General
SNMP support	v1, v2c, v3
DHCP options	66, 67, 82
Buffer size	1 Mbit
Alarm outputs	2 1 A @ 24 VDC
Air humidity	5–95 % nicht kondensierend
MTBF	1.090.077 Stunden (Telcordia, GB)
IGMP Snooping
LACP
LLDP
Syslog
RMON
Reset button
Overcurrent protection

The Moxa EDS-505A-SS-SC-T is an industrial managed Ethernet switch with three 10/100BaseT(X) RJ45 ports and two 100BaseFX single-mode fibre connections (SC connectors). It is specifically designed for use in harsh industrial environments where high reliability and operational safety under extreme conditions are required. The operating temperature ranges from -40 to +75 °C, enabling use in climatically demanding environments such as outdoor applications, cooling systems, or production halls with high temperatures. The device features a metal housing with protection rating IP30, which resists mechanical stress and dust, but is not suitable for direct moisture or splashing water. Mounting is standard on a DIN rail, with wall mounting optionally available.

Applications include industrial automation systems, factory networks, power supply systems, transportation technology, and marine applications. The switch is PROFINET-compatible and supports industrial communication protocols such as EtherNet/IP and Modbus TCP, making it suitable for integration into existing automation architectures. The dual power supply with two redundant inputs (12/24/48 VDC) and an operating voltage of 9.6 to 60 VDC ensures continuous power supply even if one voltage source fails. Additional protection features such as reverse polarity protection and overcurrent protection increase the device’s safety.

Functions and equipment in detail include a comprehensive range of network management and security functions. Support for VLAN (IEEE 802.1Q), QoS, IGMP Snooping, LACP, and Port Trunking enables efficient network segmentation and data prioritisation. SNMP support (versions 1, 2c, 3) as well as LLDP, Telnet, Syslog, and RMON provide extensive monitoring and diagnostic capabilities. For network security, functions such as HTTPS/SSL, TACACS+, RADIUS, SSH, Port Lock, and Broadcast Storm Protection are integrated to prevent unauthorised access and network overloads.

Technology explained simply shows that the switch features a MAC address table with 8K entries, enabling efficient packet forwarding. The buffer size of 1 Mbit ensures stable data transmission under high loads. The redundancy protocols Turbo Ring v1/v2, Turbo Chain, STP, RSTP, and MSTP guarantee network availability with recovery times under 20 ms, which is critical for demanding applications. Time synchronisation via NTP and SNTP enables precise time alignment within the network.

Compatibility and accessories include support for industrial protocols such as EtherNet/IP, Modbus TCP, and PROFINET, facilitating integration into existing control systems. The I/O interfaces include two alarm outputs (1 A @ 24 VDC) and two digital inputs (voltage range +13 to +30 V = 1; -30 to +3 V = 0; max. 8 mA), which can be used to connect external sensors or alarm systems. An RS-232 console (RJ45) enables local configuration and maintenance.

Mounting and installation is simple on a DIN rail, with wall mounting optionally available. Mechanical robustness is underscored by certifications such as IEC 60068-2-6/27/31 (shock, vibration, drop) and DNV (marine approval). The certifications also include ATEX and Class I Div. 2, enabling use in hazardous areas. The EMC and EMS certifications (EN 55032/35, CISPR 32, FCC Part 15B Class A, IEC 61000-4-2/3/4/5/6/8) guarantee high immunity to interference and electromagnetic compatibility.

Operational advantages include high reliability, long service life (MTBF: 1,090,077 hours according to Telcordia, GB), and a 5-year warranty. The combination of robust design, comprehensive management functions, and industrial protocol support makes the EDS-505A-SS-SC-T a powerful network component for demanding industrial applications.