CN2552009Y - Network cable fault measurer - Google Patents
Network cable fault measurer Download PDFInfo
- Publication number
- CN2552009Y CN2552009Y CN 01276663 CN01276663U CN2552009Y CN 2552009 Y CN2552009 Y CN 2552009Y CN 01276663 CN01276663 CN 01276663 CN 01276663 U CN01276663 U CN 01276663U CN 2552009 Y CN2552009 Y CN 2552009Y
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- network cable
- measuring instrument
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Abstract
The utility model relates to a network cable fault measurer, which consists of a CPU, a multi-path switch, a battery low voltage indicating circuit, a light emitting diode, a selecting switch, a capacitance array, and a RJ45 socket. The utility model can measure errors such as short circuit, open circuit, reverse connection and line break of a shielding layer between the same line pair in twisted-pair cables, and can judge the short and wrong connection errors between different line pairs. The utility model has the special function of detecting the wrong twisted error of the twisted-pair cables so as to guarantee the communication quality of the network. Furthermore, the utility model has dynamic debugging function so as to gradually detect and display the sorts of the error of each line pair and guide the project staff to rapidly eliminate the error. The utility model not only can be used for measuring the symmetric cables, but also can be used for measuring the asymmetric cables, so the utility model is a useful tool in the cable distributing and maintenance work of the communication networks such as LAN, ISDN and ADSL and so on.
Description
Affiliated technical field
The utility model relates to the surveying instrument of a kind of Measurement Network with twisted-pair cable.
Background technology
The twisted-pair cable that is used for communication networks such as LAN (Local Area Network), ISDN, ADSL is made of 4 pairs of twisted-pair feeders that have RJ45 type 8 core interfaces, and the 1-2 of RJ45 interface, 3-6,4-5,7-8 terminal respectively connect a pair of twisted-pair feeder.Each corresponding wiring terminal of necessary each the end of a thread of strict guarantee cable and RJ45 interface plug is symmetrical one by one when wiring, installation; Any short circuit mustn't take place, and opens circuit, misconnection, reversal connection (connecing instead) with a pair of line two ends terminal, wrong strand faults such as (line are to separating), otherwise network just can't normally use, some cable also has screen layer, this just to check also whether shielding good.Therefore, must be before cable is using through detecting.Therefore, in wiring, maintenance process, must adopt special-purpose cable measuring instrument that this cable is detected.
Present known network cable measuring instrument can be judged in the twisted-pair cable each to whether there being the fault of short circuit, open circuit, reversal connection between two lines of line, and the fault that whether breaks of screen layer.But can't judge different to faults such as the short circuit between the line, misconnection.Can not judge the fault of a kind of by name " wrong strand ", " wrong strand " be exactly have in the twisted-pair cable two pairs of lines two ends connection terminal simultaneously wrong (exchange mutually) line separately cause, as shown in Figure 2." wrong strand " can cause that transmission performance descends, the circuit various problems such as increase of crosstalking.But, be the same owing to there is the direct current characteristic of the cable of this fault with normal cable, can't find with general measurement means, so it is a key factor that causes circuit hidden danger, influences communication quality.
Except symmetric cable, also have a class broad-spectrum " cross spider ", there are two pairs of lines to intersect in its four pairs of twisted-pair feeders, be called cross spider, see Fig. 4; Existing network cable measuring instrument also can't be measured cross spider.
