RJ12 is backwards compatible with RJ11. Will fit RJ11 ports and also RJ12 ports. BE AWARE OF FAKE 'CAT6'/'CAT6a' CABLES AVAILABLE ELSEWHERE. They're a gimmick. The cable is shielded with foil and features twisted pairs for maximum signal integrity.
20m Meter RJ11 to RJ-11 ADSL Broadband Internet Router Modem DSL Phone Cable UK
RJ11 to RJ 11 Coupler for ADSL/Phone Cables
RJ11 to RJ 11 Coupler for ADSL/Phone Cables and extending cables.
7.7 Meter RJ11 to RJ-11 ADSL Broadband Internet Router Modem DSL Phone Cable UK
1M RJ11 to RJ 11 - VDSL FIBRE Broadband Telephone Phone - Cat6 FTP Shielded RJ12
5M ADSL Internet Broadband RJ11 to RJ-11 Cable Lead - 5 Metre Long Black DSL
