CN101534154A - Error code test method of burst optical signal receiving module - Google Patents
Error code test method of burst optical signal receiving module Download PDFInfo
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- CN101534154A CN101534154A CN200910061731A CN200910061731A CN101534154A CN 101534154 A CN101534154 A CN 101534154A CN 200910061731 A CN200910061731 A CN 200910061731A CN 200910061731 A CN200910061731 A CN 200910061731A CN 101534154 A CN101534154 A CN 101534154A
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Abstract
The invention relates to an error code test method of a burst optical signal receiving module, comparing the step of comparing the frame data in the receiving frame-formatted data with the frame data in the frame-formatted data of a local code and outputting the comparison result, or comparing the step of comparing the frame data, delimiters and partial frame heads in front of the delimiters in the receiving frame-formatted data with the frame data, delimiters and partial frame heads in front of the delimiters in the frame-formatted data of the local code and outputting the comparison result. The invention compares the frame data only, or frame data, delimiters and partial frame heads in front of the delimiters to avoid the comparison of permissible error codes, thereby greatly improving the accuracy of the error code test.
Description
Technical field
The present invention relates to the error-code testing method of the test of burst optical signal receiving module, particularly burst optical signal receiving module.
Background technology
In the burst PON system that adopts the TDMA mode, each terminal use sends number being assigned in the time slot of oneself, because the distance of each user's decentre office is different, in the transmission decay of signal also different, so cause finally arriving the data phase of central office, amplitude also different.Therefore burst luminous signal has following characteristics:
A. signal amplitude is unbalanced;
B. its phase place is also unbalanced in data flow;
C., long connect " 1 " and the long appearance that connects " 0 " are arranged in the data.
Characteristics in view of burst light tdma signal, study the generation and the reception technique of burst light tdma signal, the error code testing system that just needs a special burst optical signal receiving module, be used for detecting the performance of designed burst optical signal receiving module, the error code testing system of present burst optical signal receiving module as shown in Figure 1, it comprises Error Detector FPGA able to programme, burst luminous signal generating means and the tested burst optical signal receiving module with yard type generation module and error code detection module.
The operation principle of the error code testing system of present burst optical signal receiving module is:
Sign indicating number type generation module will be launched the signal of telecommunication output of data, produce the burst luminous signal that is used to test through the burst luminous signal generating means, and this burst luminous signal should be able to meet the requirement of PON light burst transmitting element.Tested burst optical signal receiving module receives burst luminous signal, and the output signal of telecommunication is to the error code detection module of computer, and error code detection module will receive data and the emission data are all carried out the error code comparison, and the result of error code comparison is exported.
The defective of the error code testing system of present burst optical signal receiving module is:
Error code detection module will receive data and all be used as effective code element, so in comparison, directly will receive data all compares with the emission data, but in the burst transmission, the sign indicating number type is the base unit transmission with the frame, data have different frame structures in different communication systems, and frame generally can be divided into frame head and frame data two parts, frame head generally is used for the original position of marker frames, data are the effective code elements that need transmission, also have frame period between frame and the frame, frame period does not have effective code element, and being does not need to carry out the error code comparison; According to the definition of the upstream data pack arrangement of PON system, some amplitude that is used for carrying out is recovered in the lead code in the frame head, and between amplitude data recovered bit period, can allow error code, does not need comparison; Therefore, the error code testing result of the error code testing system of existing burst optical signal receiving module is very inaccurate.
Summary of the invention
Technical problem to be solved by this invention is: a kind of error code testing result is provided the error-code testing method of burst optical signal receiving module accurately.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of error-code testing method of burst optical signal receiving module, it may further comprise the steps:
Step 3, the burst luminous signal that step 2 is produced by tested burst optical signal receiving module are converted to the step of the signal of telecommunication;
Step 4, the signal of telecommunication that step 3 is obtained are separated into the step of received frame formatted data;
The local code frame format data that step 5, the frame format data that received frame formatted data and step 1 are produced generate compare and export result's step;
Above-mentioned frame format data comprise frame period, frame head and frame data successively, separate by frame period between frame and the frame, frame head be provided with delimiter at last;
Step 5 is specially:
Frame data in frame data in the received frame formatted data and the local code frame format data are compared and export result's step;
Or,
With the part frame head in the frame data in the received frame formatted data, delimiter and delimiter the place ahead respectively with local code frame format data in the part frame head in frame data, delimiter and delimiter the place ahead compare and export result's step.
