CN1571505A - Method for transmitting multiple digital subscriber line services by using coaxial cable, and equipment therefor - Google Patents
Method for transmitting multiple digital subscriber line services by using coaxial cable, and equipment therefor Download PDFInfo
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Abstract
The invention provides a method and its adoptive equipment which is adopts the coaxial cable to transmit the xDSL. The method includes that the data flow is transformed to xDSL signal when the coaxial cable is transmitted the data flow; the transformed xDSL signal is transformed to non equilibrium signal to send to the coaxial cable to transmit; when the coaxial cable is received the data flow, the non equilibrium signal transformed in coaxial cable is transformed to xDSL signal; and the transformed xDSL signal is transformed to data flow to output. The invention is used the coaxial cable to supply the broad band xDSL access to operator, who has the other coaxial cable resource (such as television coaxial cable resource), but not the twisted pair coaxial cable, also can supply the broad band xDSL access. And the advantages of invention are that the operating cost and the resource waste are reduced, the application of the xDSL is more popular.
Description
Invention field
The present invention relates to data communication technology, particularly adopt coaxial cable to transmit the method and the equipment thereof of xDSL (multiple Digital Subscriber Line) business datum.
Background technology
Along with developing rapidly of broadband network and broadband services, the technology of development xDSL broadband access is widely used on the twisted-pair feeder of telephone subscriber's cable.The xDSL technology is based on the modulation technique of general twisted-pair power cable, has developed standards such as having formed ADSL (asymmetric digital subscriber line) technology, VDSL (Very-high-speed Digital Subscriber Line) technology, SHDSL (single pair high bit rate digital subscriber loop) technology at present.
Fig. 1 has shown the schematic diagram that adopts twisted-pair feeder transmission xDSL data.At this twisted-pair feeder with telephone cable is in the xDSL technology of transmission medium, and what transmit on twisted-pair feeder also is balanced signal (or claim differential signal), and the signal phase that two lines of twisted-pair feeder promptly transmit on the A line among the figure and the B line is just opposite.Thereby the signal that being used to of current exploitation provides the xDSL interface of the DSLAM (Digital Subscriber Line access and multiplexing device) that xDSL inserts to adopt is differential signal.What as shown in the figure, the xDSL modem (modulator-demodulator) of broadband xDSL access device and user side correspondingly adopted all is Balanced interface (differential interface).
Because present xDSL technology all can only adopt twisted-pair feeder to transmit, and many operators do not have the twisted-pair wire net of oneself, therefore can't adopt the xDSL technology that wideband switch-in business is provided.If these operators need adopt xDSL that broadband services is provided, just can only open xDSL and insert by the twisted-pair feeder of leasing other operator.
But,, often may have the resource (for example power line resource, coaxial cable resource etc.) of other relatively abundanter accesses though these operators do not have the twisted-pair feeder resource.Therefore, lease the twisted-pair feeder of other operator, can increase operation cost undoubtedly, and cause the wasting of resources, be unfavorable for popularization and the extensive application of xDSL if abandon these access-in resources (power line resource, coaxial cable resource).
Summary of the invention
Therefore, for the operation cost that can only use twisted-pair feeder transmission xDSL business to be brought that overcomes prior art increases and the defective of the wasting of resources, the present invention proposes the method and apparatus that on coaxial wire, transmits the xDSL business.
According to a first aspect of the invention, a kind of method that is implemented in transmission xDSL business on the coaxial wire is provided, this method comprises: when coaxial cable sends data flow, this data flow is converted to the xDSL signal, and be non-equilibrium signal with the xDSL conversion of signals of being changed, deliver on the coaxial wire and transmit; On coaxial wire during receiving data stream, the non-equilibrium signal of coaxial cable transmission is converted to the xDSL signal, be data flow output with the xDSL conversion of signals of being changed.
