CN102761373A - High-speed high-capacity passive optical network system and method for realizing coherent reception - Google Patents
High-speed high-capacity passive optical network system and method for realizing coherent reception Download PDFInfo
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Abstract
The invention relates to the technical field of passive optical networks, and provides a high-speed high-capacity passive optical network system and a method for realizing coherent reception. The passive optical network system comprises an optical line terminal (OLT), a trunk optical fiber, a passive optical coupler, a branch optical fiber and an optical network unit (ONU). The access network system supports signal transmission at the rate of 40Gb/s, transmission symbol rate is reduced owing to high-order multidimensional modulation of a 40Gb/s signal transmitting unit, corresponding ONU (OLT) receiving units are provided with a coherent reception and electricity-domain digital signal processor to improve sensitivity of a receiver and power budget of the system, and cost of the system is effectively lowered owing to a coherent reception mechanism combining a local-oscillator laser source with a transmission laser source.
Description
Technical field
The present invention relates to the passive optical network technique field, particularly a kind of high-speed high capacity passive optical network and method that realizes coherent reception.
Background technology
Along with the fast continual development of the Internet, continuing to bring out of bandwidth applications such as high definition IPTV, digital movie, the true system of net had higher requirement to the bandwidth of following Access Network.Consider the requirement cheaply of the big branching ratio of the big capacity of Access Network, passive optical network PON (passive optical network) is the optimal selection of Access Network.But in the face of presenting the bandwidth demand of exponential increase, present standardized 10Gbps TDM-PON system will be not enough to satisfy following bandwidth demand.Therefore, next-generation passive optical network PON will support 40Gbps even higher speed.
On-off keying (OOK) modulation system that present 10Gbps PON system transmitting element adopts, the direct detection mode that receiving element adopts.If 10Gbps PON system speed is directly brought up to 40Gbps even when higher, because light signal can receive the influence of linear effect and nonlinear effect when in optical fiber, transmitting simultaneously, the transmission quality of system is with rapid deterioration.Linear effect comprises chromatic dispersion, polarization mode dispersion etc., and nonlinear effect comprises four wave mixing (FWM), stimulated Raman scattering (SRS) etc.Chromatic dispersion in the linear effect and polarization mode dispersion meeting be along with the increase of transmission rate is quadratic growth, thereby make the transmission quality rapid deterioration.So, if present 10Gbps PON system speed is directly brought up to 40Gbps even when higher, because the aggravation of dispersive influence, the power budget of passive optical network and chromatic dispersion budget will far can not satisfy the demands.
With it simultaneously; Along with professional the rolling up of two-forty quality data; Backbone network has solved the transmission problem of 40Gbps basically; But because there are own characteristics such as cost sensitivity in optical access network, can not directly backbone network 40Gbps transmission technology be applied in the optical access network, therefore how the modulation and demodulation of implemented with low cost 40Gbps high speed signal are development 40Gbps optical access network key technology of future generation difficult problems.
Summary of the invention
The technical problem that (one) will solve
Shortcoming to prior art; The present invention is in order to solve the modulation and demodulation problem that in optical access network, is difficult to realize high speed signal in the prior art; A kind of high-speed high capacity passive optical network and method of coherent reception are provided; Reduce the character rate of system effectively, improved the availability of frequency spectrum, and improved the sensitivity of receiver and the power budget of system.
(2) technical scheme
For this reason, the present invention adopts following technical scheme to carry out particularly:
At first, the present invention provides a kind of high-speed high capacity passive optical network of realizing coherent reception, and said system comprises:
Optical line terminal OLT 1, main line optical fiber 2, passive optical coupler 3, branch road optical fiber 4 and at least one optical network unit ONU 5; Said optical line terminal OLT 1 is connected with said passive optical coupler 3 through said main line optical fiber 2, and said passive optical coupler 3 is connected with said at least one optical network unit ONU 5 through said branch road optical fiber 4 again; Wherein,
Said optical line terminal OLT 1 constitutes the OLT transmitting element by OLT light source 101, the first polarization beam splitting module 102, at least one multi-system optical modulator 103 and polarization coupled module 104;
Said optical network unit ONU 5 constitutes the ONU receiving element by the second polarization beam splitting module 501, ONU light source 502, the relevant frequency mixer 503 of at least one light, at least one photoelectric conversion module 504, at least one signal sampling modules A DC505 and digital signal processor DSP 506.
