Allied Telesis AT-x220-28GS, Installation Manual

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Chapter 2: Installation
20
Warning
Reliable earthing of rack-mounted equipment should be maintained.
Particular attention should be given to supply connections other than
direct connections to the branch circuits (e.g., use of power strips).
 E37
Caution
The unit does not contain serviceable components. Please return
damaged units for servicing.
 E42
Warning
The temperature of an operational SFP transceiver may exceed 70°
C(158° F) Exercise caution when removing or handling a transceiver
with unprotected hands.
 E43
Caution
An Energy Hazard exists inside this equipment. Do not insert hands
or tools into open chassis slots or plugs.
 E44
Warning
This equipment shall be installed in a Restricted Access location. 
E45