The **M2REB-R2C-R** is a specific part number typically associated with high-performance networking components, specifically within the **NVIDIA/Mellanox ConnectX-6** series of network interface cards (NICs). Below is a breakdown of the electronic architecture and technical specifications associated with this hardware class. --- ### 1. Component Overview This part number refers to a **ConnectX®-6 VPI adapter card**. It is designed for data centers, high-performance computing (HPC), and cloud infrastructures. | Feature | Specification | | :--- | :--- | | **Data Rate** | Up to 200Gb/s (HDR InfiniBand or 200GbE) | | **Interface Type** | PCIe 4.0 x16 | | **Port Count** | Single-port (typically QSFP56) | | **Form Factor** | Low Profile (LP) or Tall Bracket available | | **Protocol Support** | InfiniBand, Ethernet, RoCE v1/v2 | --- ### 2. Key Electronic Subsystems #### A. The Silicon (Integrated Circuit) The heart of the board is the **ConnectX-6 ASIC**. This is a highly integrated System-on-Chip (SoC) that handles: * **Packet Processing:** Hardware engines for encapsulation/decapsulation. * **Virtual Protocol Interconnect (VPI):** Allows the chip to sense whether it is connected to an Ethernet switch or an InfiniBand fabric and adjust its logic automatically. #### B. SerDes (Serializer/Deserializer) The electronic physical layer (PHY) uses advanced SerDes technology to achieve 50Gb/s per lane (PAM4 modulation). For a 200G connection, it utilizes 4 lanes of 50G. #### C. Power Management The board contains complex **Voltage Regulator Modules (VRMs)**. Because these cards can draw significant power (up to ~25W-30W depending on the transceiver), the onboard electronics must step down the PCIe 12V rail to low-voltage, high-current rails (e.g., 0.8V or 1.1V) for the ASIC core. --- ### 3. Connection and Logic Specifications * **PCIe Gen 4.0 Logic:** The card uses a PCIe 4.0 x16 interface, providing a theoretical bandwidth of 31.5 GB/s to the CPU, ensuring the 200Gbps network pipe is not bottlenecked by the bus. * **RDMA Offload:** The electronic logic includes dedicated hardware for **Remote Direct Memory Access (RDMA)**. This allows the network card to move data directly from the memory of one server to another without involving the CPU. * **Clocking:** High-precision oscillators are used to maintain timing synchronization, essential for synchronous networking and GPUDirect technologies. --- ### 4. Physical Port Configuration The "R2C" designation often implies the port configuration: * **Connector:** QSFP56 (Quad Small Form-factor Pluggable). * **Media:** Compatible with Copper (DAC), Active Optical Cables (AOC), or Transceivers. ---