Preferably, when carrying out asymmetric coherent reception, said optical network unit ONU 5 constitutes the ONU transmitting element by said ONU light source 502 with electric absorption EA modulator 507; Said optical line terminal OLT 1 constitutes the OLT receiving element by photodiode PD105 and 3R module.
Preferably; When carrying out the coherent reception of symmetry; The ONU transmitting element of said optical network unit ONU 5 is identical with the structure of said OLT transmitting element; The OLT receiving element of said optical line terminal OLT 1 is identical with the structure of said ONU receiving element, and the shared said ONU light source of said ONU transmitting element and said ONU receiving element 502, said OLT receiving element and the shared said OLT light source 101 of said OLT transmitting element.
Further, the present invention also provides the method that realizes coherent reception in a kind of high-speed high capacity passive optical network simultaneously, it is characterized in that said method comprises step:
The laser that OLT light source 101 produces is divided into the light beam of the two-way polarization state quadrature of V direction and H direction through the first polarization beam splitting module 102;
Utilize the multi-system optical modulator 103 of two parallel connections to generate single channel V polarization signal and single channel H polarization signal through multilevel code;
Utilize polarization coupled module 104 to accomplish palarization multiplexing, produce the multi-system modulation signal of one road palarization multiplexing;
The multi-system modulation signal of said one road palarization multiplexing downlinks at least one optical network unit ONU 5 through branch road optical fiber 4 through main line optical fiber 2 through passive optical coupler 3 again;
The signal that ONU receives at first is divided into the light signal of the two-way orthogonal polarisation state of directions X and Y direction through the second polarization beam splitting module 501;
ONU light source 502 produces the local oscillator light signal of the needs of coherent reception;
Utilize the relevant frequency mixer 503 of light to accomplish the coherent reception of X, Y direction two-way polarization signal and local oscillation signal;
The signal of relevant frequency mixer 503 outputs of light carries out opto-electronic conversion through photoelectric conversion module 504, and DC505 samples and quantification treatment through the signal sampling modules A, accomplishes analog-to-digital conversion;
Then, the discrete digital sequence after sampling and the quantification is admitted in the digital signal processor DSP 506 and receives processing.
Preferably, receiving the processing operation in the said digital signal processor DSP 506 comprises:
Digital signal is carried out clock synchronization through clock recovery;
Eliminate the influence of chromatic dispersion and carry out polarization demultiplexing through electric territory is balanced;
Remove the phase deviation that frequency deviation is brought through frequency offset estimating, eliminate the phase difference that receives between signal and the local oscillator light signal through phase estimation;
Through more than after several processing links, thereby recover original transmission signal by the decision device judgement.
Preferably, if carry out asymmetric coherent reception, during transmitting uplink data, the ONU transmitting element is loaded into upstream data. signals on the electric absorption EA modulator 507, carries out transferring out after the on-off keying OOK modulation; The signal that the OLT receiving element adopts the mode demodulation of directly detection to receive.
Preferably, if carry out the coherent reception of symmetry, during transmitting uplink data, adopt the inverse process of downlink transfer to transmit data to OLT from ONU.
Preferably, the concrete mode of said multilevel code is M-PSK mode or M-QAM mode.
Preferably, saidly carry out the clock synchronization concrete steps through clock recovery and be: the symbol sampling that utilizes interpolation filter adjustment receiver makes adjusted receiver sampling clock synchronous with the emission symbol clock constantly; Said polarization demultiplexing adopts the equalization filter of butterfly structure to realize.
Preferably, the concrete mode of said multilevel code is M-PSK mode or M-QAM mode, and multilevel code described in downlink transfer and the uplink can adopt identical or different mode to carry out.
(3) beneficial effect
The high-speed high capacity passive optical network of coherent reception provided by the invention and method are through adopting high-order multi-system (multidimensional) modulation; Reduced the character rate of system effectively; Improve the availability of frequency spectrum, through adopting coherent reception and electric territory Digital Signal Processing, improved the sensitivity of receiver and the power budget of system simultaneously; And utilize the mechanism of local oscillator light source and transmitting illuminant homology, reduced the cost of system effectively.
