RJ45 vs RJ11: What is the difference between RJ45 and RJ11?
RJ45 Network Cable Tester for LAN Ethernet Cable RJ45 Cat7 Cat6a Cat6 Cat5 Cat5e RJ11 Telephone Cable
Uvital Phone Jack to Ethernet Adapter, RJ11 to RJ45 Adapter, RJ45 Female to RJ11 Male for Landline Telephone, with RJ45 to RJ11 Cable (Black,2 Pack): Amazon.co.uk: Electronics & Photo