According to a further aspect in the invention, provide a kind of equipment that transmits the xDSL business on coaxial wire, this equipment comprises: the xDSL processing module, and being used in the future, the data flow of automatic network side interface is converted to the output of xDSL signal; And signal conversion module, being used for the xDSL conversion of signals from described xDSL processing module is non-equilibrium signal, and is sent in the coaxial cable and transmits.Kind difference (ADSL, ADSL2, ADSL+ according to the xDSL business of being transmitted, VDSL, SHDSL etc.), the xDSL processing module correspondingly can the ADSL processing module, VDSL processing module or SHDSL processing module etc., and the processing unit that it comprised also correspondingly changes.
In embodiments of the invention, signal conversion module can be passive signal conversion module or active signal conversion module.In addition, described signal conversion module can be arranged within the described equipment or outside, or become one with described xDSL processing module.
By adopting the technology of employing coaxial cable transmission xDSL of the present invention, can provide broadband xDSL to insert by coaxial cable, not have the twisted-pair feeder resource but have the operator of other coaxial cable resource (for example television coaxial cable resource) also can provide broadband xDSL to insert thereby make.Cut operating costs, reduce the wasting of resources, it is more universal that xDSL is used.
Description of drawings
By detailed explanatory note and in conjunction with the following drawings, above-mentioned purpose of the present invention, feature and the advantage easy to understand more that will become, wherein:
Fig. 1 is the schematic diagram of the employing twisted-pair feeder transmission xDSL business of explanation prior art;
Fig. 2 is the schematic diagram of explanation employing coaxial cable transmission of the present invention xDSL business;
Fig. 3 is the block diagram that the ADSL processing module of using in one embodiment of the invention is described;
Fig. 4 is the block diagram of explanation according to the ADSL module of using in one embodiment of the invention that is built-in with modular converter;
Fig. 5 is the schematic diagram according to employing E1 coaxial cable transmission ADSL of the present invention, and the situation of local side has been described;
Fig. 6 is the internal structure block diagram according to the signal conversion module of using in one embodiment of the invention;
Fig. 7 has shown the schematic diagram of user side configuration when adopting E1 coaxial cable transmission ADSL.
Embodiment
Below in conjunction with description of drawings preferred implementation of the present invention.
As shown in Figure 2, in the present invention, owing to adopted the transport vehicle of coaxial cable as xDSL, therefore the signal that is transmitted just changes non-equilibrium signal into from balance (difference) signal that the employing twisted-pair feeder uses during as transport vehicle.Correspondingly, be provided with unbalanced interface to be connected in the broadband xDSL access device of local side with coaxial cable.The xDSL signal is by the coaxial inner conductor transmission of coaxial cable.In a preferred embodiment of the invention, the screen of coaxial cable can ground connection to strengthen shield effectiveness.Certainly, the screen of coaxial cable also can be earth-free.
The xDSL modem of user side also is provided with the unbalanced interface of user side, is connected on the coaxial cable, to receive the xDSL signal that sends from broadband xDSL access device and to handle.
In the present invention, adopt the xDSL technology of coaxial cable transmission can be ADSL technology, ADSL2 technology, ADSL+ technology, VDSL technology, SHDSL technology etc.
In the present invention, the coaxial cable of transmission xDSL technology can be for transmitting 75 ohm coaxial cable of E1 signal; Also can be cable tv coax.
To be example to adopt E1 coaxial cable transmission ADSL technology below, the equipment and the method that adopt coaxial cable transmission xDSL according to realization of the present invention will be described.
Here the functional unit in the ADSL processing module of mentioning can be conventional ADSL processing module, also can be the built-in ADSL processing module of balance/non-equilibrium modular converter.This balance/non-equilibrium modular converter will be converted to non-equilibrium signal from the balanced signal of ADSL processing module side.
The block diagram of conventional ADSL processing module as shown in Figure 3.Wherein comprise on down direction: the ADSL framer is used for the data flow from network side is carried out the signal framing; Cyclic-redundancy-check unit is used to the signal of framing to generate cyclic redundancy check (CRC) code; RS (Read-Solomon) encoder is used for the framing signals that has cyclic redundancy check (CRC) code is carried out the RS coding; DMT (discrete multitone modulation) modulating unit is used for the data flow behind the RS coding is carried out the DMT modulation, and increases processing such as Cyclic Prefix; D/A conversion unit is used for the signal behind the inverse fourier transform is carried out the digital-to-analog conversion; And filtering and amplifying unit, be used for the signal of D/A conversion unit output is carried out filtering and amplification, be sent to signal conversion unit.
