cisco 1252 - questions about transmit power and TPC

[markus_stoneeh]

hello

i recently aquired an autonomous version of the 1252 access point with 2 radios

i have two questions:

1) if i for example select 17 db = 50mW for the transmit power, is this the total power level for the access point? or does it double when i use two transmit antennas? meaning 1 antenna = 17db = 50mW, 2 antennas = +3db = 20db = 100mW? this is very important for regulatory considerations

2) i cant find an option to enable or disable TPC (transmit power control). i hope this is enabled by default?

regards

markus

[Nicolas Darchis]

Hi,

The power you configure is the transmit power at the antenna connector. so it does not take into account the antenna gain.

Example : 17dbm at antenna connector = 23dbm in the air (EIRP) if you have a 6dbi antenna.

Even though there are 3 connectors for a radio, only 2 can transmit (3rd one is receive only), and the 17dbm is on each connectors.

For example in 11n, each "connector" would transmit a different signal (dual spatial stream) and each signal would be at 17dbm.

I don't think this matters for the regulation rules because these are 2 different transmitters so you should not stack up their power to see if you comply to rules.

Nicolas

===

Don't forget to rate answers that you find useful

[markus_stoneeh]

thanks for the answer. well i'll have to see whether maximum EIRP is per device or per transmitter

any idea about TPC?

regards,

markus

[Nicolas Darchis]

As far as I know, you enable it by typing "power local ...". Defining local power rules means you lower the power rules for your SSID (below regulation). That's basically doing TPC.

Nicolas

===

Don't forget to rate answers that you find useful