Based on the part number **48AV-4YVB-R**, this component is a high-performance **RJ45 MagJack** (Integrated Connector Module) manufactured by **Abracon** (formerly Foxconn/Broadcom lines). These parts are designed for networking hardware where space-saving and signal integrity are critical. --- ### 1. General Specifications The 48AV series typically represents a **1x4 Multi-port RJ45** configuration. These connectors integrate the physical mechanical port with internal magnetics required for Ethernet communication. | Feature | Specification | | :--- | :--- | | **Component Type** | RJ45 Modular Jack with Magnetics | | **Port Configuration** | 1x4 (Single Row, 4 Ports) | | **Ethernet Speed** | 10/100/1000 Base-T (Gigabit Ethernet) | | **LED Options** | Integrated (usually Green/Yellow) | | **Shielding** | Metal Shield with EMI fingers | | **Mounting Type** | Through-Hole (THT), Right Angle | --- ### 2. Key Internal Electronic Components The "MagJack" is not just a plastic connector; it contains a tiny PCB inside with the following electronic parts: * **Isolation Transformers:** Provides 1500Vrms isolation between the cable and the PHY chip to protect against electrical surges. * **Common Mode Chokes:** Used for EMI (Electromagnetic Interference) suppression to ensure the device passes FCC/CE noise regulations. * **Termination Resistors:** Built-in resistors (usually 75 ohms) for "Bob Smith" termination to reduce common-mode noise. * **High-Voltage Capacitors:** Decoupling capacitors (typically 2kV) to shunt noise to the chassis ground. --- ### 3. Part Number Breakdown (Estimated) While specific internal codes vary by manufacturer, the suffix **-4YVB-R** generally breaks down as follows: 1. **4:** Refers to the number of ports (1x4). 2. **YV:** Often denotes the LED configuration (e.g., Yellow and Green LEDs). 3. **B:** May refer to the housing material or internal circuit schematic (Gigabit vs. Fast Ethernet). 4. **R:** Indicates **RoHS Compliance** (Lead-free). --- ### 4. Typical Applications * **Networking:** Switches, Routers, and Hubs. * **Industrial:** Programmable Logic Controllers (PLCs) and Industrial Ethernet Gateways. * **Computing:** Multi-port Servers and Network Interface Cards (NICs). --- ### 5. Schematic Example Inside each port, the circuitry looks like this: ```text RJ45 Pins (Cable Side) <--> Transformer <--> Choke <--> PHY Pins (PCB Side) | Termination/Capacitor | Chassis Ground ```