The ADSL processing module comprises on up direction: amplify and filter unit, be used for the ADSL signal from the signal modular converter is amplified and filtering; AD conversion unit is a digital signal with the analog signal conversion of amplifying and filter unit is exported; The DMT demodulating unit is used for data diffluence circulation prefix processing that analog-to-digital conversion is come, and processed data stream is carried out the DMT demodulation; RS (Read-Solomon) decoder carries out the RS decoding to the signal that goes map unit output; Cyclic-redundancy-check unit, the signal that the RS decoder is exported carries out cyclic redundancy check (CRC); The ADSL deframer is separated frame with the signal of cyclic redundancy check (CRC) success, is sent to network side.
The block diagram of the ADSL module of built-in modular converter comprises on sending direction that wherein ADSL becomes frame module, CRC check module, RS coding module, DMT modulation module, A/D modular converter and balance/non-equilibrium modular converter (wherein having comprised enlarging function in balance/non-equilibrium modular converter) as shown in Figure 4; Comprise that on receive direction balance/non-equilibrium modular converter, A/D modular converter, DMT demodulation module, RS decoder module, CRC check module and ADSL separate frame module.
Be example still below, adopt coaxial cable to transmit the method for xDSL according to realization of the present invention in conjunction with Fig. 5, Fig. 6 and Fig. 7 explanation to adopt E1 coaxial cable transmission ADSL technology (external signal conversion module).
At first with reference to figure 5, it shows the schematic diagram that adopts E1 coaxial cable transmission ADSL, and the situation of local side has been described.As shown in the figure, adopt E1 coaxial cable transmission ADSL technology, need configure ADSL processing module, local side signal conversion module at local side.The ADSL processing module is mainly finished the data flow that will bring from the network side interface and is converted to the output of ADSL signal.The effect of local side signal conversion module is that the ADSL conversion of signals that will bring from the ADSL processing module is a non-equilibrium signal, delivers in the coaxial cable and transmits.
The internal frame diagram of signal conversion module mainly comprises xDSL processing module side impedance matching module, balance/non-equilibrium modular converter and coaxial cable side impedance matching module as shown in Figure 6.XDSL processing module side impedance matching module mainly is to finish the input of signal conversion module and the impedance matching function of xDSL processing module.Balance/non-equilibrium modular converter mainly is to finish the function that the balanced signal from ADSL processing module side is converted to non-equilibrium signal.Coaxial cable side impedance matching module mainly is to finish the output of signal conversion module and the impedance matching function of coaxial cable.In the xDSL of signal conversion module processing module side, employing be balance (difference) signal, the phase place of signal is opposite on its two transmission lines.In the coaxial cable side of signal conversion module, employing be coaxial cable output, output be non-equilibrium signal, transmission signals in the heart yearn of coaxial cable.The shield external layer ground connection of coaxial cable.
In the embodiment with coaxial cable transmission ADSL business according to the present invention, the concrete handling process of local side apparatus is as follows:
Down direction (from network side to the coaxial cable side):
The ADSL processing module receives the ATM data flow of coming from network side, finish framing, Cyclic Redundancy Check, Reed Solomon Coding (RS coding), DMT modulation, mould/number conversion (D/A conversion), the filtering of ATM cell according to the method for routine and amplify, the ATM data flow is converted to the ADSL signal is sent to the local side signal conversion module; The local side signal conversion module receives the ADSL signal that the ADSL processing module is brought, and by conversion, is converted to nonequilibrium signal output, sends on the E1 coaxial cable and transmits.
Up direction (from the coaxial cable side to network side):
The local side signal conversion module receives the non-equilibrium signal that sends on the E1 coaxial cable, is converted to the ADSL signal of balance, delivers to the ADSL processing module and handles; The ADSL processing module receives the ADSL signal that the local side signal conversion module is brought, and the ADSL signal of receiving amplified, filtering, mould/number conversion (A/D conversion), DMT demodulation, Read-Solomon decoding (RS decoding), Cyclic Redundancy Check, separates frame, be reduced to the ATM data flow, send to network side.
