CN104253648A - Optical transmission network equipment and corresponding method - Google Patents
Optical transmission network equipment and corresponding method Download PDFInfo
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- CN104253648A CN104253648A CN201310270934.2A CN201310270934A CN104253648A CN 104253648 A CN104253648 A CN 104253648A CN 201310270934 A CN201310270934 A CN 201310270934A CN 104253648 A CN104253648 A CN 104253648A
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Abstract
The invention relates to a mapper for an optical transmission network. The mapper comprises a first ramp signal generator, a second ramp signal generator, a comparator and a regulator; the first ramp signal generator is used for receiving a client clock signal and generating a client ramp signal; the second ramp signal generator is used for receiving volume information of client data transmitted in each unit frame from the inside of the mapper via feedback and generating a transmission ramp signal; the comparator is coupled to the first ramp signal generator and the second ramp signal generator and used for generating a difference between the client ramp signal and the transmission ramp signal; the regulator is used for regulating the volume information of the client data transmitted in each unit frame according to output of the comparator; each of the client ramp signal and the transmission ramp signal includes an integer portion and a fractional portion; digits of the fractional portions are at least related to expected accuracy of the mapper and frequency of the client clock signal. The invention further provides a demapper for the optical transmission network.
Description
Technical field
The present invention relates generally to optical transport network technology, relates to especially in optical transport network for carrying out the Apparatus and method for mapping and go to map.
Background technology
In optical transport network (Optical Transport Network, OTN), two processes are comprised to the transmission of customer data, the mapping process carried out in dispensing device and carry out in receiving system remove mapping process.So-called transparent transmission is exactly try one's best complete reduction customer data and client clock signal.This is the state that all-network transmission is all wished to reach.
Traditional mapper or go mapper only by buffers store client clock signal and transmit clock signal, the two is compared, and result based on the comparison adjusts the data volume that per unit frame transmits in mapper, or reduce client clock signal based on this comparative result.
Summary of the invention
Be no matter concerning mapper or go mapper, only adopting a buffer to be used for comparing and adjust brought result is exactly that mapper or the precision of going mapper to reach are very low.In addition, this traditional approach is adopted also to be easy to introduce low frequency noise in mapping process, thus the more difficult object reaching transparent transmission.
Equipment provided by the present invention and method may be used for the OTN network of transmitting high speed client signal, due to mapper and go mapper all to have higher accuracy, therefore improve the also proper mass of client clock.In addition, due in the low-frequency jitter of going the mapping process of filtering in mapping process to introduce, the jitter and wander index fall of the client clock after reduction can reach 30%.In addition, due to the performance depending on digital circuit and clock oscillator that the solution of the present invention is lower, therefore adopt the asic chip of low cost or FPGA just can realize high-precision mapping and remove map operation.
One aspect of the present invention provides a kind of for the mapper in the transmitting apparatus of optical transport network, comprises the first ramp signal generator, for receiving client clock signal, and produces corresponding client's ramp signal; Second ramp signal generator, for the customer data amount information transmitted in feedback reception per unit frame from described mapper inside, and generation transmits ramp signal accordingly; Comparator, is coupled to described first ramp signal generator and described second ramp signal generator, for generation of the difference of described client's ramp signal and described transmission ramp signal; And adjuster, be coupled to described comparator, for the difference according to described client's ramp signal and described transmission ramp signal, the customer data amount information transmitted in described per unit frame is adjusted, and the customer data amount information transmitted in the described per unit frame after adjustment is exported to described second ramp signal generator; Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the expectation quality of described mapper and the frequency dependence of described client clock signal.
Especially, described first ramp signal generator is used for generating preliminary client's ramp signal based on described client clock signal, carries out interpolation and filtering, thus generate described client's ramp signal based on sampled clock signal to described preliminary client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency.
Especially, described second ramp signal generator is used for based on described sampled clock signal, described transmission ramp signal being increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, in wherein said per unit frame, the figure place of the customer data amount fractional part of transmission is identical with the fractional part figure place of described transmission ramp signal.
