Moxa EDS-208A-MM-ST 8-Port ST Multi-mode Fiber Interface Switch

The Moxa EDS-208A-MM-ST is an industrial-grade, unmanaged Ethernet switch designed for robust network connectivity in demanding environments. This 8-port switch features dual ST multi-mode fiber interfaces, providing reliable, long-distance data transmission and enhanced immunity to electromagnetic interference. Its compact, DIN-rail mountable design simplifies installation, making it an ideal choice for applications in manufacturing, transportation, and energy sectors requiring dependable network infrastructure. Key technical parameters include 8 x 10/100BaseT(X) Ethernet ports and 2 x 100BaseFX multi-mode fiber ports with ST connectors, operating temperature ranges from -10 to 60°C, and an input voltage of 12/24/48 VDC.

Product Specifications

| Feature                   | Specification                                      |

| :------------------------ | :------------------------------------------------- |

| Ethernet Ports            | 8 x 10/100BaseT(X)                                 |

| Fiber Ports               | 2 x 100BaseFX multi-mode, ST connectors            |

| Fiber Wavelength          | 1300 nm                                            |

| Fiber Distance            | Up to 2 km                                         |

| Network Redundancy        | Turbo Ring (optional, requires specific models)    |

| Power Input               | 12/24/48 VDC (450 mA @ 24 VDC)                     |

| Operating Temperature     | -10 to 60°C (14 to 140°F)                          |

| Storage Temperature       | -40 to 85°C (-40 to 185°F)                         |

| Humidity                  | 5 to 95% RH (non-condensing)                       |

| Dimensions                | 31 x 135 x 105 mm (1.22 x 5.31 x 4.13 in)            |

| Mounting                  | DIN-rail, wall-mount, or panel-mount               |

| Standards & Certifications| FCC Part 15, CISPR 22, CE, UL, ATEX (Zone 2)       |

Core Features & Market Positioning

The Moxa EDS-208A-MM-ST distinguishes itself through its robust industrial design and reliable multi-mode fiber optic connectivity. Unlike standard office switches, it is engineered to withstand harsh industrial conditions, including vibration, shock, and extreme temperatures. The inclusion of dual ST multi-mode fiber ports offers a cost-effective solution for extending network reach over several kilometers while providing immunity to electrical noise, a critical advantage in environments like factory floors or substations. Its unmanaged nature simplifies deployment, requiring no complex configuration, which reduces setup time and potential for user error, positioning it as a plug-and-play solution for industrial automation networks seeking dependable connectivity. This makes it a competitive choice against other industrial Ethernet switch manufacturers focusing on similar ruggedized specifications.

Key Application Scenarios

This Moxa EDS-208A-MM-ST finds extensive use in industrial automation where reliable data transmission is paramount. In manufacturing plants, it facilitates communication between PLCs, HMIs, and SCADA systems, even across noisy environments or significant distances on the factory floor. For transportation systems, such as railway signaling or intelligent traffic management, the fiber ports ensure uninterrupted data flow, resisting electromagnetic interference common in these settings. Furthermore, in the energy sector, it is deployed in substations and power generation facilities for monitoring and control networks, where robustness and extended reach are essential for operational integrity.

Practical System Integration Guidance

Integrating the Moxa EDS-208A-MM-ST into an existing industrial network is straightforward due to its plug-and-play functionality. For Ethernet connectivity, standard Cat5e or Cat6 Ethernet cables can be used to connect devices to the 10/100BaseT(X) ports. For the multi-mode fiber ST ports, appropriate multi-mode fiber optic cables (e.g., 62.5/125 µm or 50/125 µm) are required, ensuring the correct connector type (ST) is used at both ends. The switch supports automatic MDI/MDI-X for Ethernet ports, simplifying cabling by eliminating the need for crossover cables. Power can be supplied via a 12, 24, or 48 VDC power source, utilizing the provided screw terminal connector for secure connections, with polarity protection to prevent damage from incorrect wiring.

Operation and Risk Mitigation

Operating the Moxa EDS-208A-MM-ST requires minimal intervention, as it is an unmanaged switch. However, for optimal performance and longevity, it's crucial to ensure proper ventilation and avoid exposing the unit to excessive dust or corrosive agents. Power supply stability is key; using a regulated DC power source within the specified voltage range (12/24/48 VDC) mitigates the risk of operational failure or damage. In environments prone to power fluctuations, a UPS or redundant power supply configuration (if supported by the power source) is advisable. While the EDS-208A-MM-ST itself does not generate complex fault codes, network issues can be diagnosed by observing the link and activity LEDs on each port, which indicate physical connection status and data transmission.

