Adapter cable RJ11 male / RJ45 male (3 meters) - RJ11 & RJ12 connectivity Generic on LDLC
How to distinguish the RJ45&RJ11 | TP-Link
Amazon.com: RJ45 to RJ11 Cable, 6 Feet Phone Jack to Ethernet Adapter RJ11 6P4C Male to RJ45 8P8C Male Connector Plug Cord for Landline Telephone : Electronics
N03NF-889T Wire Tone Tracker RJ45 RJ11 Cable Coaxial Emitter with Alli – Gain Express