Especially, described mapper also comprises the adder be coupling between described comparator and described adjuster, for the periodic noises Signal averaging that will receive from modulation noise signal generator in the output signal of described comparator, and the signal after superposition is sent to described adjuster, the frequency of described noise signal higher than the low-pass loop bandwidth of removing mapper in described optical transport network, and lower than the low-pass loop bandwidth of described mapper.
Especially, described mapper also comprises buffer, for storing described customer data according to described client clock Signal reception; Read Controller, is coupling in the reading between described adjuster and described buffer, for adjusting the described customer data stored described buffer according to the data amount information transmitted in the described per unit frame that described adjuster receives; And expense inserter, be coupled to described buffer, for inserting overhead data to the described customer data after adjustment thus generating transmission data.
Especially, described mapper also comprises filter, is coupled to described comparator, for carrying out filtering to the output signal of described comparator; And amplifier, be coupling between described filter and described adder, for amplifying the output signal of described comparator after filtering.
Another aspect provides and a kind ofly to comprise: the first ramp signal generator for removing mapper in the receiving equipment of optical transport network, for inner through feedback reception client clock signal from the described mapper that goes, produce corresponding client's ramp signal; Second ramp signal generator, for receiving the customer data amount transmitted in per unit frame, and generation transmits ramp signal accordingly; Comparator, is coupled to described first ramp signal generator and described second ramp signal generator, for generation of the difference of described client's ramp signal and described transmission ramp signal; And be coupled to the clock oscillator of described comparator, for reducing described client clock signal according to the difference of described client's ramp signal and described transmission ramp signal, and export the described client clock signal through reduction to described first slope reflector; Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the described frequency dependence removing the expectation quality of mapper and described client clock signal.
Especially, described first ramp signal generator is used for generating preliminary client's ramp signal based on described client clock signal, carries out interpolation and filtering, thus generate described client's ramp signal based on sampled clock signal to described preliminary client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency.
Especially, described second ramp signal generator is used for based on described sampled clock signal, described transmission ramp signal being increased progressively, the described amplitude increased progressively on average arrives the customer data amount transmitted in the per unit frame in each cycle of described sampled clock signal, and in wherein said per unit frame, the figure place of the customer data amount fractional part of transmission is identical with the fractional part figure place of described transmission ramp signal.
Especially, described in go mapper also to comprise filter, be coupled to described comparator, for carrying out filtering to the difference of described client's ramp signal and described transmission ramp signal; Amplifier, is coupled to described filter and described clock oscillator, for amplifying the output signal of described comparator after filtering and sending the output signal of the described comparator through filtering and amplification to described clock oscillator; Expense and customer data extractor, for receiving transmission data, and therefrom extract the data amount information of transmission in described per unit frame and pending customer data, and sent to described second ramp signal generator; Buffer, is coupled to described expense and customer data extractor, for receiving described pending customer data, and according to the client clock signal reduced through described clock oscillator, reduces to described customer data and exports; Wherein, the bandwidth of the low-pass loop be made up of described first ramp signal generator, the second ramp signal generator, comparator, filter, amplifier, clock oscillator is 1 to 10 hertz.
An aspect of of the present present invention provides a kind of optical transport network equipment, comprise foregoing arbitrary mapper for receiving customer data and producing transmission data for transmitting on optical transport network, and foregoing arbitrary mapper that goes for receiving described transmission data and being reduced to described customer data.
Present invention also offers a kind of method for carrying out map operation in the transmitting apparatus of optical transport network, comprising: receive client clock signal, and generate corresponding client's ramp signal based on described client clock signal; Receive the customer data amount information transmitted in per unit frame, and transmit ramp signal accordingly based on the generation of this information; Through comparing the difference obtaining described client's ramp signal and described transmission ramp signal, and according to the difference of described client's ramp signal and described transmission ramp signal, the customer data amount information transmitted in described per unit frame is adjusted; Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the expectation quality of described mapper and the frequency dependence of described client clock signal.
