CN107786311A - Device for detecting code error - Google Patents
Device for detecting code error Download PDFInfo
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- CN107786311A CN107786311A CN201610729974.2A CN201610729974A CN107786311A CN 107786311 A CN107786311 A CN 107786311A CN 201610729974 A CN201610729974 A CN 201610729974A CN 107786311 A CN107786311 A CN 107786311A
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- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 230000005611 electricity Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/203—Details of error rate determination, e.g. BER, FER or WER
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- Tests Of Electronic Circuits (AREA)
Abstract
The present invention discloses a kind of device for detecting code error, including code error tester, optical module, signal level change-over panel, signal level change-over panel includes the first signal level shift circuit and secondary signal level shifting circuit, the input of first signal level shift circuit is TTL/LVTTL level, export as CML/PECL level, the input of secondary signal level shifting circuit is CML/PECL level, export as TTL/LVTTL level, code error tester connects the output of the first signal level shift circuit and the input of secondary signal level shifting circuit, optical module connects the input of the first signal level shift circuit and the output of secondary signal level shifting circuit.The present invention supports the output and input level of tested optical module to be converted to TTL/LVTTL level, is matched with code error tester using the normal performance for not influenceing code error tester.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of device for detecting code error.
Background technology
Code error tester is the essential equipment of optical module communication test, various each with the continuous development of optical module
The code error tester of sample occurs commercially.Existing Error Detector from several million or even 10G Error Detector be all CML level or PECL
Level, it is not directed to the code error tester of TTL/LVTTL level.
The content of the invention
The present invention is intended to provide a kind of device for detecting code error, it would be preferable to support be converted to code error tester output and input level
TTL/LVTTL level, and the change-over panel is matched with code error tester using the normal performance for not influenceing code error tester.
To reach above-mentioned purpose, the present invention is realized using following technical scheme：
Device for detecting code error disclosed by the invention, including code error tester, optical module, signal level change-over panel, the letter
Number level conversion plate includes the first signal level shift circuit and secondary signal level shifting circuit, and first signal level turns
The input for changing circuit is TTL/LVTTL level, output is CML/PECL level, the input of the secondary signal level shifting circuit
It is TTL/LVTTL level for CML/PECL level, output, the code error tester connects the defeated of the first signal level shift circuit
Go out the input with secondary signal level shifting circuit, the optical module connects the input and second of the first signal level shift circuit
The output of signal level shift circuit.
Preferably, first signal level shift circuit includes integrated circuit MAX3747, the integrated circuit
MAX3747 1 pin connection resistance R13 one end, resistance R14 one end, resistance R13 other end connection integrated circuit
MAX3747 7 pin, resistance R26 one end, resistance R26 other end ground connection；Integrated circuit MAX3747 2 pin connection R21's
One end, electric capacity C17 one end, the electric capacity C17 other end connection inductance L2 one end, electric capacity C18 one end, inductance L2's is another
End ground connection, integrated circuit MAX3747 3 pin connection resistance R20 one end, electric capacity C19 one end, the electric capacity C19 other end connect
Inductance L3 one end, the electric capacity C18 other end is connect, the inductance L3 other end connects resistance R18 one end, resistance R19 one end,
The output end of the TTL/LVTTL level signals of resistance R18 other end connection optical module, resistance R19 other end ground connection；It is integrated
Circuit MAX3747 4 pin connection resistance R23 one end, the resistance R20 other end, the resistance R21 other end, the one of electric capacity C22
End, electric capacity C23 one end, the electric capacity C22 other end, electric capacity C23 other end ground connection, resistance R23 other end connection resistance
R27 one end, integrated circuit MAX3747 5 pin, resistance R27 other end connection positive source, shunt capacitance on resistance R23
C21；Integrated circuit MAX3747 6 pin ground connection；Integrated circuit MAX3747 7 pin connecting luminous diode LED3 negative electrode, hair
Optical diode LED3 anode connection resistance R28 one end, resistance R28 other end connection positive source；Integrated circuit
MAX3747 8 pin connection resistance R17 one end, resistance R22 one end, electric capacity C20 one end, resistance R22 another termination
Ground, the electric capacity C20 other end connection inverting input of code error tester, resistance R24 one end, resistance R25 one end, resistance
R24 another termination positive source, resistance R25 other end ground connection；Integrated circuit MAX3747 9 pin connection resistance R17's is another
One end, resistance R12 one end, electric capacity C16 one end, resistance R12 other end ground connection, electric capacity C16 other end connection error code
The in-phase input end of tester, resistance R10 one end, resistance R11 one end, resistance R11 another termination positive source, resistance
R10 other end ground connection；Integrated circuit MAX3747 10 pin connection positive source.
