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RJ45 Network Cable Tester

Check out network cables and connectors

RJ45 Network Cable Tester
This simple tester allows faults in ISDN and Ethernet cables using RJ45 connectors to be traced quickly and efficiently.Many Ethernet and ISDN connection systems employ sockets and plugs called ‘RJ45’. They look like a slightly wider version of the RJ11 or ‘Western’ connectors as found on modern telephone sets. The RJ45 connector has 8 pins, although in some cases only four or six are actually used (designation: RJ45-4/8 and RJ45-6/8 respectively). The connectors are available in screened and nonscreened versions. For 10 Mbit/s and 100 Mbit/s (as well as for ISDN), the unscreened variants of the plug/socket combination is sufficient, provided the cables are of the ‘twisted pair’ type (unshielded twisted pair, UTP).
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 47k?
R2,R4-R11 = 1k?
R3 = 6k?8
P1 = 1k preset H
C1 = 1µF 16V radial
C2,C3,C4 = 100nF
C5 = 10µF 16V radial
C6 = 100µF 16V radial
D1,D4-D11 = LED, red, high efficiency
D2,D3,D12-D18 = 1N4148
D19 = 1N4001
T1 = BC547B
IC1 = 555C
IC2 = 74HC193
IC3 = 74HC138
IC4 = 78L05
K1,K2 = 8-way RJ45 socket, PCB mount (Farnell # 257-102)
2 Solder pins
Plastic case with battery compartment, size approx. 101x60x26mm (Conrad Electronics # 522864)
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