HIRSCHMANN MM20-P9T1T1T1SAHH hot-swappable hybrid media module
Product Overview
The HIRSCHMANN MM20-P9T1T1T1SAHH is a hot-swappable hybrid media module engineered for Hirschmann’s MICE switch series (MS20 and MS30 basic switches).
Equipped with 1 × Single-Mode SC Fiber Port ($1300\text{ nm}$, up to $30\text{ km}$ distance) and 3 × RJ45 Copper Ports (10/100Base-TX), this module enables long-haul optical uplink transmission back to central control networks while serving local equipment via high-density copper drops.
2. Technical Parameter Table
| Parameter | Specification |
| Manufacturer | Hirschmann (Belden) |
| Product Series | MICE (Modular Industrial Communication Equipment) |
| Full Part Number | MM20-P9T1T1T1SAHH |
| Total Port Count | 4 Ports |
| Port 1 Interface | 1 × Single-Mode 100Base-FX (Duplex SC Connector, $1300\text{ nm}$) |
| Ports 2, 3, 4 Interfaces | 3 × Shielded RJ45 (10/100Base-TX, Auto-MDI/MDI-X, Auto-Negotiation) |
| Fiber Transmission Reach | Up to $30\text{ km}$ over $9/125\,\mu\text{m}$ single-mode optical fiber |
| Copper Reach | Up to $100\text{ m}$ over Cat5e/Cat6 STP cable |
| Backplane Power Draw | $\approx 4\text{ W} – 6\text{ W}$ directly via host MS20/30 switch frame |
| Protection Rating | IP20 (Industrial Enclosure) |
| Hot-Swappable | Yes (Live insertion/removal supported) |
3. Environmental Tolerance Conditions
Operating Temperature: $0^\circ\text{C}$ to $+60^\circ\text{C}$ (Standard industrial rating)
Operating Humidity: 10% to 95% (Non-condensing)
Vibration Resistance: Compliant with IEC 60068-2-6 ($1\text{g}$, $10\text{ Hz} – 150\text{ Hz}$)
Shock Immunity: Compliant with IEC 60068-2-27 ($15\text{g}$ shock, $11\text{ ms}$ duration)
EMC / Interference: Heavy industrial EN 61000-6-2 and EN 61000-4 series (ESD, Burst, Surge)
4. Operating Instructions
Installation Steps
ESD Grounding: Always wear an anti-static grounding wrist strap connected to cabinet earth before handling the module.
Module Alignment: Slide the MM20 card into the guide rails of an open media slot on the host MS20 or MS30 basic switch.
Mechanical Lock: Press firmly until the backplane connector locks in place. Hand-tighten top and bottom captive thumbscrews on the front faceplate to ensure chassis ground grounding.
Cabling: Attach single-mode duplex SC optical jumpers to Port 1 and RJ45 Ethernet patch cables to Ports 2. 3. and 4.
Hot-Swap Protection: You can safely pull or insert this module while the main switch is powered on without interrupting communications on adjacent switch slots.
5. Fault Diagnosis
| Symptom / LED | Possible Cause | Corrective Action |
| Fiber Link LED Off | TX/RX fiber pairs crossed, dirty optical face, or distance $>30\text{ km}$. | Swap SC connector strands (TX$\rightarrow$RX), clean fiber end-faces with lint-free wipes, check optical power budget. |
| Copper Port LED Off | Loose RJ45 plug, broken cable, or link partner powered down. | Re-seat patch cables, verify connected device status, test cable pinouts. |
| Module Unresponsive / All LEDs Off | Backplane pin misalignment or module loose in slot. | Loosen captive screws, extract module, re-align guide rails, push in firmly, and tighten screws. |
| High Collision / Packet Drops | Duplex mismatch on RJ45 ports (e.g., Half vs. Full duplex). | Ensure connected field devices are set to Auto-Negotiation or forced to matching speeds. |
6. Storage Conditions
Storage Temperature: $-40^\circ\text{C}$ to $+70^\circ\text{C}$ in original anti-static protective packaging.
Humidity Control: $< 95\%$ relative humidity (non-condensing).
Optical Dust Caps: Keep protective rubber plugs inserted inside the SC fiber port whenever not connected to prevent optical lens contamination.
7. Related Models of the Same Series
| Model Code | Port Configuration | Target Application |
| MM20-P9T1T1T1SAHH | 1 × Single-Mode SC Fiber + 3 × RJ45 Copper | Hybrid uplink + high local copper density |
| MM20-P9P9T1T1SAHH | 2 × Single-Mode SC Fiber + 2 × RJ45 Copper | Dual single-mode fiber ring/redundancy |
| MM20-M2M2T1T1SAHH | 2 × Multi-Mode ST Fiber + 2 × RJ45 Copper | Short-range multi-mode optical links ($< 5\text{ km}$) |
| MM20-T1T1T1T1SAHH | 4 × RJ45 Copper (10/100Base-TX) | All-copper local switch expansion |
| MM20-Z6Z6SAHH | 4 × Fast Ethernet SFP Slots | Flexible transceiver customization |
| MM20-T1T1T1T1EBH | 4 × RJ45 Copper (Extended Temp) | $-40^\circ\text{C}$ to $+70^\circ\text{C}$ extended rating + Conformal Coating |