CN102882592B - Be applied to 2M light signal transparent transmission device and the method for SDH network - Google Patents
Be applied to 2M light signal transparent transmission device and the method for SDH network Download PDFInfo
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Abstract
The invention discloses a kind of the 2M light signal transparent transmission device and the method that are applied to SDH network, relate to SDH system, this device comprises 2M optical module, clock recovery module, multiplexing/mapping block, demultiplexing/De-mapping module, 2M optical module is connected with clock recovery module, clock recovery module is talked about direction to be connected with multiplexing/mapping block, lower words direction is connected with demultiplexing/demapping, and 2M optical module completes opto-electronic conversion; Clock recovery module carries out clock regeneration to 2M data code flow, code stream is retimed, and forms 2M bit/s NRZ code stream clocking information; Multiplexing/mapping block completes the mapping of 2Mb/s NRZ->TU12->VC12-GreatT.GreaT .GTVC-4; Demultiplexing/De-mapping module completes the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ.The present invention can realize the network management monitoring of 2M light signal transparent transmission and 2M light signal on SDH network, improves stability, reduces expense.
Description
Technical field
The present invention relates to SDH (Synchronous Digital Hierarchy, synchronous digital hierarchy) system, particularly relate to a kind of the 2M light signal transparent transmission device and the method that are applied to SDH network.
Background technology
At present, the application of electric power system optical fiber differential protective is more and more extensive, on 220kV, 500kV circuit, all using optical fiber differential protective as main the means of relay protection.When differential guard signal needs to be transmitted between protective device by SDH network, owing to there is no the unified optical interface that can realize directly being connected between protective device with communication SDH device, therefore between protective device and communication SDH device, general by increasing MUX2M (Multiplexer 2M, 2M multiplexer) and so on photoelectric conversion device, realize Interface Matching, not only less stable, and add cost, also cause the light signal of protective device cannot include optical transmission system webmaster in, make 2M light signal cannot transparent transmission on SDH network, give power supply, ground connection, wiring, malfunction elimination, the operations such as debugging bring difficulty.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of the 2M light signal transparent transmission device and the method that are applied to SDH network are provided, 2M clock signal can be recovered from 2M light signal, realize 2M light signal transparent transmission on SDH network, without the need to the photoelectric converting device MUX2M of centre, improve stability and reduce expense, also achieving the network management monitoring function of 2M light signal.
The 2M light signal transparent transmission device being applied to SDH network provided by the invention, it comprises 2M optical module, clock recovery module, multiplexing/mapping block and demultiplexing/De-mapping module, described 2M optical module is connected with clock recovery module, clock recovery module is talked about direction to be connected with multiplexing/mapping block, lower words direction is connected with demultiplexing/demapping, and described 2M optical module is for completing the conversion of 2M light signal/signal of telecommunication, the 2M signal of telecommunication/light signal; Clock recovery module is used for carrying out clock regeneration to 2M data code flow, code stream is retimed, and forms 2M bit/s NRZ code stream clocking information, completes the recovery of 2M clock; Multiplexing/mapping block is for completing the mapping of 2Mb/sNRZ->TU12->VC12-GreatT. GreaT.GTVC-4; Demultiplexing/De-mapping module is for completing the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ.
In technique scheme, described clock recovery module comprises digital clock data recovery circuit and timing unit, and described digital clock data recovery circuit is used for carrying out clock regeneration to 2M data code flow, recovers data clock; The data clock that described timing unit is used for recovering is retimed.
In technique scheme, described digital clock data recovery circuit comprises edge detection unit, filter and digital controlled oscillator, and their threes are connected between two; 2M optical module is connected with timing unit with edge detection unit respectively, and edge detection unit is all connected with timing unit with digital controlled oscillator, and digital controlled oscillator is for realizing the control to 2M optical module, and the supervision to light signal, optical module state; Edge detection unit is used for the marginal information by high-frequency clock sampled data, connects 0 or 1 place supplement the 2M edge of a pulse not having the data of data edges breach; The information that filter is used for the output of edge detecting unit carries out filtering, exports digital buffer filtering, and domination number controlled oscillator recovers data clock.
In technique scheme, described 2M light signal transparent transmission device also comprises E1 signaling interface conversion module, also comprise in clock recovery module for data cached FIFO, demultiplexing/De-mapping module comprises TU12->2Mb/s NRZ de-mapping unit, 2M optical module by E1 signaling interface conversion module respectively with the FIFO in clock recovery module, digital controlled oscillator in digital clock data recovery circuit is connected, edge detection unit in digital clock data recovery circuit, TU12->2Mb/s NRZ de-mapping unit in demultiplexing/De-mapping module is also all connected with FIFO, E1 signaling interface conversion module is used for carrying out level translation, Network Isolation, filtering and Shape correction, TU12->2Mb/s NRZ de-mapping unit is for extracting the payload of all 2Mb/s NRZ stored in FIFO.
