machine room from the DSLAM of user distance less than 1km, this mode can solve distance problem, but because the office point number increases and disperses, power supply inconvenience, operation expense is very high.
The trend of broadband access is that light advances copper and moves back, that is to say optical fiber more and more near the user, the copper cash distance is shorter and shorter, but realizes that Fiber to the home, also there is the problem on the cost in fiber to the desk, and therefore the final stage of Access Network remains xDSL in considerable time.
Miu Si plan (the MUSE Project that provides with funds and support by European Union, Multi Service AccessEverywhere) framework and the technology of concern multiple service access network, among the sub-project Optical Access wherein (optical fiber access) some interesting technology have been proposed, such as DSL over Optic, transmit the DSL signal by optical fiber exactly, its concrete grammar is exactly with the technology of multichannel xDSL signal by channeling, linear modulation is transmitted on light intensity, conciliate the signal that multiplex technique recovers xDSL in the opposite end by linear demodulation, because the decay of optical fiber is very little, therefore by this method can be with the coverage extension to tens of xDSL kilometer, and because this modulation, the equipment of multiplexing and demultiplexing can solidify, need not software upgrading and maintenance, therefore can make non-maintaining closed equipment, be placed on node place, be the networking schematic diagram of the DSL over Optic in the MUSE project as shown in Figure 3 near the user.
Be illustrated in figure 4 as frequency translation and principle of multiplexing schematic diagram, frequency translation and multiplexing modulation and the multiplex process that is similar among the CATV (cable TV), frequency translation is that each user's xDSL (taking identical frequency band) is modulated on the carrier wave of prior appointment, each user's centre carrier frequency difference, signal through each user after the frequency translation is separated on frequency like this, arrive together by the signal multiplexing of mixer then, form the signal of one road frequency division multiplexing above-mentioned frequency division.Separate the process of frequency translation and demultiplexing and above-mentioned just in time opposite, the signal that is modulated at high frequency carrier is reverted to one tunnel xDSL signal that takies same frequency band.
Be illustrated in figure 5 as the network work principle schematic of MUSE project, the solution of MUSE project is the analog signal process frequency translation and multiplexing with the output of xDSL modulator-demodulator, again by the method for optical device with the linear light modulation, arrive node by Optical Fiber Transmission, pass through demultiplexing again, separate and move, the analog signal that recovers xDSL is transferred to user house by twisted-pair feeder.
In the ustomer premises access equipment ONU of Fig. 5 (optical network unit) side, light branch/wave multiplexer send linear light-electric modular converter to become the signal of telecommunication downlink optical signal, amplify through splitter again and be assigned to a plurality of demodulator demodulation, just remove frequency translation, the xDSL signal that is restored, through carrying out power amplification behind the low pass filter, through two, wire/four-wire converting circuit sends on the circuit; The upward signal that data feedback channel receives through two, wire/four-wire converting circuit is separated is through sending on the optical fiber through multiplexer-demultiplexer after amplification, modulation, bandpass filtering, He Lu, the electrical-optical conversion.
In the local side apparatus side of Fig. 5, comprise and carry out DSL over Optic frequency translation and multiplexing equipment OLT (optical line terminal) and DSLAM (Digital Subscriber Line Access Multiplexer).DSLAM and OLT branch are opened, and the centre connects with twisted-pair feeder.
Be illustrated in figure 6 as the frame structure schematic diagram of DSLAM system, a common DSLAM is by forming with the lower part of linking to each other by motherboard bus: the control board of managing whole DSLAM system, the uplink interface board and a series of user board that provide upstream data to converge interface, mainly be the xDSL user board wherein, and the xDSL user board mainly is made up of motherboard interface, xDSL digital modulation and demodulation module and control, power supply.
