Allied Telesis AT-8100S/24 User Manual

Chapter 1: Overview

48

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.

Power cord is used as a disconnection device. To de-energize 
equipment, disconnect the power cord.  E3

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