Especially, the described step based on described client clock signal generation client ramp signal comprises: generate preliminary client's ramp signal based on described client clock signal; Based on sampled clock signal interpolation carried out to described preliminary ramp signal and carry out filtering, thus generating described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency; The step that the described customer data amount information based on transmitting in described per unit frame generates transmission ramp signal comprises: based on described sampled clock signal, described transmission ramp signal is increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, the figure place of the fractional part of the customer data amount transmitted in wherein said per unit frame is identical with the fractional part figure place of described transmission ramp signal.
Present invention also offers a kind of method of carrying out map operation in the receiving equipment of optical transport network, comprise and receive client clock signal, and generate client's ramp signal based on described client clock signal; Receive the customer data amount information transmitted in per unit frame, and transmit ramp signal accordingly based on the generation of this information; Through comparing the difference obtaining described client's ramp signal and described transmission ramp signal; And reduce described client clock signal according to the difference of described client's ramp signal and described transmission ramp signal; Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the described frequency dependence removing the expectation quality of mapper and described client clock signal.
Especially, the described step based on described client clock signal generation client ramp signal comprises: generate preliminary client's ramp signal based on described client clock signal, based on sampled clock signal, difference and filtering are carried out to described preliminary client's ramp signal, thus generate described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency in short-term; The step that the described customer data amount information based on transmitting in per unit frame produces transmission ramp signal comprises: based on described sampled clock signal, described transmission ramp signal is increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, the figure place of the fractional part of the customer data amount transmitted in wherein said per unit frame is identical with the fractional part figure place of described transmission ramp signal.
Accompanying drawing explanation
Figure 1 shows that the mapper schematic diagram in optical transport network described according to one embodiment of present invention;
Fig. 2 a and Fig. 2 b is depicted as and carries out to client's ramp signal the schematic diagram that filtering interpolation operates front and back by the mapper described in one embodiment of the invention;
Figure 3 shows that and remove mapper schematic diagram according to one embodiment of present invention described optical transport network;
Figure 4 shows that the schematic flow sheet carrying out map operation in optical transport network described according to one embodiment of present invention;
Figure 5 shows that the schematic flow sheet carrying out map operation in optical transport network described according to one embodiment of present invention; And
Figure 6 shows that the schematic diagram of optical transport network equipment described according to one embodiment of present invention.
Embodiment
Discuss manufacture and the use of the embodiment of the application below in detail.But, should be understood that, the invention provides many feasible inventive concept can implemented under various concrete background.The specific embodiment discussed is only illustrate manufacture and use concrete mode of the present invention, does not limit the scope of the invention.
Figure 1 shows that the schematic diagram of the mapper 100 according to one embodiment of the invention.Figure 4 shows that mapper 100 carries out the method flow diagram of map operation.
In step 402, client's ramp signal generator 102 receives client clock signal.Frequency due to client clock signal is general all higher than the operating frequency of digital circuit, so according to one embodiment of present invention, and the client clock signal of what client's ramp signal generator 102 received can be through frequency divider 124 frequency division.Frequency divider 124 can carry out Fractional-N frequency to client clock signal, and be such as the OTN network of 10G for client signal rate, N can equal 64.
Client's ramp signal generator 102 client ramp signal generator 102 can produce a preliminary ramp signal as shown in Figure 2 a based on client clock signal.Wherein often increase a client clock cycle, corresponding ramp signal values also adds one.Such as, the ramp signal values that the position in the 1st client clock cycle is corresponding is 1.
Client's ramp signal generator 102 can also carry out interpolation and filtering process to above-mentioned preliminary ramp signal.As shown in Figure 2 b, in client clock signal, insert sampled clock signal, the frequency of this sampled clock signal is higher than client clock signal, and especially, the frequency of this sampled clock signal is at least 3 times of client clock signal frequency.
