HIRSCHMANN MM20-Z6Z6EBH Hot-swappable fast Ethernet media module
The HIRSCHMANN MM20-Z6Z6EBH (often formatted in order configurators as MM20-Z6Z6Z6Z6EBHH or MM20-Z6Z6EBH…) is an extended environmental spec, hot-swappable Fast Ethernet Media Module. It is engineered for Hirschmann’s modular MICE (Modular Industrial Communication Equipment) Switch family (MS20 and MS30 series).
The EBH designation indicates an Extended Environmental variant with conformal coating for harsh outdoor or chemical environments, featuring 4 Fast Ethernet (100 Mbps) SFP slots for versatile fiber and copper transceiver deployment.
Product Overview
Hirschmann MM20-Z6Z6EBH is a 4-port Fast Ethernet SFP media module built to provide resilient, customizable optical or copper connectivity within MS20/30 modular switches. Designed for extreme operating conditions, it combines dynamic hot-swap capability with PCB conformal coating, enabling reliable network expansion in harsh industrial, utility, and outdoor environments without bringing down active backplane communication.
Technical Table
| Parameter | Specification |
| Product Type | Fast Ethernet MICE Media Module |
| Model Code | MM20-Z6Z6EBH (Full Code: MM20-Z6Z6Z6Z6EBHH) |
| Port Configuration | 4 x Fast Ethernet SFP Slots (100 Mbps per port) |
| Supported Transceivers | Fast Ethernet SFPs (Single-mode, Multi-mode, Long-haul, RJ45 SFP) |
| Power Supply | Powered directly via MS20/MS30 switch backplane |
| Power Consumption | $\approx$ 8 Watts (Max output ~27.3 BTU/h) |
| Enclosure Rating | IP20 (Industrial Housing) |
| Dimensions (W x H x D) | $38 \times 134 \times 118\text{ mm}$ |
| Hot-Swappable | Yes (Dynamic backplane insertion/removal) |
| Diagnostic Indicators | LEDs for Power, Link Status, Data Traffic, and Duplex |
| Certifications | cUL 508, ISA 12.12.01 Class 1 Div 2, CE, EN 61000-4 series |
Environmental Tolerance Conditions
Operating Temperature (Extended): $-40^\circ\text{C}$ to $+70^\circ\text{C}$ (EEC / Extended variant designation).
Storage Temperature: $-40^\circ\text{C}$ to $+85^\circ\text{C}$.
Relative Humidity: 10% to 95% (Non-condensing).
Conformal Coating (EBH designation): PCB surfaces are treated with a protective coating to guard against corrosion caused by humidity, airborne chemicals, and industrial contaminants.
Vibration & Shock Resistance: Tested to IEC 60068 standards (up to 15g shock duration at 11 ms).
Electromagnetic Immunity (EMC): Compliant with EN 61000-4-2 (ESD), EN 61000-4-4 (Burst), and EN 61000-4-5 (Surge) for heavy industrial electrical substations and plants.
Operating Instructions
Pre-Installation Inspection & ESD: Wear an anti-static ESD wrist strap prior to opening packaging or handling the module.
Backplane Insertion:
Ensure the slot on the host MS20 or MS30 basic switch module is clean and clear.
Slide the module evenly into the guide rails until the backplane connector engages firmly.
Hand-tighten top and bottom captive thumbscrews on the front plate.
SFP Installation:
Insert compatible Hirschmann Fast Ethernet SFP transceivers into the SFP slots until they latch.
Remove rubber dust caps and attach fiber optic or LC/copper cables.
Hot-Swap Operation: The module can be installed or removed while the host switch is energized. Network topology changes will automatically update via the switch management software (e.g., HiOS or Classic Software).
Fault Diagnosis
| LED / Symptom | Possible Cause | Corrective Action |
| Link LED Off | No physical layer signal detected | Check SFP seating, verify cable polarity (Tx/Rx reversal), or inspect fiber ends for contamination. |
| Power LED Off | Backplane contact failure or power drop | Ensure thumbscrews are tightened; verify host switch power modules (P1/P2) are operating. |
| Yellow/Blinking LED | High collision rate / duplex mismatch | Verify auto-negotiation settings in switch web interface; ensure connected device matches SFP duplex mode. |
| Intermittent Dropped Packets | Dirty optical connectors or signal loss | Clean optical fiber connectors with an optical cleaning pen; verify fiber loss budget with an OTDR/power meter. |
Storage Conditions
Temperature Range: $-40^\circ\text{C}$ to $+85^\circ\text{C}$ in original manufacturer packaging.
Atmospheric Protection: Keep stored in a dry, dust-free indoor location. Maintain dust covers on all unused SFP slots to prevent fiber port contamination.
Humidity: Max 95% relative humidity without liquid condensation.
Related Models in the Same Series
| Model Part Number | Media / Port Configuration | Temperature / Feature Coating |
| MM20-Z6Z6EBH | 4 x Fast Ethernet SFP Slots | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coating |
| MM20-Z6Z6SAHH | 4 x Fast Ethernet SFP Slots | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-T1T1T1T1 | 4 x 10/100Base-TX (RJ45 Copper) | Standard Industrial Copper |
| MM20-M4M4T1T1 | 2 x Multimode SC Fiber + 2 x RJ45 | Hybrid Fiber/Copper Module |
| MM22-T1T1T1T1 | 4 x 10/100Base-TX (RJ45) | Power over Ethernet (PoE) Support |
| MM30-00J6J6SAHH | Gigabit SFP & Fast Ethernet Combo | High-Speed Uplink Module |