Unique Bargains 4 Pcs 4 Pin RJ11 6P4C Modular Plug Telephone Connector

Common plugs and connectors - Helpful

How to convert a Cat 6 cable into an RJ11 using an RJ45 end - Quora

10pcs 4 Pin Rj11 Rj-11 6p4c Modular Telephone Phone Crystal Plug Connector - Connectors - AliExpress

AAOTOKK RJ11 Screw Terminal RJ11 4P 4C Male to 4Pin Female Bolt Screw Type terminals Plug for Telephone,CCTV wiring Coupler (2 Pack) : Electronics

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Male plug to female socket, 6P4C RJ11 PLUG.Plug the modem and telephone cable to a phone line.Suitable for standard telephone cable, is easy to use.

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uxcell 6P4C RJ11 to RJ11 Female/Female Telephone Cable Coupler Adapter White : Electronics