Obtain after ramp signal values corresponding to the sampling clock cycle filter be through in client's ramp signal generator 102 carries out filtering.Like this, described preliminary ramp signal is just defining client's ramp signal after interpolation and filtering.
Client's ramp signal comprises an integer part and a fractional part.Integer part is exactly the ramp signal values corresponding to each client clock cycle, the value that fractional part obtains after being through client's ramp signal generator 102 filtering interpolation.The mapper accuracy that the figure place S of this fractional part expects according to user determines.Such as, can calculate the figure place S of fractional part according to following formula (1).Accuracy desired by supposing is 10 psecs, and the client clock signal frequency after frequency division is 19440000 hertz, should be so 13 according to the figure place S of the fractional part of the known client's ramp signal of following formula.
In step 404, the customer data amount information Cn that transmission ramp signal generator 104 can transmit in feedback reception per unit frame from mapper inside.Transmission ramp signal generator 104 makes described transmission ramp signal increase progressively based on described sampled clock signal (also can be called as transmit clock signal), and the amplitude increased progressively can by following formulae discovery
Wherein the value of S with N is identical about the value in the introduction of client's ramp signal generator with above.The ramp signal values calculated through such mode also has an integer part and a fractional part, and its fractional part figure place is also S.
In step 406, comparator 106 receives client's ramp signal from client's ramp signal generator 102, receives transmission ramp signal from transmission ramp signal generator 104, and by comparing the difference of both calculating.
In step 408, filter 108 receives client's ramp signal and the difference transmitting ramp signal from comparator 106, and carries out filtering to it.Those skilled in the art are known, and filtering operation in this step can merge into same step with filtering operation in step 402, and can not affect effect of the present invention.
In step 410, amplifier 110 receives reception client ramp signal after filtering from filter 108 and transmits the difference of ramp signal, and is amplified it.
In step 412, adjuster 112 receives the difference after filtering with the client's ramp signal amplified and transmission ramp signal, and adjusts the customer data amount Cn that per unit frame transmits according to this information.If client's ramp signal is less than transmission ramp signal, so just make Cn increase, the data of one or more bit can be added into corresponding to per unit frame; If client's ramp signal is greater than transmission ramp signal, so just make Cn reduce, the data of one or more bit can be reduced corresponding to per unit frame.
According to one embodiment of present invention, can compare client's ramp signal and transmission ramp signal at all devices of each sampling clock, once can adjust Cn at each unit frame adjuster 112.
Cn through adjustment also can be fed back to transmission ramp signal generator 104 by adjuster 112.
In step 414, Read Controller 118 from adjustment period 112 receive Cn through adjustment, and according to this information, the customer data be stored in buffer 120 to be adjusted accordingly, and sends and read enable signal.
In step 416, expense inserter 122 receives the customer data through adjustment from buffer 120, and inserts overhead data, thus the Frame that generation can be transmitted on optical transport network also claims high level data frame.
According to one embodiment of present invention, described method also comprises step 411 between step 410 and 412, adder 116 receives the high frequency noise signal of one-period from modulation noise signal generator 114, and is superimposed upon by this noise signal the difference of client's ramp signal and the transmission ramp signal received from amplifier 110.According to one embodiment of present invention, this noise signal is triangular signal.
The frequency of this noise signal, lower than the bandwidth of the low-pass loop formed by 102,104,108,110 and 112, therefore can not filter out by mapped device 100.In addition, the frequency of the low-frequency jitter that the frequency of described noise signal causes higher than the adjustment due to adjuster 112 couples of Cn, also higher than the bandwidth of removing the low-pass loop in mapper in optical transport network accordingly.
The frequency of the shake caused due to adjuster 112 is very low, is going not easily to be detected in mapper thus also not easily by filtering, the introducing of above-mentioned noise signal improves the frequency of this low-frequency jitter, thus is helping to go this shake of mapper filtering.