In the such scheme, step 1 is specially:
The step of step 1.1, generation one tunnel frame format data;
Be separated into two path signal output in step 1.2, the frame format data with step 1.1 generation;
Step 2.1, the two path signal of respectively step 1 being exported convert the step of two ways of optical signals to;
Step 2.2, with the two ways of optical signals of step 2.1 output after the decay of different amplitudes, again two ways of optical signals is combined into the step of one road burst luminous signal;
In the such scheme, step 1 is specially:
The step of step 1.1, generation one tunnel frame format data;
Step 1.2, frame format data that step 1.1 is produced are by one road signal of telecommunication output step;
Step 2.1, one tunnel electrical signal conversion of step 1 output become the step of one road light signal;
Step 2.2, the separate optical signals of step 2.1 output become the step of two ways of optical signals;
Step 2.3, with wherein one road light signal of step 2.2 output after time-delay, again two ways of optical signals is combined into the step of one road burst luminous signal after the decay of different amplitudes;
In the such scheme, step 4 is specially:
The signal of telecommunication that step 3 obtains is synchronous, as to be separated into received frame formatted data step.
Compared with prior art, the advantage of the inventive method is:
1, the present invention can be as required only than frame data, or the part frame head in frame data and delimiter and delimiter the place ahead has avoided allowing the comparison of error code, therefore, error code testing accuracy as a result improves greatly.
2, can produce the two-way phase place burst of unbalanced (promptly comprise and long connect 0, long connect 1), to simulate in the actual PON system burst luminous signal from different user.
3, receiving element can be isolated the signal that is used to test.
Description of drawings
Fig. 1 is the structural representation of the error code testing system of existing burst optical signal receiving module
Fig. 2 is a kind of concrete structure schematic diagram of error code testing system of burst optical signal receiving module
Fig. 3 is the concrete structure schematic diagram of the error code testing system of another kind of burst optical signal receiving module
Fig. 4 is a frame format data data_out data structure schematic diagram
Fig. 5 is that sign indicating number type generation module random code type produces the state machine design flow chart
Fig. 6 is the dateout schematic diagram that sign indicating number type generation module produces
Fig. 7 is a burst receiving element work schematic diagram
Fig. 8 is the structure chart of word boundary detection module
Fig. 9 is the schematic diagram of motor synchronizing comparison mechanism
Figure 10 is the state diagram of comparison mechanism
Figure 11 is for receiving the comparison schematic diagram
Embodiment
The error code testing system of burst optical signal receiving module as shown in Figure 2, it comprises Error Detector FPGA able to programme, burst luminous signal generation unit, tested burst optical signal receiving module, the packet separating circuit with yard type generation module and error code detection module; Sign indicating number type generation module output two path signal, produce the burst luminous signal that is used to test through the burst luminous signal generating means, tested burst optical signal receiving module receives burst luminous signal, the output signal of telecommunication is given packet separating circuit, packet separating circuit is exported to error code detection module, and error code detection module is carried out the error code comparison.FPGA adopts the virtex family chip of Xilinx, and packet separating circuit is the high speed AND circuit.
Said system adopts the error-code testing method embodiment 1 of burst optical signal receiving module of the present invention, and it may further comprise the steps:
The step of step 1.1, generation one tunnel frame format data; The frame format data comprise frame period, frame head, frame data successively, and frame head and frame data are referred to as frame, separate by frame period between frame and the frame, frame head be provided with delimiter at last;
In order to simulate the characteristics of burst frame format, the form (as shown in Figure 4) of the frame of the burst test signal that sign indicating number type generation module produces, among the figure 00 representative frame at interval, AA represents lead code, FA represents delimiter, lead code and delimiter are collectively referred to as frame head again; What the PRBS representative sent is pseudo noise code, just frame data.
A:44bit lead code (acquiescence, adjustable) is used for the burst amplitude and recovers and clock recovery (symbol synchronization).Select AAAA for use here ... (10101010 ...) as lead code.Why select AAAA for use ... as lead code is because it contains abundant saltus step, helps ce circuit and recovers the clock data signal faster.
