When setting up a network, knowing the RJ45 color code is essential. RJ stands for Registered Jack, and RJ45 refers to the Registered Jack–45 connector, which is the standard 8-pin modular plug used for Ethernet networking. Whether you’re crimping cables for internet, IP cameras, or a complete CCTV system, following the correct wiring standard ensures stable performance and signal quality. In this blog, we’ll cover the RJ45 color codes (T568A and T568B), explain their differences, highlight important points, and show how RJ45 connectors are used in CCTV camera installation.
What is RJ45?
RJ45 is an 8-pin modular connector commonly used in Ethernet networking. It connects devices like:
- Computers
- Routers & switches
- IP CCTV cameras
- DVR/NVR systems
RJ45 cables (Cat5e, Cat6, Cat6a) allow high-speed data transfer and Power over Ethernet (PoE), which is crucial for modern CCTV setups.
RJ45 Color Code Standards
ANSI/TIA defines two major wiring standards:
🔹 T568A Standard
- White/Green
- Green
- White/Orange
- Blue
- White/Blue
- Orange
- White/Brown
- Brown
🔹 T568B Standard (most commonly used in CCTV and networking)
- White/Orange
- Orange
- White/Green
- Blue
- White/Blue
- Green
- White/Brown
- Brown
📌 Important Point:
- Both ends of the cable should follow the same color code to make a straight-through cable (for connecting devices to switches, routers, or NVRs).
- For crossover cables (rarely used today), one end is T568A and the other T568B.
Difference Between Straight-Through and Crossover Cable
RJ45 cables can be wired in two ways – Straight-through and Crossover.
- Straight-through Cable: Both ends follow the same standard (T568B–T568B or T568A–T568A). These are used for connecting different devices like IP cameras to switches/NVRs, or computers to routers.
- Crossover Cable: One end follows T568A, and the other follows T568B. These are used to connect similar devices directly (like computer-to-computer).
📌 Important Point: In CCTV installations, straight-through (T568B) cables are the default choice, ensuring reliable connectivity between IP cameras and the NVR system.
Common Mistakes in RJ45 Crimping
Many beginners face problems when crimping RJ45 connectors. Here are the most common mistakes:
- Wrong color sequence – leads to no connection or unstable signal.
- Loose connections – if wires are not fully pushed into the connector, the camera may lose network.
- Excess cable bending – sharp bends can reduce speed and damage the copper pairs.
- Mixing cable categories – using Cat5 instead of Cat6 in high-resolution CCTV projects can cause lag.
📌 Tip for Installers: Always use a cable tester after crimping to verify proper connectivity before final installation.
RJ45 in CCTV Camera Systems
In CCTV installations, RJ45 connectors and Cat5e/Cat6 cables are essential, especially for IP cameras.
- Video Transmission: RJ45 carries digital video data from IP cameras to the NVR.
- Power over Ethernet (PoE): With PoE switches, the same cable provides both power and data to the camera, eliminating separate power supplies.
- Remote Access: RJ45 ensures stable network connections, enabling remote monitoring via apps and web browsers.
📌 Important Point for Installers:
Always use Cat6 or higher for CCTV projects with multiple IP cameras to ensure reliability and future-proofing.
FAQs on RJ45 Color Code
Q1. What is the full form of RJ in RJ45?
👉 RJ stands for Registered Jack. RJ45 means Registered Jack – 45, a standard 8-pin connector widely used in Ethernet networking and CCTV camera systems.
Q2. What is the purpose of the RJ45 color code?
👉 To standardize wiring, avoid confusion, and ensure compatibility between devices.
Q3. Which RJ45 color code is better – T568A or T568B?
👉 Both work fine, but T568B is more widely used in CCTV and networking applications.
Q4. Can I use RJ45 for analog CCTV cameras?
👉 No, analog cameras use BNC connectors. RJ45 is for IP cameras. However, special baluns allow CAT cables to work with analog signals.
Q5. Why does color sequence matter in RJ45?
👉 Wrong sequence can cause data loss, unstable connections, or no signal at all.
Q6. Do I need special tools to crimp RJ45?
👉 Yes, you need a crimping tool, cable tester, and RJ45 connectors for proper termination.
✅ Key Takeaways (Important Points): ON RJ45 COLOR CODE
- RJ45 follows two standards – T568A & T568B.
- T568B is commonly used in CCTV installations.
- RJ45 allows both data & power (PoE) for IP cameras.
- Correct color coding prevents signal loss & network errors.
- Use quality Cat6 cables for professional CCTV setups.