According to one embodiment of present invention, be successively can be carried out by one or more mapper 100 to the encapsulation of customer data.
According to test, adopt the mapper that the application provides, as mentioned above, client clock signal frequency is 19440000 hertz, when the figure place S of the fractional part of ramp signal is 13, mapper 100 can reach the accuracy of 6.28 psecs, meets the predeterminated target of 10 psecs.
Figure 3 shows that the schematic diagram removing mapper 300 according to one embodiment of the invention.Fig. 5 is for being that the mapper 300 that goes described in embodiment carries out the flow chart of map operation according to one of the present invention.
In step 502, client's ramp signal generator 302 is from going to mapper 300 inside through feedback reception client clock signal.According to one embodiment of present invention, frequency divider 318 can carry out Fractional-N frequency to client clock signal and the client clock signal after frequency division be sent to client's ramp signal generator 302.
Client's ramp signal generator 302 is identical with the client's ramp signal generator 102 in Fig. 1, can carry out interpolation and filtering to according to sampled clock signal to preliminary client's ramp signal, thus generates client's ramp signal.
In step 504, transmission ramp signal generator 304 receives the customer data amount information Cn of per unit frame transmission from buffer 316.Transmission ramp signal generator 304 is identical with the transmission ramp signal generator 104 in Fig. 1, can generate transmit ramp signal accordingly according to sampled clock signal and received Cn.
In step 506, comparator 306 receives client's ramp signal from client's ramp signal generator 302, receives transmission ramp signal from transmission ramp signal generator 304, and by comparing the difference of both calculating.
In step 508, filter 308 receives client's ramp signal and the difference transmitting ramp signal from comparator 306, and carries out filtering to it.Those skilled in the art are known, and filtering operation in this step can merge into same step with filtering operation in step 502, and can not affect effect of the present invention.
Because mapper as the aforementioned may superpose noise signal in the transmission signal, and the frequency of this noise signal is higher than going in mapper by 302,304,306,308, the bandwidth of 310 and 312 low-pass loop formed, the shake that therefore this noise signal causes together with superposition mapper thereon can be gone mapper 300 to detect and filtering.In order to reach this object, go the bandwidth of the low-pass loop of mapper 300 should to choose in the scope of 1 hertz to 10 hertz.
In step 510, amplifier 310 receives client's ramp signal after filtering from filter 308 and transmits the difference of ramp signal, and is amplified it.
In step 512, clock oscillator 312 receives the difference after filtering with the client's ramp signal amplified and transmission ramp signal, and according to this information reverting client clock signal.Clock oscillator can be numerically-controlled oscillator, also can be voltage controlled oscillator.Clock oscillator 314 by reduction after client clock signal feedback to client's ramp signal generator 302.
In step 514, expense and customer data extractor 316 receive transmission data and transmit clock signal, and therefrom extract the customer data amount information Cn of per unit frame transmission, and the pending customer data eliminating overhead data is sent to buffer 314, and Cn is sent to transmission ramp signal generator 304.
In step 516, buffer 314 to reduce to customer data according to the client clock signal received from clock oscillator 312 and exports.
According to one embodiment of present invention, successively can be carried out by one or more mapper 300 that goes the reduction of customer data and client clock signal, finally obtain the customer data that will reduce and client clock signal.
According to one embodiment of present invention, described unit frame can be single frames or multi-frame.
Fig. 6 is optical transmission device 600 described according to one embodiment of present invention, comprising the mapper 602 that communicates each other and removes mapper 604, possessing the 26S Proteasome Structure and Function identical with removing mapper 300 with aforementioned mapper 100 respectively.Optical transmission device can be multi-service convergent type wavelength shifter (Muxponder) or transmission transponder (Transponder).
Those skilled in the art are easy to just learn, can change materials and methods within the scope of the invention.Should also be understood that except for illustration of except the concrete linguistic context of embodiment, the invention provides many applicable inventive concept.Correspondingly, claims are intended to such process, machine, manufacture, material synthesis, device, method or step to be included in their scope.
