Understanding the Color Coding of Class B Network Keystones

Understanding the Color Coding of Class B Network Keystones

This article discusses the color coding of Class B keystones. Color coding is a fundamental aspect of network maintenance and proper implementation helps ensure correct connectivity. We review the differences with Class A, common standards, and installation basics.

Class A vs Class B

There are two main color standard classes for keystones: A and B. Class A was common with older CAT5 cabling, while Class B has become widespread with CAT5e and CAT6. Below are the color sequences for Class B and Class A.

Class A sequence: White/Green, Green, White/Orange, Blue, White/Blue, Orange, White/Brown, Brown.

Class B sequence: White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, Brown.

Both standards are used in the market today, but Class B is more prevalent in modern cabling and is commonly reflected in jacks, keystones, network sockets, and patch cords. This is why Class B color coding is often emphasized.

Cable types: Straight and Crossover

Network cables are broadly categorized into Straight (direct) and Crossover. Straight cables connect devices to network devices like switches, routers, and access points, while Crossover cables connect similar devices directly and use different end-color arrangements.

Does using different standards affect network quality?

Choosing Class B versus Class A color coding does not directly affect signal quality. The quality depends on the cable type (CAT5e, CAT6) and overall network design. Color coding mainly ensures compatibility and correct termination.

Conclusion

Cables and keystones come in various forms, and Class B color coding is widely used due to global compatibility. When selecting cables and keystones, consider the cable standards in use.

FAQ

• 1. What is the Class B keystone color coding? - It is a specific sequence of twisted-pair colors used to ensure correct cabling connections.
• 2. Why is keystone color coding important? - Correct color coding prevents signal interference and ensures reliable connections.
• 3. What is the difference between Class A and Class B color coding? - The difference lies in the wire pair order; Class B is more common and globally standardized.
• 4. How do you install Class B color coding? - Attach the wires to the keystone following the Class B sequence and punch down with the appropriate tool.
• 5. What tools are needed to install a network keystone? - Network cable, keystone, punch-down tool, cable stripper/loader, and a cable tester.

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