Summary of the invention
The purpose of this utility model is to provide a kind of cable measuring instrument that is used to measure twisted-pair cable, and it both can measure the symmetry cable, also can be used to measure cross cable; Both can measure the shield type cable, also can measure non-shield type cable; It can judge same line in the twisted-pair cable between the fault of short circuit, broken string, reversal connection and so on, can also judge not collinear between short circuit, misconnection, the fault of wrong strand.It also has the dynamic debugging function, one by one display line check numbers, failure mode, guide the engineering staff promptly to fix a breakdown.It also has the device of pilot cell low-voltage, in battery electric power will exhaust, can remind the user to change battery.The technical scheme that its technical matters that solves the utility model adopts is:
Complete machine is made of main frame and distal component two parts; Main frame is electrically connected in proper order by CPU, multi-way switch, battery low-voltage indicating circuit, light emitting diode matrix, selector switch, pushbutton switch, electric resistance array, RJ45 socket; Distal component is made up of diode, resistance and RJ45 interface; Be connected measured twisted-pair cable between main frame and the distal component, when judging " wrong strand ", multi-way switch selects in two pairs of lines one as A/D conversion incoming line, and its excess-three bar line is respectively as the excitation line, the size of its A/D conversion value relatively, thus the whether judgement of " wrong strand " made.
The beneficial effects of the utility model are: it can judge same line between the fault of short circuit, broken string, reversal connection and so on, can also judge not collinear between short circuit, misconnection, both can measure the symmetry cable, also can measure cross cable; Both can measure the shield type cable, also can measure non-shield type cable; It can judge the mistake strand fault in the twisted-pair cable effectively.It also has the dynamic debugging function, can demonstrate the number and the failure mode of defective pair one by one, guides the engineering staff promptly to fix a breakdown.It also has the device of pilot cell low-voltage, in battery electric power will exhaust, can remind the user to change battery.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified (with reference to appended drawing).
Fig. 1 is an electrical schematic diagram of the present utility model, and wherein dotted line institute frame is a functional part.
Fig. 2 is the twisted-pair cable of wrong strand fault
Fig. 3 is normal " cross spider "
Among Fig. 1: A is a distal component; B is a main frame; C is tested cable.
Distal component [9] is made up of diode, resistance and a RJ45 socket.
Complete machine by 1, CPU 2, multi-way switch 3, battery low-voltage indicating circuit 4, light emitting diode 5, selector switch 6, pushbutton switch 7, electric resistance array 8, RJ45 socket 9, distal component etc. form,
Main frame links to each other with tested cable by the RJ45 joint respectively with distal component during detection streamer.Pushbutton switch (6) one is pressed, and CPU starts working.It sequentially sends test pulse to a line in the line by electric resistance array (7) to RJ45 connector (8) to each, by the signal that measuring terminals RJ45 joint (9) returns, can judge cable and whether have faults such as short circuit, open circuit, dislocation, tune.Test result is shown by light emitting diode (4).When multi-way switch (2) is used to carry out the judgement of mistake strand, select suitable wire size to change incoming line as A/D, so that judge the fault that whether has wrong strand, selector switch (5) is used to switch the kind of measured cable.Supplying cell voltage drops to when being not enough to the holding circuit operate as normal, and battery low-voltage indicating circuit (3) can send the low-voltage indicator signal,
Figure 1 shows that the circuit theory diagrams of embodiment.
CPU in the present embodiment (1) adopts the PIC16C712 single-chip microcomputer; Multi-way switch (2) is selected 74HC4351 for use, and battery low-voltage indicating circuit (3) adopts HT7039A; Light emitting diode (4) has 9, and wherein LED-G1～4 are green, is used to represent that 1-2,3-6, each line of 4-5,7-8 are right; LED-R5 and LED-R1～4 are red, are respectively applied for to show battery low-voltage state and short circuit, wrong line, reversal connection and wrong strand; Selector switch (5) is the single-pole double-throw (SPDT) toggle switch, is used to select the kind of measured cable; Pushbutton switch (6) is a touch-switch, is used to start the process of measurement of instrument; Complete machine is by the 6V powered battery.CPU is in dormant state at ordinary times, and when pushbutton switch (6) when pressing, complete machine begins to judge by following order whether measured cable exists fault:
The judgement of one, short circuit, broken string, reversal connection:
CPU RB2, RB4, RB6, RA0, RA1 port earlier is set to output port, and sequentially sends the high level test pulse by reaching electric resistance array (7) to 2,6,5,8 terminals and the shell (screen layer) of interface (8) successively; Be sent to terminator (C) through D2, R26 by tested cable; D3, R27; D4, R28; D5, R29; D6, D7, R28, R26, again by 1,3,4, No. 8 terminal, screen layer, RJ45 interface (9), measured cable (B) also passes back to the RB1 of CPU, RB3, RB5 by electric resistance array (7), the RB7 port, carry out A/D conversion by potential state, and the A/D transformation result is filed, can know that whether the 1-2 line to existing the fault of short circuit, broken string, reversal connection the RB1 port.Similarly, by knowing that to the judgement of RB3, RB5, RB7 port potential state whether 3-6,4-5,7-8 line to existing the fault of short circuit, broken string, reversal connection.When the RA1 mouth sends high level signal, detect the potential state of RB1 and RB5 mouth simultaneously and can judge whether screen layer is good.
