The part number **47LM-1D2G-R** refers to a high-performance **Fiber Optic Transceiver Module**, typically categorized as an **SFP (Small Form-factor Pluggable)** module. These components are used in telecommunications and data networking to interface a network device motherboard (for a switch, router, or media converter) to a fiber optic or copper networking cable. --- ### Technical Specifications The breakdown of its technical characteristics is summarized in the table below: | Feature | Specification | | :--- | :--- | | **Module Type** | SFP (Small Form-factor Pluggable) | | **Data Rate** | 1.25 Gbps (Gigabit Ethernet) | | **Fiber Type** | Multi-Mode Fiber (MMF) | | **Wavelength** | 850 nm | | **Connector Type** | Dual LC (Lucent Connector) | | **Distance Support** | Up to 550 meters (on 50/125µm MMF) | | **Voltage Supply** | 3.3V | | **Compliance** | RoHS, MSA (Multi-Source Agreement) | --- ### Key Internal Components The electronic architecture of this module consists of several critical sub-parts: 1. **TOSA (Transmitter Optical Sub-Assembly):** * Contains a **VCSEL** (Vertical-Cavity Surface-Emitting Laser) diode. * This component converts electrical signals from the host device into light pulses. 2. **ROSA (Receiver Optical Sub-Assembly):** * Contains a **PIN Photodiode** and a Trans-Impedance Amplifier (TIA). * This component detects incoming light pulses and converts them back into electrical signals. 3. **Laser Driver:** * The integrated circuit (IC) that controls the current flowing to the laser to ensure stable light output. 4. **Limiting Amplifier:** * Processes the electrical signal from the ROSA to ensure it meets the voltage swing requirements of the host system. 5. **EEPROM:** * Stores identification data (serial number, vendor name) and configuration parameters which are read by the network switch via the **I2C interface**. --- ### Applications * **Gigabit Ethernet:** Primary use in high-speed local area networks (LANs). * **Fiber Channel:** Used in Storage Area Networks (SANs). * **Switch-to-Switch Interfaces:** Connecting rack-mounted switches within a data center. ---