XDSL digital modulation and demodulation module is responsible for the modulation of xDSL signal, is made up of xDSL chipset and peripheral circuit usually, comprises that DSP (digital signal processor), AFE (AFE (analog front end)) finish conversion and voltage amplification between the analog and digital signal; Line driver receives the next transmission signal of AFE and finishes the power amplification that sends signal; Reception amplifier is put into and delivers to AFE to received signal, and therefore integrated reception amplifier in the AFE does not need outside reception amplifier usually; Hybrid circuit (AFE (analog front end) hybrid circuit) is finished outside line (2) and inner two, the four line conversion that receive and send between (each two), realize sending the separation between signal, the received signal, the hybrid circuit is made of capacitance resistance ware and transformer usually.In fact a pair of DSP and AFE generally can support multichannel xDSL modulation, just signal of a pair of DSP in every road and AFE among Fig. 6.
Because dividing, OLT and DSLAM open, the centre connects with twisted-pair feeder, the 2-4 line conversion that receives and send signal need be finished in the xDSL interface section of DSLAM, and owing to the separating treatment that also needs to send among the OLT between signal, the received signal, therefore also will carry out the conversion of a 2-4 line in OLT.
The shortcoming of prior art is: the DSLAM of such scheme opens with frequency translation that carries out DSL over Optic and multiplexing OLT branch, the centre connects with twisted-pair feeder, the 2-4 line conversion that receives and send signal need be finished in the xDSL interface section of DSLAM, in OLT, also to carry out the conversion of a 2-4 line, these all are redundant in fact, bring the increase of cost and density to descend.
Summary of the invention
Technical problem to be solved by this invention is: overcome in the prior art local side apparatus OLT and DSLAM and divide and open, need to finish the 2-4 line conversion that receives and send signal among DSLAM and the OLT respectively, bring the shortcoming that cost increases and density descends, a kind of broad band user cut-in processing method and equipment and user board are provided, reduce cost, promote port density.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of broadband user's access device user board comprises the motherboard interface module, also comprises at least one road uplink and downlink passage that is connected with described motherboard interface module, wherein:
Described down going channel comprises the digital modulation and demodulation device that is linked in sequence, modulated filter circuit, mixer and electrooptic conversion module at least, to be transferred to from the signal that the motherboard interface module receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises the photoelectric conversion module that is linked in sequence, splitter, demodulation filter circuit and digital modulation and demodulation device at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by described motherboard interface module.
Wherein, described photoelectric conversion module and electrooptic conversion module are two separate devices or are integrated in the same module.
Wherein, described data feedback channel and down going channel adopt respectively independently that optical fiber is connected to user side, perhaps the shared optical fiber of data feedback channel and down going channel.
Described data feedback channel and down going channel can be realized the shared optical fiber of up-downgoing by closing ripple/channel-splitting filter.
Wherein, can be provided with mixer between the modulated filter circuit of described down going channel and the electrooptic conversion module, mixer merges multiple signals, and the signal after will merging is delivered to electrooptic conversion module and handled; Be provided with splitter between the demodulation filter circuit of described data feedback channel and the photoelectric conversion module, splitter is assigned to the demodulation filter circuit with the multichannel mixed signal of receiving and handles, perhaps behind the photoelectric conversion module of described data feedback channel the multichannel demodulator is set, with the demodulation part and the merging of described splitter functionality of described demodulation filter circuit.
Wherein, described broadband user's access device is a Digital Subscriber Line Access Multiplexer.
Wherein, described digital modulation and demodulation device is the Digital Subscriber Line modulation-demodulation device.
Corresponding a kind of broadband user's access device comprises control section and upstream Interface part, also comprises at least one road uplink and downlink passage, wherein:
Described down going channel comprises digital modulation and demodulation device, modulated filter circuit mixer and the electrooptic conversion module that is linked in sequence at least, to be transferred to from the signal that described upstream Interface receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises photoelectric conversion module, splitter, demodulation filter circuit and the digital modulation and demodulation device that is linked in sequence at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by upstream Interface.
