Adapter cable RJ11 male / RJ45 male (3 meters) - RJ11 & RJ12 connectivity Generic on LDLC
Telecom Line Adaptor – RJ11 plug to RJ45 socket
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TAE adapter RJ45 male 8P8C to TAE-N female RJ11/RJ14 female 6P4C white 0.2m | eBay
RJ45 CONNECTOR: WHAT IS IT AND HOW DOES IT DIFFER FROM RJ11? - Linxcom UK