Understanding Guard Band Managing Power over Ethernet (PoE)
page 4-8 OmniSwitch 6560 Hardware Users Guide December 2019
Note. Changing the maximum power available to a slot or port does not reserve or immediately allocate
that power. These settings are only used for configuring a maximum amount of power that may be used,
any unused power is still available and remains a part of the overall PoE budget.
Setting Port Priority Levels
As not all Powered Devices (PDs) connected to the switch have the same priority within a network setting,
the OmniSwitch allows the administrator to specify priority levels on a port-by-port basis. Priority levels
include low, high, and critical. The default priority level for a port is low.
• Low. This default value is used for port(s) that have low-priority devices attached. In the event of a
power management issue, inline power to low-priority is interrupted first (i.e., before critical and high-
priority).
• High. This value is used for port(s) that have important, but not mission-critical, devices attached. If
other ports in the chassis have been configured as critical, inline power to high-priority is given second
priority.
• Critical. This value is used for port(s) that have mission-critical devices attached, and therefore require
top (i.e., critical) priority. In the event of a power management issue, inline power to critical is main-
tained as long as possible.
To change the priority level for a particular port, use the lanpower priority command. Since the switch
allows you to set priority levels on a port-by-port basis, be sure to specify chassis/slot/port information in
the command line. For example, the syntax
-> lanpower port 1/1/6 priority critical
changes the priority value of port 6 to the highest priority level of critical. Now that the default value has
been reconfigured, this port should be reserved for those PDs that are mission critical for network opera-
tions.
Setting the Capacitor Detection Method
By default, the capacitor detection method is disabled. To enable it, use the lanpower capacitor-detec-
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.
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