Description of drawings
General coherent reception EPON (descending 40Gbps, the up 10Gbps) system architecture diagram that Fig. 1 proposes for the present invention;
Fig. 2 is digital signal processor (DSP) process flow block diagram of the general coherent reception passive optical network of the present invention's proposition;
EPON (descending 40Gbps, the up 10Gbps) system architecture diagram that the employing PM-DQPSK that Fig. 3 proposes for the present invention modulates;
EPON (descending 40Gbps, the up 10Gbps) system architecture diagram that the employing PM-8PSK that Fig. 4 proposes for the present invention modulates;
Up-downgoing symmetry EPON (descending 40Gbps, the up 40Gbps) system architecture diagram that the employing PM-DQPSK that Fig. 5 proposes for the present invention modulates.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.
High-speed high capacity EPON general-purpose system (the descending 40Gbps of the coherent reception that the present invention proposes; Up 10Gbps) as shown in Figure 1; This system is made up of optical line terminal (OLT) 1, main line optical fiber 2, passive optical coupler 3, branch road optical fiber 4 and optical network unit (ONU) 5 etc., and wherein the transmitting element of OLT is made up of light source 101, polarization beam splitting module 102, multi-system optical modulator 103, polarization coupled module 104.The receiving element of ONU is by polarization module 501, light source 502, the relevant frequency mixer 503 of light and photoelectric conversion module 504, signal sampling module (ADC) 505, digital signal processor (DSP) 506 formations such as grade.
The operation principle of this system is following: when OLT sent the 40Gb/s downstream signal to ONU, at the OLT transmitting element, the laser that laser produces was divided into the light beam of two-way polarization state quadrature (being designated as V direction and H direction) through polarization beam apparatus (PBS).Transmitter one tunnel speed is the signal of 20Gbps, and (DQPSK, 8PSK 16QAM), utilize the single channel V polarization signal of the MZ modulator generation M-PSK/M-QAM of two parallel connections then through multilevel code.Likewise, other one road H polarization signal adopts identical method modulation to generate.Utilize polarization beam splitting synthesizer (PBC) to accomplish palarization multiplexing then, produce the multi-system modulation signal of one road palarization multiplexing.
When the 40Gb/s of one road palarization multiplexing downstream signal arrival ONU receiving element, the signal of receiving at first is divided into the light signal (be designated as directions X and Y direction, be different from V direction and H direction) of two orthogonal polarisation state through polarization beam apparatus (PBS).Utilize 90 ° of frequency mixers and balanced reciver to accomplish the coherent reception of two-way polarization signal and local oscillation signal then.The local oscillator laser of ONU end is through optical branching device output two-way light, one tunnel local oscillator light signal as the needs of coherent reception, and another road is as the transmitting illuminant of ONU transmitting element, and local oscillator light and the mechanism of emission light homology have been controlled the cost of system effectively.The signal of mixing output carries out opto-electronic conversion through the overbalance photoelectric detector, samples and quantification treatment through ADC, accomplishes analog-to-digital conversion.Then, the discrete digital sequence after sampling and the quantification is admitted to digital signal processor (DSP) and handles, and the DSP handling process is as shown in Figure 2.
In dsp processor; Digital signal is carried out clock synchronization through clock recovery earlier; Because the sampling clock of ADC is the symbol clock that is independent of transmitting terminal; So must utilize the symbol sampling moment of interpolation filter adjustment receiver, make adjusted receiver sampling clock synchronous with the emission symbol clock, guarantee that promptly the sampling rate of ADC and character rate fit like a glove.Eliminate the influence of chromatic dispersion and carry out polarization demultiplexing through electric territory is balanced then, because the imperfection of channel, signal must receive the influence of channel and cause damage in transmission, and this influence is mainly from chromatic dispersion.In order to handle this damage, must use balancing technique.Simultaneously; Because system adopts the modulation system of palarization multiplexing, each polarization signal will produce deflection to a certain degree in transmission course, and will cause the interference to another polarization signal; For offsetting this interference, adopt the equalization filter of butterfly structure to realize polarization demultiplexing.Then remove the phase deviation that frequency deviation is brought through frequency offset estimating again, phase estimation is eliminated the phase difference that receives between signal and the local oscillations source.Through more than after several processing links, thereby recover original transmission signal by the decision device judgement.