Wherein, the conversion of described opto-electronic conversion and electric light is two separate devices or is integrated in the same module.
Wherein, described data feedback channel and down going channel adopt respectively independently that optical fiber is connected to user side, perhaps the shared optical fiber of uplink and downlink.
Wherein, be provided with mixer between the modulated filter circuit of described down going channel and the electrooptic conversion module, mixer merges multiple signals, and the signal after will merging is delivered to electrooptic conversion module and handled; Be provided with splitter between the demodulation filter circuit of described data feedback channel and the photoelectric conversion module, splitter is assigned to the demodulation filter circuit with the multichannel mixed signal of receiving and handles, perhaps behind the photoelectric conversion module of described data feedback channel the multichannel demodulator is set, with the demodulation part and the merging of described splitter functionality of described demodulation filter circuit.
Wherein, described broadband user's access device is a Digital Subscriber Line Access Multiplexer.
Wherein, described digital modulation and demodulation device is the Digital Subscriber Line modulation-demodulation device.
Corresponding a kind of broadband user's access device comprises motherboard, the user board on the motherboard, and described user board comprises the motherboard interface module, also comprises at least one road uplink and downlink passage that is connected with described motherboard interface module, wherein:
Described down going channel comprises digital modulation and demodulation device, modulated filter circuit, mixer and the electrooptic conversion module that is linked in sequence at least, to be transferred to from the signal that the motherboard interface module receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises photoelectric conversion module, splitter, demodulation filter circuit and the digital modulation and demodulation device that is linked in sequence at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by described motherboard interface module.
Corresponding a kind of broad band user cut-in processing method adopts optical fiber to come the transmission of digital subscriber line signal between user side and local side, at local side the uplink and downlink data is handled respectively, and step comprises:
When descending, adopt the signal after the modulated filter circuit is handled the digital modulation demodulating equipment to carry out modulated filter, carry out frequency division multiplexing by mixer to modulating filtered signal, and the conversion of signals that will be taken in small doses at short intervals after multiplexing by electrooptic conversion module is that light signal sends to Optical Fiber Transmission to user side;
When up, behind optical fiber reception user side signal, be the signal of telecommunication with the conversion of signals that optical fiber receives, after demultiplexer separates, send to demodulation aluminium foil circuit and carry out demodulation filtering, handle by the digital modulation and demodulation device then by photoelectric conversion module.
Wherein, described modulation is that the signal after being handled by the digital modulation and demodulation device is carried out frequency translation, signal after then channelized frequencies being moved carries out frequency division multiplexing, and described demodulation is to be input to described digital modulation and demodulation device after multiple signals are separated frequency division multiplexing and gone to move.
Wherein, do not adopt an optical fiber to be connected to user side at data uplink and downlink time division; Perhaps when upstream or downstream, will separate or merge, make the shared optical fiber of uplink and downlink light from light signal or the local light signal that sends that circuit receives.
Wherein, each road downlink data merges after modulated filter, and the conversion of signals after will merging again is a light signal; Upstream data carries out shunt after being converted to the signal of telecommunication, carry out the demodulation Filtering Processing more respectively, and perhaps upstream data is concentrated after being converted to the signal of telecommunication and carried out demodulation, sends to each road more respectively and carries out Filtering Processing.
Wherein, single-side band modulation, vestigial sideband modulation or double-sideband modulation are adopted in described modulation.
Beneficial effect of the present invention is: the present invention by the frequency translation of modulator-demodulator and OLT/separate is moved, multiplex/demultiplex is partly integrated is in the same place, remove 2-4 line conversion fraction wherein, a kind of broad band user cut-in processing method, broadband user's access device and broadband user's access device user board are provided, have reduced cost, promoted port density.Concrete advantage comprises:
1, provide a kind of over distance xDSL access solution, owing to adopt analog-modulated and transmission, the capacity of optical fiber is fully used.With respect to two DSL over Fiber systems of forming of DSLAM module and optical fiber modulation multiplex module independently, port density height;
2, the present invention can provide higher density, owing to removed circuit drive part, analog hybrid, transformer and high-voltage capacitance and the required power supply of line driver, the outlet scheme of DSLAM has also been simplified in the optical fiber outlet greatly, the twisted-pair feeder outlet of DSLAM is a great problem that hinders the Single Cabinet port density always, uses the present invention fundamentally to solve this problem.