B:20bit delimiter (acquiescence, adjustable) is used for data and delimits (frame synchronization).
C: frame (bag) at interval: 8*N (N is 0 arbitrary value)
D: packet length: 8*M (M is 0 arbitrary value)
Wherein the value of N and M is according to User Defined.
Be separated into two path signal output in step 1.2, the frame format data with step 1.1 generation;
Inter-packet gap comprises two-part content, and one is the inter-packet gap of data_out0 and data_out1, and one is the inter-packet gap of data_out1 and data_out0, can be provided with respectively.
The production method of frame data:
In test macro, sign indicating number type generation module need provide the data (data_out0 and data_out1) of two-way periodic packets pattern for the test macro of back, adopts one road signal (data_out) to obtain this two paths of signals through the method that Signal Separation is divided into two paths of signals (data_out0 and data_out1).
Generate schematic diagram such as Fig. 4 of data, 00 representative frame interval among the figure, AA represents lead code, and FA represents delimiter, and lead code and delimiter are collectively referred to as frame head again; What the PRBS representative sent is pseudo noise code, just frame data.Frame 1 and frame 2 alternately send.
Produce the data_out signal, need use state machine mechanism shown in Figure 5.
1, RESET, reset mode.When being in this state, system is in and resets, if reset=1 continues to keep the RESET state; If reset=0 then enters the SEND_IDLEO state.
2、SEND_IDLEO。When being in this state, the data that data_out sends comprise the interval (00) of frame 2 and frame 1, the lead code of frame 1 (AA), the delimiter of frame 1 (FA).Ifg_cnt0 is a counter that successively decreases, and its initial value equals the length of the free time of frame 1, and the idle data of a frame 1 of the every transmission of data_out, and its value subtracts 1.As ifg_cnt0〉1 the time, still be in the SEND_IDLEO state, when ifg_cnt0＜=1, enter NextState (SEND_DATAO).
3、SEND_DATAO。When being in this state, the data that data_out sends are pseudo noise codes, just the effective code element in the frame.Frame_cnt0 is a counter that successively decreases, and its initial value equals the length of the frame data of frame 1, and the frame data of a frame 1 of the every transmission of data_out, and its value subtracts 1.As frame_cnt0〉1 the time, still be in the SEND_DATAO state, when frame_cnt0＜=1, enter SEND_IDLE1 state state.
4、SEND_IDLE1。When being in this state, the data that data_out sends comprise the interval (00) of frame 1 and frame 2, the lead code of frame 2 (AA), the delimiter of frame 2 (FA).Ifg_cnt1 is a counter that successively decreases, and its initial value equals the length of the free time of frame 2, and the idle data of a frame 2 of the every transmission of data_out, and its value subtracts 1.As ifg_cnt0〉1 the time, still be in the SEND_IDLE1 state, when ifg_cnt0＜=1, enter NextState (SEND_DATA1).
SEND_DATA1。When being in this state, the data that data_out sends are pseudo noise codes, just the effective code element in the frame.Frame_cnt1 is a counter that successively decreases, and its initial value equals the length of the frame data of frame 2, and the frame data of a frame 2 of the every transmission of data_out, and its value subtracts 1.As frame_cnt1〉1 the time, still be in the SEND_DATA1 state, when frame_cnt0＜=1, enter the SEND_IDLEO state, and the like, thereby produce the frame data that frame 1 and frame 2 alternately occur.
Sign indicating number type generation module is isolated data_out0 and data_out1 from data_out method is:
Isolate this two kinds of frame signals, can carry out AND-operation with the negate signal "～frame_div " of control signal " frame_div " and control signal respectively with data_out and isolate this two paths of signals.
That is: Data_out0=Data_out﹠amp; Frame_div
Data_out1＝Data_out&～frame_div
Here, the thinking of generation frame_div signal is the clock signal that produces a saltus step in the intersection of each frame.As shown in Figure 6:
Step 2.1, the two path signal of respectively step 1 being exported convert the step of two ways of optical signals to;
Step 2.2, with the two ways of optical signals of step 2.1 output after the decay of different amplitudes, again two ways of optical signals is combined into the step of one road burst luminous signal;
Step 3, the burst luminous signal that step 2 is produced by tested burst optical signal receiving module are converted to the step of the signal of telecommunication;
The signal of telecommunication that step 4, packet separating circuit obtain step 3 is separated into the step of received frame formatted data; Be specially:
The signal of telecommunication that step 3 obtains is synchronous, as to be separated into received frame formatted data step.
