The **EX87424-R2ST** is an industrial-grade Managed Ethernet Switch manufactured by **EtherWAN**. It is designed for harsh environments, providing high-reliability connectivity for automation, surveillance, and transportation networks. --- ## 1. Core Technical Specifications The EX87424 series is characterized by its "All-Gigabit" design and specific port configuration denoted by the suffix "R2ST". | Feature | Specification | | :--- | :--- | | **Total Ports** | 28 Ports | | **Copper Ports** | 24 x 10/100/1000BASE-T (RJ45) | | **Fiber Ports** | 4 x 1000BASE-SX/LX/BX (SFP Slots) | | **Management** | Layer 2 Managed (Web, SNMP, Telnet, CLI) | | **Form Factor** | 1U 19" Rackmount | | **Operating Temp** | -40°C to 75°C (-40°F to 167°F) | --- ## 2. Key Electronic Components & Subsystems ### A. Switching Fabric (The Brain) The device utilizes high-performance Application-Specific Integrated Circuits (ASICs) capable of **Wire-Speed Switching**. This ensures that all 28 ports can handle full-duplex traffic simultaneously without packet loss or bottlenecks. ### B. Industrial-Grade Power Supply Unlike commercial switches, the EX87424-R2ST features: * **Redundant Power Inputs:** Protects against power failure at the source. * **Voltage Range:** Typically supports wide DC inputs (e.g., 12-48VDC) or specialized AC options. * **Reverse Polarity Protection:** Prevents circuit damage if power wires are crossed during installation. ### C. Physical Layer (PHY) & Protection The "R2ST" designation often refers to specific connector types or hardening levels. * **ST Connectors:** If fiber is integrated (not SFP), it uses ST (Straight Tip) bayonet-style connectors, which are vibration-resistant. * **Surge Protection:** The RJ45 ports include high-level ESD (Electrostatic Discharge) and Surge protection (typically up to 6KV) to survive lightning strikes or industrial power surges. --- ## 3. Advanced Electronic Features ### Redundancy Protocols The firmware and internal logic support hardware-accelerated redundancy: * **Alpha-Ring:** EtherWAN’s proprietary recovery protocol (< 15ms recovery time). * **IEEE 802.1w RSTP & 802.1s MSTP:** Standardized spanning tree protocols for loop prevention. ### Diagnostic Monitoring (DDM) The SFP slots support **Digital Diagnostic Monitoring**. This allows the switch to electronically monitor fiber optic parameters such as: * Optical Output Power * Optical Input Power * Temperature * Laser Bias Current --- ## 4. Hardware Architecture Summary ```mermaid graph TD A[Power Input Redundant] --> B[Internal Voltage Regulator] B --> C[Switching ASIC / CPU] C --> D[24x Gigabit RJ45 Ports] C --> E[4x Gigabit SFP/ST Slots] C --> F[Flash Memory / RAM] F --> G[L2 Management OS] ``` ---