Setting The Capacitor Detection Method; Understanding Guard Band - Alcatel-Lucent OmniSwitch 6465 Hardware User's Manual

Understanding Guard Band

Setting the Capacitor Detection Method

By default, the capacitor detection method is disabled. To enable it, use the
tion. For example:
-> lanpower slot 3/1 capacitor-detection enable
Note. The capacitive detection method should only be enabled to support legacy IP phones. This feature
is not compatible with IEEE specifications. Please contact your Alcatel-Lucent sales engineer or Customer
Support representative to find out which Alcatel-Lucent IP phones models need capacitive
detection enabled.
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 available 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.
page 4-8
Managing Power over Ethernet (PoE)
OmniSwitch 6465 Hardware Users Guide
lanpower capacitor-detec-
December 2019