The **M2SES-1B2-R** is a specific electronic component within the category of **Ethernet Connector Modules**, specifically a MagJack (Integrated Connector Module). It combines a standard RJ45 connector with internal magnetic components required for Ethernet networking. --- ## 1. Core Specifications The following table outlines the primary technical characteristics of the M2SES-1B2-R: | Feature | Specification | | :--- | :--- | | **Component Type** | RJ45 MagJack (Integrated Connector Module) | | **Data Rate** | 10/100 Base-T (Fast Ethernet) | | **Configuration** | Single Port (1x1), Tab-Up | | **Shielding** | Metal Shield with EMI fingers | | **Mounting Type** | Through-Hole (THT) | | **LED Indicators** | Usually features Bi-color or single color LEDs (Green/Yellow) | --- ## 2. Internal Electronic Components The "MagJack" design means several electronic parts are miniaturized and placed inside the metal housing of the RJ45 jack: ### A. Isolation Transformers * **Purpose:** To provide galvanic isolation (usually up to 1500Vrms) between the PHY (Physical Layer) chip and the Ethernet cable. * **Function:** It protects the delicate circuitry of the motherboard from static electricity (ESD) or voltage spikes on the network line. ### B. Common Mode Chokes * **Purpose:** Noise suppression. * **Function:** These coils filter out electromagnetic interference (EMI) so that the data signals remain clean and compliant with FCC/CE emissions standards. ### C. Termination Resistors (Bob Smith Termination) * **Purpose:** Impedance matching. * **Function:** These resistors (typically 75 ohms) help match the impedance of the twisted-pair cable to prevent signal reflections that cause data errors. ### D. Integrated LEDs * **Function:** Visual feedback for Link status (connected) and Activity (data transfer). These are connected directly to the status pins of the Ethernet Controller. --- ## 3. Physical Layout and Pinout * **Mechanical Shielding:** The outer metal casing is grounded to the PCB to prevent the connector from acting like an antenna for radio frequency interference. * **Footprint:** It uses a standard footprint for 10/100 modules, but the "Tab-Up" orientation means the locking clip of the RJ45 cable will be facing the top of the board. --- ## 4. Typical Application Circuit When integrating this part, it sits between the **Ethernet PHY chip** and the **External World**. 1. **Input Side:** Connects to the TX/RX differential pairs of the processor or Ethernet controller. 2. **Output Side:** The RJ45 interface where the Cat5/Cat6 cable is plugged in.