MOXA EDS-308-MM-SC – Unmanaged Industrial Ethernet Switch for Mixed Copper/Fiber Networks

The MOXA EDS-308-MM-SC is a compact, unmanaged 8-port Fast Ethernet switch designed for harsh industrial environments. It combines six 10/100BaseT(X) copper ports with two 100BaseFX multi-mode SC fiber ports, which typically makes it a great fit when you need to bridge longer cabinet-to-cabinet runs (up to around 2 km on MM fiber) without adding configuration overhead. From my experience, it’s often chosen for production lines, CCTV backbones, and utility cabinets that value simple deployment, redundant power, and solid uptime.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in-stock items; no more than 1 month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• 6 RJ45 + 2 MM SC fiber – Six 10/100BaseT(X) copper ports for local devices, plus two 100BaseFX multi-mode SC ports for stable cabinet-to-cabinet or building riser links (up to ~2 km, typically).
• Industrial-grade power – Dual redundant 12–48 VDC inputs with reverse polarity protection, so a single supply fault doesn’t take down the switch.
• Alarm relay contact – Simple fault indication to a PLC or alarm light; commonly used for power failure notification.
• Rugged enclosure – IP30 metal housing with DIN-rail mounting keeps installation clean and resistant to vibration.
• Zero-config operation – Unmanaged, store-and-forward switching with auto MDI/MDI-X and auto-negotiation for straightforward drop-in replacements.
• Industrial temperature – Standard model operates from 0 to 60°C; most cabinets won’t need active cooling if ventilation is decent.
• Standards compliant – IEEE 802.3/802.3u/802.3x; typically accepted in factory and building networks alongside mainstream PLCs and HMIs.

Technical Specifications

Fiber reach depends on link budget, splicing, and connector cleanliness. For longer distances, a single-mode variant typically applies.

Application Fields

• Factory automation – Connect PLCs, HMIs, robots, and drives, while using fiber uplinks to tie remote panels together.
• Transportation and ITS cabinets – Often used to aggregate camera or controller traffic and backhaul via MM fiber.
• Water/Wastewater plants – Segment process areas and pump stations; the relay alarm helps with simple fault annunciation.
• Building systems – Elevators, HVAC, and access control networks that prefer no-config, rugged switches.
• Energy and utilities (low/medium voltage rooms) – Reliable, noise-tolerant links from bays to control rooms with fiber immunity to EMI.

A packaging OEM told us, “We dropped in the EDS-308-MM-SC to replace an old office-grade switch. The fiber SC ports made the cross-building run painless, and the alarm contact saved a needless callout.”

Advantages & Value

• Proven reliability – Fanless, metal, and widely deployed; it seems to run for years with minimal attention.
• Compatibility – Plays nicely with common PLC brands and legacy 100 Mbps devices; no management headaches.
• Cost control – Unmanaged design keeps purchase and lifecycle costs down; fewer settings means faster commissioning.
• Serviceability – Front-access terminals and LEDs simplify diagnostics; the relay contact provides a basic fault signal.
• Lifecycle stability – Industrial series often have long availability windows, helpful for standardization in projects.

Installation & Maintenance

• Panel/cabinet – Mount on a solid DIN rail; allow some space (typically 30 mm) for airflow on sides and access to the terminal block.
• Power wiring – Use a clean 12–48 VDC source; wire both redundant inputs when possible; earth ground the chassis to reduce EMI.
• Networking – Copper runs should follow CAT5e/CAT6 practices; for fiber, clean SC connectors and verify link budget for multi-mode spans.
• Safety – De-energize before wiring; check polarity; use proper fusing on DC feeds; keep low-voltage wiring separated from noisy loads.
• Routine checks – Inspect LED status, tighten terminals periodically, and clean fiber end-faces. No firmware to manage on this unmanaged model.

Quality & Certifications

• Certifications – CE, FCC Part 15 Class A, UL 508, RoHS (typical for this series).
• Manufacturer warranty – MOXA typically offers a 5-year limited hardware warranty on EDS switches.
• Supply guarantee – Our commercial warranty is 365 days as stated; shipping via FedEx/UPS/DHL with clear lead time commitments.

If your application needs the same footprint but different optics, variants with single-mode fiber or extended temperature (-T) are commonly available. You might notice that standardizing on the EDS-308 platform keeps spares simple across sites.