Description
Product Introduction
When an industrial network needs to bridge distant cabinets or connect equipment over fiber, the media interface must match the installed switch and the optical link. The Hirschmann MM20-Z6Z6Z6Z6SAHH is a four-port Fast Ethernet media module designed for compatible MICE modular switches. It provides four SFP slots for 100 Mbps fiber connectivity, with the optical transceivers purchased separately.
For maintenance teams, the critical checks are the host switch model, SFP type, fiber specification, and required transmission distance. This Hirschmann MM20 module draws power from the switch backplane rather than a separate field power supply. Since the model is listed as obsolete, confirm the exact part number, physical condition, and test status before planning a replacement.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Full Model | MM20-Z6Z6Z6Z6SAHH |
| Manufacturer | Hirschmann |
| Order Number | 943 938-001 |
| Product Type | Fast Ethernet media module |
| Product Family | MICE modular Ethernet switches |
| Port Count | 4 |
| Port Interface | SFP slots |
| Port Speed | 100 Mbps per port |
| Optical Transceivers | SFP modules ordered separately |
| Compatible Platforms | MS20, MS30, MS4128, subject to platform documentation |
| Power Source | Host switch backplane |
| Power Consumption | 4 W |
| Operating Temperature | 0°C to +60°C |
| Storage / Transport Temperature | −40°C to +70°C |
| Relative Humidity | 10%–95%, non-condensing |
| Mounting | Switch backplane |
| Protection Rating | IP20 |
| Dimensions | Approximately 38 × 134 × 118 mm |
| Lifecycle | Listed as obsolete by distributor sources |
Configuration note: The module provides the SFP slots, not the optical transceivers themselves. Select compatible SFPs according to the fiber type, wavelength, connector, link distance, and host-switch requirements. Do not assume that a gigabit-rated SFP or an arbitrary third-party transceiver will operate correctly in every configuration.
MM20-Z6Z6Z6Z6SAHH
Application Scenarios & Pain Points
Fiber-network problems are not always caused by a failed switch. Incorrect transceivers, mismatched fiber types, dirty connectors, and unsupported modules can all produce intermittent links or complete communication loss.
- Industrial control networks: Add fiber connectivity to compatible Hirschmann MICE switches serving PLCs, remote I/O, and supervisory systems.
- Cabinet-to-cabinet communication: Connect separated control panels using suitable optical transceivers and fiber infrastructure.
- Network maintenance: Replace a faulty four-port media module while retaining a compatible switch chassis.
- Legacy-system support: Maintain an existing MS20/MS30-based installation when the original module is no longer readily available.
Field note: If a port does not establish a link after replacement, check the SFP part number, fiber type, connector cleanliness, transmit/receive polarity, and link partner speed. Confirm compatibility before replacing the module again.
Related Products
The following are related Hirschmann network components. They serve different interface or network roles and are not automatically drop-in replacements for MM20-Z6Z6Z6Z6SAHH.
- M-Fast-SFP MM — Multimode fiber SFP option referenced for compatible media-module configurations. Verify the precise transceiver specification and supported link distance.
- M-Fast-SFP SM — Single-mode fiber SFP option for compatible optical links.
- M-Fast-SFP SM+ — Single-mode SFP variant listed for applicable link requirements; confirm optical specifications before selection.
- M-Fast-SFP LH — Long-haul single-mode optical transceiver option for compatible configurations.
- MM4-2TX/SFP — Two-port gigabit RJ45/SFP combination module for supported MS30 and MS4128 switches; different port count and speed.
- MM4-4TX/SFP — Four-port gigabit RJ45/SFP combination module listed for MS4128; not an assumed substitute for a four-port 100 Mbps SFP module.
- MM22-T1T1T1T1SAHH — Four-port RJ45 PoE module with external PoE power requirements; a different interface and application.
- MS20 / MS30 switch platforms — Host switch families that may accept this media module, depending on the specific chassis and configuration.
Engineer’s Guide: Field Pitfalls to Avoid
1. Ordering the module without confirming host-switch compatibility
A matching physical slot does not guarantee that every switch model or hardware revision supports the module.
Avoid it: Record the host switch’s exact model and hardware revision. Check the manufacturer’s compatibility documentation before ordering, particularly when maintaining an older MS20 or MS30 installation.
2. Selecting the wrong SFP or fiber type
A multimode transceiver cannot simply be substituted for a single-mode unit because both fit an SFP slot. Wavelength, optical budget, connector type, and link distance also matter.
Avoid it: Verify the SFP’s complete part number and match it to the installed fiber plant and remote transceiver. Clean and inspect fiber connectors, and use appropriate optical test equipment when diagnosing link faults.
3. Treating an obsolete module as tested operational stock
A legacy module may be unused, refurbished, previously installed, or untested. Appearance alone does not establish that all four ports work.
Avoid it: Request photographs of the actual module label, written condition classification, and test evidence. Where possible, verify that each port establishes a link using a compatible host switch and suitable SFPs before returning the network to service.
Frequently Asked Questions
Q1: What is Hirschmann MM20-Z6Z6Z6Z6SAHH used for?
It is a four-port Fast Ethernet media module that adds four 100 Mbps SFP interfaces to compatible Hirschmann MICE modular switches. The SFP transceivers are separate components.
Q2: Which switches support this module?
Catalog references identify the module for MS20, MS30, and MS4128 platforms. Confirm compatibility against the exact host-switch model and revision before installation.
Q3: Does the module include fiber-optic transceivers?
The published specification lists four SFP slots and indicates that the SFP modules are ordered separately. Make sure your purchase includes the correct transceivers if you need a complete installation package.
Q4: What power supply does MM20-Z6Z6Z6Z6SAHH require?
The module receives power through the host switch backplane and has a published power consumption of 4 W. It is not specified as a standalone module with its own field power input.
Q5: Is MM20-Z6Z6Z6Z6SAHH obsolete?
Distributor listings identify it as obsolete. Remaining availability may vary, so confirm actual stock, condition, and support options before relying on it for a long-term maintenance plan.
Q6: What should be tested before accepting a replacement?
Verify the model and order number, inspect the connector and PCB condition, and test each port with a compatible host switch and known-good SFP. Confirm link status and communications with the remote device. A visual inspection alone is not enough.
Q7: What information should I provide when requesting a quotation?
Provide the complete model , order number 943 938-001, host-switch model, required quantity, preferred condition, and delivery deadline. State whether you also need SFP transceivers, and request written confirmation of stock status, testing, warranty, and return terms.
