The RJ45 is the unit of networking. It is widely used in Ethernet cables, CCTV camera installations, PoE networks, routers, switches, and NVR systems. A properly crimped RJ45 connector ensures stable data transfer, reliable PoE power delivery, and long-term network performance.
What an RJ45 connector is
RJ45 color code diagrams (T568A
& T568B)
How to make an RJ45 Ethernet
cable step by step
Professional tips for the best
connection
What Is an RJ45 Connector?
An RJ45 (Registered Jack 45) connector is an 8-pin modular
connector used with twisted-pair Ethernet cables such as Cat5e, Cat6, and
Cat6A. It supports high-speed data transmission and Power over Ethernet (PoE),
making it essential for IP cameras and networking equipment.
Common uses of RJ45 connectors:
CCTV and IP camera systems
PoE switches and NVRs
Office and home LAN networks
Routers, modems, and access points
RJ45 Color Code Standards (With Diagram)
There are two wiring standards for RJ45 connectors: T568B
and T568A.
RJ45 Color Code Diagram – T568B (Most Common)
RJ45 Connector (Clip Facing Down)
T568B Pin Order:
White Orange
Orange
White Green
Blue
White Blue
Green
White Brown
Brown
Best for: CCTV cameras, PoE systems, offices, and commercial
networks
RJ45 Color Code Diagram – T568A
RJ45 Connector (Clip Facing Down)
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| W/G | G | W/O | B | W/B | O | W/Br | Br |
T568A Pin Order:
White Green
Green
White Orange
Blue
White Blue
Orange
White Brown
Brown
Important: Use the same standard on both ends of the cable.
Straight Cable vs Crossover Cable
Cable Type Color
Code Usage
Straight Cable T568B
– T568B IP cameras, switches,
routers, NVRs
Crossover Cable T568A
– T568B Rare, legacy device
connections
Modern devices support Auto MDI-X, so straight cables are
recommended.
Tools Required to Make an RJ45 Cable
Ethernet cable (Cat5e / Cat6)
RJ45 connectors
Cable stripper or cutter
How to Make RJ45 Ethernet Cable (Step-by-Step)
Step 1: Cut the Ethernet Cable
Cut the cable cleanly to the required length.
Step 2: Strip the Outer Jacket
Remove 1–1.5 inches of the outer insulation carefully.
Step 3: Arrange Wires by Color Code
Untwist the pairs and arrange them according to T568B
(recommended).
Step 4: Trim the Wires
Cut all wires evenly so they are straight and aligned.
Step 5: Insert Wires into RJ45 Connector
Hold the connector with the clip facing down
Push wires fully to the end
Double-check the color order
Step 6: Crimp the Connector
Insert the RJ45 connector into the crimping tool and press
firmly.
Step 7: Test the Cable
Use a network cable tester to confirm correct pin
connections.
Tips for Best RJ45 Connection (Pro Level)
Use Cat6 connectors for Cat6 cable
Make sure wires reach the front of the RJ45 plug
Avoid over-stripping the cable jacket
Use solid-core connectors for solid cable
Always test cables before installation
Avoid tight bends and sharp cable turns
Use shielded RJ45 connectors in high-interference areas
Common RJ45 Crimping Mistakes
Wrong color order
Loose or weak crimping
Mixing T568A and T568B
Using poor-quality connectors
Not testing the cable
RJ45 Connector for CCTV & PoE Cameras
In PoE CCTV installations, a poorly crimped RJ45 connector
can cause:
Camera disconnection
Video loss
PoE power failure
Network instability
A correct RJ45 termination ensures stable power, clear video
streaming, and long-term reliability.
Conclusion
The RJ45 connector is a small but critical component of Ethernet networking. By following the correct RJ45 color code diagram, using quality tools, and applying professional tips, you can create reliable Ethernet cables for home networks, offices, and CCTV systems.
A well-crimped RJ45 connector means better speed, fewer
errors, and longer cable life.
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