Allied Telesis AT-PWR3101 - Manual (Page 13)

AT-RPS3104 and AT-PWR3101 Installation Guide
13
AT-PWR3101 Module’s Operating Modes
The AT-PWR3101 module is not a load-sharing RPS unit. During normal
operations of the AT-8524POE switch, the AT-PWR3101 module
remains in stand-by mode. If the primary (internal) power supply in the
switch fails or stops receiving AC power from its external power source,
the RPS unit changes to operational mode, supplying power to the
switch and all powered devices connected to the ports on the switch. It
remains in the operational mode until the primary power supply in the
switch resumes operation, at which time the AT-PWR3101 module
automatically changes back to stand-by mode.
PoE Power Budgeting for Powered Devices
The Power over Ethernet (PoE) specifications of the AT-PWR3101
power supply module are identical to those of the primary (internal)
power supply in the AT-8524POE switch. The AT-PWR3101 module can
supply up to 15.4W per port for the PoE powered devices, with a
maximum total of 400 watts (W), same as the switch’s internal power
supply. Since the 400W of available power from the RPS module is
greater than the highest possible PoE requirements of the switch and its
power devices, no power budgeting is required. The AT-PWR3101
module can support all powered devices connected to a switch, even
when all 24 base ports are connected to powered devices and all
devices require the maximum 15.4W. (PoE is not supported on
expansion modules.) For further information on PoE, refer to the AT-S62
Management Software User’s Guide.