When ONU sent upward signal to OLT, upstream rate was 10Gbps, and ONU end upward signal adopts on-off keying (OOK) modulation, and the OLT end adopts direct detection mode to receive.The local oscillator light homology of the transmitting illuminant of ONU transmitting element and receiving element, transmitter generate the OOK modulation signal of 10Gbps through electric absorption EA modulator 507.At the OLT receiving terminal; The signal of receiving directly detects through photodiode 105; Then through preposition amplification, limit put, clock recovery and judgement regeneration demodulates signal, wherein preposition amplification, limit are put, clock recovery abbreviates 3R as with regeneration, by 106 completion of 3R module.
The transmitting illuminant that the present invention proposes and the coherent reception high-speed high capacity passive optical network of local oscillator light source homology are applicable to the multiple coded system of multiple PON structure; Both can be embodied in the asymmetric PON of the up-downgoing speed system; Also can be embodied in the PON system of up-downgoing speed symmetry; And the coded system of signal do not limit, and M-PSK and M-QAM can.Below the branch situation the present invention is further described.
Fig. 3 has shown the structured flowchart of a specific embodiment of the present invention-asymmetric 40Gb/s coherent reception PM-DQPSK system.The asymmetric downstream rate that is meant is 40Gb/s, and upstream rate is 10Gb/s, and the modulation system that downstream signal adopts is PM-DQPSK, traditional OOK modulation system that upward signal adopts.During downlink data transmission, the OLT transmitting element has the signal of two-way 20Gb/s, respectively as the primary signal of two-way polarization state.Every road signal generates two-way 10Gb/s signal through serial to parallel conversion earlier, again through the difference precoding, utilizes the single channel polarization signal of the MZ modulator generation optical DQPSK of two parallel connections then.Be to realize the optical DQPSK modulation, employing be the parallel modulation mode, the MZ modulator will adopt the push-pull working method to avoid warble (Chirp).Utilize polarization beam splitting synthesizer (PBC) that the two-way polarization signal is multiplexing then, the PM-DQPSK signal that forms one road 10Gbaud transfers out.At the ONU receiving element, the signal that receives is divided into the light signal (be designated as directions X and Y direction, be different from V direction and H direction) of two orthogonal polarisation state earlier through PBS, respectively two polarised lights are carried out light coherent demodulation.Utilize 90 ° of frequency mixers and balanced reciver to accomplish the coherent reception of polarized light signal and local oscillator light signal then, local oscillator optical signals ONU end laser obtains through optical branching device.The signal of mixing output carries out opto-electronic conversion through the overbalance photoelectric detector, can obtain the signal of telecommunication of two-way homophase and quadrature.Again two path signal is sent into that ADC samples and quantification treatment, accomplished analog-to-digital conversion, obtain two-way discrete digital sequence.Then, sampling and quantize after the discrete digital sequence be admitted to the DSP device and handle.In dsp processor, digital signal is carried out clock synchronization through clock recovery, eliminates the influence of chromatic dispersion and carries out polarization demultiplexing through electric territory is balanced, estimates to eliminate local oscillator light source and the frequency difference of sending light carrier and the influence of phase noise through carrier phase.Through more than after several processing links, thereby recover original transmission signal by the decision device judgement.During transmitting uplink data, the ONU transmitting element arrives the signal loading of 10Gb/s on electric absorption (EA) modulator, carries out transferring out after on-off keying (OOK) modulation.The signal that the OLT receiving element adopts the mode demodulation of directly detection to receive.
