Homemade network cable tester, UTP Tester
Keywords: homemade network cable tester
Homemade network cable tester
Sun Yujun
The Internet has changed the traditional lifestyle in the Internet. Now computer technology has fly, broadband has entered thousands of households, and network access can take a variety of ways, such as unit LAN, Ad-SL, ISDN, MODEN, power carrier broadband, etc. The most commonly used connection media is still five twisted pairs, and it has been widely adopted by the network engineering. We often use the network to use the RJ45 connector, with a crimp stripper, 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 good, the usage network cable tester is tested. Here is a simple network cable tester working, you can DIY.
The network cable tester is divided into two units: part is a transmitting unit, powered by a 9V laminated battery, and has a power switch and a green power indicator. Another part is the receiving unit, and there are 5 light-emitting diodes indicate the network cable connection state. 1. As shown in Figure 2, the transmitting unit circuit is composed of 3-piece integrated circuits and a small number of peripheral components. The CD4069 is a six-inverter, which constitutes a multi-resonator and LED drive circuit, and the CD4017 is a decimal counter pulse distributor. Test pulses assigned to the network cable, 74LS367 is a six-bus driver to assist in generating a network cable test pulse.
2. The working principle is in FIG. 2, and the two inverters N1, N2, and R1, C1, R2 inside the CD 4069 constitute a positive feedback network, which constitute a multi-resmier, generating a rectangular pulse. The pulse signal is added to the decimal counter / pulse distributor CD4017's foot (CLK), and the pin (RST terminal) of the CD4017 is reset, the foot (CKINF1 terminal) is grounded, and the input pulse count is required. From Q1, Q3, Q5, Q7, Q9 and CO output pulse signals, the pulse output of QI is added to the D2 positive electrode, and D2 is turned on. The pulse signal of Q1 simultaneously adds to the 1 foot of the CD4069 (U1A), making its output 2 foot to low, current, transmit unit interface RJ45 1 pin, received network cable, receive unit interface RJ45 1 The 2 feet of the feet, D11, and the receiving unit RJ45 are returned to the transmitting unit. If D1 1 is lit, the network cable of the 1 foot and 2 feet is pass. The pulse of Q3 is added to the D4 positive electrode, and the pin (E2 end) and D4 end of the six bus driver 74L-S367 are added, and the signal is output at a high level from Q4 by 74L-S367, and the transmission unit is inverted by the 4069 U1D. The 6 foot of the RJ45 becomes low, current through the transmitting unit 3 foot, the network cable, outputs to the receiving unit, passes through the D13, the receiving unit 6 foot, the 3 and 6 foot of the network cable are tested. The same truth, pulse from Q5 foot output to D1 positive electrode and CD4069 (U1B) 3 foot, CD4069 (U1B) 4 foot output low level plus 4 foots of RJ45, completing test pair 4 foot and 5 foot network cable . Q7 output pulse. 1882. Add to D3 positive and CD4069 (U1C) 5 foot, complete testing of 7 feet and 8 foot network cable.
If the network cable is incorrect, the loop flowing changes, and the light-emitting diode is illuminated, so it can determine whether the connection mode is correct or not. If the pulse of the BNC interface, Q9 output, the pulse is added to the D5 positive electrode and 74LS367 D5 and E1 end, Q5 outputs high level, and is added to the other end of the BNC by 4069 (U1D), and test the BNC interface. The 4017 CO end also outputs a pulse R4 to DIO, and the power indicator flashes.
3. The test result D11 represents the state of the RJ45's 1 and 2 feet, D12 represents the state of the 4 and 5 pins of the RJ45, and D13 represents the state of the RJ45 3 and 6, D14 represents RJ45. The status of the 7 and 8 feet, D15 represent the state of the BNC.
When the network cable is normal, the LED is green; when the road is opened, the LED is destroyed, and the network cable connection is determined according to the LED lighting timing.
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