Fig. 7 has shown the schematic diagram of user side configuration when adopting E1 coaxial cable transmission ADSL.As shown in the figure, need configure ADSL processing module and user side signal conversion module at user side.
The concrete handling process of the ADSL access device of user side is as follows:
Down direction (from the coaxial cable side to user side):
The user side signal conversion module receives the non-equilibrium signal that sends on the E1 coaxial cable, is converted to the ADSL signal of balance, delivers to user side ADSL processing module and handles; User side ADSL processing module receives the ADSL signal that the user side signal conversion module is brought, and the ADSL signal of receiving amplified, filtering, mould/number conversion (A/D conversion), DMT demodulation, Read-Solomon decoding (RS decoding), cyclic redundancy check (CRC) (CRC check), separates frame, be reduced to the ATM data flow, and be converted to corresponding data flow, mail to user side equipment.
Up direction (from user side to the coaxial cable side):
User side ADSL processing module receives the data flow of coming from user side, by conversion, form the ATM data flow, and the framing, scrambler CRC, Reed Solomon Coding (RS coding), DMT modulation, mould/number conversion (D/A conversion), filtering of finishing ATM cell amplify, and the ATM data flow is converted to the ADSL signal is sent to the user side signal conversion module; The user side signal conversion module receives the ADSL signal that user side ADSL processing module is brought, and is converted to nonequilibrium signal output, sends on the E1 coaxial cable and transmits.
On function, the function that two modules of local side and two modules of user side are finished is the same, but the processing procedure on the uplink and downlink direction is just opposite.Need to prove that though the function that realizes in two modules of two modules of local side and user side is the same, the unit of functional module is formed and be different.The resume module of local side is to handle at downstream bands, and the resume module of user side is handled at upstream band.
Although it is that example illustrates that explanation is above transmitted the ADSL business with coaxial cable, the solution of the present invention obviously goes for other xDSL business, for example VDSL, SHDSL etc.These are different when professional when being applied to, and respective x DSL processing module is different.Specifically:
When transmitting the VDSL business with coaxial cable, respective x DSL processing module is the VDSL processing module, and this module comprises on down direction:
Scrambler, the data flow that is used for the automatic network side is entered is carried out scrambler; RS (Read-Solomon) encoder is used for carrying out the RS coding to carrying out described scrambler signal afterwards; Interleaver is used for the signal after the RS coding is carried out interleaving treatment; The VDSL framer is used for coming described data flow to carry out the signal framing; Modulator is used for the data after the framing are modulated; D/A conversion unit is used for the signal after the modulation is carried out the digital-to-analog conversion; And filtering and amplifying unit, be used for the signal of D/A conversion unit output is carried out filtering and amplification, be sent to signal conversion unit;
On up direction, comprise:
Amplify and filter unit, be used for the VDSL signal from the signal modular converter is amplified and filtering; AD conversion unit is a digital signal with the analog signal conversion of amplifying and filter unit is exported; Demodulator is with the digital demodulation signal of AD conversion unit output; The VDSL deframer is used for the VDSL frame is reduced to data flow; Deinterleaver, processing is used to deinterleave; RS (Read-Solomon) decoder, the signal of handling back output to deinterleaving carries out the RS decoding; Descrambler carries out descrambling code with the decoded signal of RS, is sent to network side.
Equally, when transmitting the SHDSL business with coaxial cable, respective x DSL processing module is the SHDSL processing module, comprises on receive direction:
The SHDSL framer is used for the data flow from network side is carried out the signal framing; Scrambler is used for the data flow after the framing is carried out scrambler; The TCM encoder is used for the data flow after the scrambler is carried out the TCM coding; Precoder is used for the data flow of TCM coding output is carried out precoding; The circuit amplifying circuit is used for signal is amplified, and outputs on the line interface;
Comprise on sending direction: the circuit amplifying circuit is used for the signal that receives from circuit is amplified; The precoding decoder is used for signal is carried out the precoding decoding; The TCM coding decoder is used for the TCM coding that receives is decoded; Descrambler is used for the data flow after the TCM decoding is carried out descrambling code; The SHDSL deframer is used for the data flow after the descrambling code is separated frame.
