OmniSwitch 6865 Hardware Users Guide
46
Understanding Guard Band
Guard Band functionality is implemented when the switch has to provide power to a newly connected
PD. This functionality is more relevant on switches that have a lower amount of total PoE power
available for the switch but a higher default maximum PoE power available to some ports.
•
If the amount of power remaining is less than the port's configured maximum PoE power value or the
PD's class maximum power then the switch will not power up the PD.
•
This applies even if the newly connected PD actually requires less than the maximum power avail-
able for the port.
For example, assume the following:
•
There is 50W of PoE power remaining on the switch.
•
A newly connected PD only requires 4W of power.
•
The port's maximum PoE power value is 75W.
In this example the newly connected PD will not be powered on since the port's maximum PoE power
value is greater than the PoE power remaining on the switch.
To allow the PD to be powered, the port's maximum PoE value can be configured to be less than the
power remaining by issuing the following command to set the port's maximum PoE power to 10W:
-> lanpower power 1/1/1 power 10000
Using the previous example:
•
There is 50W of PoE power remaining on the switch.
•
A newly connected PD only requires 4W of power.
•
The port's maximum PoE power value is now 10W.
The newly connected PD will be powered on since the port's maximum PoE power value is now less than
the PoE power remaining on the switch.
The examples assume the new PD has the same or lower priority as the existing PDs, otherwise priority
disconnect will override.
The Guard Band functionality does not apply to PDs that are already powered up. However, priority
disconnect will apply if there's not enough power to power all PDs in the case of the power budget being
reduced, such as the removal of a power supply.
Please refer to the
“Understanding Priority Disconnect” on page 44
for additional details.
Содержание OmniSwitch 6865
Страница 1: ...Alcatel Lucent Enterprise OmniSwitch 6865 Hardware Users Guide Part No 060435 10 Rev F August 2017...
Страница 6: ...OmniSwitch 6865 Hardware Users Guide 2 1 Chassis and Power...
Страница 21: ...OmniSwitch 6865 Hardware Users Guide 17 2 Getting Started and Installation...
Страница 42: ...OmniSwitch 6865 Hardware Users Guide 38 3 Power Over Ethernet PoE...
Страница 51: ...OmniSwitch 6865 Hardware Users Guide 47 A Regulatory Compliance and Safety Information...
Страница 54: ...OmniSwitch 6865 Hardware Users Guide 50 China RoHS Hazardous Substance Table...
