Allied Telesis 8100S Series - Manual (Page 54)

Chapter 1: Overview
54
Power Supplies
The 8100L Series switches have one AC power supply. The 8100S Series
switches have two AC or DC power supplies, except for the AT-8100S/
24C Switch, which has one AC power supply. The supplies are not field-
replaceable and each has a separate AC or DC connector on the back
panels.
Only one power supply is active at a time in non-PoE 8100S Series
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 dual power supplies in the
AT-8100S/24POE and AT-8100S/48POE Switches 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 107 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