The **EX77424-R3RTR** is a high-performance, hardened industrial Ethernet switch manufactured by **EtherWAN**. It is specifically engineered for critical infrastructure, such as ITS (Intelligent Transportation Systems), power substations, and industrial automation. --- ## 1. Core Technical Specifications The device is a managed 28-port switch designed for rack-mount installation. | Component | Specification | | :--- | :--- | | **Total Ports** | 28 Ports | | **Copper Ports** | 24 x 10/100/1000BASE-T (RJ45) | | **Fiber Ports** | 4 x 1/10G SFP+ slots | | **Switching Capacity** | 128 Gbps | | **MAC Address Table** | 16K entries | | **Input Voltage** | Redundant 100-240VAC or 110-370VDC | --- ## 2. Key Electronic Components & Features ### A. Power Supply Unit (PSU) The "R3RTR" designation typically refers to specific power configurations. * **Redundancy:** It features redundant power inputs to ensure zero downtime. If one power source fails, the internal circuitry seamlessly switches to the secondary source. * **Protection:** Includes built-in surge and ESD (Electrostatic Discharge) protection, crucial for environments with high electrical noise. ### B. The SFP+ Interface The 4 SFP+ slots are the electronic "uplink" components. * They support **10Gbps** speeds, allowing for high-bandwidth backhaul to a central server or core switch. * They are "hot-swappable," meaning the electronic transceiver can be replaced without powering down the unit. ### C. Industrial Grade Processing Unlike consumer switches, the EX77424 uses electronic components rated for **Hardened** use: * **Operating Temperature:** Designed to function between **-40°C to 75°C** (-40°F to 167°F). * **Fanless Design:** Uses advanced thermal dissipation (heatsinks) rather than mechanical fans, reducing the risk of mechanical failure and dust accumulation. --- ## 3. Management & Protocol Support The internal firmware/logic chips support advanced Layer 2 networking features: * **Redundancy Protocols:** Supports **Alpha-Ring**, RSTP, MSTP, and STP to provide sub-15ms recovery in case of link failure. * **Security:** Electronic filtering via ACLs (Access Control Lists), Port Security, and 802.1X authentication. * **Traffic Control:** IGMP Snooping for Multicast traffic (essential for IP Surveillance). --- ## 4. Physical Build Quality * **Chassis:** 1U 19" Rack-mount, ruggedized metal housing. * **Connectivity:** Gold-plated RJ45 pins to prevent corrosion in humid environments. ---