Copper Termination & Connectivity
Connectors, punchdown blocks, patch panels, termination techniques, untwist limits, and work area components.
- Identify the 8P8C (RJ-45 style) connector as the standard for balanced twisted pair per IEC 60603-7
- Describe the purpose and differences between 66 blocks and 110 blocks
- Explain the function of patch panels and cross-connects
- State the allowable untwist limits at termination points
- Define MUTOA and its role in open office installations
Lesson 1
8P8C Connectors & Jack Termination
The Standard Connector
The standard connector for balanced twisted pair cabling is the 8P8C (RJ-45 style) connector meeting IEC 60603-7. The designation "8P8C" stands for 8 Position, 8 Contact - meaning the connector has 8 positions and all 8 are wired with contacts.
Exam Terminology
While commonly called "RJ-45," the technically correct name is 8P8C meeting IEC 60603-7. The exam may use either term - know that they refer to the same connector.
Wiring Standards - T568A and T568B
TIA-568 defines two pin-pair assignments for 8P8C connectors:
| Pin | T568A | T568B |
|---|---|---|
| 1 | White/Green | White/Orange |
| 2 | Green | Orange |
| 3 | White/Orange | White/Green |
| 4 | Blue | Blue |
| 5 | White/Blue | White/Blue |
| 6 | Orange | Green |
| 7 | White/Brown | White/Brown |
| 8 | Brown | Brown |
Both standards work equally well. The critical rule is consistency - use the same standard throughout an installation. T568B is the most common in commercial installations in North America. Government and military installations often use T568A.
Termination Quality
The quality of a termination directly affects link performance. Key factors include:
- Maintain pair twist as close to the termination point as possible
- Seat conductors fully into the IDC (Insulation Displacement Contact) slots
- Verify all 8 conductors are properly positioned before crimping
- Use the correct tool - a quality crimping tool with a ratchet mechanism ensures consistent pressure
The standard connector for balanced twisted pair is the 8P8C (RJ-45 style) meeting IEC 60603-7. Maintain consistency with either T568A or T568B throughout the installation.