User's Manual

Fiber Optics Powerwave
6 - 12 Rev. P1A9-Draft 2004-11 VM100 56/EN – User’s Manual
Legend:
Fixed values.
Set values via O&M software.
Calculated or resultant values.
Set and resultant UL gain
values in red.
High, medium, and low values
in the example.
Figure 6-10. Nine FORs, low optical loss, low total uplink gain
Figure 6-10 shows one of nine FORs connected to one of three FON units in the BMU
with low optical loss, medium uplink gain and high uplink attenuation. The BTS
sensitivity degradation is low.
Low total uplink gain decreases the BTS sensitivty with repeater under the BTS
sensitivity at the repeater antenna level, indicating a larger coverage area for the BTS
than for the FOR.
0dB
0dB
0dB
0dB
FON
BTS
BMU
DL
UL
FON
FOR
1 1
DPX
TX level
Total UL gain
RX Att. TX Att.
Fiber/WDM/
splitter loss
TX Att. RX Att.
UL gain
DL gain
Repeater noise figure
BTS sensitivity at
repeater antenna
Limited
repeater
TX level
Total DL gain
BTS initial
noise figure
BTS initial
sensitivity
BTS sensitivity
with repeater
BTS sensitivity
degradiation
Number of
repeaters
Fiber/WDM/
splitter loss
Coverage
areas
BTS
FOR
20dB
0dB
20dB
0dB
–10dB
40dBm
5dB
–107dBm
7.6dB
9
1.5dBm1.5dBm
1.5dBm 1.5dBm
20dB
20dB
65dB 68dB
–91.5dBm 33dBm
–7dB
5dB
20dB 20dB
–99.4dBm