Allied Telesis AT-8100 Series - Manual (Page 259)

AT-8100 Switch Command Line User’s Guide
259
be operated using either one power supply or both power supplies. One
power supply is responsible for providing 185 watts of the power budget.
Table 19 shows power budget per model.
Port
Prioritization
As long as the total power requirements of the PDs is less than the total
available power of the switch, it can supply power to all of the PDs.
However, when the PD power requirements exceed the total available
power, the switch denies power to some ports based on a process called
port prioritization.
The ports on the PoE switch are assigned to one of three priority levels.
These levels and descriptions are listed in Table 20.
Without enough power to support all the ports set to the same priority level
at one time, the switch provides power to the ports based on the port
number, in ascending order. For example, when all of the ports in the
switch are set to the low priority level, and the power requirements are
exceeded on the switch, port 1 has the highest priority level, port 2 has the
next highest priority level and so forth.
Table 19. PoE Switch’s Power Budget
Switch Model
When Using One
Power Supply
When Using Two
Power Supplies
AT-8100L/8POE 185W N/A
AT-8100S/24POE 185W 370W
AT-8100S/48POE 185W 370W
Table 20. PoE Port Priorities
Priority
Level
Description
Critical This is the highest priority level. Ports set to the Critical
level are guaranteed to receive power before any of the
ports assigned to the other priority levels.
High Ports set to the High level receive power only when all
the ports assigned to the Critical level are already
receiving power.
Low This is the lowest priority level. Ports set to the Low level
receive power only when all the ports assigned to the
Critical and High levels are already receiving power. This
level is the default setting.