[c-nsp] 1811 DOT11-3-POWERS_INVALID

[Jeremy Parr]

I have a number (over a dozen) Cisco 1811s that have given up their
wireless adapters with the error:

*Oct 19 13:13:55: %DOT11-3-POWERS_INVALID: Interface Dot11Radio0, no
valid power levels available

Sometimes this occurs after an IOS upgrade, and rolling back to the
previous version will correct it. Cisco has claimed that each time it
is a hardware failure, and happily RMAs the unit, but the problem will
reoccur. This has been in the neighborhood of a 50% failure rate for
us. Standalone APs and 871Ws seem to work just fine, with only the
1811Ws being problematic. The config can be barebones simple, I have
tried hard coding antenna gains and power levels etc, but the
interface still stays in a "reset" state. It seems that somehow the
card or the router loses its country code, as I am able to configure
channels well above 2.4ghz ISM (FCC):

(config-if)#channel ?
  <1-2732>         One of: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 65535
65535 65535 65535 65535 65535 65535 65535 65535 65535 65535 65535 2412
2417 2422 2427
                   2432 2437 2442 2447 2452 2457 2462 2467 2472 2484
2512 2532 2552 2572 2592 2612 2632 2652 2672 2692 2712 2732
  least-congested  Scan for best frequency

Carrier busy test:
Frequency  Carrier Busy %
---------  --------------
   2412        100
   2417        100
   2422        100
   2427        100
   2432        100
   2437        100
   2442        100
   2447        100
   2452        100
   2457        100
   2462        100
   2467        100
   2472        100
   2484        100
   2512        100
   2532        100
   2552        100
   2572        100
   2592        100
   2612        100
   2632        100
   2652        100
   2672        100
   2692        100
   2712        100
   2732        100