Embodiment 2
Fig. 4 has shown the structured flowchart of another specific embodiment of the present invention-asymmetric 40Gb/s coherent reception PM-8PSK system, and a same embodiment of this embodiment is in order to explain that the present invention is common to various modulation formats.In this embodiment, our hypothesis of the signal bit rate of downlink data transmission is 42Gb/s.OLT transmitting element two-way 21Gb/s signal is respectively as the primary signal of two-way polarization state.Through the 8PSK coding, generate character rate is the 8PSK complex signal of 7Gbaud to each road signal earlier, converts the 8PSK complex signal into single channel polarization signal that the two-way real signal is loaded into the MZ modulator generation light 8PSK of two parallel connections then.Be to realize light 8PSK modulation, employing be the parallel modulation mode, the MZ modulator will adopt the push-pull working method to warble avoiding.Then utilize polarization beam splitting synthesizer (PBC) that the two-way polarization signal is multiplexing again, form one road signal and transfer out.At the ONU receiving element, the process of restituted signal is with the coherent reception PM-DQPSK system of embodiment 1, and the transmission of uplink data process is with the coherent reception PM-DQPSK system of embodiment 1.Here just do not given unnecessary details.
Embodiment 3
Fig. 5 has shown the structured flowchart of another specific embodiment of the present invention-symmetrical 40Gb/s coherent reception high-order multidimensional modulating system; The speed of up-downgoing all is 40Gb/s among this embodiment; The transmitting element of ONU and OLT all adopts PM-DQPSK to come modulation signal, to reach the purpose that reduces character rate.Because adopt the modulation of high-order multidimensional, ONU and OLT receiving element adopt the coherent reception restituted signal.Wherein the transmitting element lasing light emitter of OLT and ONU is with receiving element local oscillator lasing light emitter homology, thereby effectively controlled the cost of system.During downlink data transmission, the OLT transmitting element has the signal of two-way 20Gb/s, respectively as the primary signal of two-way polarization state.Each road 20Gb/s signal produces into two-way 10Gb/s signal through serial to parallel conversion earlier, again through the difference precoding, utilizes the optical DQPSK single channel polarization signal of the MZ modulator generation 10Gbaud of two parallel connections then.After the two-way polarization signal produces, utilize polarization beam splitting synthesizer (PBC) that the two-way polarization signal is multiplexing again, the PM-DQPSK signal that forms one road palarization multiplexing is sent into Optical Fiber Transmission and is gone out.At the ONU receiving element, the signal that receives is divided into the light signal (being designated as directions X and Y direction) of two orthogonal polarisation state earlier through PBS.Utilize 90 ° of frequency mixers and balanced reciver to accomplish the coherent reception of two-way polarization signal and local oscillation signal then, local oscillation signal is obtained through optical branching device by ONU end laser.The signal of mixing output carries out opto-electronic conversion through the overbalance photoelectric detector, can obtain the signal of telecommunication of two-way homophase and quadrature, and two path signal sends into that ADC samples and quantification treatment, the completion analog-to-digital conversion.Then, sampling and quantize after the discrete digital sequence be admitted to the DSP device and handle.In dsp processor, digital signal is carried out clock synchronization through clock recovery, eliminates the influence of chromatic dispersion and carries out polarization demultiplexing through electric territory is balanced, estimates to eliminate local oscillator light source and the frequency difference of sending light carrier and the influence of phase noise through carrier phase.Through more than after several processing links, thereby recover original transmission signal by the decision device judgement.Transmitting uplink data is the inverse process of downlink transfer, has not just given unnecessary details here.
Saidly can find out that the present invention realizes the high-speed high capacity passive optical network and the method for coherent reception from top; Through adopting the modulation of high-order multidimensional, reduced the character rate of system effectively, improved the availability of frequency spectrum; Simultaneously through adopting coherent reception and electric territory Digital Signal Processing; Improve the sensitivity of receiver and the power budget of system, and utilized the mechanism of local oscillator light source and transmitting illuminant homology, reduced the cost of system effectively.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and invention protection range of the present invention should be defined by the claims.
Claims (10)
1. high-speed high capacity passive optical network of realizing coherent reception is characterized in that said system comprises:
Optical line terminal OLT (1), main line optical fiber (2), passive optical coupler (3), branch road optical fiber (4) and at least one optical network unit ONU (5); Said optical line terminal OLT (1) is connected with said passive optical coupler (3) through said main line optical fiber (2), and said passive optical coupler (3) is connected with said at least one optical network unit ONU (5) through said branch road optical fiber (4) again; Wherein,
Said optical line terminal OLT (1) constitutes the OLT transmitting element by OLT light source (101), the first polarization beam splitting module (102), at least one multi-system optical modulator (103) and polarization coupled module (104);
Said optical network unit ONU (5) constitutes the ONU receiving element by the second polarization beam splitting module (501), ONU light source (502), the relevant frequency mixer (503) of at least one light, at least one photoelectric conversion module (504), at least one signal sampling modules A DC (505) and digital signal processor DSP (506).