3, with respect to the MUSE scheme, cost is lower.Owing to save device, except having saved the PCB area, also greatly reduce cost, original in addition distribution cable cost is also very expensive, and every veneer only needs one or two optical fiber just passable now.
4, power consumption descends, and the power consumption of the line driver of xDSL accounts for 50%～80% of whole power consumption, and the present invention significantly reduces than MUSE scheme power consumption because saved the line driver part.
Description of drawings
Fig. 1 is an XDSL system reference model schematic diagram;
Fig. 2 is the DSLAM networking schematic diagram by fiber optic stretch;
Fig. 3 is the networking schematic diagram of the DSL over Optic in the MUSE project;
Fig. 4 is frequency translation and principle of multiplexing schematic diagram;
Fig. 5 is the network work principle schematic of MUSE project;
Fig. 6 is the frame structure schematic diagram of DSLAM system;
Fig. 7 is the modem section logic diagram of xDSL user board of the present invention;
Fig. 8 is the logic diagram of modem section when the splitter reconciliation is concocted also of xDSL user board of the present invention;
Fig. 9 is the DSLAM structural representation of user board of the present invention;
Figure 10 is the small-sized DSLAM structural representation of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Present embodiment provides a kind of broadband user's interface board, and the broadband access equipment (is that example describes with DSLAM) of using this interface board.As Fig. 7 and shown in Figure 9, be that example describes with the two-way modulator-demodulator among the figure, also can be one or more.
As shown in Figure 9, user board comprises the motherboard interface module, also comprise at least one road uplink and downlink passage that is connected with described motherboard interface module, be illustrated in figure 7 as the modem section logic diagram of xDSL user board, wherein sendaisle (being down going channel again) comprises digital signal processing device (DSP), analog front-end device (AFE), modulated filter circuit, the electrooptic conversion module that is linked in sequence at least, the signal that will receive from the motherboard interface module after treatment by Optical Fiber Transmission to user side; Receive path (calling row of channels again) comprises the photoelectric conversion module, demodulation filter circuit, analog front-end device, the digital signal processing device that the are linked in sequence composition that is linked in sequence at least, after receiving the user side signal, handles optical fiber, and up by described motherboard interface module.DSP and AFE are the digital modulation and demodulation device of XDSL (ADSL or ADSL2/ADSL2+VDSL/VDSL2), and those skilled in the art are easy to expect adopting other XDSL digital modulation and demodulation device to handle certainly.Photoelectric conversion module and electrooptic conversion module are two separate devices or are integrated in the same module.Modulation is that the signal after being handled by the digital modulation and demodulation device is carried out frequency translation, and the signal after then channelized frequencies being moved carries out frequency division multiplexing, and demodulation is to be input to the digital modulation and demodulation device after multiple signals are separated frequency division multiplexing and gone to move.
The analog front-end device of down going channel is between the modulated filter circuit, and the demodulation filter circuit of data feedback channel is to being provided with amplifier (might be integrated in analog front-end device or modulation, the demodulator circuit) between the analog front-end device.
Data feedback channel and down going channel can adopt respectively independently that optical fiber is connected to user side, and then optical multiplexer/demultiplexer does not need; Perhaps user side one side at described data feedback channel and down going channel adopts photosynthetic ripple/channel-splitting filter, photosynthetic ripple/channel-splitting filter connects the electrooptic conversion module of down going channel and the photoelectric conversion module of data feedback channel respectively, to separate or merge from light signal or the local light signal that sends that optical fiber receives, make the shared optical fiber of uplink and downlink.
