AT&T MERLIN LEGEND Release 3.1 System Manager's Manual page 39

Environmental Requirements
Do not place anything that could block ventilation on top of or around the
carriers.
Do not install the control unit under any device that may drip fluid, such
as an air conditioner.
For maintenance purposes, the control unit should be mounted in an
accessible location. There should be sufficient room and lighting
available to remove the cover(s) and replace modules without moving
furniture, boxes, or other objects.
For more information, refer to the Equipment and Operations Reference or
contact your AT&T representative.
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