Hello Holger,
On Sat, 14 Nov 2009 19:45:43 +0100, "Holger Freyther" zecke@selfish.org wrote:
Good question. I think Dieter knows this best. We have two options that influence the transmit power. One is the power a mobile station should use to communicate with us ("ms max power") and then something I don't know ("max_power_red") but we do have links to the spec in the vty_interface.c
"max_power_red" is the power used by the BTS, it reduces the maximum power by a certain amount. Those are the results from a measurement I already posted a while ago to the list:
nanoBTS 1800, ARCN 840, no voice/data traffic:
NM_ATT_RF_MAXPOWR_R RF output
0 20 dBm 1 18 dBm 2 16 dBm 4 12 dBm 8 4.4 dBm 9 2.0 dBm 10 0.4 dBm 11 -1.6 dBm 12 -3.6 dBm
Please be aware that the value "max_power_red" from the config file is divided by two to get NM_ATT_RF_MAXPOWR_R ("max_power_red" is the actual reduction in dB).
Best regards, Dieter
Dear all, On Sat, Nov 14, 2009 at 08:42:44PM +0000, Dieter Spaar wrote:
Please be aware that the value "max_power_red" from the config file is divided by two to get NM_ATT_RF_MAXPOWR_R ("max_power_red" is the actual reduction in dB).
correct. This is also documented in the wiki at http://openbsc.gnumonks.org/trac/wiki/bsc_hack_VTY