Siemens SCALANCE XR324-4M EEC Operating Instructions Manual page 28

Assembling
4.3 Installation of modular devices
Remember the orientation of media modules.
On modular devices, there are always two module slots arranged opposite each other.
Remember the correct orientation when installing MM900 media modules.
Example:
• Install the first media module in slot 1.
• Install the third media module turned through 180° in slot 2.
On modular devices for rack mounting, pairs of module slots are located one above the
other in which modules can be inserted in a specific order:
Example of a rack device:
• Install the first media module in slot 1.
• Install the third media module turned through 180° in slot 3.
Other modules are then installed in slot 2 and 4.
The permitted operating temperature is decided by the fully equipped device (switch +
media module + SFP transceiver).
With modular devices, it is not only the switch that decides the permitted operating
temperature of the overall device but also the temperature ranges of the MM900 media
modules and the SFP transceivers. You will find details in the technical specifications of the
relevant components.
The following aspects can restrict the maximum permitted operating temperature:
• The orientation of the carrier device.
• The use of SFP transceivers.
• The use of transceivers of the types LH, LH+ or ELH.
Note
SFP transceivers with the SCALANCE XR300M EEC
In contrast to the information in the product documentation for the SCALANCE MM900,
MM992-2SFP media modules can be operated in the SCALANCE XR300M EEC at ambient
temperatures up to a maximum of 70 °C if the following requirements are met:
• MM992-2SFP media modules as of hardware product version 02 are suitable. The
hardware product version can be found on the device. You can also read out this
information with the WBM or the CLI.
• The media modules MM992-2SFP can only be used in conjunction with the media
modules MM992-2CUC, MM992-2CU and MM992-2M12.
• Only the following SFP transceivers may be used:
– SFP991-1
– SFP991-1LD
– SFP992-1
– SFP992-1LD
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CAUTION
SCALANCE XR-300M EEC
Operating Instructions, 11/2015, A5E02661176-09