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.
eBay
1-5pc ANENG M469D RJ45 RJ11 Cable Network Lan Tester RJ45 RJ11 Wire Telephone Line Detector Tool LAN Cable Tester network Repair
Aliexpress UK
1x RJ11 6P4C straight coupler for connecting RJ11 cables and 1x DSL/RJ11 Cable. RJ11 6P4C Straight Coupler. RJ11 to RJ11 Female/Female Sockets. RJ11 to RJ11 Modem cable. RJ11 Extension. Lengths: 1m to 30m.
eBay
Networking RJ45 To RJ11 Converter Cable, Internet To Telephone Adapter,RJ45 to RJ11 Converter Adapter Cable 35cm 594A
Aliexpress UK
Versatile Connectivity: This conversion adapter allows you to easily connect an Ethernet forRJ45 male connector to an for RJ11 female port, making it ideal for various networking needs. Conversion cable 3.
eBay
RJ45 to RJ11 Converter Adapter Cable Connector, Ethernet To Phone Line Connector RJ45 8P8C Male To RJ11 6P6C Female Cord
Aliexpress UK
Coax Cables. Brilliant strap, great value, great quality s8cvh. Cable typeRJ11. AV Cable - Fuji. Cable designFlat. AV Cable - Canon. AV Cable - Kodak. AV Cable - Minolta.
eBay
telephone Ethernet RJ45 8P8C male To RJ11 6P4C female Adapter Cable,Office Converter Cord Male To Female RJ45 to RJ11 Converter
Aliexpress UK
RJ11 TO RJ11 CORD COUPLER, MODULAR SOCKET TO SOCKET ADAPTOR. CORD COUPLER RJ11 TO RJ11. Connector type A:RJ11 6P4C. Connector type B:RJ11 6P4C. Cord Coupler. Good luck.
eBay
ProPatch Shielded RJ45 Cat7 Cat6/CAT6A Coupler RJ45 Coupler, Female to Female Ethernet Extender Adapter Inline Ethernet Coupler
Aliexpress UK
The telephone splitter is made of ABS material, durable, wear resistant, easy to plug and unplug, smooth surface and long usage life. Straight through wiring connector, light weight, space saving, easy to carry and store, just plug and play, easy to use. This product only has the function of transferring from Internet to telephone, and has nothing to do with the network. Please confirm the compatiblity before purchase. Package includes 2 pieces of telephone RJ11(6P4C)Female to RJ45(8P8C)Male Cable. Connector 1 RJ11 Female Connector 2 RJ45 Male Material ABS, Copper Colour White Size 37x21x16mm/ 1.46x0.83x0.63in Cable Length About 145mm/5.71in Type Adapter Brand Unbranded/Generic MPN MEM94670792152 EAN 4894670792152 .
eBay
2-Pack Shielded Cat6a RJ45 Inline Couplers, Female to Female Ethernet Coupler, RJ45 Coupler for Cat6/Cat6a/Cat7 Ethernet Cables
Aliexpress UK
Connection B 2x RJ11 (4/6) Female. Connection A RJ11 (6P4C) Female. Vacuum Cleaner Bags. CCTV & Baby Monitors. Baby Monitors. Disco & Party. Coffee Machine Cleaning. Laptop / Tablet Case & Covers.
eBay
noyafa NF-820 RJ45 RJ11 BNC Network Cable tester High Low Voltage Cable Underground Cable Finder Anti-Interference Wire Tracker
Aliexpress UK
This coupler is suitable for connecting two RJ11 telephone cables to each other. Connection A RJ11 (6P4C) Female Connection B RJ11 (6P4C) Female Colour White Adapter type RJ11 Outside material ABS 2 PACK .
eBay
Cat 8 Ethernet Coupler, Shielded RJ45 Coupler PoE Cable Extender for Cat7/Cat6a/Cat6/Cat5e Network Cable, RJ45 Inline Coupler
Aliexpress UK