HIRSCHMANN MM20-T1T1T1T1EBH 4-port Fast Ethernet Copper Cable Media Module
HIRSCHMANN MM20-T1T1T1T1EBH (order configurator code: MM20-T1T1T1T1EBHH) is an extended-environmental, hot-swappable 4-port Fast Ethernet copper Media Module designed for Hirschmann’s modular MICE Switch family (MS20 and MS30 series).
Featuring 4 x RJ45 ports (10/100Base-TX) combined with PCB conformal coating and an expanded temperature range, this module provides reliable local device connectivity in extreme industrial, chemical, and outdoor environments.
Product Overview
Hirschmann MM20-T1T1T1T1EBH is a heavy-duty, 4-port Fast Ethernet RJ45 media module engineered for harsh field communications within MS20/30 modular switches. Combining auto-negotiation and hot-swappable modularity with conformal coating protection, it enables continuous, high-reliability copper expansion across extreme thermal ranges and corrosive atmospheric conditions without interrupting live backplane operations.
Technical Parameter List
| Model Part Number | Port Types / Interfaces | Temperature & Protection Tier |
| MM20-T1T1T1T1EBH | 4 x 10/100Base-TX (RJ45) | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-T1T1T1T1SAHH | 4 x 10/100Base-TX (RJ45) | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-Z6Z6EBH | 4 x Fast Ethernet SFP Slots | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-Z6Z6SAHH | 4 x Fast Ethernet SFP Slots | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-M4M4T1T1 | 2 x Multimode SC + 2 x RJ45 | Hybrid Fiber/Copper Module |
| MM22-T1T1T1T1 | 4 x 10/100Base-TX (RJ45) | Power over Ethernet (PoE) Support |
Product Features & Core Advantages
Environmental Hardening (EBH Spec): Includes conformal coating across circuit boards to resist moisture, corrosive vapors, and conductive dust accumulation.
Hot-Swappable Architecture: Allows live insertion or removal from active MS20 or MS30 basic switch units, eliminating maintenance downtime for adjacent modules.
Direct Copper Integration: Provides 4 high-density RJ45 drops without needing separate SFP transceivers.
Auto-Crossing & Speed Sensing: Auto-MDI/MDI-X eliminates crossover cables, while auto-negotiation optimizes speed (10/100 Mbps) and duplex modes automatically.
Heavy EMC Immunity: High resistance to electromagnetic interference (ESD, surge, and fast transients) compliant with substation standards.
Environmental Tolerance Conditions
Operating Temperature Range: $-40^\circ\text{C}$ to $+70^\circ\text{C}$ (Extended Environmental Condition).
Storage Temperature Range: $-40^\circ\text{C}$ to $+85^\circ\text{C}$.
Relative Humidity: 10% to 95% (Non-condensing).
Conformal Coating: Applied to protect delicate components against chemical fumes, salt spray, and atmospheric condensation.
Shock & Vibration Resistance: Tested per IEC 60068-2-6 (vibration) and IEC 60068-2-27 (15g shock, 11 ms duration).
Model Classification
Within the Hirschmann MICE MM20/MM30 series, modules are classified by port type, speed, and environmental tier:
| Model Part Number | Port Types / Interfaces | Temperature & Protection Tier |
| MM20-T1T1T1T1EBH | 4 x 10/100Base-TX (RJ45) | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-T1T1T1T1SAHH | 4 x 10/100Base-TX (RJ45) | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-Z6Z6EBH | 4 x Fast Ethernet SFP Slots | Extended Temp ($-40^\circ\text{C}$ to $+70^\circ\text{C}$) + Conformal Coated |
| MM20-Z6Z6SAHH | 4 x Fast Ethernet SFP Slots | Standard Temp ($0^\circ\text{C}$ to $+60^\circ\text{C}$) |
| MM20-M4M4T1T1 | 2 x Multimode SC + 2 x RJ45 | Hybrid Fiber/Copper Module |
| MM22-T1T1T1T1 | 4 x 10/100Base-TX (RJ45) | Power over Ethernet (PoE) Support |
Installation Method
ESD Safety Prep: Put on an anti-static wrist strap connected to cabinet ground before unboxing the unit.
Backplane Insertion:
Locate an open media slot on the host MS20 or MS30 basic switch.
Slide the MM20-T1T1T1T1EBH smoothly along the guide rails until the backplane connector locks into place.
Mechanical Securing: Hand-tighten top and bottom captive thumbscrews on the faceplate to ground the module chassis to the switch rack.
Cabling: Insert industrial shielded twisted-pair (STP) Cat5e/Cat6 cables into the RJ45 jacks until the release tabs click.
Operating Instructions
Hot-Swap Operation: The module can be installed, swapped, or serviced while the parent switch remains powered. Network management software automatically detects the module status change.
Diagnostic LED Status Reading:
Link/Data LED (Green/Yellow): Solid indicates a valid link; flickering indicates active packet transmission.
Off: Inspect cable connections, verify connected end-device power, or test cable length limit (max $100\text{ meters}$).
Port Dust Management: Keep protective rubber plugs inserted in unpopulated RJ45 ports to maintain IP20 integrity and prevent dust or chemical vapor ingress.