The present invention also provides a kind of 2M light signal transmitting method being applied to SDH network based on said apparatus, comprises the following steps:
Upper words direction: 2M light signal input 2M optical module, 2M optical module completes the conversion of 2M light signal to the signal of telecommunication, generate the 2M data code flow signal of telecommunication, send into clock recovery module, clock recovery module carries out clock regeneration to 2M data code flow, code stream is retimed, form 2Mbit/s NRZ code stream clocking information, complete the recovery of 2M clock, multiplexing/the mapping block of 2M bit/s NRZ code stream clocking information input exported by clock recovery module, multiplexing/mapping block completes the multiplexing mapping of 2Mb/s NRZ->TU12->VC12-GreatT.GreaT .GTVC-4, then transmit on SDH network with the form of VC-4,
Lower words direction: demultiplexing/De-mapping module to from SDH network reception to VC-4 signal, complete the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ; Clock recovery module completes the recovery of 2M clock, completes electrical/optical conversion finally by 2M optical module, forms 2M light signal and exports.
In technique scheme, the process that described in upper words direction, clock recovery module carries out clock regeneration to 2M data code flow, code stream is retimed is as follows: the edge detection unit in described digital clock data recovery circuit is by the marginal information of high-frequency clock sampled data, connect 0 or 1 place there is no the data of data edges breach and supplement the 2M edge of a pulse, the digital buffer filtering domination number controlled oscillator utilizing filter to export recovers data clock, by timing unit, the data clock that digital controlled oscillator recovers is retimed again, complete whole leaching process.
In technique scheme, the described 2M light signal in upper words direction uses NRZ code form to encode, and ensures that the number growing even 0 or 1 is no more than 3, makes enough marginal informations be used in clock recovery.
In technique scheme, lower words direction: described demultiplexing/De-mapping module to from SDH network reception to VC-4 signal, complete in the process of the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/sNRZ further comprising the steps of: the payload that the TU12->2Mb/s NRZ de-mapping unit in demultiplexing/De-mapping module is extracted all 2Mb/s NRZ enters FIFO.
In technique scheme, clock recovery module described in lower words direction completes the recovery process of 2M clock: the digital clock data recovery circuit in clock recovery module is by 2M recovering clock signals heterogeneous uniformly 2M clock signal, then 2M data are read by the 2M clock signal recovered from FIFO, send into E1 signaling interface conversion module, form the 2M signal of telecommunication.
In technique scheme, the light mouth standard of described 2M optical module is as follows: light mouth adopts non-framing light signal; Light mouth does not do requirement to protection side Signal coding mode, but after claimed device code, optical signal rate is 2048 ± 50ppm kb/s, must comprise clock information in signal, and can not occur connecting " 1 " more than 3 long companies " 0 " or length; When there is communication equipment fault or data collocation error, communication side direction protection side continues to send out complete " 1 " high level light signal.
Compared with prior art, advantage of the present invention is as follows:
The present invention can recover 2M clock signal from 2M light signal, realizes 2M light signal transparent transmission on SDH network, without the need to the photoelectric converting device MUX2M of centre, improves stability and reduce expense, also achieve the network management monitoring function of 2M light signal.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram of the embodiment of the present invention in engineering.
Fig. 2 is the structured flowchart of 2M light signal transparent transmission device in the embodiment of the present invention.
Fig. 3 is the schematic diagram that in the embodiment of the present invention, 2M data code flow carries out clock regeneration.
Fig. 4 is the schematic diagram that in the embodiment of the present invention, TU12->2M data clock recovers.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, be applied to the 2M light signal transparent transmission device of SDH network in the embodiment of the present invention, the application in Practical Project is as follows:
Receive direction: in relay protection cell, the protective device of relay protection devices sends 2M light signal, the 2M light signal transparent transmission device of the communication SDH device of communications equipment room is delivered to by optical fiber, the 2M light signal transparent transmission device of communication SDH device completes the opto-electronic conversion of 2M light signal and the 2M signal of telecommunication to the mapping of VC-4 (SDH higher order virtual container), realizes synchronous transmission;
Transmit direction: 2M light signal transparent transmission device demapping from VC-4 of communication SDH device goes out the 2M signal of telecommunication, and completes the conversion of the 2M signal of telecommunication to 2M light signal, 2M light signal by Optical Fiber Transmission to the protective device in relay protection devices.
