General
Number of RJ45 ports	6
Number of fibre optic ports	3
Fibre optic connector	SC
Buffer size	512 kbit

The Moxa EDS-309-3M-SC is an unmanaged Ethernet switch of the EDS-309 series, specifically developed for use in industrial environments. It provides a cost-effective solution for reliable Ethernet connectivity under harsh operating conditions. The device features six 10/100BaseT(X) RJ45 copper ports and three 100BaseFX multi-mode fibre optic connections with SC connectors, enabling a flexible network architecture with transmission distances over longer ranges. The combination of copper and fibre optic connections makes the switch particularly suitable for applications where both local devices and remotely distributed end devices need to be connected.

Applications

The switch is designed for use in industrial automation environments, for example in manufacturing, energy, or transportation infrastructure. It is suitable for systems operated under extreme environmental conditions, such as in production halls, outdoors, or in hazardous explosive areas. Certification according to Class 1 Division 2 and ATEX Zone 2 allows use in areas with increased explosion risk, meeting the corresponding safety requirements.

Functions and Features in Detail

An integrated relay output with a load capacity of 1 A at 24 VDC serves as a warning function in case of power failure or interruption of a network port. This output can be activated via a DIP switch and enables an external response to network disturbances, for example triggering an alarm system or controlling an emergency mechanism. Additionally, Broadcast Storm Protection safeguards the network against overloads caused by faulty or uncontrolled data transmissions, ensuring network stability even under critical conditions.

Technology Explained Simply

The switch operates using the Store-and-Forward method, in which entire data packets are received, checked, and then forwarded. This ensures high data integrity, especially in environments with heavy data traffic. The MAC address table with 1,000 entries enables efficient management of connected devices, while the 512 kbit buffer ensures smooth data processing. Support for Auto-Negotiation, Auto-MDI/MDI-X, and half- and full-duplex operation ensures compatible and flexible connections to various network devices without manual configuration.

Compatibility and Accessories

The fibre optic connections in multi-mode SC format are compatible with standard multi-mode fibre optic cables commonly used in industrial applications. The copper ports support common Ethernet standard speeds of 10 and 100 Mbit/s. The devices are designed for use in existing Ethernet networks and require no special software configuration, as they are unmanaged switches.

Mounting and Installation

Mounting is simple via a DIN rail or in a distribution cabinet, enabling flexible integration into existing enclosures or control systems. The housing is made of metal, providing high mechanical stability and protection against electromagnetic interference. Mounting requires no special tools or additional components.

Operational Advantages

The EDS-309-3M-SC is designed for an extended temperature range of -40 to 75 °C, making it suitable for use in extreme environments. The devices undergo a complete Burn-In test to ensure reliability in continuous industrial operation. Certifications according to FCC, UL, and CE confirm compliance with international safety and functional requirements. The combination of robust design, integrated alarm solution, and high temperature tolerance makes the switch a reliable component in critical industrial networks.

Protection Rating and Environmental Conditions

The devices are not designed for direct outdoor use without additional protection, as no IP rating is specified.

Certifications

The devices meet the certifications FCC, UL, CE, Class 1 Division 2, and ATEX Zone 2, confirming suitability for use in explosive environments and compliance with European and American safety standards.

Operating Temperature

The standard version of the device is designed for operation from -10 to 60 °C, while the -T model (here: EDS-309-3M-SC) is designed for the extended range of -40 to 75 °C. This enables use in extremely cold or hot environments, such as those found in process industries or outdoor applications.

Housing and Mounting

The housing is made of metal and designed for mounting on a DIN rail or in a distribution cabinet. It provides mechanical protection and is designed for use in industrial enclosures.

Alarm Solution

The integrated relay output with 1 A @ 24 VDC can be used for warning in case of power failure or port interruption. Activation is done via a DIP switch, allowing the function to be optionally enabled.

Network Functions

Support for Auto-Negotiation, Auto-MDI/MDI-X, and half-/full-duplex operation ensures flexible and compatible connections to various network devices. Broadcast Storm Protection safeguards the network against overloads caused by faulty data packets.

Reliability

All EDS switches undergo a complete Burn-In test to ensure reliability in continuous industrial operation. This test is performed under realistic operating conditions to detect potential faults early.