Nortel SONET AccessNode User Manual page 18

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1-4 Safety guidelines and warnings
Power off
Protective grounding terminal
Alternating current
Direct current
AccessNode P0904244 Issue 1.0
This symbol indicates that a main power on/off switch is
on the off position.
This symbol indicates the location of a terminal that
must be connected to earth ground before you make
any other connections to the equipment.
This symbol indicates the location of a terminal that
supplies alternating current or to which a source of
alternating current is applied.
This symbol indicates the location of a terminal that
supplies direct current or to which a source of direct
current is applied.

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