The GMM20-MMMMMMMMSZ9HHS9 module is an interchangeable media module for Fast Ethernet communication with rack mount switches. The module is designed and manufactured by Hirschmann and it connects to the power source of the host switch. It has a power consumption rating of 10 Watts and a power output rating of 34 BTU per hour.

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The catalog number GMM20-MMMMMMMMSZ9HHS9 is a product designation for an Ethernet media module that has been designed and manufactured by Hirschmann as part of the rack mount switches product line. The GMM20-MMMMMMMMSZ9HHS9 media module comes with 8 ports which include 4 different pairs of FE MM/SC ports. The module supports the usage of multi-mode fiber cables for the Ethernet networks in lengths of 0 to 5000 meters and 0 to 4000 meters. This media module is used to provide Fast Ethernet communication and it is part of the Hirschmann GREYHOUND1042 rack mount switch series. This interchangeable media module can be modified, expanded, and used to update the live network without negatively affecting communications. 


The Hirschmann GMM20-MMMMMMMMSZ9HHS9 media module draws its operating voltage from the host rack mount switch’s power source and the power consumption rating of the unit is 10 Watts. In addition to that, the power output rating of the unit is 34 BTU per hour as heat. The ambient relative humidity levels around the module should be kept between 5 and 95% (non-condensing), and the operating temperature of the module is from 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit). The temperature range for storage and transportation is -40 to 70 degrees Celsius (-40 to 158 degrees Fahrenheit). The GMM20-MMMMMMMMSZ9HHS9 media module weighs around 520 grams or 1.1 pounds. It comes with general instructions for safety procedures during operation and it complies with standards like the EN61131, EN60950, and EN55032 standards. The unit tolerates shocks of up to 15 g for 11 milliseconds duration, which equals a total of 18 shocks. The unit can also withstand moderate vibrations.  


Technical specifications


Rack Mount Switches



0 to 5000 meters and 0 to 4000 meters

Switch Backplane

10 Watts

34 BTU per Hour

520 grams (1.1 pounds)

0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)

-40 to 70 degrees Celsius (-40 to 158 degrees Fahrenheit)

5 to 95% (non-condensing)

Module, General Safety Instructions


Common misspellings:

Common misspellings: