Operation Manual

Fiber Distributed Antenna System (Fiber DAS)
91
FOR Opto Gain and Attenuation Settings
Figure 100
1
2
FOR Opto Gain Settings
Item Description
1
FOR gain in the downlink path. Range is typically from -20 to +20. FOR downlink path has inherent/raw gain of
+20dB (FM to 2600MHz).
 A setting of +20 indicates no attenuation so FOR will have +20dB gain (+20dB gain minus 0dB
attenuation).
 A setting of +10 will have 10 of attenuation so this stage will have 10dBm of gain (+20dB gain
minus 10dB of attenuation).
 A setting of 0 will have 20dB of attenuation so this stage will have unity gain (+20dB gain minus
20dB of attenuation).
 A setting of -10 will have 30dB of attenuation so this stage will have 10dB of loss (+20dB gain minus
30dB of attenuation).
 A setting of -20 will have 40dB of attenuation so this stage will have 20dB of loss (+20dB gain minus
40dB of attenuation).
2
FOR gain in the uplink path. Range is typically from 0 to +20dBm (FM to 2600MHz).
 A setting of +20 will have full gain of +20dBm.
 A setting of +10 will have +10dB gain.
 A setting of 0 will have no gain.
 Factory default should be used unless high loss in fiber. Note that changes in Gain uplink will
require changes in the FOR UL ALC level.