Claims (15)
1., for the mapper in the transmitting apparatus of optical transport network, comprise
First ramp signal generator, for receiving client clock signal, and produces corresponding client's ramp signal;
Second ramp signal generator, for the customer data amount information transmitted in feedback reception per unit frame from described mapper inside, and generation transmits ramp signal accordingly;
Comparator, is coupled to described first ramp signal generator and described second ramp signal generator, for generation of the difference of described client's ramp signal and described transmission ramp signal; And
Adjuster, be coupled to described comparator, for the difference according to described client's ramp signal and described transmission ramp signal, the customer data amount information transmitted in described per unit frame is adjusted, and the customer data amount information transmitted in the described per unit frame after adjustment is exported to described second ramp signal generator;
Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the expectation quality of described mapper and the frequency dependence of described client clock signal.
2. mapper as claimed in claim 1, wherein said first ramp signal generator is used for generating preliminary client's ramp signal based on described client clock signal, based on sampled clock signal, interpolation and filtering are carried out to described preliminary client's ramp signal, thus generate described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency.
3. mapper as claimed in claim 2, wherein said second ramp signal generator is used for based on described sampled clock signal, described transmission ramp signal being increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, in wherein said per unit frame, the figure place of the customer data amount fractional part of transmission is identical with the fractional part figure place of described transmission ramp signal.
4. mapper as claimed in claim 1, also comprise the adder be coupling between described comparator and described adjuster, for the periodic noises Signal averaging that will receive from modulation noise signal generator in the output signal of most comparator, and the signal after superposition is sent to described adjuster, the frequency of described noise signal higher than the low-pass loop bandwidth of removing mapper in described optical transport network, and lower than the low-pass loop bandwidth of described mapper.
5. mapper as claimed in claim 1, also comprises:
Buffer, for storing described customer data according to described client clock Signal reception;
Read Controller, is coupling in the reading between described adjuster and described buffer, for adjusting the described customer data stored described buffer according to the data amount information transmitted in the described per unit frame that described adjuster receives; And
Expense inserter, is coupled to described buffer, for inserting overhead data to the described customer data after adjustment thus generating transmission data.
6. mapper as claimed in claim 4, also comprises:
Filter, is coupled to described comparator, for carrying out filtering to the output signal of described comparator; And
Amplifier, is coupling between described filter and described adder, for amplifying the output signal of described comparator after filtering.
7., for removing a mapper in the receiving equipment of optical transport network, comprising:
First ramp signal generator, for inner through feedback reception client clock signal from the described mapper that goes, produces corresponding client's ramp signal;
Second ramp signal generator, for receiving the customer data amount transmitted in per unit frame, and generation transmits ramp signal accordingly;
Comparator, is coupled to described first ramp signal generator and described second ramp signal generator, for generation of the difference of described client's ramp signal and described transmission ramp signal; And
Be coupled to the clock oscillator of described comparator, for reducing described client clock signal according to the difference of described client's ramp signal and described transmission ramp signal, and export the described client clock signal through reduction to described first slope reflector;
Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the described frequency dependence removing the expectation quality of mapper and described client clock signal.
8. remove mapper as claimed in claim 7, wherein said first ramp signal generator is used for generating preliminary client's ramp signal based on described client clock signal, based on sampled clock signal, interpolation and filtering are carried out to described preliminary client's ramp signal, thus generate described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency.
9. remove mapper as claimed in claim 8, wherein said second ramp signal generator is used for based on described sampled clock signal, described transmission ramp signal being increased progressively, the described amplitude increased progressively on average arrives the customer data amount transmitted in the per unit frame in each cycle of described sampled clock signal, and in wherein said per unit frame, the figure place of the customer data amount fractional part of transmission is identical with the fractional part figure place of described transmission ramp signal.
