User guide

Installing and Managing Power over Ethernet (PoE) Configuring Power over Ethernet Parameters
OmniSwitch 7700/7800 Hardware Users Guide April 2005 page 3-23
Important. Before changing the maximum slot-wide power allowance, you must disable PoE for the slot
via the lanpower stop command. Once the new value is assigned, re-enable PoE for the slot via the
lanpower start command.
To increase or decrease the total power allocated to a slot, use the lanpower maxpower command.
Because you are setting the power allowance for an individual slot, you must specify a slot number in the
command line. For example, the syntax
lanpower 3 maxpower 80
reduces the power allowance of the OS7-ENI-P24 module installed at slot 3 to 80 watts. This value is now
the maximum amount of power the slot can use to power all attached devices (until the value is modified
by the user).
Setting Port Priority Levels
Because not all Powered Devices (PDs) connected to the switch have the same priority within a customer
network setting, OS7700/OS7800 switches allow the user 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 ports is interrupted first (i.e., before critical and
high-priority ports).
• 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 ports 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 ports is
maintained as long as possible.
To change the priority level for a particular port, use the lanpower priority command. Because the switch
allows you to set priority levels on a port-by-port basis, be sure to specify slot/port information in the
command line. For example, the syntax
lanpower 8/22 priority critical
changes the priority value of port 22 of the OS7-ENI-P24 module installed at slot 8 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 operations.
Setting PoE Redundancy Status
The PoE feature has built-in hardware redundancy. PoE power redundancy status can be configured by the
user. Redundancy is disabled by default. To enable the feature, use the lanpower redundant-power
command. Enter the keyword enable in the command line, as shown:
-> lanpower redundant-power enable
To disable the feature, use the keyword disable in the command line:
-> lanpower redundant-power disable