Introduction The JHA-MIWS28H series is a high-performance, cost-effective, high-end intelligent gigabit managed ring network industrial-grade optical fiber switch. Support 2 10G optical ports (SFP slots) + 8 10/100/1000Base-T(X) port. It adopts the self-developed JHA-RING ring network technology (network failure self-healing time <20ms), users can easily set a redundant ring network to increase network reliability, and also supports CLI, SNMP, WEB, VLAN management, support Console/Telnet command line management. Rich QoS features for data flow control and management, support ring protocol, RSTP and STP Ethernet redundancy, support port-based VLAN, IEEE 802.1Q VLAN and GVRP protocol. The product also uses fanless, low power consumption, industrial-grade design, can adapt to harsh industrial environments, and has an operating temperature range of -40 to 85°C, which can meet the requirements of various industrial sites.