User's Manual
Table Of Contents
- Cisco Aironet 1240AG Series Access Point Hardware Installation Guide
- Contents
- Preface
- Overview
- Installing the Access Point
- Safety Information
- Warnings
- Unpacking the Access Point
- Basic Installation Guidelines
- Controller Discovery Process for Lightweight Access Points
- Deploying the Access Points on the Wireless Network
- Mounting Overview
- Mounting on a Horizontal or Vertical Surface
- Mounting Below a Suspended Ceiling
- Mounting Above a Suspended Ceiling
- Mounting Access Point on a Desktop or Shelf
- Cable Security Bracket
- Attaching the Access Point to the Mounting Plate
- Securing the Access Point
- Connecting the Ethernet and Power Cables
- Powering Up the Access Point
- Troubleshooting 1240AG Series Autonomous Access Points
- Checking the Lightweight Access Point LEDs
- Checking Basic Settings
- Low Power Condition
- Running the Carrier Busy Test
- Running the Ping Test
- Resetting to the Default Configuration
- Reloading the Access Point Image
- Obtaining the Access Point Image File
- Connecting to the Access Point Locally
- Obtaining the TFTP Server Software
- Troubleshooting 1240AG Series Lightweight Access Points
- Guidelines for Using Cisco Aironet Lightweight Access Points
- Checking the Lightweight Access Point LEDs
- Low Power Condition for Lightweight Access Points
- Manually Configuring Controller Information Using the Access Point CLI
- Returning the Lightweight Access Point to Autonomous Mode
- Obtaining the Autonomous Access Point Image File
- Connecting to the Access Point Locally
- Obtaining the TFTP Server Software
- Translated Safety Warnings
- Declarations of Conformity and Regulatory Information
- Manufacturers Federal Communication Commission Declaration of Conformity Statement
- VCCI Statement for Japan
- Department of Communications—Canada
- European Community, Switzerland, Norway, Iceland, and Liechtenstein
- Declaration of Conformity for RF Exposure
- Guidelines for Operating Cisco Aironet Access Points in Japan
- Administrative Rules for Cisco Aironet Access Points in Taiwan
- Declaration of Conformity Statements
- Declaration of Conformity Statements for European Union Countries
- Access Point Specifications
- Channels and Maximum Power Levels
- Console Cable Pinouts
- Priming Lightweight Access Points Prior to Deployment
- Configuring DHCP Option 43 for Lightweight Access Points
- Glossary
- Index
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Cisco Aironet 1240AG Series Access Point Hardware Installation Guide
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Chapter 3 Troubleshooting 1240AG Series Autonomous Access Points
Low Power Condition
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 Lightweight Access Point
LEDs” section on page 3-2 and “Inline Power Status Messages” section on page 3-7).
Intelligent Power Management
The access point requires 12.95 W of power (up to 15.4 W with 100 m CAT 5 Ethernet cable) for full
power operation with both radios, but only needs 6.3 W of power when operating in low power mode
with both radios disabled. To help avoid an over-current condition with low power sources and to
optimize power usage on Cisco switches, Cisco developed Intelligent Power Management, which uses
Cisco Discovery Protocol (CDP) to allow powered devices (such as your access point) to negotiate with
a Cisco switch for sufficient power.
The access point supports Intelligent Power Management and as a result of the power negotiations, the
access point will either enter full power mode or remain in low power mode with the radios disabled.
Note Independent of the power negotiations, the access point hardware also uses the 802.3af classification
scheme to indicate the power required from the power source. However, the power source cannot report
the power available to the access point unless the power source also supports Intelligent Power
Management.
Some Cisco switches that are capable of supplying sufficient power require a software upgrade to
support Intelligent Power Management. If the software upgrade is not desired, you can configure the
access point to operate in pre-standard compatibility mode and the access point automatically enters full
power mode if these Cisco switches are detected in the received CDP ID field.
When the access point determines that sufficient power is not available for full power operation, an error
message is logged and the Status LED turns amber to indicate low power mode (see the
“Checking the
Lightweight Access Point LEDs” section on page 3-2 and the “Inline Power Status Messages” section
on page 3-7
).
Tip If your switch is capable of supplying sufficient power for full operation but the access point remains in
low-power mode, your access point or your switch (or both) might be misconfigured (see
Table 3-2 and
Table 3-3).
If your inline power source is not able to supply sufficient power for full operation, you should consider
these options:
• Upgrade to a higher-powered switch
• Use a Cisco Aironet power injector on the switch port
• Use the 48-VDC power module to locally power the access point