3Com VCX V7122 Installation Manual page 19

WARNING: Units providing power sockets with three pins must be
connected by service personnel to a socket-outlet with a protective
earthing connection.
To connect power when using a dual AC power cable:
1 Before connecting the dual AC power cable, see the cautionary note
below.
2 Attach one end of the supplied 100/240 VAC power cables to the rear
AC sockets and connect the other end to a separate earthed mains
circuits (for power source redundancy).
CAUTION: For the dual AC power supply note the following:
The LED on the left side of the chassis is only connected when the
■
dual AC is used. It is not relevant to the single AC power connection.
If only a single socket is connected to the AC power, (while the other
■
plug is left unconnected) the chassis' LED (on the left side) is lit red,
indicating that one of the dual power inlets is disconnected.
When both the AC power cables are connected, one of the plugs can
■
be disconnected under power without affecting operation, in which
case the chassis' left LED is lit red.
UPS can be connected to either (or both) of the AC connections.
■
The dual AC connections operate in a 1+1 configuration and provides
■
load-sharing redundancy.
Each of the dual power cables can be connected to different power
■
phases.
Cabling the V7122 19