Installation Guide

Draft 1A - CISCO CONFIDENTIAL
6-6
Cisco Aironet 1240AG Series Access Point Hardware Installation Guide
OL-7293-01
Chapter 6 Troubleshooting
Low Power Condition
If a wireless client is unable to authenticate with your access point, contact the system administrator for
proper security settings in the client adapter and for the client adapter driver and firmware versions that
are compatible with the access point settings.
Note The access point MAC address that displays on the Status page in the Aironet Client Utility (ACU) is
the MAC address for the access point radio. The MAC address for the access point Ethernet port is
printed on the label on the back of the access point.
Low Power Condition
Warning This product must be connected to a Power over Ethernet (PoE) IEEE 802.3af compliant power source
or an IEC60950 compliant limited power source. Statement 353
The access point can be powered from the 48-VDC power module or from an in-line power source. The
access point supports the IEEE 802.3af power standard, Cisco Pre-Standard PoE protocol, and Cisco
Intelligent Power Management for in-line power sources.
For full operation, the access point requires 12.95 W of power. The power module and Cisco Aironet
power injectors are capable of supplying the required power for full operation, but some inline power
sources are not capable of supplying 12.95 W. Also, some high-power inline power sources, might not
be able to provide 12.95 W of power to all ports at the same time.
Note An 802.3af compliant switch (Cisco or non-Cisco) is capable of supplying sufficient power for full
operation.
Note If your access point is connected to in-line power, do not connect the power module to the access point.
Using two power sources on the access point might cause the access point to shut down to protect internal
components and might cause the switch to shut down the port to which the access point is connected. If
your access point shuts down, you must remove all power and reconnect only a single power source.
On power up, the access point is placed into low power mode (both radios are disabled), Cisco IOS
software loads and runs, and power negotiation determines if sufficient power is available. If there is
sufficient power then the radios are turned on; otherwise, the access point remains in low power mode
with the radios disabled to prevent a possible over-current condition. In low power mode, the access
point activates the Status LED low power error indication, displays a low power message on the browser
and serial interfaces, and creates an event log entry (see the “Checking the Access Point LEDs” section
on page 6-2 and “Inline Power Status Messages” section on page 6-7).