Allied Telesis x530 Series - Figure 39: Switch Orientations in an Equipment Rack

x530 Series Installation Guide for Virtual Chassis Stacking
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You can use the different sets of holes on the switch to install the switch in
the equipment rack in a variety of orientations. You can install it with the
front panel flush with, extending in front of, or recessed behind the front of
the equipment rack. Refer to Figure 39.
Figure 39. Switch Orientations in an Equipment Rack