Method for synchronous:
1. symbol synchronization method
As described in Figure 7, symbol synchronization mainly is to make the data that receive and the clock synchronization of reception.This process can realize by dedicated burst CDR chip at the burst receiving element of FPGA outside.
Clock and data recovery (CDR) circuit can contain the digital signal that disturbs and shake to extract and receive the bit synchronization clock from what receive, and with this clock to this data-signal resampling, recover former data-signal with standard waveform.The clock that recovers has reached synchronously with the data that recover, and can be used as the data and the clock input of error code detection module.
When the data of each frame arrive, have only utilize a part of data (generally being lead code) to recover stable clock by clock data recovery circuit after, just carry out the data of back and compare.Because the form of the frame of the burst test signal that produces is:
A:44bit lead code (acquiescence, adjustable length)
B:20bit delimiter (acquiescence, adjustable length)
C: inter-packet gap: 8*N (N is 0 arbitrary value)
D: packet length: 8*M (M is 0 arbitrary value)
Only in the 44bit lead code, recover stable clock, just can not influence the comparison of back data.So select corresponding C DR to be only key according to designing requirement.
2. the initial localization method of valid data
This part task to find out the original position of frame data in each frame (valid data) exactly.What adopt here is that (before the frame data) insert specific location bit in frame, thereby scans the method that these special location bits find the original position of frame data at receiving unit.These location bits are exactly the said delimiter in front.
In order to realize the initial location of valid data, error code detection module should comprise a word boundary detection module, the function of word boundary detection module is to detect delimiter from the data that receive, determine the border of frame data, thereby reach the purpose of the initial location of valid data, this is the prerequisite of the carrying out that the error code comparison can be correct.The structure chart of word boundary detection module as shown in Figure 8.Can select according to delimiter is only frame data to be compared, and also the part frame head in frame data and delimiter the place ahead is compared.
Each packet that Error Detector able to programme sends is all with the lead code of 44bit and delimiter 10101111101011111010 (AFAFA) beginning of 20bit, and except this 20bit, all forbid appearance 10101111101011111010 in any one section.When 20bit10101111101011111010 passes through circuit, just export a high level through the word boundary detection module of particular design, the original position of indication frame data.
As described in Figure 8, the structure thought of this module is: data are put into register (reg) cushion, in the data of buffering, seek delimiter to determine the skew figure place of bit, can determine the original position of valid data according to this parameter, and begin the operation of data, thereby reach the purpose of the initial location of valid data from this position.
Step 5, error code detection module compare the frame format data of received frame formatted data and step 1 generation and export in the local code frame format data of error code detection module generation result's step;
The received frame formatted data comprises frame period, frame head, frame data successively, separate by frame period between frame and the frame, frame head be provided with delimiter at last;
Step 5 is specially: select
Frame data in frame data in the received frame formatted data and the local code frame format data are compared and export result's step;
Or,
With the part frame head in the frame data in the received frame formatted data, delimiter and delimiter the place ahead respectively with local code frame format data in the part frame head in frame data, delimiter and delimiter the place ahead compare and export result's step.
Comparison method:
1. comparison mechanism
After having received the pseudo noise code that sends, how obtaining original signal, to carry out the error code comparison with the pseudo noise code that receives be exactly the key of receiver module.Method before generally is to adopt the primary signal of emission as the comparison signal, but the time-delay of the signal that transmits and receives is difficult to control, and this is the problem that the error burst comparison at first will solve.
In the present invention, employing be motor synchronizing Error detection mechanism, promptly from the pseudo noise code that receives, extract the required quantity of state of local code type generator, be used for recovering original pseudo noise code as local code, compare with the data that receive.This method can be carried out remote error code testing.Schematic diagram is as shown in Figure 9:
Among the figure, local code type generation module is included in error code detection module inside, be one with a sign indicating number type generation module the same module.Data (n+2), Data (n+1), Data (n), Data (n-1) is the signal that receives successively in several cycles, Data ' (n+2), Data ' (n+1), Data ' is to make SEED value and by the data (pseudo noise code is calculated by the SEED value) of local error code detection module generation with the signal that receives (n).
