Allied Telesis 8100S Series - Manual (Page 48)

Chapter 1: Overview
48
Power Supplies
The switches are powered by two internal AC power supplies, except for
the AT-8100S/24C Switch, which has one power supply. The supplies are
not field-replaceable and each has a separate AC connector on the back
panels.
Only one power supply is active at a time in non-PoE switches. The
second power supply operates in a redundant state and is automatically
activated by the switch if the active power supply loses power or fails. The
change over is instantaneous, making it transparent to the network users.
Power redundancy is available only when both AC connectors on the
switch are connected to power sources.
For all operations excluding PoE, the power supplies in the AT-8100S/
24POE Switch operate in the same manner as those in the non-PoE
switches. One power supply operates in an active state while the other
resides in a redundant state.
For PoE, however, the power supplies operate in a load-sharing manner,
with each power supply providing 185 watts, half the total PoE budget of
the switch. The maximum 370 watts power budget of PoE is only available
when both power supplies are connected to power sources.
Refer to “Technical Specifications” on page 131 for the input voltage
range.
Warning
Power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord.
 E3
Warning
This unit might have more than one power cord. To reduce the risk
of electric shock, disconnect all power cords before servicing the
unit.
 E30