Allied Telesis AT-GS950/16PS, User Manual

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AT-GS950/16PS Switch Web Interface User’s Guide
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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 7.
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 7. 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.