Two kinds of xDSL modules (being the xDSL module of built-in signal modular converter and the xDSL module of external signal conversion module) have above been mentioned.XDSL module when professional is identical with the at present general transmission xDSL that utilizes twisted-pair feeder in the realization of the xDSL module of external signal conversion module, and this paper no longer further describes this.The xDSL module of built-in signal modular converter and the xDSL module difference of using at present just are to have added signal conversion module in original xDSL module.
Claims (10)
1. on coaxial wire, transmit the method for xDSL business, this method comprises: when coaxial cable sends data flow, this data flow is converted to the xDSL signal, and is non-equilibrium signal, deliver on the coaxial wire and transmit the xDSL conversion of signals of being changed; On coaxial wire during receiving data stream, the non-equilibrium signal of coaxial cable transmission is converted to the xDSL signal, and is data flow output the xDSL conversion of signals of being changed.
2. method according to claim 1, wherein said coaxial cable are 75 ohm coaxial cable or cable tv coax.
3. method according to claim 1, the shielding layer grounding of wherein said coaxial cable.
4. according to each described method of claim 1-3, wherein said xDSL comprises ADSL, ADSL2, ADSL+, VDSL, SHDSL.
5. transmit the equipment of xDSL business on coaxial wire, this equipment comprises: the xDSL processing module, and being used in the future, the data flow of automatic network side interface is converted to the output of xDSL signal; And signal conversion module, being used for the xDSL conversion of signals from described xDSL processing module is non-equilibrium signal, and is sent in the coaxial cable and transmits.
6. equipment according to claim 5, wherein said xDSL processing module is the ADSL processing module, this module comprises:
The ADSL framer is used for the data flow from network side is carried out the signal framing; Cyclic-redundancy-check unit is used to the signal of framing to generate cyclic redundancy check (CRC) code; The RS encoder is used for the described framing signals that has cyclic redundancy check (CRC) code is carried out the RS coding; The DMT modulating unit is used for the data flow behind the RS coding is carried out the DMT modulation, and increases processing such as Cyclic Prefix; D/A conversion unit is used for the signal after the DMT modulation is carried out the digital-to-analog conversion; And filtering and amplifying unit, be used for the signal of D/A conversion unit output is carried out filtering and amplification, be sent to signal conversion unit; And/or
Amplify and filter unit, be used for the ADSL signal from the signal modular converter is amplified and filtering; AD conversion unit is a digital signal with the analog signal conversion of amplifying and filter unit is exported; The DMT demodulating unit is used for data diffluence circulation prefix processing that analog-to-digital conversion is come, and processed data stream is carried out the DMT demodulation; The RS decoder carries out the RS decoding to the signal that goes map unit output; Cyclic-redundancy-check unit, the signal that the RS decoder is exported carries out cyclic redundancy check (CRC); The ADSL deframer is separated frame with the signal of cyclic redundancy check (CRC) success, is sent to network side.
7. equipment according to claim 5, wherein said xDSL processing module is the SHDSL processing module, this module comprises:
The SHDSL framer is used for the data flow from network side is carried out the signal framing; Scrambler is used for the data flow after the framing is carried out scrambler; The TCM encoder is used for the data flow after the scrambler is carried out the TCM coding; Precoder is used for the data flow of TCM coding output is carried out precoding; The circuit amplifying circuit is used for signal is amplified, and outputs on the line interface; And/or
The circuit amplifying circuit is used for the signal that receives from circuit is amplified; The precoding decoder is used for signal is carried out the precoding decoding; The TCM coding decoder is used for the TCM coding that receives is decoded; Descrambler is used for the data flow after the TCM decoding is carried out descrambling code; The SHDSL deframer is used for the data flow after the descrambling code is separated frame.
