Allied Telesis AT-FS970M/16F8-LC, Installation Manual, Page: 50 / 106

Overview
50
Power Supplies
The following switches have one power supply:
 AT-FS970M/8
 AT-FS970M/8PS
 AT-FS970M/8PS-E
 AT-FS970M/24C
 AT-FS970M/24LPS
 AT-FS970M/48
These switches have two power supplies:
 AT-FS970M/16F8-LC
 AT-FS970M/16F8-SC
 AT-FS970M/24F
 AT-FS970M/24PS
 AT-FS970M/48PS
The power supplies have separate AC connectors on the back panels.
The power supplies are not field-replaceable.
The power supplies in the dual power supply switches operate in active
and standby states for all hardware operations, except for PoE. One
power supply is active, powering the switching functions of the device,
while the second power supply operates in a redundant state. The switch
automatically activates the redundant power supply 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 PoE, however, the power supplies in the AT-FS970M/24PS and
AT-FS970M/48PS Switches 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 97 for the input voltage range.
Warning
Power cord is used as a disconnection device. To de-energize
equipment, disconnect the power cord.
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