When two-way being arranged or modulator-demodulator more than the two-way is arranged, between each modulated filter circuit of each down going channel and the electrooptic conversion module mixer is set, mixer merges multiple signals, realizes frequency division multiplexing, and the signal after will merging is delivered to electrooptic conversion module and handled; Between each demodulation filter circuit of each data feedback channel and the photoelectric conversion module splitter is set, splitter is assigned to each demodulation filter circuit with the multichannel mixed signal of receiving and handles.If have only No. one modulator-demodulator, then do not need mixer and splitter.
As shown in Figure 8, also can will issue each xDSL modulation module after the demodulation in each road set of signals more respectively, shunt this moment, demodulation integrate, and adopt the multichannel demodulating equipment, can not need splitter.
As shown in Figure 9, the broadband access equipment DSLAM that uses above-mentioned this interface board comprised by forming with the lower part that motherboard bus links to each other: manage the control board of whole DSLAM system, provide upstream data to converge the uplink interface board of interface and above-mentioned user board.
DSP (digital signal processing device) and AFE (Analog Front End, AFE (analog front end)) are the respective devices in the DSL chipset.Wherein multichannel DSP is connected to motherboard bus by the motherboard interface module, the uplink interface board that links to each other with motherboard will be delivered to after the data demodulates of receiving, otherwise send to optical fiber after will modulating from the data of uplink interface board, photosynthetic ripple/channel-splitting filter is used for the light signal and the local separate optical signals that sends with the circuit reception, uplink and downlink light can a shared optical fiber like this, to save fiber resource.Two optical fiber that can certainly adopt uplink and downlink to separate transmit, and closing ripple/channel-splitting filter has not so just needed.
DSP is the same with existing xDSL chipset with the function of AFE, DSP finishes that sending direction xDSL framing, scrambler, FEC are encoded, interweaved, constellation mapping, trellis coded, IFFT, add Cyclic Prefix and receive direction time domain equalization, remove Cyclic Prefix FFT, frequency domain equalization, Viterbi decoding, separate constellation mapping, deinterleave, the processing of numeric field such as FEC error correction, descrambling code, user data recovery.AFE realizes analog domain signal processing functions such as sending direction steering D/A conversion, filtering, preposition amplification and the amplification of receive direction low-noise programmable, AGC, filtering, analog to digital conversion.DSP and AFE might be integrated the treatment channel of multichannel xDSL.
At sending direction, to the buffer circuit between the modulator, the analog signal that AFE is exported is amplified to suitable amplitude to amplifier, delivers to modulator as AFE.Because the inside of AFE own has buffer circuit, so amplifying circuit is not necessary.The signal that modulator will need to send carries out frequency translation, and signal is modulated onto on the carrier wave of a preset frequency.Can adopt single-side band modulation, vestigial sideband modulation or double-sideband modulation.In order to improve bandwidth availability ratio, adopt single-side band modulation and suppressed carrier, suppressed carrier does not perhaps adopt double-sideband modulation to reduce the complexity of modulation and demodulation module.Double-sideband modulation can directly adopt the envelope detection demodulation, and single-side band modulation needs coherent demodulation, needs to produce and the restituted signal of modulated carrier with the frequency homophase, and is complicated a little.Each road signal all is modulated onto on the different carrier frequency, and the distribution of these carrier frequency is to determine that in advance well, the spacing between per two adjacent carrier frequencies is equal, and more than or equal to the width of modulating the back signal.The signal of above-mentioned multichannel modulation after ovennodulation is sent to the mixer module, and the mixer module merges after above-mentioned multiple signals are cushioned, and will merge the amplitude that the back broadband signal is amplified to light-electric modular converter needs.The optical-electrical converter module receives the above-mentioned signal that closes behind the road, and this conversion of signals is become light signal output, and the intensity of light signal is subjected to closing the amplitude modulation(PAM) of road signal.