10. remove mapper as claimed in claim 9, also comprise
Filter, is coupled to described comparator, for carrying out filtering to the difference of described client's ramp signal and described transmission ramp signal;
Amplifier, is coupled to described filter and described clock oscillator, for amplifying the output signal of described comparator after filtering and sending the output signal of the described comparator through filtering and amplification to described clock oscillator;
Expense and customer data extractor, for receiving transmission data, and therefrom extract the data amount information of transmission in described per unit frame and pending customer data, and sent to described second ramp signal generator;
Buffer, is coupled to described expense and customer data extractor, for receiving described pending customer data, and according to the client clock signal reduced through described clock oscillator, reduces to described customer data and exports;
Wherein, the bandwidth of the low-pass loop be made up of described first ramp signal generator, the second ramp signal generator, comparator, filter, amplifier, clock oscillator is 1 to 10 hertz.
11. 1 kinds of optical transport network equipment, comprise if the mapper as described in arbitrary in claim 1 to 6 is for receiving customer data and producing the transmission data for transmitting on optical transport network, and if the described mapper that goes arbitrary in claim 7 to 10 is for transmitting data as described in receiving and customer data as described in being reduced to.
12. 1 kinds, for carrying out the method for map operation in the transmitting apparatus of optical transport network, comprising:
Receive client clock signal, and generate corresponding client's ramp signal based on described client clock signal;
Receive the customer data amount information transmitted in per unit frame, and transmit ramp signal accordingly based on the generation of this information;
Through comparing the difference obtaining described client's ramp signal and described transmission ramp signal, and according to the difference of described client's ramp signal and described transmission ramp signal, the customer data amount information transmitted in described per unit frame is adjusted;
Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the expectation quality of described mapper and the frequency dependence of described client clock signal.
13. methods as claimed in claim 12, wherein
The described step based on described client clock signal generation client ramp signal comprises:
Preliminary client's ramp signal is generated based on described client clock signal;
Based on sampled clock signal interpolation carried out to described preliminary ramp signal and carry out filtering, thus generating described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency;
The step that the described customer data amount information based on transmitting in described per unit frame generates transmission ramp signal comprises:
Based on described sampled clock signal, described transmission ramp signal is increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, the figure place of the fractional part of the customer data amount transmitted in wherein said per unit frame is identical with the fractional part figure place of described transmission ramp signal.
14. 1 kinds of methods of carrying out map operation in the receiving equipment of optical transport network, comprise
Receive client clock signal, and generate client's ramp signal based on described client clock signal;
Receive the customer data amount information transmitted in per unit frame, and transmit ramp signal accordingly based on the generation of this information;
Through comparing the difference obtaining described client's ramp signal and described transmission ramp signal; And
Described client clock signal is reduced according to the difference of described client's ramp signal and described transmission ramp signal;
Wherein, described client's ramp signal and described transmission ramp signal comprise integer part and fractional part, the figure place of described fractional part at least with the described frequency dependence removing the expectation quality of mapper and described client clock signal.
15. methods as claimed in claim 14, wherein
The described step based on described client clock signal generation client ramp signal comprises:
Generate preliminary client's ramp signal based on described client clock signal, based on sampled clock signal, difference and filtering are carried out to described preliminary client's ramp signal, thus generate described client's ramp signal; The frequency of wherein said sampled clock signal is at least 3 times of described client clock signal frequency in short-term;
The step that the described customer data amount information based on transmitting in per unit frame produces transmission ramp signal comprises:
Based on described sampled clock signal, described transmission ramp signal is increased progressively, the customer data amount of the described amplitude increased progressively on average transmitting in the per unit frame in each cycle of described sampled clock signal, the figure place of the fractional part of the customer data amount transmitted in wherein said per unit frame is identical with the fractional part figure place of described transmission ramp signal.
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| CN102142862A (en) * | 2009-12-04 | 2011-08-03 | 英特尔公司 | Chaotic wide band frequency modulator for noise reduction |
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