The **SFPT-RJK-01** is a high-performance Copper Small Form-factor Pluggable (SFP) transceiver module. It is designed specifically for high-speed communication links over Category 5 (Cat5) or better copper cabling. ### 1. Key Technical Specifications Below are the primary electronic and physical parameters for the SFPT-RJK-01: | Parameter | Specification | | :--- | :--- | | **Interface Type** | RJ-45 (Copper) | | **Data Rate** | 10/100/1000 Mbps (Auto-negotiation) | | **Max Cable Distance** | 100 meters | | **Connector Type** | RJ-45 female | | **Supply Voltage** | 3.3V | | **Power Consumption** | ~1.0W to 1.2W | | **Operating Temperature** | 0°C to 70°C (Commercial Grade) | --- ### 2. Core Electronic Components The internal architecture of the SFPT-RJK-01 consists of several critical electronic sections: #### A. Physical Layer (PHY) Chip This is the "brain" of the module. It handles the conversion between the **SerDes** (Serializer/Deserializer) signals from the host switch and the **baseband signals** required for copper transmission. It supports the IEEE 802.3ab (1000Base-T) standard. #### B. EEPROM / MCU The module contains a small memory chip (EEPROM) that stores identification data, including: * Vendor name * Serial number * Part number (SFPT-RJK-01) * Supported protocols This data is accessed via the **I2C serial interface** by the host device to ensure compatibility. #### C. Magnetic Transformer Module Located near the RJ-45 port, this component provides electrical isolation and signal conditioning. It protects the PHY chip from voltage spikes on the Ethernet cable and filters out electromagnetic interference (EMI). #### D. Power Management Circuitry The module operates on a 3.3V DC supply provided by the host SFP slot. Internal voltage regulators ensure stable power to the sensitive PHY chip, as copper SFPs typically consume more power and generate more heat than optical SFPs. --- ### 3. Connection Pinout The SFPT-RJK-01 uses the standard 20-pin SFP connector. Key pins include: * **VccR / VccT:** 3.3V Power Supply. * **VeeR / VeeT:** Ground connections. * **TD+/- and RD+/-:** Differential transmit and receive lines (High-speed data). * **SDA/SCL:** I2C interface for module identification. * **TX_Fault / TX_Disable:** Status and control signals. --- ### 4. Comparison: Copper vs. Optical SFP | Feature | SFPT-RJK-01 (Copper) | Optical SFP (Multi-mode) | | :--- | :--- | :--- | | **Medium** | Cat5e/Cat6 Copper | Fiber Optic Cable | | **Power Heat** | Higher (Warm to touch) | Lower | | **Latency** | Slightly higher (due to PHY) | Extremely low | | **Distance** | Limited to 100m | Up to 550m - 10km+ |