Further, the integrated circuit MAX3747 is provided with decoupling capacitor C15.
Further, connect 0 Ohmic resistance R15 between the other end and ground of the inductance L2, and the inductance L3's is another
End and the 0 Ohmic resistance R19 that connected between ground.
Preferably, the secondary signal level shifting circuit includes integrated circuit UX2103, the integrated circuit UX2103
1,2 pin between shunt capacitance C7；Integrated circuit UX2103 3 pin ground connection；Integrated circuit UX2103 4 pin connection resistance R5's
One end, electric capacity C10 one end, the in-phase output end of electric capacity C10 other end connection code error tester, electric capacity C11 one end；Collection
One end of the other end, electric capacity C12 into circuit U X2103 5 pin connection resistance R5, electric capacity C12 other end connection error code testing
Reversed-phase output, the electric capacity C11 other end of instrument；Integrated circuit UX2103 6 pin connection positive source, electric capacity C14 one end；
The integrated circuit UX2103 7 pin connection electric capacity C14 other end；Integrated circuit UX2103 8 pin connection resistance R8 one end, electricity
Hinder R9 one end, resistance R8 other end ground connection；The integrated circuit UX2103 9 pin connection resistance R9 other end, resistance R7
One end, the negative electrode of LED 2, the anode connection resistance R6 of LED 2 one end, resistance R6's is another
End, the resistance R7 other end are all connected with positive source；Integrated circuit UX2103 11 pin ground connection；Integrated circuit UX2103 13 pin
Connection resistance R3 one end, the input of the TTL/LVTTL level signals of optical module, resistance R3 other end connection power supply is just
Pole；Integrated circuit UX2103 14 pin connection positive source；Integrated circuit UX2103 16 pin connection resistance R2 one end, resistance
R2 other end ground connection.
Further, the 14 pin connection electric capacity C9 of integrated circuit UX2103 one end, electric capacity C9 other end ground connection；
Integrated circuit UX2103 15 pin connection electric capacity C8 one end, electric capacity C8 other end ground connection.
Further, the 6 pin connection electric capacity C13 of integrated circuit UX2103 one end, electric capacity C13 another termination
Ground.
Further, one end by 0 Ohmic resistance R4 connection resistance R3 of 13 pin of the integrated circuit UX2103, optical mode
The input of the TTL/LVTTL level signals of block.
The operation principle of the present invention is as follows：CML the or PECL level conversions of input are TTL/ by signal level change-over panel
LVTTL signal levels export；The TTL/LVTTL signal levels of input are converted into the output of CML or PECL level；When signal is changed
When plate supply voltage is 5V, output level is Transistor-Transistor Logic level；When supply voltage is 3.3V, output level is LVTTL level.
Beneficial effects of the present invention are as follows：
1st, signal level change-over panel of the invention, supports that conventional code error tester CML and PECL level conversions are TTL/
LVTTL signal levels, meet the error rate test of TTL/LVTTL level optical modules；
2nd, all integrated circuits in the present invention can support 1.25Gbps speed, so as to be supported in speed
50Mbps, the Transistor-Transistor Logic level Error Detector speed than existing maximum 2Mbps improve a lot；
3rd, signal level change-over panel of the invention, the matching that can be compatible with all code error testers in existing market use；
4th, cost of the present invention is very low, practical and convenient, and compatibility is strong.
Brief description of the drawings
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the schematic diagram of the first signal level shift circuit；
Fig. 3 is the schematic diagram of secondary signal level shifting circuit.
