User's Manual

Preliminary Document
CI Wireless Inc. 11/19/99 2
Downlink Peak Power Limit
Switches
Power Limit (dBm) Six Seven Eight
20 off off off
18 on off off
16 off on off
14 on on off
12 off off on
10 on off on
8 off on on
6 on on on
Uplink Gain Offset, reduces uplink gain
Gain Offset (dBm) One Two
0 off off
-2 on off
-4 off on
-6 on on
If a unit is moved from one location to another pressing the reset switch will restart the
automatic set up feature. If the peak limit and uplink gain offset switches are preset when the
unit is installed the mini will first attempt to set itself up to the full RF output power of 20
dBm and then reduce power as instructed by the peak limit and uplink gain offset switches.
The Mini has a total of 30 dB of gain control in the uplink and downlink signal paths which is
controlled by the microprocessor. The microprocessor monitors the up link and down link
detected signal levels and adjusts the gain to prevent overdriving the linear power amplifier
circuits.
The mini monitors the downlink detected signal and adjusts the gain to achieve rated output
power, 20 dBm. The uplink attenuation is adjusted by the microprocessor to the same gain
level. Path loss is normally equal in both directions. The microprocessor continues to
monitor the detected output power on both paths to prevent overdrive. Should the downlink
detected power increase above the desired level, the processor will reduce the gain in both up
link and down link paths. A subscriber unit getting very close to the rerad antenna, may
causes uplink signal overdrive. The processor will temporarily reduce the gain in the up link
(reverse) path when uplink signal overdrive is sensed, which will reduce the coverage during
this condition. Proper placement of the rerad antenna will reduce the occurrence of this
condition.
The output power level setting and the maximum detected level, along with date and time, are
recorded in the history log file.