Scalability & Long-Term Value

The Moxa EDS-208A-MM-ST offers a solid foundation for industrial network expansion. Its standard Ethernet and fiber interfaces ensure broad compatibility with a wide range of industrial devices and existing network infrastructure. While this is an unmanaged switch, Moxa offers a comprehensive portfolio of managed switches and industrial Ethernet solutions, allowing for seamless upgrades to more advanced networking capabilities, such as redundant ring topologies (e.g., Turbo Ring) or advanced security features, as network demands grow. Integration into IIoT platforms is facilitated by its reliable data connectivity, enabling the aggregation of data from edge devices for analysis and process optimization, thus providing long-term value in evolving industrial environments.

Frequently Asked Questions

What is the maximum distance for the multi-mode fiber on the Moxa EDS-208A-MM-ST?

The multi-mode fiber ports on the Moxa EDS-208A-MM-ST are rated for 100BaseFX and can reliably transmit data up to 2 kilometers (approximately 1.24 miles). This distance is sufficient for most within-plant or campus-wide applications.

This extended reach capability is crucial for connecting separate buildings or overcoming interference in large industrial complexes. Proper fiber optic cable selection and installation are essential to achieve this maximum distance.

Can I use single-mode fiber with the EDS-208A-MM-ST?

No, the Moxa EDS-208A-MM-ST is specifically designed with multi-mode fiber interfaces (100BaseFX) and ST connectors. Single-mode fiber has different optical characteristics and requires different transceivers and connectors.

Using single-mode fiber with a multi-mode port will result in a non-functional connection. Always match the fiber type (multi-mode or single-mode) to the switch's specifications.

How do I power the Moxa EDS-208A-MM-ST industrial switch?

The EDS-208A-MM-ST supports a wide input voltage range of 12/24/48 VDC. It features a removable screw terminal connector for a secure power connection. Ensure the power source is regulated and within the specified voltage range.

Pay close attention to the polarity when connecting the power; incorrect polarity can lead to operational issues or damage. Redundant power inputs are not a standard feature on this specific model.

What is the operating temperature range of the Moxa EDS-208A-MM-ST?

This industrial switch is built to operate reliably in challenging environmental conditions, with an operating temperature range of -10 to 60°C (14 to 140°F). This allows for deployment in many factory floor or outdoor cabinet scenarios.

Ensure adequate ventilation around the switch to prevent overheating, especially in enclosed spaces or during peak operational loads. The storage temperature range is wider, from -40 to 85°C.

Is the Moxa EDS-208A-MM-ST a managed or unmanaged switch?

The Moxa EDS-208A-MM-ST is an unmanaged industrial Ethernet switch. This means it requires no configuration and is designed for straightforward plug-and-play deployment.

Unmanaged switches are ideal for simple network extensions where advanced features like VLANs or QoS are not needed. They offer a cost-effective and easy-to-deploy networking solution.

What type of fiber optic connectors does the EDS-208A-MM-ST use?

The Moxa EDS-208A-MM-ST utilizes ST connectors for its multi-mode fiber optic interfaces. ST connectors are a common and robust bayonet-style connector widely used in industrial and telecommunications applications.

When purchasing fiber optic patch cables, ensure they are terminated with ST connectors on both ends for compatibility with this switch. Multi-mode fiber is typically orange or aqua.

Can this switch be used in hazardous locations?

Certain versions of Moxa's EDS-208A series switches, including potentially this model or related variants, may carry ATEX certifications for use in hazardous locations (e.g., Zone 2). Always verify the specific product model and its certifications for suitability in explosive atmospheres.

Consult the product datasheet or contact Moxa support to confirm ATEX compliance for your intended hazardous environment. Proper installation procedures are critical for safety compliance.

What is the warranty period for the Moxa EDS-208A-MM-ST?

Moxa typically offers a standard warranty period for their industrial networking equipment, often around 3 to 5 years, depending on the product line and region. For the most accurate warranty information, refer to the official Moxa website or your sales representative.

Checking the warranty is important for long-term investment planning and understanding support availability. Registering your product upon purchase is often recommended.

How does the fiber optic connection improve network reliability compared to copper?

Fiber optic connections offer significant advantages in reliability for industrial settings. They are immune to electromagnetic interference (EMI) and radio frequency interference (RFI), which can corrupt data on copper cables in noisy factory environments.

Fiber also allows for longer transmission distances without signal degradation compared to copper Ethernet cables. This makes it ideal for connecting devices across large facilities or between buildings.

What diagnostic LEDs are available on the Moxa EDS-208A-MM-ST?

The Moxa EDS-208A-MM-ST features standard LED indicators for each port to aid in diagnostics. These typically include power status, link indication (indicating a physical connection), and activity (indicating data transmission).

Observing these LEDs can help quickly identify network connectivity issues. For example, a solid link light confirms a physical connection, while a flashing activity light shows data is being exchanged.