Fig. 4 is the output waveform figure of the LVTTL level of test signal level change-over panel under 5Mbps speed；
Fig. 5 is the output waveform figure of the LVTTL level of test signal level change-over panel under 20Mbps speed；
Fig. 6 is the output waveform figure of the LVTTL level of test signal level change-over panel under 60Mbps speed.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.
As shown in figure 1, device for detecting code error disclosed by the invention, including the conversion of code error tester, optical module, signal level
Plate, signal level change-over panel include the first signal level shift circuit and secondary signal level shifting circuit, the first signal level
The input of change-over circuit be TTL/LVTTL level, output be CML/PECL level, the secondary signal level shifting circuit it is defeated
It is TTL/LVTTL level to enter for CML/PECL level, output, and code error tester connects the output of the first signal level shift circuit
With the input of secondary signal level shifting circuit, optical module connects input and the secondary signal electricity of the first signal level shift circuit
The output of flat change-over circuit.
As shown in Fig. 2 the first signal level shift circuit includes integrated circuit MAX3747, the 1 of integrated circuit MAX3747
Pin connection resistance R13 one end, resistance R14 one end, resistance R13 other end connection integrated circuit MAX3747 7 pin, electricity
Hinder R26 one end, resistance R26 other end ground connection；Integrated circuit MAX3747 2 pin connection R21 one end, the one of electric capacity C17
End, the electric capacity C17 other end connection inductance L2 one end, electric capacity C18 one end, inductance L2 other end ground connection, integrated circuit
MAX3747 3 pin connection resistance R20 one end, electric capacity C19 one end, electric capacity C19 other end connection inductance L3 one end,
The electric capacity C18 other end, the inductance L3 other end connection resistance R18 one end, resistance R19 one end, the resistance R18 other end
Connect the output end of the TTL/LVTTL level signals of optical module, resistance R19 other end ground connection；The 4 of integrated circuit MAX3747
Pin connection resistance R23 one end, the resistance R20 other end, the resistance R21 other end, electric capacity C22 one end, the one of electric capacity C23
End, the electric capacity C22 other end, electric capacity C23 other end ground connection, resistance R23 other end connection resistance R27 one end, integrate
Circuit MAX3747 5 pin, resistance R27 other end connection positive source, shunt capacitance C21 on resistance R23；Integrated circuit
MAX3747 6 pin ground connection；Integrated circuit MAX3747 7 pin connecting luminous diode LED3 negative electrode, LED 3
Anode connection resistance R28 one end, resistance R28 other end connection positive source；Integrated circuit MAX3747 8 pin connection
Resistance R17 one end, resistance R22 one end, electric capacity C20 one end, resistance R22 other end ground connection, the electric capacity C20 other end
Connect the inverting input of code error tester, resistance R24 one end, resistance R25 one end, resistance R24 another termination power
Positive pole, resistance R25 other end ground connection；The integrated circuit MAX3747 9 pin connection resistance R17 other end, the one of resistance R12
End, electric capacity C16 one end, resistance R12 other end ground connection, the homophase input of electric capacity C16 other end connection code error tester
End, resistance R10 one end, resistance R11 one end, resistance R11 another termination positive source, resistance R10 other end ground connection；
Integrated circuit MAX3747 10 pin connection positive source；The integrated circuit MAX3747 is provided with decoupling capacitor C15；Inductance L2's
Connected between the other end and ground 0 Ohmic resistance R15, the inductance L3 the other end and ground between connect 0 Ohmic resistance R19.