At receive direction, close ripple/channel-splitting filter the light signal of receive direction is delivered to photoelectric conversion module, convert the light signal of having modulated information to the signal of telecommunication, deliver to splitter, being assigned to a plurality of demodulators after the signal that splitter mixes the multichannel of receiving amplifies carries out demultiplexing and goes to move, demultiplexing is that the frequency signal with this road correspondence takes out from multiplexed signals, the xDSL signal that is modulated on the high frequency carrier that goes to move this road correspondence moves back to original position (the contrary processing procedure that is equivalent to Fig. 4), the result who handles is that each road xDSL takies the defined frequency band of original xDSL, xDSL signal is along separate routes delivered to corresponding amplifying circuit after leaching high-frequency signal through low-pass filtering, signal amplifier as low pass filter to the buffer circuit between the AFE, be responsible for signal is adjusted to the needed amplitude of AFE, deliver to the DSP demodulation.Because amplifier is arranged in splitter, there is buffer circuit the inside of AFE own, so amplifying circuit is not necessary.Splitter and go to move and might be integrated in one or demodulator and directly multiple signals are demodulated to the multichannel low frequency signal in addition, this moment, splitter can not need yet.
If adopt single-side band modulation or suppressed carrier, then need the phase place sum of fundamental frequencies rate information of each carrier signal is passed to the opposite end, the opposite end utilizes these information to carry out the carrier wave recovery, and the carrier wave after the recovery is used for carrying out coherent demodulation.
As shown in figure 10, the present invention can also be used for small-sized DSLAM (pizza box), small-sized DSLAM normally focuses on all parts of DSLAM on the plate, comprise the control section and the upstream Interface part that are connected with data/address bus with control bus, also comprise at least one road uplink and downlink passage that is connected with data/address bus with control bus, wherein: down going channel is at least by digital signal processing device, analog front-end device, the modulated filter circuit, electrooptic conversion module and the optical fiber composition that is linked in sequence, the signal that will receive from described bus after treatment by Optical Fiber Transmission to user side; Data feedback channel is linked in sequence and is formed by optical fiber, photoelectric conversion module, demodulation filter circuit, analog front-end device, digital signal processing device at least, handles after optical fiber receives the user side signal, and is up by described bus.
The uplink and downlink channel part is identical with structure shown in Figure 7, repeats no more here, equally also can increase amplifier, mixer/splitter, wave multiplexer/channel-splitting filter, adjusts according to concrete environment for use is different.Fig. 9 only shows the situation of two-way, in fact has a lot of roads, and such as 32 the road or 48 the tunnel etc., those skilled in the art can expand it at an easy rate.
Because high frequency modulated of the present invention part is not to link to each other with a pair of line with the xDSL interface section, correspondence links to each other but send and receive respectively, thus neither one from four lines to two lines, the process from two lines to four lines again, so also just do not need the conversion of 2-4 line.Reduce cost like this, improved port density.
Bandpass filtering after the modulation generally must, the low-pass filtering after the demodulation also must, form parts but these parts might lump together with other parts (such as modulation, demodulation).Channel join-splitting device is the situation that is used for the single fiber bi-directional transmission, if two fibre two-way (every optical fiber only is responsible for a direction), then closing ripple/channel-splitting filter can not need.Mixer needs under the situation of multichannel user interface, does not need during single channel.DSL and AFE can be that same DSL and AFE are used in uplink and downlink, also can be that different DSL and AFE chip are used in uplink and downlink, also can be the processing that a DSL and AFE are responsible for multichannel.Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (17)
1. broadband user's access device user board comprises the motherboard interface module, it is characterized in that, also comprises at least one road uplink and downlink passage that is connected with described motherboard interface module, wherein:
Described down going channel comprises digital modulation and demodulation device, modulated filter circuit, mixer and the electrooptic conversion module that is linked in sequence at least, to be transferred to from the signal that the motherboard interface module receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises photoelectric conversion module, splitter, demodulation filter circuit and the digital modulation and demodulation device that is linked in sequence at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by described motherboard interface module.
