To test electrical wires without a multimeter, one simple method I use is a non-contact voltage tester. I just need to bring it close to the wire and it beeps or lights up if there's electrical current. They provide a safe and secure place to connect wires and protect them from damage. Understanding electrical wiring is essential for various DIY projects, home improvements, and basic maintenance tasks.
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Open the phone jacks and look in the box to see what cable they actually use, (suspecting can be cured by 30 seconds of effort to open the wall plate and look) and if there are loose Cat5e cables in there if the Cat5e is not what's connected to the phone jacks. Most network cables connected to the router or switch are hidden in the drywall or ceiling. When we want to replace the Ethernet cable or modify the Ethernet setup, identifying the target network cable.
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