2. system according to claim 1 is characterized in that, when carrying out asymmetric coherent reception, said optical network unit ONU (5) constitutes the ONU transmitting element by said ONU light source (502) and electric absorption EA modulator (507); Said optical line terminal OLT (1) constitutes the OLT receiving element by photodiode PD (105) and 3R module (106).
3. system according to claim 1; It is characterized in that; When carrying out the coherent reception of symmetry; The ONU transmitting element of said optical network unit ONU (5) is identical with the structure of said OLT transmitting element, and the OLT receiving element of said optical line terminal OLT (1) is identical with the structure of said ONU receiving element, and said ONU transmitting element and the shared said ONU light source of said ONU receiving element (502), said OLT receiving element and the shared said OLT light source of said OLT transmitting element (101).
4. realize the method for coherent reception in the high-speed high capacity passive optical network, it is characterized in that said method comprises step:
The laser that OLT light source (101) produces is divided into the light beam of the two-way polarization state quadrature of V direction and H direction through the first polarization beam splitting module (102);
Utilize the multi-system optical modulator (103) of two parallel connections to generate single channel V polarization signal and single channel H polarization signal through multilevel code;
Utilize polarization coupled module (104) to accomplish palarization multiplexing, produce the multi-system modulation signal of one road palarization multiplexing;
The multi-system modulation signal of said one road palarization multiplexing downlinks at least one optical network unit ONU (5) through branch road optical fiber (4) through main line optical fiber (2) through passive optical coupler (3) again;
The signal that ONU receives at first is divided into the light signal of the two-way orthogonal polarisation state of directions X and Y direction through the second polarization beam splitting module (501);
ONU light source (502) produces the local oscillator light signal of the needs of coherent reception;
Utilize the light frequency mixer (503) that is concerned with to accomplish the coherent reception of X, Y direction two-way polarization signal and local oscillation signal;
The be concerned with signal of frequency mixer (503) output of light carries out opto-electronic conversion through photoelectric conversion module (504), samples and quantification treatment through signal sampling modules A DC (505), accomplishes analog-to-digital conversion;
Then, the discrete digital sequence after sampling and the quantification is admitted in the digital signal processor DSP (506) and receives processing.
5. method according to claim 4 is characterized in that, receives in the said digital signal processor DSP (506) to handle to operate to comprise:
Digital signal is carried out clock synchronization through clock recovery;
Eliminate the influence of chromatic dispersion and carry out polarization demultiplexing through electric territory is balanced;
Remove the phase deviation that frequency deviation is brought through frequency offset estimating, eliminate the phase difference that receives between signal and the local oscillator light signal through phase estimation;
Through more than after several processing links, thereby recover original transmission signal by the decision device judgement.
6. method according to claim 4 is characterized in that, if carry out asymmetric coherent reception, during transmitting uplink data, the ONU transmitting element is loaded into upstream data. signals on the electric absorption EA modulator (507), carries out transferring out after the on-off keying OOK modulation; The signal that the OLT receiving element adopts the mode demodulation of directly detection to receive.
7. method according to claim 4 is characterized in that, if carry out the coherent reception of symmetry, during transmitting uplink data, adopts the inverse process of downlink transfer to transmit data from ONU to OLT.
8. method according to claim 4 is characterized in that, the concrete mode of said multilevel code is M-PSK mode or M-QAM mode.
9. method according to claim 5; It is characterized in that; Saidly carry out the clock synchronization concrete steps through clock recovery and be: the symbol sampling that utilizes interpolation filter adjustment receiver makes adjusted receiver sampling clock synchronous with the emission symbol clock constantly; Said polarization demultiplexing adopts the equalization filter of butterfly structure to realize.
10. method according to claim 7 is characterized in that, the concrete mode of said multilevel code is M-PSK mode or M-QAM mode, and multilevel code described in downlink transfer and the uplink can adopt identical or different mode to carry out.
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