Networking & Connectivity / Knowledge library

RJ-11 — Registered Jack 11

Names a registered telephone wiring interface.

Acronym study batch 2 · reviewed 2026-10-20

Why learn RJ-11 — Registered Jack 11?

Names a registered telephone wiring interface.

Where it came from

Registered jack names specify wiring arrangements, not just plastic shapes.

• Memory aid (a learning cue, not the expansion): Eleven rings a telephone.

Build your understanding

Work through these exercises in order. Try the task before opening a reference.

1. Without looking, expand RJ-11: Registered Jack 11.
2. Recall this memory aid: Eleven rings a telephone.
3. Explain the practical use: Names a registered telephone wiring interface.
4. Explain this distinction: Registered jack names specify wiring arrangements, not just plastic shapes.
5. Identify RJ-11 in a device specification, architecture diagram, or system inventory.

Documentation and sources

• IEEE 802 LAN/MAN standards (www.ieee802.org)
• IETF Internet standards (www.rfc-editor.org)

Catalog source: technology-maxxing. This page reproduces the existing catalog’s learning material and source links.