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2025-03-07 21:46:07 R. Bishop: initial commit| /dev/null .. communications/ethernet/registeredjack.md | |
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| + | # Types of Registered Jacks (RJ45 & RJ11) |
| + | |
| + | ## Introduction to Ethernet Jacks |
| + | |
| + | Ethernet jacks are essential components in networking, providing a **physical interface for data transmission** over wired connections. The two most common types are **RJ45** and **RJ11**, each serving distinct purposes in **computer networking, telecommunications, and VoIP systems**. |
| + | |
| + | --- |
| + | |
| + | ## **What is RJ45?** |
| + | |
| + | RJ45 (Registered Jack 45) is the **standard connector for Ethernet networking**. It supports **8 pins** and is used with **twisted-pair cables (Cat5e, Cat6, Cat7, Cat8)** for high-speed data communication. |
| + | |
| + | ### **RJ45 Features & Applications** |
| + | - **Used in Ethernet networks** (LANs, WANs, data centers). |
| + | - Supports **Gigabit (1Gbps) and multi-gigabit speeds (10Gbps, 40Gbps)**. |
| + | - Compatible with **shielded (STP) and unshielded (UTP) twisted-pair cables**. |
| + | - Utilizes **8-position, 8-contact (8P8C) configuration**. |
| + | - Found in **network switches, routers, access points, and PCs**. |
| + | |
| + | ### **RJ45 Pinout & Cable Color Codes** |
| + | RJ45 connectors follow **two wiring standards**: **T568A** and **T568B**. |
| + | |
| + | #### **T568A Wiring Standard** |
| + | | **Pin** | **Cable Color** | **Purpose** | |
| + | |--------|----------------|-------------| |
| + | | 1 | White/Green | Transmit + | |
| + | | 2 | Green | Transmit - | |
| + | | 3 | White/Orange | Receive + | |
| + | | 4 | Blue | Unused (PoE Power) | |
| + | | 5 | White/Blue | Unused (PoE Power) | |
| + | | 6 | Orange | Receive - | |
| + | | 7 | White/Brown | Unused | |
| + | | 8 | Brown | Unused | |
| + | |
| + | #### **T568B Wiring Standard** |
| + | | **Pin** | **Cable Color** | **Purpose** | |
| + | |--------|----------------|-------------| |
| + | | 1 | White/Orange | Transmit + | |
| + | | 2 | Orange | Transmit - | |
| + | | 3 | White/Green | Receive + | |
| + | | 4 | Blue | Unused (PoE Power) | |
| + | | 5 | White/Blue | Unused (PoE Power) | |
| + | | 6 | Green | Receive - | |
| + | | 7 | White/Brown | Unused | |
| + | | 8 | Brown | Unused | |
| + | |
| + | **T568B is the most commonly used standard in modern Ethernet cabling.** |
| + | |
| + | --- |
| + | |
| + | ## **What is RJ11?** |
| + | |
| + | RJ11 (Registered Jack 11) is primarily used in **telecommunications** for telephone lines and **DSL broadband connections**. It supports **6 positions and 2 to 4 contacts (6P2C or 6P4C configuration)**. |
| + | |
| + | ### **RJ11 Features & Applications** |
| + | - Used for **landline phones, DSL internet, fax machines**. |
| + | - Supports **analog voice transmission**. |
| + | - **Smaller than RJ45**, only carrying **one communication line**. |
| + | - Can be inserted into an **RJ45 port**, but not vice versa. |
| + | |
| + | ### **RJ11 Pinout & Cable Color Codes** |
| + | | **Pin** | **Cable Color (2-Wire)** | **Cable Color (4-Wire)** | **Purpose** | |
| + | |--------|-----------------|-----------------|-------------| |
| + | | 1 | Not Used | Black | Additional Line (if present) | |
| + | | 2 | Not Used | Red | Additional Line (if present) | |
| + | | 3 | Green | Green | Tip (Primary Line - Positive) | |
| + | | 4 | Red | Yellow | Ring (Primary Line - Negative) | |
| + | | 5 | Not Used | Black | Additional Line (if present) | |
| + | | 6 | Not Used | Not Used | Unused | |
| + | |
| + | **Pins 3 and 4 (Red & Green) are the primary pair used in standard telephone connections.** |
| + | |
| + | --- |
| + | |
| + | ## **Key Differences Between RJ45 and RJ11** |
| + | |
| + | | Feature | RJ45 | RJ11 | |
| + | |------------|------------------|----------------| |
| + | | **Size** | Larger (8P8C) | Smaller (6P2C or 6P4C) | |
| + | | **Pins** | 8 | 2 to 4 | |
| + | | **Use Case** | Ethernet networking | Telephone & DSL | |
| + | | **Cable Type** | Cat5e, Cat6, Cat7, Cat8 | Telephone wire | |
| + | | **Data Transmission** | High-speed internet | Voice communication | |
| + | |
| + | --- |
| + | |
| + | ## **Conclusion** |
| + | RJ45 and RJ11 connectors serve **different purposes**, with RJ45 dominating **computer networking** and RJ11 being used in **telephony and DSL internet**. Understanding their wiring standards and configurations ensures proper installation and functionality in **both home and commercial environments**. |