As shown in figure 3, secondary signal level shifting circuit includes integrated circuit UX2103,1, the 2 of integrated circuit UX2103
Shunt capacitance C7 between pin；Integrated circuit UX2103 3 pin ground connection；Integrated circuit UX2103 4 pin connection resistance R5 one end,
Electric capacity C10 one end, the in-phase output end of electric capacity C10 other end connection code error tester, electric capacity C11 one end；Integrated electricity
The road UX2103 5 pin connection resistance R5 other end, electric capacity C12 one end, electric capacity C12 other end connection code error tester
The other end of reversed-phase output, electric capacity C11；Integrated circuit UX2103 6 pin connection positive source, electric capacity C14 one end；It is integrated
The circuit U X2103 7 pin connection electric capacity C14 other end；Integrated circuit UX2103 8 pin connection resistance R8 one end, resistance R9
One end, resistance R8 the other end ground connection；The integrated circuit UX2103 9 pin connection resistance R9 other end, resistance R7 one end,
The negative electrode of LED 2, the anode connection resistance R6 of LED 2 one end, resistance the R6 other end, resistance
The R7 other end is all connected with positive source；Integrated circuit UX2103 11 pin ground connection；Integrated circuit UX2103 13 pin connection electricity
Resistance R3 one end, the input of the TTL/LVTTL level signals of optical module, resistance R3 other end connection positive source；It is integrated
Circuit U X2103 14 pin connection positive source；Integrated circuit UX2103 16 pin connection resistance R2 one end, resistance R2's is another
One end is grounded；Integrated circuit UX2103 14 pin connection electric capacity C9 one end, electric capacity C9 other end ground connection；Integrated circuit
UX2103 15 pin connection electric capacity C8 one end, electric capacity C8 other end ground connection；Integrated circuit UX2103 6 pin connection electric capacity
C13 one end, electric capacity C13 other end ground connection；Integrated circuit UX2103 13 pin can also pass through 0 Ohmic resistance R4 connections electricity
Resistance R3 one end, the input of the TTL/LVTTL level signals of optical module.
As shown in Fig. 4, Fig. 5, Fig. 6, actual test LVTTL level of the signal level change-over panel under a variety of transmission rates
Output waveform figure, it is normal to can be seen that the indices of signal from above-mentioned output waveform figure, meets requirement.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and deformation can be made according to the present invention by knowing those skilled in the art
The protection domain of appended claims of the invention should all be belonged to.
Claims (8)
1. device for detecting code error, it is characterised in that：Including code error tester, optical module, signal level change-over panel, the signal electricity
Flat change-over panel includes the first signal level shift circuit and secondary signal level shifting circuit, the first signal level conversion electricity
The input on road is TTL/LVTTL level, output is CML/PECL level, and the input of the secondary signal level shifting circuit is
CML/PECL level, output are TTL/LVTTL level, and the code error tester connects the output of the first signal level shift circuit
With the input of secondary signal level shifting circuit, the optical module connects input and the second letter of the first signal level shift circuit
The output of number level shifting circuit.
2. device for detecting code error according to claim 1, it is characterised in that：First signal level shift circuit includes
Integrated circuit MAX3747, the integrated circuit MAX3747 1 pin connection resistance R13 one end, resistance R14 one end, resistance
R13 other end connection integrated circuit MAX3747 7 pin, resistance R26 one end, resistance R26 other end ground connection；Integrated electricity
Road MAX3747 2 pin connection R21 one end, electric capacity C17 one end, electric capacity C17 other end connection inductance L2 one end, electricity
Hold C18 one end, inductance L2 other end ground connection, integrated circuit MAX3747 3 pin connection resistance R20 one end, electric capacity C19
One end, electric capacity C19 other end connection inductance L3 one end, the electric capacity C18 other end, inductance L3 other end connection resistance
R18 one end, resistance R19 one end, the output end of the TTL/LVTTL level signals of resistance R18 other end connection optical module,
Resistance R19 other end ground connection；Integrated circuit MAX3747 4 pin connection resistance R23 one end, resistance the R20 other end, electricity
Hinder the R21 other end, electric capacity C22 one end, electric capacity C23 one end, the electric capacity C22 other end, electric capacity C23 another termination
Ground, resistance R23 other end connection resistance R27 one end, integrated circuit MAX3747 5 pin, resistance R27 other end connection
Positive source, shunt capacitance C21 on resistance R23；Integrated circuit MAX3747 6 pin ground connection；Integrated circuit MAX3747 7 pin connect
Sending and receiving optical diode LED3 negative electrode, the anode connection resistance R28 of LED 3 one end, the resistance R28 other end
Connect positive source；Integrated circuit MAX3747 8 pin connection resistance R17 one end, resistance R22 one end, the one of electric capacity C20
End, resistance R22 other end ground connection, the inverting input of electric capacity C20 other end connection code error tester, the one of resistance R24
End, resistance R25 one end, resistance R24 another termination positive source, resistance R25 other end ground connection；Integrated circuit
The MAX3747 9 pin connection resistance R17 other end, resistance R12 one end, electric capacity C16 one end, resistance R12 another termination
Ground, the electric capacity C16 other end connection in-phase input end of code error tester, resistance R10 one end, resistance R11 one end, resistance
R11 another termination positive source, resistance R10 other end ground connection；Integrated circuit MAX3747 10 pin connection positive source.
