Type 33 (Alcatel)

Good evening, Pix!
Reading docs I met one very interesting thing – counters, which belong to type 33 (electromagetic
emission measurements in the BTS):
E01 => EME_PWR_GSM: Average emitted power at the BTS antenna output connector for the
GSM frequency band (GSM850 or E-GSM or P-GSM). Counter coded in tenth of Watt.
E02 => EME_PWR_DCS: Average emitted power at the BTS antenna output connector for the
DCS frequency band (DCS1800 or DCS1900). Counter coded in tenth of Watt.

They look useful, but on order to use them in further work it would be excellent to understand how exactly they are measured. What is the principle of their functionig? Could you please say where I can find such info because that very limited description is all I’ve found:(

Many thanks in advance

Oh, one more question: are there any additional condition to activation this type of counter?

Thanks a million!