The **OG-F8HT28DP** is a specialized high-performance optical transceiver module, typically categorized as a **QSFP28 (Quad Small Form-factor Pluggable 28)** device. It is designed for high-density 100G Ethernet connectivity, primarily used in data centers and enterprise networking. --- ## Technical Specifications The following table outlines the primary electronic and optical characteristics of the OG-F8HT28DP: | Feature | Specification | | :--- | :--- | | **Form Factor** | QSFP28 | | **Data Rate** | 100 Gbps (4 x 25G) | | **Wavelength** | 850nm (Multimode) | | **Media Type** | MMF (Multi-Mode Fiber) | | **Max Distance** | 70m (OM3) / 100m (OM4) | | **Connector** | MPO-12 (Male) | | **Power Consumption** | < 2.5W - 3.5W | | **Supply Voltage** | 3.3V | --- ## Key Electronic Components The "electronic parts" within this module are integrated into a compact PCB (Printed Circuit Board) inside the metal housing. They manage the conversion between electrical signals from the switch and light pulses for the fiber. ### 1. Integrated Circuit (IC) Components * **CDR (Clock and Data Recovery):** These chips reside on both the transmit and receive channels. They clean up the signal, reduce jitter, and ensure the 25Gbps per-lane data timing is precise. * **TOSA (Transmitter Optical Sub-Assembly):** Contains the **VCSEL (Vertical Cavity Surface Emitting Laser)** drivers. It converts the electrical data into 850nm light pulses. * **ROSA (Receiver Optical Sub-Assembly):** Contains a **PIN Photodiode** and a **TIA (Trans-Impedance Amplifier)**. The TIA converts the incoming light pulses back into measurable electrical current. ### 2. Monitoring & Control * **EEPROM:** Stores the module's identification, serial number, and manufacturer data. This is what the network switch reads via the **I2C interface**. * **DDM/DOM (Digital Diagnostic Monitoring):** This circuitry monitors real-time parameters such as internal temperature, supply voltage, laser bias current, and optical transmit/receive power. ### 3. Electrical Interface * **38-pin Connector:** The module uses a standard gold-finger edge connector to interface with the host switch/router. This carries the high-speed differential signals (4 lanes TX, 4 lanes RX) and low-speed control signals (SCL, SDA, ResetL, ModSelL). --- ## Application and Usage Because this module operates at 850nm over Multimode Fiber, it is used for **Short Reach (SR4)** applications. It is ideal for: 1. **Switch-to-Switch** links within the same rack. 2. **Server-to-Switch** 100G high-bandwidth uplinks. 3. **Data Center Core** interconnects using MPO/MTP breakout cables.