What comparison was machine-processed is that state machine is realized as shown in figure 10.Link_up indication connection status among the figure, concrete workflow is as follows:
After A resets, local code type generation module is operated in Immediate Mode, promptly using the data that receive to produce expected data sign indicating number type next and that receive as the SEED value compares, if r interior data of (can set) clock cycle do not have error code continuously, then think and enter NextState (self refresh mode) by link_up=1; Otherwise then continue to operate in Immediate Mode.
B is under self refresh mode, and local code type generation module is no longer receiving data as the SEED value, but the data of own generation are used as the more SEED value of new data.Under this pattern, still desired value and reception data are compared, and begin to start error code counter, begin to carry out the error code counting.
If C detects error code in r clock cycle continuously, then think and then get back to Immediate Mode by link_up=0, carry out motor synchronizing again and detect; Otherwise still be operated in self refresh mode.
2. the comparison point is provided with
The comparison of burst has a great difference with continuous signal, and in the error burst instrument, the sign indicating number type is the base unit transmission with the frame.Frame generally can be divided into frame head and data two parts, also has frame period between frame and the frame.Frame period is without any data, and being does not need to carry out the error code comparison, is nonsensical if carry out the number of bit errors that the error code comparison obtains this time; The data division of frame must be compared; And according to the index of device under test, the position that needs in the frame head to compare also is uncertain (depending on the requirement to the figure place of valid data in the frame head).
Characteristics at burst, the present invention is directed to the frame data format that proposes among the present invention the comparison method of burst is provided, promptly from the every frame data that receive, extracting a part compares, the starting point of comparison is set to certain position (difference setting can be different as requested) in the lead code, and the terminal point of comparison is set to the terminal point of frame data.
In order to determine the border of every frame data comparison, can realize by following step.
A scans the original position on frame data border by word boundary detection circuit.
B goes out the position of the starting point that will compare by the position calculation on frame data border, and (specifically decide according to user's setting in lead code the position of this point.)
C finds the ending of every frame data by counter, as the final position of comparison.
D produces the signal cnt_en of a control error code counter counting, and starting point that step B and step C calculate and terminal point are as the hopping edge of cnt_en signal.In the border of every frame comparison data, cnt_en is a high level, and all the other moment cnt_en are low level.
The work of the State Control error code counter of E by cnt_en, when cnt_en was high level, the error code counter operate as normal was whenever compared out an error code, and the value of counter adds 1; When cnt_en was low level, the value of error code counter remained unchanged.
Like this, in the time beyond the comparison border, though the error code comparison is arranged, the value of error code counter does not increase, and is equivalent to not calculate the error code of that part of time.
The schematic diagram of concrete work as shown in figure 11, starting point (start) and terminal point (end) are underlined in the drawings.When cnt_en was high level, error code counter was just counted, and when cnt_en was low level, the value of error code counter remained unchanged.
The error code testing system of burst optical signal receiving module as shown in Figure 3, it comprises Error Detector able to programme, burst luminous signal generation unit, tested burst optical signal receiving module, the packet separating circuit with yard type generation module and error code detection module; Sign indicating number type generation module is exported one road signal of telecommunication, produce the burst luminous signal that is used to test through the burst luminous signal generating means, tested burst optical signal receiving module receives burst luminous signal, the output signal of telecommunication is given packet separating circuit, packet separating circuit is exported to error code detection module, and error code detection module is carried out the error code comparison.
Said system adopts the error-code testing method embodiment 2 of burst optical signal receiving module of the present invention basic identical with the embodiment of the invention 1, and difference only is:
The step of step 1.1, generation one tunnel frame format data;
Step 1.2, frame format data that step 1.1 is produced are by one road signal of telecommunication output step;
Step 2.1, one tunnel electrical signal conversion of step 1 output become the step of one road light signal;
Step 2.2, the separate optical signals of step 2.1 output become the step of two ways of optical signals;
Step 2.3, with wherein one road light signal of step 2.2 output after time-delay, again two ways of optical signals is combined into the step of one road burst luminous signal after the decay of different amplitudes.
