The **M2AS1-A223-R2** is a specific part number typically associated with high-performance networking hardware components, specifically an **NVIDIA/Mellanox LinkX 200Gb/s QSFP56 to 2x 100Gb/s QSFP56 Active Copper Splitter Cable**. Below is a detailed breakdown of its electronic components and technical specifications. --- ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Data Rate** | 200Gb/s (Split into 2x 100Gb/s) | | **Connector Type A** | QSFP56 (Quad Small Form-factor Pluggable 56) | | **Connector Type B** | 2x QSFP56 (Operating at 100Gb/s each) | | **Cable Type** | Active Copper Cable (ACC) | | **Modulation** | PAM4 (Pulse Amplitude Modulation 4-level) | | **Length** | Typically 2 Meters (indicated by the '2' in the suffix) | --- ### 2. Internal Electronic Parts Breakdown Unlike Passive Direct Attach Copper (DAC) cables, the "Active" nature of the **M2AS1-A223-R2** means it contains several integrated circuits (ICs) inside the connector shells to maintain signal integrity. #### A. Linear Equalizer (Redriver) Since this is an **Active Copper Cable (ACC)**, it contains a low-power linear equalizer. * **Function:** It compensates for the high-frequency attenuation caused by the copper wire. * **Benefit:** Allows the cable to be thinner and longer than a passive equivalent while maintaining a low Bit Error Rate (BER). #### B. EEPROM Chips Each connector head contains an EEPROM (Electrically Erasable Programmable Read-Only Memory). * **Data Stored:** Manufacturer ID, part number (M2AS1-A223-R2), serial number, and supported protocols. * **Interface:** Accessed via the **I2C serial interface** by the host switch or network card to identify the cable. #### C. Management Interface The electronics support the **SFF-8636** management interface. This allows the host system to monitor: * Supply voltage. * Case temperature. * Control functions like "Low Power Mode" and "Reset." #### D. PAM4 Logic The cable is designed for **PAM4 modulation**. The internal circuitry ensures that the four voltage levels used to transmit data are preserved across the copper medium, which is significantly more complex than the older NRZ (Non-Return to Zero) binary signaling. --- ### 3. Physical Architecture (The "Splitter") * **The "Y" Configuration:** The M2AS1-A223-R2 acts as a breakout cable. The electronics manage the transition from a single 4-lane 200G port into two separate 2-lane 100G ports. * **Shielding:** High-quality twinaxial (Twinax) copper wiring is used, shielded to prevent Electromagnetic Interference (EMI) between the high-speed lanes. --- ### 4. Applications This part is primarily used in data centers for: 1. **Switch-to-Server:** Connecting a 200GbE switch port to two 100GbE Network Interface Cards (NICs). 2. **Storage Clusters:** High-speed NVMe-over-Fabrics (NVMe-oF) connectivity. 3. **AI/HPC:** InfiniBand or Ethernet interconnects for HDR (High Data Rate) deployments.