The Hirschmann GRM20-TTTTTTTTSZ9HHS Greyhound Switch Media Module is a rack-mounted industrial Ethernet module. It is designed to provide a cost-effective switched network solution to entry-level applications. This media module offers 8 standard Fast 10/100 BASE-TX RJ45 twisted-pair ports.

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Warranty: 1 year Networking-Hardware Warranty Included
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Repairs: We offer repair service for the GRM20-TTTTTTTTSZ9HHS.
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The Hirschmann GRM20-TTTTTTTTSZ9HHS Greyhound series media module is a rack-mounted switch media module designed to provide a low-cost industrial Ethernet switch connection solution to industrial automation applications. The GRM20-TTTTTTTTSZ9HHS media module belongs to the Hirschman Greyhound series of 19-inch rack-mounted switches and media modules, and it is designed for harsh industrial conditions. The GRM20-TTTTTTTTSZ9HHS media module has a maximum port density of 8 twisted pair copper cable ports that expand the connection capabilities of a Greyhound switch. Each port has an RJ45 connector socket and it supports auto-negotiation, auto-crossing, and auto-polarity functions. The GRM20-TTTTTTTTSZ9HHS media module offers fast and seamless configuration, setup, and diagnostics via a command-line interface (station manager or PC) or via a USB configuration port. The user configuration data and the switch operating system can be saved and stored on an external flash-based configuration device and uploaded directly to save programming time and reduce overall commissioning time. 


The Hirschmann Greyhound GRM20-TTTTTTTTSZ9HHS media module has an RJ-45 V.24 Serial interface port for local connection to a PC or a station manager device. The GRM20-TTTTTTTTSZ9HHS media module has the CE, FCC, and EU Safety Standards approvals. It has a rated operating temperature range of 0 to 60 degrees Celsius and a working relative humidity range of 5 to 95% (non-condensing). The GRM20-TTTTTTTTSZ9HHS media module has a maximum power consumption rating of 2 Watts. Power is supplied via the host Greyhound switch, which delivers 48 to 54 Volts DC operating voltage over the power cable. The GRM20-TTTTTTTTSZ9HHS media module supports the Greyhound power supply configurator, which provides power over Ethernet (PoE and POE+) that conforms to IEEE 802.3af standard via twisted-pair Ethernet cables. The GRM20-TTTTTTTTSZ9HHS media module’s power supply powers end devices such as VoIP phones, Wireless Access Points (WAPs), and IP cameras rated at up to 180 Watts.


Technical specifications


Rack Mount Switches


Greyhound Switch Media Module

48 to 54 Volts DC

2.0 Watts




Rack Mount

8 Standard 10/100 BASE-TX RJ45

3-Pin Terminal Blocks

0 to 60 Degrees Celsius


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