HIRSCHMANN MM20-Z6T1T1T1EBH Fast Ethernet media card.
Here is a technical overview for the HIRSCHMANN MM20-Z6T1T1T1EBH modular Fast Ethernet media card.
Unlike the previously discussed standard-temperature unit (SAHH), this specific model features Hirschmann’s EBH environmental hardening specification, combining an extended operating temperature range with conformal PCB coating for protection against harsh chemical and outdoor conditions.
Product Introduction / Overview
The HIRSCHMANN MM20-Z6T1T1T1EBH is an industrial-grade, 4-port Fast Ethernet media module designed for Belden Hirschmann MICE (MS20/MS30 series) modular Ethernet switches.
It features a hybrid port layout—1 x Fast Ethernet SFP slot (Z6) and 3 x 10/100Base-TX RJ45 copper ports (T1T1T1). Engineered for high-reliability environments, the EBH tier adds conformal PCB coating (to resist conductive dust, corrosive vapors, and high humidity) and an extended temperature range ($-40^\circ\text{C}$ to $+70^\circ\text{C}$).
Technical Table
| Attribute | Specification |
| Manufacturer | Belden / Hirschmann |
| Product Line | MICE Series Media Modules (MS20/MS30 compatible) |
| Part / Model Number | MM20-Z6T1T1T1EBH (Config code: MM20-Z6T1T1T1EBHH) |
| Port Configuration |
• 1 x Fast Ethernet SFP Slot (100 Mbps) • 3 x RJ45 Ports (10/100Base-TX) |
| Copper Port Function | Auto-Negotiation, Auto-MDI/MDI-X (Auto-Crossover) |
| SFP Slot Function | Accepts Hirschmann M-FAST SFP transceivers |
| Board Protection | Conformal Coated (Protective resin coating over PCBs) |
| Backplane Support | Hot-swappable live insertion/removal |
| Ingress Rating | IP20 |
| Power Consumption | Approx. $2.3\text{ W}$ (supplied via switch backplane) |
Environmental Tolerance Conditions
Operating Temperature: $-40^\circ\text{C}$ to $+70^\circ\text{C}$ (Extended Range)
Relative Humidity: 10% to 95% (non-condensing)
PCB Protection: Conformal coating against moisture, salt spray, conductive dust, and corrosive airborne contaminants.
Vibration Resistance: Tested per IEC 60068-2-6 ($1\text{g}$, 10 Hz–150 Hz)
Shock Resistance: Tested per IEC 60068-2-27 ($15\text{g}$ shock, 11 ms duration)
Operating Instructions
Hot-Swap Insertion: Locate an open bay on the MS20 or MS30 switch. Slide the card along the guide rails into the backplane until firmly seated.
Mechanical Fastening: Tighten top and bottom captive thumbscrews on the faceplate to ground the module body to the switch chassis.
SFP & Copper Connection: Insert the M-FAST SFP transceiver into the Z6 port until locked, then attach optical cables. Insert RJ45 Cat5e/Cat6 STP cables into the T1 ports until the tab clicks.
Unused Port Protection: Keep rubber protective plugs over unpopulated SFP slots and RJ45 jacks to avoid dust accumulation inside IP20 cabinets.
Fault Diagnosis
| LED Symptom | Possible Cause | Troubleshooting Action |
| Link/Data LED Off | Physical link fail, broken cable, or unpowered remote device. | Check line continuity; verify remote end is powered; check copper length ($\le 100\text{ m}$). |
| SFP Link Off | Unseated SFP, dirty fiber connector, or optical wavelength mismatch. | Reseat SFP module; clean fiber end-faces; confirm TX/RX fiber polarity and SFP compatibility. |
| Intermittent Dropped Packets | Cable damaged, excessive EMI, or duplex/speed mismatch. | Use shielded cables (STP); check switch management log for port speed/duplex errors. |
| Module Unresponsive | Poor backplane connection. | Loosen thumbscrews, unseat the module, and firmly re-seat it into the switch backplane. |
Related Models of the Same Series
The MICE MM20/MM30 series allows mixing and matching port types and environmental tiers:
| Model Part Number | Port Layout | Environmental / Temp Grade |
MM20-Z6T1T1T1EBH (This Model) |
1x SFP + 3x RJ45 | Extended ($-40^\circ\text{C}\text{ to }+70^\circ\text{C}$) + Conformal Coating |
MM20-Z6T1T1T1SAHH |
1x SFP + 3x RJ45 | Standard ($0^\circ\text{C}\text{ to }+60^\circ\text{C}$), Uncoated |
MM20-T1T1T1T1EBH |
4x RJ45 Copper | Extended ($-40^\circ\text{C}\text{ to }+70^\circ\text{C}$) + Conformal Coating |
MM20-Z6Z6EBH |
4x SFP Slots | Extended ($-40^\circ\text{C}\text{ to }+70^\circ\text{C}$) + Conformal Coating |
MM20-M4M4T1T1 |
2x Multimode SC + 2x RJ45 | Hybrid Fiber/Copper Module |
MM22-T1T1T1T1 |
4x RJ45 Copper | Supports Power over Ethernet (PoE) |
Storage Conditions
Storage Temperature: $-40^\circ\text{C}$ to $+85^\circ\text{C}$ ($-40^\circ\text{F}$ to $+185^\circ\text{F}$)
Storage Relative Humidity: 5% to 95% (strictly non-condensing)
Packaging: Keep inside anti-static ESD packaging until immediate installation to protect delicate backplane connectors.