Low power warning for AIR-LAP1242AG-C-K9

Answered Question
Sep 12th, 2007
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Hi Buddie,

We purchased some AIR-LAP1242AG-C-K9 , but not perchasing any wireless controller. When I connect the LAP to Cat2950 or Cat2960 PPoE port, all the LAP can not boot normally. It indicates low power, please refer the two pictures attached. But if I use external power cable, the LAP can work well. So, I would like to know two things.

1. Can I use LAP standalone without using controller ?

2. If the above is Yes, how should I configure the PPoE on cat2950 to Support LAP correctly?

Thank you very much.



Correct Answer by Rob Huffman about 9 years 6 months ago

Hi Jian,


Q. Can an LAP operate independent of a wireless LAN controller (WLC)?


A. No, LAPs cannot function independent of WLCs. LAPs function in conjunction with a WLC only. The reason is that the WLC provides all the configuration parameters and firmware that the LAP needs in the registration process.


So you will need to either send the AP's back and get the IOS version, purchase a WLC or convert the LAP to IOS :(


Q. How do I distinguish between a regular (autonomous) AP and an LAP?


A. The easiest way to distinguish between a regular AP and a LAP is to look at the part number of the AP.


LAP (Lightweight AP Protocol [LWAPP])?Part numbers always begin with AIR-LAPXXXX.


Autonomous AP (Cisco IOS? Software)?Part numbers always begin with AIR-APXXXX.


From this good Q&A doc;


http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00806a4da3.shtml


You can convert an access point from lightweight mode back to autonomous mode by loading a Cisco IOS Release that supports autonomous mode (Cisco IOS release 12.3(7)JA or earlier). If the access point is associated to a controller, you can use the controller to load the Cisco IOS release. If the access point is not associated to a controller, you can load the Cisco IOS release using TFTP.


Using a TFTP Server to Return to a Previous Release


Follow these steps to revert from LWAPP mode to autonomous mode by loading a Cisco IOS release using a TFTP server:



--------------------------------------------------------------------------------


Step 1 The static IP address of the PC on which your TFTP server software runs should be between 10.0.0.2 and 10.0.0.30.


Step 2 Make sure that the PC contains the access point image file (such as c1200-k9w7-tar.122-15.JA.tar for a 1200 series access point) in the TFTP server folder and that the TFTP server is activated.


Step 3 Rename the access point image file in the TFTP server folder to c1200-k9w7-tar.default for a 1200 series access point, c1130-k9w7-tar.default for an 1130 series access point, and c1240-k9w7-tar.default for a 1240 series access point.


Step 4 Connect the PC to the access point using a Category 5 (CAT5) Ethernet cable.


Step 5 Disconnect power from the access point.


Step 6 Press and hold MODE while you reconnect power to the access point.


Step 7 Hold the MODE button until the status LED turns red (approximately 20 to 30 seconds) and then release.


Step 8 Wait until the access point reboots, as indicated by all LEDs turning green followed by the Status LED blinking green.


Step 9 After the access point reboots, reconfigure it using the GUI or the CLI.


From this doc;


http://www.cisco.com/en/US/products/hw/wireless/ps430/prod_technical_reference09186a00804fc3dc.html#wp161272


Hope this helps!

Rob






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Correct Answer
Rob Huffman Wed, 09/12/2007 - 04:58
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Hi Jian,


Q. Can an LAP operate independent of a wireless LAN controller (WLC)?


A. No, LAPs cannot function independent of WLCs. LAPs function in conjunction with a WLC only. The reason is that the WLC provides all the configuration parameters and firmware that the LAP needs in the registration process.


So you will need to either send the AP's back and get the IOS version, purchase a WLC or convert the LAP to IOS :(


Q. How do I distinguish between a regular (autonomous) AP and an LAP?


A. The easiest way to distinguish between a regular AP and a LAP is to look at the part number of the AP.


LAP (Lightweight AP Protocol [LWAPP])?Part numbers always begin with AIR-LAPXXXX.


Autonomous AP (Cisco IOS? Software)?Part numbers always begin with AIR-APXXXX.


From this good Q&A doc;


http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00806a4da3.shtml


You can convert an access point from lightweight mode back to autonomous mode by loading a Cisco IOS Release that supports autonomous mode (Cisco IOS release 12.3(7)JA or earlier). If the access point is associated to a controller, you can use the controller to load the Cisco IOS release. If the access point is not associated to a controller, you can load the Cisco IOS release using TFTP.


Using a TFTP Server to Return to a Previous Release


Follow these steps to revert from LWAPP mode to autonomous mode by loading a Cisco IOS release using a TFTP server:



--------------------------------------------------------------------------------


Step 1 The static IP address of the PC on which your TFTP server software runs should be between 10.0.0.2 and 10.0.0.30.


Step 2 Make sure that the PC contains the access point image file (such as c1200-k9w7-tar.122-15.JA.tar for a 1200 series access point) in the TFTP server folder and that the TFTP server is activated.


Step 3 Rename the access point image file in the TFTP server folder to c1200-k9w7-tar.default for a 1200 series access point, c1130-k9w7-tar.default for an 1130 series access point, and c1240-k9w7-tar.default for a 1240 series access point.


Step 4 Connect the PC to the access point using a Category 5 (CAT5) Ethernet cable.


Step 5 Disconnect power from the access point.


Step 6 Press and hold MODE while you reconnect power to the access point.


Step 7 Hold the MODE button until the status LED turns red (approximately 20 to 30 seconds) and then release.


Step 8 Wait until the access point reboots, as indicated by all LEDs turning green followed by the Status LED blinking green.


Step 9 After the access point reboots, reconfigure it using the GUI or the CLI.


From this doc;


http://www.cisco.com/en/US/products/hw/wireless/ps430/prod_technical_reference09186a00804fc3dc.html#wp161272


Hope this helps!

Rob






edisonwong Wed, 09/12/2007 - 17:26
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Dear Huffman,


Thank you, the issue has been resolved.


We converted to AP IOS mode and select the Power Injector mode (system power settings)

then everything is OK.

vjohnmoses Sun, 12/02/2007 - 21:20
User Badges:

HI,

I too faced the same problem cuuple of days ago, could crack the problem, but with the AP,


1.install power injector in between th AP and switch.

2.issue the command "power inline negotation injector installed" at the config mode of the AP ,

3. do not forget to restart the switch, if not the power injector will not detected by switch .

I am post this just for info sake


pl get back for any other queries






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