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1142 802.11n Antenna and Power

I have a question that I would like to verify with you.  I have 1142 802.11n Autonomous APs, with antenna gain set to 0, how would i know the transmit default power of the AP?  I know this may sound an inappropriate question.  I am trying to do a coverage study and i would like to be as accurate as I can with my RF settings.

Thank you

2 ACCEPTED SOLUTIONS

Accepted Solutions

Yes it is MAXIMUM.. The default values will not get displayed in the running config!!

MAX = 24dBm

Lemme know if this answered ur question!!

Regards

Surendra

Regards
Surendra BG

View solution in original post

Thats nice to hear!! here is the list as well just for ur reference!!

Approximate Translation between mW and dBm

dBm

-1
2
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

mW

1
2
3
4
5
6
8
10
12
15
20
25
30
40
50
60
80
100
125
150
200
250
 

Regards

Surendra

Regards
Surendra BG

View solution in original post

8 REPLIES 8
Surendra BG
Cisco Employee

Hi,

The Transmitter power by default wil be set to the Maximum value..

Transmitter Power (Configured Power): -125811141720MaxPower Translation Table (mW/dBm)
Client Power (dBm): Local25811141720Max

MAX = 24 dBm i guess

Lemme know if this answered ur question!!

Regards

Surendra

Regards
Surendra BG

So right out of the box the transmitted power is set to maximum right?

This is the only thing I have from the configuration file.

All it mentions is the antenna gain.  Please see below.

antenna gain 0
mbssid
speed  basic-1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15.
station-role root
rts threshold 2312

Yes it is MAXIMUM.. The default values will not get displayed in the running config!!

MAX = 24dBm

Lemme know if this answered ur question!!

Regards

Surendra

Regards
Surendra BG

View solution in original post

Thank yuou thast answered the question. Thank you

Thanku and it was my pleasure assisting you!!

Regards

Surendra

Regards
Surendra BG

Are you positive that max is 24 ? That would mean that the radio could TX over 200+mW.

Spec for the 1142 state:

Available Transmit Power Settings

2.4GHz

20 dBm (100 mW)

17 dBm (50 mW)

14 dBm (25 mW)

11 dBm (12.5 mW)

8 dBm (6.25 mW)

5 dBm (3.13 mW)

2 dBm (1.56 mW)

-1 dBm (0.78 mW)

5GHz

20 dBm (100 mW)

17 dBm (50 mW)

14 dBm (25 mW)

11 dBm (12.5 mW)

8 dBm (6.25 mW)

5 dBm (3.13 mW)

2 dBm (1.56 mW)

-1 dBm (0.78 mW)

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps10092/datasheet_c78-502793.html

Please let me know becuase this is interesting to me ..

"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
___________________________________________________________

By the way 20dBm is 100mW, but I got what I am looking for.

20 = 10*log(Power/10) ==> Power = 10^(20/10) = 10^2 = 100mW

Thanks

Thats nice to hear!! here is the list as well just for ur reference!!

Approximate Translation between mW and dBm

dBm

-1
2
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

mW

1
2
3
4
5
6
8
10
12
15
20
25
30
40
50
60
80
100
125
150
200
250
 

Regards

Surendra

Regards
Surendra BG

View solution in original post

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