2. broadband user's access device user board according to claim 1 is characterized in that: described photoelectric conversion module and electrooptic conversion module are two separate devices or are integrated in the same module.
3. broadband user's access device user board according to claim 1 and 2 is characterized in that: described data feedback channel and down going channel adopt respectively independently that optical fiber is connected to user side, perhaps the shared optical fiber of data feedback channel and down going channel.
4. broadband user's access device user board according to claim 3 is characterized in that: described data feedback channel and down going channel are realized the shared optical fiber of up-downgoing by closing ripple/channel-splitting filter.
5. broadband user's access device user board according to claim 3 is characterized in that: described broadband user's access device is a Digital Subscriber Line Access Multiplexer.
6. broadband user's access device user board according to claim 3 is characterized in that: described digital modulation and demodulation device is the Digital Subscriber Line modulation-demodulation device.
7. broadband user's access device comprises control section and upstream Interface part, it is characterized in that, also comprises at least one road uplink and downlink passage, wherein:
Described down going channel comprises digital modulation and demodulation device, modulated filter circuit mixer and the electrooptic conversion module that is linked in sequence at least, to be transferred to from the signal that described upstream Interface receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises photoelectric conversion module, splitter, demodulation filter circuit and the digital modulation and demodulation device that is linked in sequence at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by upstream Interface.
8. broadband user's access device according to claim 7 is characterized in that: described opto-electronic conversion and electric light conversion are two separate devices or are integrated in the same module.
9. according to claim 7 or 8 described broadband user's access devices, it is characterized in that: described data feedback channel and down going channel adopt respectively independently that optical fiber is connected to user side, perhaps the shared optical fiber of uplink and downlink.
10. broadband user's access device according to claim 9 is characterized in that: described broadband user's access device is a Digital Subscriber Line Access Multiplexer.
11. broadband user's access device according to claim 9 is characterized in that: described digital modulation and demodulation device is the Digital Subscriber Line modulation-demodulation device.
12. broadband user's access device comprises motherboard, the user board on the motherboard is characterized in that, described user board comprises the motherboard interface module, also comprises at least one road uplink and downlink passage that is connected with described motherboard interface module, wherein:
Described down going channel comprises digital modulation and demodulation device, modulated filter circuit, mixer and the electrooptic conversion module that is linked in sequence at least, to be transferred to from the signal that the motherboard interface module receives after described mixer carries out frequency division multiplexing, by the Optical Fiber Transmission that links to each other with electrooptic conversion module to user side;
Described data feedback channel comprises photoelectric conversion module, splitter, demodulation filter circuit and the digital modulation and demodulation device that is linked in sequence at least, perhaps comprise the photoelectric conversion module, multichannel demodulator, low pass filter and the digital modulation and demodulation device that are linked in sequence at least, after receiving the user side signal, handles the optical fiber that links to each other with photoelectric conversion module, and up by described motherboard interface module.
13. a broad band user cut-in processing method is characterized in that: adopt optical fiber to come the transmission of digital subscriber line signal between user side and local side, at local side the uplink and downlink data are handled respectively, step comprises:
When descending, adopt the signal after the modulated filter circuit is handled the digital modulation demodulating equipment to carry out modulated filter, carry out frequency division multiplexing by mixer to modulating filtered signal, and be that light signal sends to Optical Fiber Transmission to user side by the conversion of signals of electrooptic conversion module after with frequency division multiplexing;
When up, behind optical fiber reception user side signal, be the signal of telecommunication with the conversion of signals that optical fiber receives, after demultiplexer separates, send to the demodulation filter circuit and carry out demodulation filtering, handle by the digital modulation and demodulation device then by photoelectric conversion module.
