March 08, 2024

Modern RJ45 connection system vs the old RJ45 connection system and how improved are they?


Modern RJ45 connection system vs the old RJ45 connection system and how improved are they?

Old RJ45 Connection System:

  • The original RJ45 connector design dates back to the 1960s and 1970s.
  • It was developed by AT&T as part of the Registered Jack (RJ) standard.
  • Key features of the old RJ45 system:
  • 8P8C (8 Position, 8 Contact) design: Eight pins for eight wires.
  • Primarily used for telephone connections initially.
  • Non-shielded connectors.
  • Limited data rates (e.g., 10 Mbps for early Ethernet).
  • Basic color-coded wiring arrangement.
  • Soldered assembly required.


Modern RJ45 Connection System:

  • The modern RJ45 system has seen significant improvements:
  • Higher Data Rates: Supports 1 Gbps (Gigabit Ethernet) and even 10 Gbps (10GbE) data rates.
  • Standardization: The 8P8C RJ45 jack remains consistent across various applications.
  • Color Coding: Strict color-coded wiring for consistency and ease of installation.
  • Pass-Through Connectors: Simplify alignment during installation and ensure proper wire sequence.
  • Shielded Options: Shielded RJ45 connectors protect against electromagnetic interference (EMI).
  • Cat5e and Cat6 Cables: Enhanced performance and backward compatibility.
  • Tool-Free Assembly: No soldering required; connectors snap into place.
  • Robustness: Designed for durability and reliability.
  • Ethernet Standardization: RJ45 connectors are synonymous with Ethernet connections.
  • PoE Support: Power Over Ethernet (PoE) compatibility.
  • Widespread Adoption: Used in LANs, data centers, and home networks.



Speed: Modern RJ45 connectors handle much higher speeds.

Ease of Installation: Pass-through connectors simplify alignment and crimping.

Reliability: Robust design ensures long-lasting connections.

Compatibility: Backward compatibility with older systems.

EMI Protection: Shielded options reduce interference.

Standardization: Consistent pinout and color coding.


In summary, the modern RJ45 system has evolved to meet the demands of high-speed networks while maintaining compatibility with legacy systems. These connectors continue to be the backbone of our interconnected world!