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 ($-40^circtext{C}$ to $+70^circtext{C}$) 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 $-40^circtext{C}$ to $+70^circtext{C}$. 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

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

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.