The **EX77424-R2ATR** is a high-performance, industrial-grade Managed Ethernet Switch produced by **EtherWAN**. It is designed specifically for harsh environments, such as smart city infrastructure, transportation systems, and industrial automation. --- ### ## Core Electronic Components & Specifications The device is built using robust electronic components designed for high MTBF (Mean Time Between Failure) and reliability. | Component Category | Specification / Details | | :--- | :--- | | **Network Ports** | 24-port 10/100/1000BASE-T (RJ45) + 4-port 1G/10G SFP+ | | **Switching Capacity** | 128 Gbps (Backplane) | | **Power Input** | Redundant 12 to 48VDC Terminal Block | | **PoE Support** | IEEE 802.3at/af (PoE+) on copper ports | | **Enclosure** | IP30 Aluminum Case | | **Operating Temp** | -40°C to 75°C (-40°F to 167°F) | --- ### ### Key Internal Systems #### 1. Power Supply Unit (PSU) Circuitry The "R2" designation often refers to the specific power and hardware revision. This unit utilizes **Redundant Power Inputs**, meaning the internal PCB contains two separate DC-to-DC conversion circuits. If one power source fails, the secondary takes over without packet loss. It also includes: * **Reverse Polarity Protection:** Prevents damage if wires are connected incorrectly. * **Overload Current Protection:** Resettable fuses to protect internal logic. #### 2. Ethernet Controllers & PHYs The board integrates high-density Physical Layer (PHY) chips capable of handling Gigabit speeds across 24 channels. These chips are hardened against **Electrostatic Discharge (ESD)** and **Surge Protection**, meeting IEC 61000-4 standards. #### 3. Processor & Memory As a "Managed" switch, it contains a dedicated CPU (often ARM or MIPS-based) and dedicated RAM to handle the **Alpha-Ring** redundancy protocol and Layer 2 management features like VLANs, IGMP Snooping, and QoS. #### 4. SFP+ Transceiver Interfaces The four 10G SFP+ slots use high-speed differential signal traces. These ports allow for fiber optic connectivity, providing total galvanic isolation between network segments, which is critical in industrial zones with high electrical noise. --- ### ### Protection Standards The electronic assembly is tested against rigorous industrial standards: * **EMI/EMS:** FCC Part 15B Class A, VCCI Class A. * **Shock/Vibration:** IEC 60068-2-27 / IEC 60068-2-6. * **Free Fall:** IEC 60068-2-32.