8. equipment according to claim 5, wherein said xDSL processing module is the VDSL processing module, this module comprises:
Scrambler is used for the data flow that enters from network side is carried out scrambler; The RS encoder is used for the signal after the described scrambler is carried out the RS coding; Interleaver is used for the signal after the RS coding is carried out interleaving treatment; The VDSL framer is used for coming described data flow to carry out the signal framing; Modulator is used for the data after the framing are modulated; D/A conversion unit is used for the signal after the modulation is carried out the digital-to-analog conversion; And filtering and amplifying unit, be used for the signal of D/A conversion unit output is carried out filtering and amplification, be sent to signal conversion unit; And/or
Amplify and filter unit, be used for the VDSL signal from the signal modular converter is amplified and filtering; AD conversion unit is a digital signal with the analog signal conversion of amplifying and filter unit is exported; Demodulator is with the digital demodulation signal of AD conversion unit output; The VDSL deframer is used for the VDSL frame is reduced to data flow; Deinterleaver, processing is used to deinterleave; The RS decoder, the signal of handling back output to deinterleaving carries out the RS decoding; Descrambler carries out descrambling code with the decoded signal of RS, is sent to network side.
9. according to each described equipment of claim 5-8, wherein said signal conversion module comprises: xDSL processing module side impedance matching module is used for the input of signal conversion module and the impedance matching of xDSL processing module output; Balance/non-equilibrium modular converter will be converted to non-equilibrium signal from the balanced signal of xDSL processing module side; With coaxial cable side impedance matching module, be used for the output of signal conversion module and the impedance matching of coaxial cable.
10. equipment according to claim 9, wherein said signal conversion module and described xDSL processing module become one, or are arranged with described xDSL processing module branch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031785743A CN100353761C (en) | 2003-07-18 | 2003-07-18 | Method for transmitting multiple digital subscriber line services by using coaxial cable, and equipment therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031785743A CN100353761C (en) | 2003-07-18 | 2003-07-18 | Method for transmitting multiple digital subscriber line services by using coaxial cable, and equipment therefor |
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| CN1571505A true CN1571505A (en) | 2005-01-26 |
| CN100353761C CN100353761C (en) | 2007-12-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103763005A (en) * | 2014-01-21 | 2014-04-30 | 潘光平 | Multi-transmission-medium mixed type network camera design method |
| CN104221342A (en) * | 2012-04-16 | 2014-12-17 | 高通股份有限公司 | Variable-length cyclic prefixes in OFDM coaxial communications |
| CN110351512A (en) * | 2019-05-24 | 2019-10-18 | 无锡中感微电子股份有限公司 | A kind of data transmission method for uplink and device based on coaxial cable |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5408260A (en) * | 1994-01-11 | 1995-04-18 | Northern Telecom Limited | Customer premises ADSL signal distribution arrangement |
| AU2203300A (en) * | 1998-12-29 | 2000-07-31 | Qwest Communications International Inc. | Wiring architecture for providing combined voice and vdsl service to residentialbuildings |
| CN1131603C (en) * | 2001-07-13 | 2003-12-17 | 清华大学 | Wiring access method of broadband multimedia services |
| JP2003069639A (en) * | 2001-08-27 | 2003-03-07 | Nec Corp | xDSL STORAGE DEVICE, MULTICAST DELIVERY SYSTEM, AND DATA DELIVERY METHOD |
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2003
- 2003-07-18 CN CNB031785743A patent/CN100353761C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104221342A (en) * | 2012-04-16 | 2014-12-17 | 高通股份有限公司 | Variable-length cyclic prefixes in OFDM coaxial communications |
| CN104221342B (en) * | 2012-04-16 | 2018-03-06 | 高通股份有限公司 | Variable-length cyclic prefix in OFDM coaxial telecommunications |
| CN103763005A (en) * | 2014-01-21 | 2014-04-30 | 潘光平 | Multi-transmission-medium mixed type network camera design method |
| CN110351512A (en) * | 2019-05-24 | 2019-10-18 | 无锡中感微电子股份有限公司 | A kind of data transmission method for uplink and device based on coaxial cable |
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| CN100353761C (en) | 2007-12-05 |
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