Claims (4)
1, a kind of error-code testing method of burst optical signal receiving module, it may further comprise the steps:
Step 1, produce the frame format data and by signal of telecommunication output step;
Step 2, the electrical signal conversion that step 1 is exported are the step of burst luminous signal;
Step 3, the burst luminous signal that step 2 is produced by tested burst optical signal receiving module are converted to the step of the signal of telecommunication;
Step 4, the signal of telecommunication that step 3 is obtained are separated into the step of received frame formatted data;
The local code frame format data that step 5, the frame format data that received frame formatted data and step 1 are produced generate compare and export result's step;
Above-mentioned frame format data comprise frame period, frame head and frame data successively, separate by frame period between frame and the frame, frame head be provided with delimiter at last;
Step 5 is specially:
Frame data in frame data in the received frame formatted data and the local code frame format data are compared and export result's step;
Or,
With the part frame head in the frame data in the received frame formatted data, delimiter and delimiter the place ahead respectively with local code frame format data in the part frame head in frame data, delimiter and delimiter the place ahead compare and export result's step.
2, error-code testing method as claimed in claim 1, it is characterized in that: step 1 is specially:
The step of step 1.1, generation one tunnel frame format data;
Be separated into two path signal output in step 1.2, the frame format data with step 1.1 generation;
Step 2 is specially:
Step 2.1, the two path signal of respectively step 1 being exported convert the step of two ways of optical signals to;
Step 2.2, with the two ways of optical signals of step 2.1 output after the decay of different amplitudes, again two ways of optical signals is combined into the step of one road burst luminous signal;
3, error-code testing method as claimed in claim 1, it is characterized in that: step 1 is specially:
The step of step 1.1, generation one tunnel frame format data;
Step 1.2, frame format data that step 1.1 is produced are by one road signal of telecommunication output step;
Step 2 is specially:
Step 2.1, one tunnel electrical signal conversion of step 1 output become the step of one road light signal;
Step 2.2, the separate optical signals of step 2.1 output become the step of two ways of optical signals;
Step 2.3, with wherein one road light signal of step 2.2 output after time-delay, again two ways of optical signals is combined into the step of one road burst luminous signal after the decay of different amplitudes;
4, as claim 2 or 3 described error-code testing methods, it is characterized in that: step 4 is specially:
The signal of telecommunication that step 3 obtains is synchronous, as to be separated into received frame formatted data step.
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| CN101841370A (en) * | 2010-03-30 | 2010-09-22 | 深圳市云海通讯股份有限公司 | Method and device for identifying error code in digital optical fiber transmission and repeater |
| CN102098102A (en) * | 2011-02-15 | 2011-06-15 | 武汉电信器件有限公司 | Burst mode code error tester of optical module on optical line terminal in gigabit-capable passive optical network |
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| CN105141359A (en) * | 2015-09-23 | 2015-12-09 | 成都乐维斯科技有限公司 | Error code detection system applied to photoelectric communication |
| CN108242981A (en) * | 2016-12-27 | 2018-07-03 | 航天信息股份有限公司 | Device for detecting code error |
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| CN102098102A (en) * | 2011-02-15 | 2011-06-15 | 武汉电信器件有限公司 | Burst mode code error tester of optical module on optical line terminal in gigabit-capable passive optical network |
| CN102098102B (en) * | 2011-02-15 | 2015-09-30 | 武汉电信器件有限公司 | Burst mode code error tester for optical circuit terminal optical module of gigabit passive optical network |
| CN104990569A (en) * | 2015-06-26 | 2015-10-21 | 中国石油化工股份有限公司胜利油田分公司 | Instrument automatic detection and intelligent transmission system and transmission method for oil and gas production |
| CN105141359A (en) * | 2015-09-23 | 2015-12-09 | 成都乐维斯科技有限公司 | Error code detection system applied to photoelectric communication |
| CN108242981A (en) * | 2016-12-27 | 2018-07-03 | 航天信息股份有限公司 | Device for detecting code error |
| CN116055926A (en) * | 2023-04-03 | 2023-05-02 | 深圳市紫光同创电子有限公司 | Sampling method, device, equipment and storage medium for GPON uplink burst transmission data |
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