929 B
929 B
tags, created
| tags | created | |
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2026-05-29 18:26 |
Summary
The RJ9 connector (often referred to as RJ10 or RJ22) is a4-position, 4-conductor (4P4C) modular plug standard used to connect telephone handsets to phone bases.
| Pin Number | Standard Handset Color | Description |
|---|---|---|
| Pin 1 | Blue / White | Handset Receiver (RX) |
| Pin 2 | Yellow / Black | Receiver / Microphone Ground |
| Pin 3 | Green / Red | Microphone (TX) Ground |
| Pin 4 | Red / Green | Microphone Power / TX |
Pinout Orientation
When looking at the gold pins of the male plug facing you (with the locking clip facing down), Pin 1 is on your far left and Pin 4 is on your far right. [1]