3. device for detecting code error according to claim 2, it is characterised in that：The integrated circuit MAX3747 is provided with decoupling
Electric capacity C15.
4. device for detecting code error according to claim 2, it is characterised in that：Gone here and there between the other end and ground of the inductance L2
Join the 0 Ohmic resistance R19 that connects between 0 Ohmic resistance R15, the inductance L3 other end and ground.
5. according to the device for detecting code error described in claim 1,2,3 or 4, it is characterised in that：The secondary signal level conversion
Shunt capacitance C7 between 1,2 pin of the circuit including integrated circuit UX2103, the integrated circuit UX2103；Integrated circuit UX2103
3 pin ground connection；Integrated circuit UX2103 4 pin connection resistance R5 one end, electric capacity C10 one end, the electric capacity C10 other end connect
Connect in-phase output end, electric capacity C11 one end of code error tester；The integrated circuit UX2103 5 pin connection resistance R5 other end,
Electric capacity C12 one end, reversed-phase output, the electric capacity C11 other end of electric capacity C12 other end connection code error tester；It is integrated
Circuit U X2103 6 pin connection positive source, electric capacity C14 one end；Integrated circuit UX2103 7 pin connection electric capacity C14's is another
One end；Integrated circuit UX2103 8 pin connection resistance R8 one end, resistance R9 one end, resistance R8 other end ground connection；It is integrated
The circuit U X2103 9 pin connection resistance R9 other end, resistance R7 one end, the negative electrode of LED 2, light-emitting diodes
Pipe LED2 anode connection resistance R6 one end, resistance the R6 other end, the resistance R7 other end are all connected with positive source；It is integrated
Circuit U X2103 11 pin ground connection；Integrated circuit UX2103 13 pin connection resistance R3 one end, the TTL/LVTTL electricity of optical module
The input of ordinary mail number, resistance R3 other end connection positive source；Integrated circuit UX2103 14 pin connection positive source；Collection
Into circuit U X2103 16 pin connection resistance R2 one end, resistance R2 other end ground connection.
6. device for detecting code error according to claim 5, it is characterised in that：The 14 pin connection of the integrated circuit UX2103
Electric capacity C9 one end, electric capacity C9 other end ground connection；Integrated circuit UX2103 15 pin connection electric capacity C8 one end, electric capacity C8's
The other end is grounded.
7. device for detecting code error according to claim 5, it is characterised in that：The 6 pin connection of the integrated circuit UX2103
Electric capacity C13 one end, electric capacity C13 other end ground connection.
8. device for detecting code error according to claim 5, it is characterised in that：13 pin of the integrated circuit UX2103 pass through
0 Ohmic resistance R4 connection resistance R3 one end, the input of the TTL/LVTTL level signals of optical module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610729974.2A CN107786311A (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610729974.2A CN107786311A (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
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| Publication Number | Publication Date |
|---|---|
| CN107786311A true CN107786311A (en) | 2018-03-09 |
Family
ID=61438720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610729974.2A Pending CN107786311A (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
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| Country | Link |
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| CN (1) | CN107786311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070398A (en) * | 2021-12-07 | 2022-02-18 | 深圳市星芯顶科技有限公司 | Wiring-free error code testing system |
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| CN114070398A (en) * | 2021-12-07 | 2022-02-18 | 深圳市星芯顶科技有限公司 | Wiring-free error code testing system |
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Application publication date: 20180309 |