Cisco Cisco 4402 Wireless LAN Controller

Power Injector Selection—This parameter enables you to protect your switch port from an 
accidental overload if the power injector is inadvertently bypassed. It appears if you check the Power 
Injector State check box above. Choose one of these options from the drop-down box to specify the 
desired level of protection:

Installed—This option examines and remembers the MAC address of the currently connected 
switch port and assumes that a power injector is connected. Choose this option if your network 
contains older Cisco 6-Watt switches and you want to avoid possible overloads by forcing a 
double-check of any relocated access points.

Each time an access point is relocated, the MAC address of the new switch port will fail 
to match the remembered MAC address, and the access point will remain in low-power 
mode. You must then physically verify the existence of a power injector and reselect this 
option to cause the new MAC address to be remembered.

Override—This option allows the access point to operate in high-power mode without first 
verifying a matching MAC address. It is acceptable to use this option if your network does not 
contain any older Cisco 6-Watt switches that could be overloaded if connected directly to a 
12-Watt access point. The advantage of this option is that if you relocate the access point, it 
continues to operate in high-power mode without any further configuration. The disadvantage 
of this option is that if the access point is connected directly to a 6-Watt switch, an overload will 
occur.

Foreign—This option causes the Injector Switch MAC Address parameter to appear. The 
Injector Switch MAC Address parameter allows the remembered MAC address to be modified 
by hand. Choose this option if you know the MAC address of the connected switch port and do 
not wish to automatically detect it using the Installed option.

This section contains important information to keep in mind when installing your controllers and access 
points.