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network - Ethernet connection between rooms doesn't work: LEDs 2, 3 and 4 don't blink on cable tester - Home Improvement Stack Exchange
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Amazon.com: RJ45 Cable Tester - Network Cable Tester for LAN Phone RJ45 RJ11 RJ12 Cat5 Cat5e Cat6 Cat6a Cat7 Ethernet Cable Tester - Automatic Operation, Remote Testing - Durable and Sturdy : Electronics
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