With similar method can judge outlet between the fault of misconnection and short circuit.
Two, the judgement of wrong strand:
Select a line in two pairs of lines to change incoming line by multidiameter option switch (2) as A/D, on remaining three lines, provide the level of drive signal of jumping respectively, the electric signal that induces by distributed capacitance between line is carried out the A/D conversion, 3 data of gained are compared in twos; Numerical value is judged to be the hinge joint state greatly and above a certain numerical value person.
Three, dynamic debugging:
Press the button switch (6) and make it to keep more than 2 seconds, this device just enters the dynamic debugging state, according to 1-2, and 3-6,4-5, each line of 7-8 sequential testing is right, if fault is arranged, then stops, and shows failure mode; After disposing, pending fault just proceeds next step detection again.
Four, battery low-voltage alarm:
IC3 is battery voltage monitoring special IC HT7039A, when cell voltage is lower than 3.9V, and its output terminal output low level signal, LED-R5 is luminous.The expression cell voltage has passed through low, needs to change.
Five, the measurement of dissimilar twisted-pair cables:
Selector switch (5) is in order to select dissimilar twisted-pair cables, and it is to disconnect when measuring symmetry cable (as the T568A/B cable); When measuring the cross cable of asymmetry, selector switch is connected, and the RA3 port of CPU receives high level signal, and just with RB1 and RB3, RB2 and RB4 port are provided with exchange.Thereby original process of measurement is finished the measurement to the asymmetry cable.
Six, shutdown automatically:
Press pushbutton switch, just start test procedure one time, after all test procedure is finished.Complete machine changes holding state (shutdown automatically) over to.Whole test process is lasted 12 seconds.
Claims (7)
1. network cable measuring instrument, be made of main frame and distal component two parts, it is characterized in that: main frame is electrically connected in proper order by CPU, multi-way switch, battery low-voltage indicating circuit, light emitting diode matrix, selector switch, pushbutton switch, electric resistance array, RJ45 socket; Distal component is made up of diode, resistance and RJ45 interface; Be connected measured twisted-pair cable between main frame and the distal component, when judging " wrong strand ", multi-way switch [2] selects in two pairs of lines one as A/D conversion incoming line, and its excess-three bar line is respectively as the excitation line, the size of its A/D conversion value relatively, thus the whether judgement of " wrong strand " made.
2. network cable measuring instrument according to claim 1 is characterized in that CPU adopts the PIC16C712 single-chip microcomputer.
3. network cable measuring instrument according to claim 1 is characterized in that multi-way switch adopts 74HC4351.
4. network cable measuring instrument according to claim 1 is characterized in that the battery low-voltage indicating circuit is made of HT7039A.
5. network cable measuring instrument according to claim 1 is characterized in that having on the main frame 9 light emitting diodes; 5 redness wherein, 4 greens.
6. network cable measuring instrument according to claim 1 is characterized in that main frame and distal component are installed in respectively in two the plastic casing; They respectively have a RJ45 socket, are used to connect measured cable.
