Telephone Modular Plug connector, generated image
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Size9.65 mm
SignalAnalog telephone / DSL
Standard6P2C / 6P4C

RJ11

Telephone Modular Plug
Invented in
1970s
Invented by
Bell System
Availability
Common (declining)

The smaller cousin of RJ45: the modular plug that connected landline telephones and, later, DSL modems to the wall socket.

Technical specifications
Standard6P2C / 6P4C
SignalAnalog telephone / DSL
Contacts2 to 4
FamilyModular (RJ)
Found on
a router
Recommended brands
01Telegärtner
02Goobay
03Hama
Where to buy
Amazonamazon.itReicheltreichelt.de
Europe-focused retailer searches. Some links are affiliate links and may earn a commission.
Fun fact

The same modular family scaled from 2-wire phones (RJ11) all the way up to 8-wire Ethernet (RJ45), one idea, many sizes.

Tips & tricks

An RJ11 plug fits an RJ45 socket but not the reverse, never force the wider plug in.

Philosophy

The sound of the dial-up era began here, the little click of an RJ11 into a modem, then that unmistakable screech.

Applications
Internet
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