Network Cabling Standards: ISO IEC 11801 and TIA-568

Overview

• Networks are installed with standardized methods and color codes.
• These standards ensure uniformity across different organizations.
• ISO IEC 11801 is an international standard for cabling.
• In North America, TIA-568 is the prevalent standard.

TIA-568 Cabling Standard

• Known as the Commercial Building Telecommunications Cabling Standard.
• Details can be found on the TIA website: tiaonline.org.
• Focuses on pin and pair assignments for Ethernet connections using 8P8C connectors (eight position, eight conductor).

T568A and T568B Standards

• Two standards for color coding wires in Ethernet connections:
  • T568A
  • T568B
• Both have the same functionality and neither is superior.
• 568A often used for horizontal cabling.
• 568B commonly used for end-user connections.

Misconception about Ethernet Crossover Cables

• Ethernet crossover cables are incorrectly defined as having 568A on one side and 568B on the other.
• Actual crossover cable design follows IEEE standards, not TIA-568.

Color Schemes for T568A and T568B

• T568A:
  • Pin 1: White/Green
  • Pin 2: Green
  • Pin 3: White/Orange
  • Pin 6: Orange
• T568B:
  • Pin 1: White/Orange
  • Pin 2: Orange
  • Pin 3: White/Green
  • Pin 6: Green
• Pins 4, 5, 7, 8 have the same color in both standards (Blue, Brown).

Installation and Identification

• Inspect the back of an Ethernet connector to determine the standard used by checking wire colors.
• Punchdown blocks may have both A and B schemes labeled.
• Installers match the wires to the appropriate color scheme.
• Example:
  • An installer uses 568A by placing orange wires in specific slots and green in others.
  • Blocks often show color schemes for both standards to guide installation.

Conclusion

• Understanding these standards is crucial for consistent and functional network installation.
• Knowledge of these color codes aids in troubleshooting and network maintenance.