Simple network cable tester circuit diagram and production

September 08, 2022

Test - lowercase jpg
Kaixin micro test
Test probe P100-M3

Overview:

In the era of the global village where the Internet is everywhere, the Internet has changed people's traditional way of life. Nowadays, computer technology has advanced by leaps and bounds. Broadband has entered thousands of households. Network access can take many forms, such as unit LAN, ADSL, ISDN, MODEM, power carrier broadband and so on. The most commonly used connection medium is the Category 5 twisted pair cable, which has been widely adopted by network engineering. When we set up the network, we often use the RJ45 connector and use the crimping pliers as the interface of various specifications, as shown in Figure 1. The quality of the interface is very important, it affects the success of the network connection. After the network cable is ready, the common network cable tester is used for testing. Here is a simple network cable tester working principle, you can DIY.

Src="http://i.bosscdn.com/blog/nophoto.gif" /></p><p >Crimping pliers for various specifications</p><p >The cable The tester is divided into two units: one part is the sending unit, which is powered by a 9V laminated battery, and has a power switch and a green power indicator. The other part is the receiving unit, which has five LEDs indicating the connection status of the network cable. The circuit is shown in Figure 3. </p><p>Transmitter unit The circuit principle is shown in Figure 2. It consists of three integrated circuits and a small number of peripheral components. The CD4069 is a six-inverter that forms a multivibrator and LED driver circuit. The CD4017 is a decimal counter pulse divider. Assigned to the appropriate test pulse for the network cable, the 74LS367 is a six-bus driver that assists in generating network cable test pulses. <img alt=

Simple network cable tester transmitting unit circuit diagram

Width="401" height="274" src="http://i.bosscdn.com/blog/nophoto.gif" /></p><p >Simple cable tester receiving unit circuit diagram</p>< p>Working principle In Figure 2, the two inverters N1, N2 and R1, C1, R2 inside CD4069 form a positive feedback network, which constitutes a multivibrator and generates a rectangular pulse. The pulse signal is applied to the (14) pin (CLK terminal) of the decimal counter/pulse distributor CD4017. The (15) pin (RST terminal) of the CD4017 is reset when power is applied, and the (13) pin (CKINF1 terminal) is grounded, and the input pulse is counted. The pulse signals are output from Q1, Q3, Q5, Q7, Q9 and CO, and the pulse output from QI is applied to the positive electrode of D2 to turn on D2. The pulse signal of Q1 is simultaneously applied to pin 1 of CD4069 (U1A), so that its output pin 2 becomes low level, current flows through D2, pin 1 of the transmitting unit interface RJ45, the tested network cable, and the receiving unit interface RJ45 1 The foot, D11, and the 2 legs of the receiving unit RJ45 return to the transmitting unit. If D1 1 is lit, it indicates that the network cables of pins 1 and 2 are open. The pulse of the Q3 output is applied to the positive terminal of D4, and is applied to the (15) pin (E2 terminal) and D4 terminal of the six-bus driver 74LS367. The signal is output from the high level of Q4 via 74L-S367, and the RJ45 of the transmitting unit is inverted by the U1D of 4069. The 6 feet become low level, and the current is sent to the receiving unit through the sending unit 3 pin and the measured network cable, and passes through D13, the receiving unit 6 feet, and tests the 3 and 6 feet of the network cable. By the same token, the pulse output from the Q5 pin is applied to the D1 positive pole and the CD4069 (U1B) pin 3, and the CD4069 (U1B) 4-pin output low level is applied to the RJ45's 4 pin to complete the test of the 4-pin and 5-pin network cables. . The pulse of the Q7 output is applied to the D3 positive pole and the CD of the CD4069 (U1C) to complete the test of the 7-pin and 8-pin network cables. </p><p>If the network cable is connected incorrectly, the loop that has flowed changes, and the LED is lit, so you can determine if the connection mode is correct or not. If the BNC interface is tested, the pulse output from Q9 is applied to the D5 positive terminal and the D5 and E1 terminals of the 74LS367. The Q5 output is high level and is inverted to the other end of the BNC via 4069 (U1D) to test the BNC interface. The CO end of the 4017 also outputs a pulse to RIO via R4, and the power indicator flashes. </p><p>Test ResultsD11 indicates the state of pins 1 and 2 of RJ45, D12 indicates the state of pins 4 and 5 of RJ45, and D13 indicates the state of pins 9 and 6 of RJ45. D14 indicates the state of pins 7 and 8 of RJ45, and D15 indicates the state of BNC. When the network cable is normal, the LED is green; when the network cable is open, the LED is off, and the connection status of the network cable can be determined according to the LED lighting timing. </p> </div> </div> <div class="tech-detail-share"> <!-- Baidu Button BEGIN --> <div class="bdsharebuttonbox"> <a href= "#" class="bds_qzone" data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title=" Share to Sina Weibo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</ Span> </div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic" : "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName(

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