Shown in Figure 2, the 2M light signal transparent transmission device of SDH network is applied in the embodiment of the present invention, comprise 2M optical module, clock recovery module, multiplexing/mapping block, demultiplexing/De-mapping module, 2M optical module is connected with clock recovery module, clock recovery module is talked about direction to be connected with multiplexing/mapping block, lower words direction is connected with demultiplexing/demapping, and wherein, 2M optical module is for completing the conversion of 2M light signal/signal of telecommunication, the 2M signal of telecommunication/light signal; Clock recovery module is used for carrying out clock regeneration to 2M data code flow, code stream is retimed, and forms 2M bit/s NRZ (No Return Zero, non-return-to-zero coding) code stream clocking information, completes the recovery of 2M clock; Multiplexing/mapping block has been used for the mapping of 2Mb/s NRZ->TU12 (SDH 2M tributary unit)->VC12 (SDH Lower Order Virtual Container)->VC-4; Demultiplexing/De-mapping module is for completing the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ.
Shown in Figure 3, clock recovery module comprises digital clock data recovery circuit and timing unit, digital clock data recovery circuit comprises edge detection unit, filter and NCO (Number Control Oscillator, digital controlled oscillator), their threes are connected between two; 2M optical module is connected with timing unit with edge detection unit respectively, and edge detection unit is all connected with timing unit with digital controlled oscillator, and digital clock data recovery circuit is used for carrying out clock regeneration to 2M data code flow, recovers data clock; The data clock that timing unit is used for recovering is retimed; Digital controlled oscillator is for realizing the control to 2M optical module, and the supervision to light signal, optical module state; Edge detection unit is used for the marginal information by high-frequency clock sampled data, connects 0 or 1 place supplement the 2M edge of a pulse not having the data of data edges breach; The information that filter is used for the output of edge detecting unit carries out filtering, exports digital buffer filtering, and domination number controlled oscillator recovers data clock.
Shown in Figure 4, the 2M light signal transparent transmission device being applied to SDH network also comprises E1 signaling interface conversion module, also comprise for data cached FIFO (First Input First Output in clock recovery module, First Input First Output), demultiplexing/De-mapping module comprises TU12->2Mb/s NRZ de-mapping unit, 2M optical module by E1 signaling interface conversion module respectively with the FIFO in clock recovery module, digital controlled oscillator in digital clock data recovery circuit is connected, edge detection unit in digital clock data recovery circuit, TU12->2Mb/s NRZ de-mapping unit in demultiplexing/De-mapping module is also all connected with FIFO, E1 signaling interface conversion module is used for carrying out level translation, Network Isolation, filtering and Shape correction, TU12->2Mb/s NRZ de-mapping unit is for extracting the payload of all 2Mb/s NRZ stored in FIFO.
On the basis of the above-mentioned 2M light signal transparent transmission device being applied to SDH network, the embodiment of the present invention also provides a kind of 2M light signal transmitting method being applied to SDH network, comprises the following steps:
Upper words direction (2M light port service is mapped to the process of SDH VC-4):
2M light signal input 2M optical module, 2M optical module completes the conversion of 2M light signal to the signal of telecommunication, generate the 2M data code flow signal of telecommunication, send into clock recovery module, clock recovery module carries out clock regeneration to 2M data code flow, code stream is retimed, form 2M bit/s NRZ code stream clocking information, complete the recovery of 2M clock, multiplexing/the mapping block of 2Mbit/s NRZ code stream clocking information input exported by clock recovery module, multiplexing/mapping block completes the multiplexing mapping of 2Mb/s NRZ->TU12->VC12-GreatT.GreaT .GTVC-4, then transmit on SDH network with the form of VC-4.
Shown in Figure 3, the flow process that 2M data code flow carries out clock regeneration, code stream is retimed is as follows: 2M light signal uses NRZ code form to encode, can ensure that the long number connecting 0 or 1 is no more than 3 (relay protection devices signals can not more than 3 continuous full 0s or 1), make enough marginal informations be used in clock recovery.Edge detection unit in digital clock data recovery circuit is by the marginal information of high-frequency clock sampled data, data edges breach is not had because data connect 0 or 1 place, therefore connect 0 or 1 place in data and supplement the 2M edge of a pulse, the digital buffer filtering domination number controlled oscillator utilizing filter to export recovers data clock, by timing unit, the data clock that digital controlled oscillator recovers is retimed again, complete whole leaching process.
Shown in Figure 4, lower words direction (SDH VC-4 demapping causes the process of 2M light mouth):
Demultiplexing/De-mapping module to from SDH network reception to VC-4 signal, complete the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ, the payload that TU12->2Mb/sNRZ de-mapping unit is wherein extracted all 2Mb/s NRZ enters FIFO; Digital clock data recovery circuit in clock recovery module is by 2M recovering clock signals heterogeneous uniformly 2M clock signal, then 2M data are read by the 2M clock signal recovered from FIFO, send into E1 signaling interface conversion module, form the 2M signal of telecommunication, complete electrical/optical conversion finally by 2M optical module, form 2M light signal and export.
Due to 2M optical interface standard ununified at present; the embodiment of the present invention is with reference to the optical interface parameter of other speed announced in ITU-T_G.957 and the application of 2M optical interface in Practical Project; formulate unified 2M optical interface parameter; ginseng is shown in Table 1; the parameter of 2M optical module meets this 2M optical interface parameter; compatible with devices from different manufacturers, realize interconnecting between communication equipment and proterctive equipment.
Table 1,2M optical interface parameter list
In the embodiment of the present invention, the light mouth standard of 2M optical module is as follows:
1, light mouth adopts non-framing light signal;
2, light mouth does not do requirement to protection side Signal coding mode, but optical signal rate is 2048 ± 50ppm kb/s after claimed device code, must clock information be comprised in signal, and can not occur more than 3 long companies " 0 " or long even " 1 " (relay protection devices receiving and transmitting signal requires not occur long more than 3 " 0 ", long " 1 ");
3, when there is communication equipment fault or data collocation error (such as interruption of optical cables between communication station), the side direction that communicates protection side continues to send out complete " 1 " high level light signal;
4, other parameters are formulated see table 1.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention comprises these change and modification.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (10)
1. one kind is applied to the 2M light signal transparent transmission device of SDH network, it comprises multiplexing/mapping block and demultiplexing/De-mapping module, it is characterized in that: it also comprises 2M optical module and clock recovery module, described 2M optical module is connected with clock recovery module, clock recovery module is talked about direction to be connected with multiplexing/mapping block, lower words direction is connected with demultiplexing/demapping, and described 2M optical module is for completing the conversion of 2M light signal/signal of telecommunication, the 2M signal of telecommunication/light signal; Clock recovery module is used for carrying out clock regeneration to 2M data code flow, code stream is retimed, and forms 2M bit/s NRZ code stream clocking information, completes the recovery of 2M clock; Multiplexing/mapping block is for completing the mapping of 2Mb/s NRZ->TU12->VC12-GreatT.GreaT .GTVC-4; Demultiplexing/De-mapping module is for completing the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ.
2. be applied to the 2M light signal transparent transmission device of SDH network as claimed in claim 1, it is characterized in that: described clock recovery module comprises digital clock data recovery circuit and timing unit, described digital clock data recovery circuit is used for carrying out clock regeneration to 2M data code flow, recovers data clock; The data clock that described timing unit is used for recovering is retimed.
3. be applied to the 2M light signal transparent transmission device of SDH network as claimed in claim 2, it is characterized in that: described digital clock data recovery circuit comprises edge detection unit, filter and digital controlled oscillator, their threes are connected between two; 2M optical module is connected with timing unit with edge detection unit respectively, and edge detection unit is all connected with timing unit with digital controlled oscillator, and digital controlled oscillator is for realizing the control to 2M optical module, and the supervision to light signal, optical module state; Edge detection unit is used for the marginal information by high-frequency clock sampled data, connects 0 or 1 place supplement the 2M edge of a pulse not having the data of data edges breach; The information that filter is used for the output of edge detecting unit carries out filtering, exports digital buffer filtering, and domination number controlled oscillator recovers data clock.
4. be applied to the 2M light signal transparent transmission device of SDH network as claimed in claim 3, it is characterized in that: described 2M light signal transparent transmission device also comprises E1 signaling interface conversion module, also comprise in clock recovery module for data cached FIFO, demultiplexing/De-mapping module comprises TU12->2Mb/s NRZ de-mapping unit, 2M optical module by E1 signaling interface conversion module respectively with the FIFO in clock recovery module, digital controlled oscillator in digital clock data recovery circuit is connected, edge detection unit in digital clock data recovery circuit, TU12->2Mb/s NRZ de-mapping unit in demultiplexing/De-mapping module is also all connected with FIFO, E1 signaling interface conversion module is used for carrying out level translation, Network Isolation, filtering and Shape correction, TU12->2Mb/s NRZ de-mapping unit is for extracting the payload of all 2Mb/s NRZ stored in FIFO.
