RJ45 Pinout Diagram for Ethernet Wiring
8-pin rectangular connector
Standards: TIA/EIA-568, ISO/IEC 11801
What is the RJ45 pinout?
The RJ45 Ethernet Connector has 8 pins. Pin 1 is TX+ (data). Pin 2 is TX- (data). Pin 3 is RX+ (data). Pin 4 is NC (reserved). Plus 4 more pins.
Standards: TIA/EIA-568, ISO/IEC 11801
Pin Assignment Table
| Pin | Signal | Type | Description |
|---|---|---|---|
| 1 | TX+ | data | Orange/White |
| 2 | TX- | data | Orange |
| 3 | RX+ | data | Green/White |
| 4 | NC | reserved | Blue |
| 5 | NC | reserved | Blue/White |
| 6 | RX- | data | Green |
| 7 | NC | reserved | Brown/White |
| 8 | NC | reserved | Brown |
Signal Types
Common Applications
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Browse the full pinout library →The RJ45 connector has 8 pins: Pin 1 (TX+), Pin 2 (TX-), Pin 3 (RX+), and Pin 4 (NC). Plus 4 more pins. Common in Ethernet networking and PoE (Power over Ethernet).
RJ45 Wiring Guide (T568A vs T568B)
The RJ45 connector (Registered Jack 45) is the standard physical interface for Ethernet networking. While the connector itself is standardized, the wiring scheme (pinout) varies between T568A and T568B standards. T568B is the most common commercial standard in the US.
Wiring Tips & Best Practices
For most installations, T568B is the preferred standard. However, if you are extending an existing network, you must match the existing scheme. Mixing T568A and T568B on the same cable creates a crossover cable, which was historically used for connecting similar devices (e.g., switch to switch) but is largely obsolete due to Auto-MDIX.
Common Issues
A common mistake is untwisting the pairs too far back from the connector. For Cat5e/Cat6 performance, keep the twists intact up to within 13mm (0.5 inch) of the termination point to minimize crosstalk.
Why Use Interactive Diagrams?
- Accuracy: Hover over pins to see exact signal names and descriptions
- Clarity: Color-coded by signal type (power, ground, data)
- Printable: Export clean diagrams for shop floor reference