28 lines
929 B
Markdown
28 lines
929 B
Markdown
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tags:
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- resource
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created: 2026-05-29 18:26
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---
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## Summary
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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.
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| Pin Number | Standard Handset Color | Description |
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| ---------- | ---------------------- | ---------------------------- |
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| **Pin 1** | Blue / White | Handset Receiver (RX) |
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| **Pin 2** | Yellow / Black | Receiver / Microphone Ground |
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| **Pin 3** | Green / Red | Microphone (TX) Ground |
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| **Pin 4** | Red / Green | Microphone Power / TX |
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#### Pinout Orientation
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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](https://www.youtube.com/watch?v=miMuRXJVNYI&t=3)]
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## Notes
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## References
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