5., based on the 2M light signal transmitting method being applied to SDH network of device described in any one of Claims 1-4, it is characterized in that, comprise the following steps:
Upper words direction: 2M light signal input 2M optical module, 2M optical module completes the conversion of 2M light signal to the signal of telecommunication, generate the 2M data code flow signal of telecommunication, send into clock recovery module, clock recovery module carries out clock regeneration to 2M data code flow, code stream is retimed, form 2Mbit/s NRZ code stream clocking information, complete the recovery of 2M clock, multiplexing/the mapping block of 2M bit/s NRZ code stream clocking information input exported by clock recovery module, multiplexing/mapping block completes the multiplexing mapping of 2Mb/s NRZ->TU12->VC12-GreatT.GreaT .GTVC-4, then transmit on SDH network with the form of VC-4,
Lower words direction: demultiplexing/De-mapping module to from SDH network reception to VC-4 signal, complete the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ; Clock recovery module completes the recovery of 2M clock, completes electrical/optical conversion finally by 2M optical module, forms 2M light signal and exports.
6. be applied to the 2M light signal transmitting method of SDH network as claimed in claim 5, it is characterized in that: above talk about clock recovery module described in direction and clock regeneration is carried out to 2M data code flow, the process that code stream is retimed is as follows: the edge detection unit in described digital clock data recovery circuit is by the marginal information of high-frequency clock sampled data, connect 0 or 1 place there is no the data of data edges breach and supplement the 2M edge of a pulse, the digital buffer filtering domination number controlled oscillator utilizing filter to export recovers data clock, by timing unit, the data clock that digital controlled oscillator recovers is retimed again, complete whole leaching process.
7. be applied to the 2M light signal transmitting method of SDH network as claimed in claim 6, it is characterized in that: the described 2M light signal above talked about in direction uses NRZ code form to encode, ensure that the number growing even 0 or 1 is no more than 3, make enough marginal informations be used in clock recovery.
8. be applied to the 2M light signal transmitting method of SDH network as claimed in claim 7, it is characterized in that: under talk about direction: described demultiplexing/De-mapping module to from SDH network reception to VC-4 signal, complete in the process of the demapping of VC-4->VC12->TU12-GreatT.Grea T.GT2Mb/s NRZ further comprising the steps of: the payload that the TU12->2Mb/s NRZ de-mapping unit in demultiplexing/De-mapping module is extracted all 2Mb/s NRZ enters FIFO.
9. be applied to the 2M light signal transmitting method of SDH network as claimed in claim 8, it is characterized in that: clock recovery module described in lower words direction completes the recovery process of 2M clock and is: the digital clock data recovery circuit in clock recovery module is by 2M recovering clock signals heterogeneous uniformly 2M clock signal, then 2M data are read by the 2M clock signal recovered from FIFO, send into E1 signaling interface conversion module, form the 2M signal of telecommunication.
10. the 2M light signal transmitting method being applied to SDH network as described in any one of claim 5 to 9, is characterized in that: the light mouth standard of described 2M optical module is as follows: light mouth adopts non-framing light signal; Light mouth does not do requirement to protection side Signal coding mode, but after claimed device code, optical signal rate is 2048 ± 50ppm kb/s, must comprise clock information in signal, and can not occur connecting " 1 " more than 3 long companies " 0 " or length; When there is communication equipment fault or data collocation error, communication side direction protection side continues to send out complete " 1 " high level light signal.
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| CN103166698A (en) * | 2013-02-27 | 2013-06-19 | 武汉电信器件有限公司 | 10*10 Giga-bits per second (G) signal source code pattern generator |
| CN106603216B (en) * | 2016-12-06 | 2019-12-10 | 广东高云半导体科技股份有限公司 | e1 timing recovery device of wireless microwave communication system and application thereof |
| CN107968699A (en) * | 2017-12-11 | 2018-04-27 | 国网浙江省电力有限公司 | The transmission method of 2Mbit/s low speed signals in a kind of OTN networks |
| CN112152721A (en) * | 2020-08-21 | 2020-12-29 | 内蒙古电力（集团）有限责任公司内蒙古超高压供电局 | SDH-based E1 optical service access method and device |
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| CN102088327B (en) * | 2009-12-07 | 2013-09-11 | 华为技术有限公司 | Clock data recovery circuit, optical receiver and passive optical network (PON) equipment |
| CN101807819B (en) * | 2010-03-12 | 2012-06-20 | 中国南方电网有限责任公司 | Electric line protection system and method for transmitting relay protection signals |
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