Allied Telesis AT-8100L/8POE User Manual

Chapter 1: Overview

54

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.

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