14. broad band user cut-in processing method according to claim 13, it is characterized in that: described modulation is that the signal after being handled by the digital modulation and demodulation device is carried out frequency translation, signal after then channelized frequencies being moved carries out frequency division multiplexing, and described demodulation is to be input to described digital modulation and demodulation device after multiple signals are separated frequency division multiplexing and gone to move.
15., it is characterized in that: do not adopt an optical fiber to be connected to user side at data uplink and downlink time division according to claim 13 or 14 described broad band user cut-in processing methods; Perhaps when upstream or downstream, will separate or merge, make the shared optical fiber of uplink and downlink light from light signal or the local light signal that sends that circuit receives.
16. broad band user cut-in processing method according to claim 15 is characterized in that: each road downlink data merges after modulated filter, and the conversion of signals after will merging again is a light signal; Upstream data carries out shunt after being converted to the signal of telecommunication, carry out the demodulation Filtering Processing more respectively, and perhaps upstream data is concentrated after being converted to the signal of telecommunication and carried out demodulation, sends to each road more respectively and carries out Filtering Processing.
17. broad band user cut-in processing method according to claim 15 is characterized in that: single-side band modulation, vestigial sideband modulation or double-sideband modulation are adopted in described modulation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510121457 CN1859585B (en) | 2005-12-30 | 2005-12-30 | Broad band user cut-in processing method and device and user interface board |
| PCT/CN2006/003436 WO2007076682A1 (en) | 2005-12-30 | 2006-12-15 | A broadband user access device and a method for broadband user access processing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510121457 CN1859585B (en) | 2005-12-30 | 2005-12-30 | Broad band user cut-in processing method and device and user interface board |
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| CN1859585A CN1859585A (en) | 2006-11-08 |
| CN1859585B true CN1859585B (en) | 2010-04-14 |
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| CN 200510121457 Expired - Fee Related CN1859585B (en) | 2005-12-30 | 2005-12-30 | Broad band user cut-in processing method and device and user interface board |
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| WO (1) | WO2007076682A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101312449B (en) * | 2007-05-25 | 2011-06-08 | 魏建才 | Synthetic access equipment |
| US8211073B2 (en) | 2009-06-17 | 2012-07-03 | Hollister Incorporated | Ostomy faceplate having moldable adhesive wafer with diminishing surface undulations |
| CN101945029B (en) * | 2010-09-21 | 2012-03-28 | 南京大学 | XDSL broadband access method and system supporting line division duplex |
| CN104883632B (en) * | 2015-06-12 | 2018-12-18 | 烽火通信科技股份有限公司 | Realize that VDSL flows the device and method of reverse feeding in PON far end system |
| CN109962722B (en) * | 2017-12-26 | 2021-01-05 | 华为技术有限公司 | Transmitting device and signal transmission method |
| CN107911176B (en) * | 2017-12-27 | 2024-06-18 | 长沙深之瞳信息科技有限公司 | Mini signal demodulation board and operation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346577A (en) * | 1999-04-19 | 2002-04-24 | 日本电气株式会社 | Fiber-optic subscriber transmission system |
| CN1450785A (en) * | 2002-04-05 | 2003-10-22 | 北京高吉特通信技术有限公司 | Distributed asymmetrical digital user line broadband optical fiber insertion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1059769C (en) * | 1996-07-05 | 2000-12-20 | 清华大学 | User net-joining method for information high speed road and its system |
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2005
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- 2006-12-15 WO PCT/CN2006/003436 patent/WO2007076682A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346577A (en) * | 1999-04-19 | 2002-04-24 | 日本电气株式会社 | Fiber-optic subscriber transmission system |
| CN1450785A (en) * | 2002-04-05 | 2003-10-22 | 北京高吉特通信技术有限公司 | Distributed asymmetrical digital user line broadband optical fiber insertion system |
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| WO2007076682A1 (en) | 2007-07-12 |
| CN1859585A (en) | 2006-11-08 |
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