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RJ11 Plug (6P4C)

PLUG-RJ11

A phone connector crimped onto the end of a telephone line.

Type: Adapter
Connectors: RJ11

In-depth technical details

RJ11 (6P4C) has 6 wiring positions, but a single phone line in the common case only actually uses the center two (positions 3-4) -- the rest are reserved for multi-line wiring.

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Connector anatomy

RJ11 (6P4C)

01 6 contact positions A phone line uses only the middle pair; the outer positions are spare or carry a second line.
02 Locking clip Snaps inside the socket so vibration cannot pull the plug out. A snapped clip is the number-one cause of intermittent network drops.
03 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
04 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

An RJ11 plug is crimped onto the end of a telephone line with a dedicated crimping tool. It has six contact positions, but an ordinary phone line uses only the middle pair — the outer positions are spare or carry a second line.

Positions: 6P4C
Termination: Crimped, insulation-displacement contacts

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Technical specifications

Type	Adapter
Connectors	RJ11

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