General
Number of RJ45 ports	6
Number of fibre optic ports	2
Fibre optic connector	SC
Maximum range	80 km

The Moxa EDS-308-MM-SC is a compact unmanaged Ethernet switch, specifically developed for industrial applications. It features eight Fast Ethernet ports, with six ports implemented as 10/100BaseT(X) with RJ45 connectors and two ports as 100BaseFX with SC connectors for multimode fiber. The devices are designed for use in demanding environments, particularly in areas with high requirements for reliability and safety. The robust construction and certification according to ATEX Zone 2 as well as Class I Division 2 make the switch suitable for applications in explosive atmospheres. The protection rating IP30 and the metallic housing ensure high protection against mechanical impacts and particles, with intended use in indoor environments.

Applications

The switch is designed for use in industrial automation, power supply networks, rail and transportation sectors, as well as in security and monitoring systems. The certifications according to ATEX Zone 2 and Class I Division 2 enable use in environments where explosion hazards exist, for example in petrochemical or mining industries. The devices are also suitable for applications in extreme environmental conditions, such as those occurring in process industries or mobile installations.

Functions and Equipment in Detail

The EDS-308-MM-SC features a relay output with a rated power of 1 A at 24 VDC, which can be used to signal faults such as power failure or port disconnection. This enables integrated monitoring and alarm within the network infrastructure. The Broadcast Storm Protection can be activated via a DIP switch to prevent network failures caused by excessive data transmission. The ports support Auto-Negotiation, Full- and Half-Duplex mode as well as Auto-MDI/MDI-X, enabling flexible and easy integration into existing networks.

Technology Explained Simply

The six RJ45 ports allow connection to standard Ethernet devices, while the two SC fiber ports are designed for transmission over multimode fibers. The maximum range is up to 80 km, with the actual range depending on the fiber quality and transmission conditions. The operating voltage is not explicitly stated, however the operating temperature for the standard model is specified between -10 °C and 60 °C. For models with extended temperature range (designated with -T), the range is -40 °C to 75 °C. The devices are designed for use in enclosures and can be mounted on DIN rails.

Compatibility and Accessories

The switch is compatible with standard Ethernet networks and can be connected to devices supporting RJ45 or SC fiber connectors. The use of multimode fibers enables flexible network design, especially in installations with larger distances between end devices. The certifications according to FCC, UL, CE, ATEX Zone 2 and Class I Division 2 ensure compliance with international safety and performance standards.

Mounting and Installation

Mounting is done via DIN rails, enabling easy integration into existing enclosures. The devices are intended for use in distribution boxes and can be installed without additional mounting aids. The robust construction and IP30 protection rating ensure reliable operation under industrial conditions.

Advantages in Operation

The EDS-308-MM-SC provides a reliable network connection in demanding environments. The integrated alarm function via the relay output enables quick response to network faults. Support for Auto-Negotiation and Auto-MDI/MDI-X reduces installation complexity. Certifications according to ATEX and other standards ensure suitability for critical applications. Easy mounting and robust construction contribute to service-friendliness and long service life.