7. network cable measuring instrument according to claim 1 is characterized in that selector switch adopts toggle switch, and when measuring the symmetry cable, it disconnects, and when measuring the asymmetry cross cable, it is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01276663 CN2552009Y (en) | 2001-12-26 | 2001-12-26 | Network cable fault measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01276663 CN2552009Y (en) | 2001-12-26 | 2001-12-26 | Network cable fault measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2552009Y true CN2552009Y (en) | 2003-05-21 |
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ID=33680695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01276663 Expired - Fee Related CN2552009Y (en) | 2001-12-26 | 2001-12-26 | Network cable fault measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2552009Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419442C (en) * | 2005-03-08 | 2008-09-17 | 杭州华三通信技术有限公司 | Method for low cast detecting interconnected reliability of high frequency cable |
| WO2009033409A1 (en) * | 2007-09-07 | 2009-03-19 | Huawei Technologies Co., Ltd. | A method and a system for calibrating the parameters of a bus |
| CN101833889A (en) * | 2010-04-27 | 2010-09-15 | 广州市唯康通信技术有限公司 | Digital display twisted-pair termination detecting device |
| CN101170418B (en) * | 2007-12-05 | 2010-10-13 | 杭州华三通信技术有限公司 | Realization method, system and interface device for Ethernet electric interface compatibility |
| CN101487872B (en) * | 2009-02-17 | 2011-10-19 | 徐先 | Network cable test method and device |
| CN101788624B (en) * | 2009-12-25 | 2012-08-22 | 上海磁浮交通发展有限公司 | Device for testing electrical-connection topological structure |
| CN103278732A (en) * | 2013-05-27 | 2013-09-04 | 神木汇森凉水井矿业有限责任公司 | Communication cable testing device |
| CN104991164A (en) * | 2015-06-23 | 2015-10-21 | 中国电子科技集团公司第七研究所 | Cable on-line detector |
| CN105676051A (en) * | 2016-01-21 | 2016-06-15 | 北京荣达千里科技有限公司 | Integrated line sequence testing device and method |
| CN106226641A (en) * | 2016-08-30 | 2016-12-14 | 温岭甬岭水表有限公司 | Device for rapidly detecting open circuit of infrared receiving tube |
-
2001
- 2001-12-26 CN CN 01276663 patent/CN2552009Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419442C (en) * | 2005-03-08 | 2008-09-17 | 杭州华三通信技术有限公司 | Method for low cast detecting interconnected reliability of high frequency cable |
| WO2009033409A1 (en) * | 2007-09-07 | 2009-03-19 | Huawei Technologies Co., Ltd. | A method and a system for calibrating the parameters of a bus |
| CN101170418B (en) * | 2007-12-05 | 2010-10-13 | 杭州华三通信技术有限公司 | Realization method, system and interface device for Ethernet electric interface compatibility |
| CN101487872B (en) * | 2009-02-17 | 2011-10-19 | 徐先 | Network cable test method and device |
| CN101788624B (en) * | 2009-12-25 | 2012-08-22 | 上海磁浮交通发展有限公司 | Device for testing electrical-connection topological structure |
| CN101833889A (en) * | 2010-04-27 | 2010-09-15 | 广州市唯康通信技术有限公司 | Digital display twisted-pair termination detecting device |
| CN101833889B (en) * | 2010-04-27 | 2013-11-06 | 广州市唯康通信技术有限公司 | Digital display twisted-pair termination detecting device |
| CN103278732A (en) * | 2013-05-27 | 2013-09-04 | 神木汇森凉水井矿业有限责任公司 | Communication cable testing device |
| CN104991164A (en) * | 2015-06-23 | 2015-10-21 | 中国电子科技集团公司第七研究所 | Cable on-line detector |
| CN104991164B (en) * | 2015-06-23 | 2017-12-26 | 中国电子科技集团公司第七研究所 | A kind of cable on-line checking device |
| CN105676051A (en) * | 2016-01-21 | 2016-06-15 | 北京荣达千里科技有限公司 | Integrated line sequence testing device and method |
| CN106226641A (en) * | 2016-08-30 | 2016-12-14 | 温岭甬岭水表有限公司 | Device for rapidly detecting open circuit of infrared receiving tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |