## Overview of T2K-RJ002-POE The **T2K-RJ002-POE** is a specialized integrated RJ45 connector module designed for **Power over Ethernet (PoE)** applications. It combines a physical network interface with internal magnetics (transformers) and power pins to support data transmission and DC power delivery over a single Ethernet cable. --- ### Core Electronic Components The internal architecture of this part consists of several critical electronic segments: | Component | Function | Description | | :--- | :--- | :--- | | **Isolation Transformer** | Signal Integrity | Provides 1500Vrms isolation to protect the PHY chip from surges. | | **Common Mode Choke** | Noise Filtering | Suppresses electromagnetic interference (EMI) and common-mode noise. | | **PoE Center Taps** | Power Extraction | Allows the extraction of DC voltage (usually 48V) from the data pairs. | | **LED Indicators** | Status Feedback | Integrated Green/Yellow LEDs for Link and Activity monitoring. | | **Shielding Case** | ESD Protection | Metal outer shell to prevent RFI/EMI and ground the chassis. | --- ### Key Technical Specifications The T2K-RJ002-POE typically operates under the following electrical parameters: * **Ethernet Speed:** 10/100 Base-TX (Fast Ethernet). * **PoE Standard Compliance:** Supports IEEE 802.3af (up to 15.4W) or 802.3at (up to 30W) depending on the specific revision. * **Turns Ratio:** 1CT:1CT (Transmitter and Receiver). * **Operating Temperature:** Generally -40°C to +85°C (Industrial Grade). * **Contact Plating:** Gold plating (typically 6u" to 50u") to prevent oxidation and ensure stable connectivity. --- ### Circuit Integration Example When designing a PCB with the T2K-RJ002-POE, the electronic signal path follows this logic: ```mermaid graph LR A[RJ45 Port] --> B[Internal Magnetics] B --> C[Data: To Ethernet PHY] B --> D[Power: To DC/DC PWM Controller] D --> E[System Power 3.3V/5V] ``` ### Hardware Pinout Considerations 1. **Data Pins (1-8):** standard differential pairs for RX/TX. 2. **PoE Pins:** Taps located on the transformer side to route current to the bridge rectifier and PD (Powered Device) controller. 3. **LED Pins:** Separate pins for driving the integrated diodes via current-limiting resistors. ---