networking - Convert RJ11 to ethernet cable? - Super User

Cat5e to Cat3(RJ11): Convert an exiting Cat5e cable into a phone line (Cat3/ RJ11).

Ethernet Splitter 1 to 2 RJ45 Extender [2 Devices Simultaneous Networking], Network Switch Converter with 1.2m USB Power Cable, Suitable for CAT

M12 to RJ45 X Code Cat6a Cable, Rt-Angled, M12 Connector IP68 rated, 10G, 10M, 32.8 ft

networking - Convert RJ11 to ethernet cable? - Super User

2-to-1 RJ45 Splitter Cable Adapter - F/M - Network Cable Adapters, Cables

StarTech.com Cat6 Cable - Cat6 Crossover Adapter - GbE - Red - Ethernet Network Cable (C6CROSSOVER) - crossover adapter - red

RJ45 and RJ11

Phone Jack To Ethernet Adapter

DataShield In-Line Surge Protector, 2-Line RJ11 RJ45