RJ45 vs RJ11: What is the difference between RJ45 and RJ11?
Amazon.com: Keple RJ11 Cable ADSL 10ft Extension Lead Phone Cord Telephone Plug High Speed Xfinity Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket/Microfilter/Landline Wire (Black) : Electronics
RJ11 RJ-11 ADSL 4 Wire Internet Cable Phone Lead 0.5m | eBay
RJ11 to BT Landline Telephone Phone Cable Lead Modem FAX Plug BT Socket 2m - 10m | eBay