HIRSCHMANN MM20-M2M2T1T1EBH Media Module
HIRSCHMANN MM20-M2M2T1T1EBH Media Module
The HIRSCHMANN MM20-M2M2T1T1EBH is an industrial-grade, 4-port hybrid Fast Ethernet media module engineered for Hirschmann’s MICE (Modular Industrial Communication Equipment) series switches, specifically the MS20 and MS30 modular switch backplanes.
Featuring an even 50/50 split of 2 optical multimode fiber ports and 2 copper RJ45 ports, alongside an extended temperature rating and conformal coating, this module is purpose-built for harsh environments requiring local field device connection and fault-tolerant redundant fiber rings.
Unique Product Description
The MM20-M2M2T1T1EBH is a hot-swappable hybrid expansion module that combines short-range copper networking with long-range noise-immune optical communication. Its dual fiber interface makes it the ideal candidate for forming MRP (Media Redundancy Protocol) or HIPER-Ring redundant backbones, while its two copper ports connect directly to localized control hardware.
Decoding the Hirschmann MICE model number:
MM20: Media Module version for Fast Ethernet (100 Mbps) modular MICE switch families.
M2 M2: 2 x 100BASE-FX Multimode SC fiber optic ports (Ports 1 & 2).
T1 T1: 2 x 10/100BASE-TX RJ45 copper ports (Ports 3 & 4).
EBH: Extended Temperature range ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) with Backplane power integration and Hazardous area / Conformal Coating protection.
Product Advantages and Features
Balanced Hybrid Density: Eliminates the need to buy separate fiber-only and copper-only cards when both connectivity types are required in a single switch node.
Redundant Ring Architecture: The dual multimode optical ports allow direct integration into ring topologies (MRP / HIPER-Ring) to achieve sub-20ms network recovery times.
Extended Temperature & Conformal Coating: Rated for operation from $-40^\circ\text{C}$ to $+70^\circ\text{C}$. The conformal coating treats the circuit board to protect against moisture, dust, salt spray, and corrosive gases.
Electromagnetic Immunity: Fiber optic lines offer total galvanic isolation, preventing ground loops, surge damage, and EMI noise on uplink connections.
Hot-Swappable Backplane Integration: Can be inserted or replaced in live MS20/MS30 base units without bringing down network traffic on adjacent modules.
Technical Specifications Quick Reference
| Parameter | Specification |
| Product Line | Hirschmann MICE Media Module |
| Compatible Base Switches | MS20, MS30 Modular Base Units |
| Total Ports | 4 Ports (2 x Fiber + 2 x Copper) |
| Fiber Interface | 2 x 100BASE-FX Multimode Ports (Duplex SC Connectors) |
| Copper Interface | 2 x 10/100BASE-TX RJ45 Ports (Auto-negotiation, Auto-MDI/MDI-X) |
| Wavelength / Distance | 1300 nm / Up to 5 km ($50/125\,\mu\text{m}$) or 4 km ($62.5/125\,\mu\text{m}$) |
| Operating Temperature | $-40^\circ\text{C}$ to $+70^\circ\text{C}$ (Extended) |
| Protection | Conformal Coated PCB, IP20 Enclosure |
| Power Supply | Powered directly via MS20/MS30 backplane connection (~6W) |
Application Cases
Wind & Solar Energy Farms: Connects wind turbine nacelle controllers via copper while running long-distance fiber rings across turbines in extreme outdoor ambient temperatures.
Oil & Gas Refineries: Conformal coating and hazardous area certifications make it well-suited for volatile atmospheres and corrosive air conditions.
Transportation & Intelligent Traffic Systems (ITS): Links outdoor roadside control cabinets, CCTV cameras, and signals back to a central traffic management network over fiber.
Water & Wastewater Treatment: Isolates control panels across large physical footprints where ground potential differences could damage traditional copper cables.
Other Models in the Same Series
| Model | Port Configuration | Environmental / Feature Tier |
| MM20-M2M2T1T1EBH | 2 x Multimode SC + 2 x RJ45 | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coating |
| MM20-M2M2T1T1SAHH | 2 x Multimode SC + 2 x RJ45 | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) + Standard Approvals |
| MM20-M2T1T1T1EBH | 1 x Multimode SC + 3 x RJ45 | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coating |
| MM20-M2M2M2M2EBH | 4 x Multimode SC Fiber | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coating |
| MM20-T1T1T1T1EBH | 4 x RJ45 Copper Ports | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coating |
Installation and Maintenance
Installation Procedure
ESD Safety: Wear a grounded electrostatic discharge (ESD) wrist strap prior to handling the module.
Slot Alignment: Locate an unpopulated expansion slot on the target MS20 or MS30 basic unit and align the side guide rails.
Backplane Seating: Push the module steadily into the slot until its rear connector locks firmly into the backplane board.
Fastening: Tighten the captive thumb screws on the top and bottom of the faceplate to ensure proper grounding and shock/vibration resistance.
Cabling:
Connect Cat5e/6 industrial cables to the RJ45 ports.
Remove protective rubber dust caps from the SC ports and plug in multimode SC fiber cables (crossing Tx to Rx).
Maintenance & Troubleshooting
Dust Protection: Keep protective rubber plugs in any unused SC ports to avoid optics contamination.
Fiber Cleaning: Clean optical ferrules using an isopropyl alcohol cleaning pen if fiber port link LEDs fail to illuminate or experience high error rates.
Hot Swapping: To replace a live module, disconnect all network cables, loosen the top and bottom thumb screws, and gently pull the module straight out.