The **M2CE-1G-R2** is a high-performance industrial networking module, specifically a **Gigabit Ethernet to M.2 (Key B+M)** interface converter. It is commonly used in industrial PCs (IPCs) and embedded systems to expand networking capabilities through an existing M.2 expansion slot. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Interface Type** | M.2 Key B+M (PCIe 2.1 x1) | | **Ethernet Controller** | Intel® I210-IT / I211-AT (Industrial Grade) | | **Data Rate** | 10/100/1000 Mbps (Triple Speed) | | **Port Configuration** | Single Port RJ45 | | **Operating Temperature** | -40°C to +85°C (Wide Temperature Support) | | **Voltage Input** | 3.3V (via M.2 Slot) | --- ### 2. Core Electronic Components The module consists of several critical sub-systems that ensure reliable data transmission: #### A. The Ethernet Controller (Intel I210/I211) This is the "brain" of the module. It handles the Physical Layer (PHY) and Media Access Control (MAC). - **Features:** Supports Jumbo Frames, IEEE 1588 Precision Time Protocol (PTP), and Audio Video Bridging (AVB). - **Industrial Advantage:** Unlike consumer chips, these controllers are designed for 24/7 operation and low latency. #### B. Isolation Transformer (Magnetics) Located near the RJ45 connector, this component provides **1.5kV Isolation**. It protects the internal M.2 circuitry from voltage spikes on the Ethernet cable and reduces EMI (Electromagnetic Interference). #### C. Power Management Integrated Circuit (PMIC) Since M.2 slots provide 3.3V, the onboard regulators convert and stabilize this voltage to the specific levels required by the Intel controller (often 1.0V or 1.2V for the core). #### D. External Daughterboard & Cable The M2CE-1G-R2 usually consists of: 1. **Main M.2 Board:** Plugged into the motherboard. 2. **RJ45 Daughterboard:** Mounted on the chassis I/O panel. 3. **Connection Cable:** A high-speed internal cable connecting the two pieces, designed to maintain signal integrity over short distances. --- ### 3. Pinout and Form Factor The module follows the **M.2 2242** form factor (22mm wide, 42mm long). - **PCIe Lanes:** Uses 1-lane (x1) of PCIe signaling to communicate with the CPU. - **Keying:** B+M keying ensures compatibility with both B-key and M-key slots found on modern industrial motherboards. --- ### 4. Typical Applications * **Industrial Automation:** Adding a secondary LAN for PLC communication. * **Edge Computing:** Providing dedicated network ports for IoT gateways. * **Network Appliances:** Creating firewalls or routers from compact embedded systems.