General
Number of RJ45 ports	7
Number of single-mode SC ports	1
Single-mode SC port range	80 km

The Moxa EDS-308-S-SC-80 is an unmanaged Industrial Ethernet Switch with 8 ports, specifically designed for use in demanding industrial environments. The device connects network devices via Ethernet and provides robust, reliable performance under extreme conditions. It features a single-mode SC optical connection with a range of 80 km, making it suitable for long distances in industrial networks. The remaining seven ports are configured as 10/100BaseT(X) RJ45 connections, which automatically detect and adapt to the transmission speed and duplex mode (Full- or Half-Duplex). The integrated Auto MDI/MDI-X function enables direct connection without additional crossover cables. The operating temperature of the device ranges from -40 to 75 °C, making it suitable for use in climatically extreme or outdoor installations. Devices in the EDS-308-S series undergo a 100%-burn-in test to ensure reliability in industrial automation systems.

Applications
The EDS-308-S-SC-80 is designed for use in industrial networks, particularly in environments with high demands for stability and reliability. It is designed for hazardous locations according to the standards Class 1 Div. 2 and ATEX Zone 2, making it suitable for use in areas with increased explosion risk. Typical application fields include factory automation, process control, power supply, and transportation infrastructure, where continuous network connectivity is required.

Functions and Equipment in Detail
A central feature of the switch is the integrated relay output, which sends a signal in case of power failure or port failure. This relay can operate with a load of 1 A at 24 VDC and is used to control external warning systems or alarm devices. Additionally, the switch features Broadcast-Storm protection, which prevents network overloads caused by uncontrolled broadcast messages from leading to failures. The unmanaged architecture means no configuration via web interface or CLI is required – the device operates immediately after connection.

Technology Explained Simply
The switch uses 100BaseFX technology for the optical connection, enabling transmission over fiber optic cables. The single-mode SC port with an 80 km range is particularly suitable for long distances where copper cables are no longer sufficient due to signal attenuation. The RJ45 ports support 10/100 Mbit/s, with speed automatically adjusted to the connection. The auto-negotiation function ensures optimal connection setup without manual intervention. The DIN rail mounting allows for easy installation in enclosures or distribution boxes.

Compatibility and Accessories
The switch is compatible with standard Ethernet networks and can be connected to any device supporting RJ45 or SC optical connections. Devices in the EDS-308-S series are designed for use in hazardous locations according to Class 1 Div. 2 and ATEX Zone 2, enabling use in explosive environments. Compliance with FCC, UL, and CE ensures adherence to relevant safety and EMC standards.

Mounting and Installation
The switch can be mounted directly onto a DIN rail, enabling flexible and space-saving installation in enclosures. Alternatively, it can be installed in a distribution box. Installation requires no special configuration – the device is plug-and-play capable.

Advantages in Operation
The combination of wide operating temperature range, integrated alarm relay, and Broadcast-Storm protection ensures high availability and safety in industrial operation. The unmanaged architecture reduces maintenance effort, as no configuration is required. The 80 km range of the single-mode port enables connection over long distances without requiring additional amplifiers or repeaters. Reliability is ensured by the 100%-burn-in test, which verifies stability of all devices before shipment.