User's Manual

USER MANUAL FOR COMFLEX-6800
ENU STATUS : 1-0-0
Copyright - refer to title page
Page 66
Step 8: Click to enter to [Finish] page after finishing RU setup. Click to calibrate other
bands. Click if all bands’ clibration is done.
Figure 82: Commissioning Procedure – Finish
Note:
As the system calibration process is calibrated for single channel, so if there is more than one same band
input, because of the power superposition, the band total output power will higer than target DL output
power after the calibration is complete.
The calibration work is mainly to set device to reach it’s theoretical gain, so when there are two or more
same bands access into and they have the same input power level, each channel will reach it’s rated
power, so the total output power will be (input A+gain) + (inputB+gain)+…+(inputN+gain). For example, if
there are two 1900MHz bands acess to MU, each has 10dBm input power, the total output power of RU
1900MHz will be 46dBm+46dBm=49dBm.
For Multi-channel same band access, 800+850 (which share the same PA) access and 700 Uper C +
LowerABC (also shared PA), they all will have power superposition. In this situation, users need to adjust
system gain manually; otherwise, the output power will be higher than 48dBm which will trigger alarms
(See Chapter 6 for details).
Refer to the method below for the gain adjustment:
Suppose a band with N independent inputs, each input signal power are all X dBm. Apparently, there
exists the following relationship between input and output after finished auto communication on WEB GUI:
X dBm + Gain = 46dBm, then the total output power for N channels access is X dBm + Gain + 10*Log(N)
= 46 + 10*Log(N), so Users need to set 10*Log(N) RFU ATT on WEB GUI for each channel.
End of Section