I have an outdoor rj45 ethernet coupler where 1 side of it has a flat ethernet cable plugged in. When I test the whole connection with ethernet cable tester the 2nd light is always off where the other 7 blink in unison on the tester. I confirmed the coupler is fine with other non flat cables. I get the same bad result with 2 different flat ethernet cables so I'm guessing it's something in the wiring of the flat cables? Suggestions Thanks
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Splices, taps, and couplers are not allowed by the ANSI/TIA 568 Commercial Building Telecommunications Infrastructure Standard. You are introducing impedance mismatches that can kill the signal.– Ron Maupin ♦Commented Oct 27, 2023 at 19:08
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1 Answer
Flat, round or any other form - all twisted-pair cables intended for Ethernet have the same pinout with pairs 1-2, 3-6, 4-5 and 7-8. Pin 2 is required for all Ethernet variants, even two-pair 10BASE-T and 100BASE-TX.
When even a simple cable tester finds a fault then forget about the cable and replace it.
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Agreed, if the cable fails such a simple continuity test, the cable is faulty or the connector is. Replace the cable and/or the coupler. Commented Oct 27, 2023 at 22:26