Operation Manual

Fiber Distributed Antenna System (Fiber DAS)
89
FOR Opto Status
Figure 97 FOR Opto Status
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2
3
4
5
6
7
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Item Description
1
Optical power received from the FOI. See item 1 in Figure 98 for
measurement location.
2
Uplink signal being fed into the FOR uplink laser circuit. See item 2 in
Figure 99 for measurement location.
3 Laser current for the Remote Unit FOR. Should be less than 50mA.
4 Temperature of the Remote Unit FOR board.
5
Total gain of the FOR in the downlink. Note that RF Out 1 and 2 are wide
band (FM to 2600MHz) that feed band specific RF amplifiers in the following
VGA stage.
6
Total gain of the FOR in the uplink path. Note that RF In1 and In2 are wide
band (FM to 2600MHz) that are signals from the uplink frequency specific
amplifiers.
7
Calculated downlink signal being received from the FOI. See item 1 in
Figure 98 for measurement location. Takes into consideration optical
wavelength and temperature compensation.
8
Calculated uplink signal being transmitted to the FOI (FOR input from VGA +
FOR uplink gain/attenuation). See item 3 in Figure 99 for measurement
location.
Figure 98 FOR Downlink Schematic
CURRENT
SENSOR
ETHERNET
MODEM
OPTO IN
RX-LVL
RF OUT 1
RF OUT 2
PHOTO
DETECTOR
STEP ATT STEP ATT
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