The **48NDT-4B0-R** is a specific part number typically associated with **RJ45 Ethernet Connectors with integrated Magnetics** (also known as MagJacks). These components are essential in networking hardware, combining the physical connector and the electrical isolation circuitry into a single package. --- ## 1. Technical Specifications The following table outlines the typical electrical and physical characteristics of this series: | Feature | Specification | | :--- | :--- | | **Component Type** | RJ45 Connector with Integrated Magnetics | | **Port Configuration** | 1x4 (4 Ports, Side-by-Side) | | **Data Rate** | 10/100 Base-T (Fast Ethernet) | | **Shielding** | Metal Shielded (EMI Protection) | | **Mounting Type** | Through-Hole (THT) | | **Orientation** | Right Angle / Horizontal | | **Isolation Voltage** | 1500 Vrms | | **LED Indicators** | Often includes Green/Yellow LEDs (model dependent) | --- ## 2. Key Internal Electronic Components The "MagJack" architecture integrates several discrete electronic elements inside the metal housing to save PCB space and improve EMI performance: ### A. Isolation Transformers * **Purpose:** To provide galvanic isolation between the Ethernet cable and the PHY (Physical Layer) chip. * **Function:** It protects the delicate circuitry of the device from static electricity, surges, and common-mode noise on the network line. ### B. Common Mode Chokes * **Purpose:** Noise suppression. * **Function:** These coils filter out electromagnetic interference (EMI) that could radiate from the cable or interfere with the signal integrity of the data transmission. ### C. Terminating Resistors and High-Voltage Capacitors * **Purpose:** Impedance matching (typically 75 Ohms). * **Function:** These ensure that the signal does not reflect back (Return Loss), which is critical for maintaining data speeds over long cable runs. --- ## 3. Application and Usage This specific 4-port configuration is commonly used in multi-port networking equipment where space-saving is a priority. * **Network Switches:** Used in small office/home office (SOHO) 4-port switches. * **Industrial Controllers:** Used in PLCs or gateways that require multiple Ethernet connections. * **Multi-port Servers:** Found on motherboards or expansion cards requiring multiple LAN interfaces. --- ## 4. Part Number Breakdown (Typical) While naming conventions vary by manufacturer (such as **UDE** or **Pulse**), the suffix codes generally follow this logic: * **48:** Series designator. * **NDT:** Specific internal wiring schematic (Pinout). * **4B0:** 4-port count and mechanical housing style. * **R:** RoHS Compliant (Lead-free). ---