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Understanding Priority Disconnect Installing and Managing Power over Ethernet (PoE)
page 3-10 OmniSwitch 6600 Family Hardware Users Guide September 2006
Priority Disconnect is Enabled; Same Priority Level on All PD Ports
Reminder. Priority disconnect examples are only applicable when there is inadequate power remaining to
power an incoming device.
When a PD is being connected to a port with the same priority level as all other ports in the slot, the physi-
cal port number is used to determine whether the incoming PD will be granted or denied power. Lower-
numbered ports receive higher priority than higher-numbered ports. In other words, a PD connected to
Port 1 will have a higher power priority than a PD connected to Port 2; a PD connected to Port 23 will
have a higher power priority than a PD connected to Port 24. In order to avoid a power budget deficit,
another port in the slot is disconnected. In determining which port to power off, the system software
disconnects the port with the highest physical port number.
Priority Disconnect is Enabled; Incoming PD Port has Highest Priority Level
Reminder. Priority disconnect examples are only applicable when there is inadequate power remaining to
power an incoming device.
When a PD is being connected to a port with a higher priority level than all other ports in the slot, the
incoming PD will automatically be granted power over the other devices, regardless of its physical port
number.
In order to avoid a power budget deficit, another port in the slot is disconnected. In determining which port
to power off, the system software first selects the port with the lowest configured priority level. For exam-
ple, if a critical priority device is being added to a slot in which five existing devices are attached to high
priority ports and one device is attached to a low priority port, the low priority port is automatically
disconnected, regardless of its physical port number.
If all existing devices are attached to ports with the same lower priority level, the system software discon-
nects the port with both the lowest priority level and the highest physical port number. For example, if a
critical priority device is being added to a slot in which six existing devices are attached to high priority
ports, the high priority port with the highest physical port number is automatically disconnected.
Priority Disconnect is Enabled; Incoming PD Port has Lowest Priority Level
Reminder. Priority disconnect examples are only applicable when there is inadequate power remaining to
power an incoming device.
When a PD is being connected to a port with a lower priority level than all other ports in the slot, the
incoming PD will be denied power, regardless of its physical port number. Devices connected to other
higher-priority ports will continue operating without interruption.