The part number **M2AS1-A121-R2/Q** refers to a high-performance **2.5 Gigabit Ethernet (2.5GbE) Network Interface Card (NIC)**, typically produced by hardware manufacturers like **Aetina** or specialized industrial PC component providers. It is an M.2 form factor module designed for embedded systems and industrial computing. ### 1. Technical Specifications The following table outlines the primary electronic and hardware characteristics of the module: | Component | Specification | | :--- | :--- | | **Form Factor** | M.2 2280-D2-B-M (Standard M.2 2280) | | **Controller/Chipset** | Intel® Ethernet Controller I225-IT/LM | | **Interface** | PCI Express (PCIe) Gen 2.0 x1 | | **Data Rate** | 10/100/1000/2500 Mbps (Multi-Gigabit) | | **Number of Ports** | 1 Port (Single Port) | | **Power Consumption** | Approx. 1.8W to 2.2W | | **Connector** | RJ45 (typically via a daughterboard/cabling) | --- ### 2. Key Electronic Components #### A. Intel I225 Controller The heart of this module is the Intel I225 series controller. It is designed to bridge the gap between 1GbE and 10GbE. * **Time Sensitive Networking (TSN):** Supports protocols like IEEE 802.1AS and 802.1Qav for synchronized networking in industrial automation. * **Offloading:** Includes hardware acceleration for TCP/UDP/IP checksum offloading to reduce CPU overhead. #### B. M.2 Interface (B+M Key) The module utilizes a PCIe x1 lane through the M.2 slot. This allows for easy integration into modern motherboards that lack standard PCIe slots but have available M.2 storage or expansion slots. #### C. Isolation and Protection Industrial versions (denoted by the "IT" in the chipset or specific suffixes) often include: * **Magnetic Isolation:** Prevents electrical surges from the Ethernet cable from damaging the host system. * **Wide Temperature Tolerance:** Usually rated for $-40°C$ to $+85°C$ to handle harsh environments. --- ### 3. Pinout and Connectivity Since the M.2 2280 form factor is physically small, the RJ45 port is usually connected via a 10-pin or 20-pin **wafer connector** on the module, which then leads to a separate bracket. ```markdown [ M.2 Module ] <--- (Internal Cable) ---> [ RJ45 Daughterboard ] ``` --- ### 4. Application Use Cases 1. **Industrial IoT (IIoT):** Connecting sensors and machines to local high-speed networks. 2. **Edge AI:** Providing high-bandwidth data ingestion for AI inference boxes. 3. **Network Appliances:** Small form factor firewalls or routers requiring 2.5GbE throughput.