User's Manual Part 1

FiberDistributedAntennaSystem(FiberDAS)
17
Figure 14
DETECTOR
LASER
DRIVER
ETHERNET
MODEM
OPTO OUT
DETECTOR
MONITOR
TX-LVL
DL IN 1
DL IN 2
TP DL
STEP ATT
Attenuator 1
Downlink 1
Attenuator 1
Downlink 2
Attenuator 2
Downlink 1
Attenuator 2
Downlink 2
STEP ATT
STEP ATT
STEP ATT
FOI Downlink Block Diagram
TheRFdrivelevelsaremeasuredandaccessibleinthewebinterface.
TPDLisatestpoin
tmeasurementportforthedownlinkpath.TheRFlevelatTPDLwillbethesameastheinputto
theDLportsminustheGUIattenuatorsettings.
TPDL=“DLIN1"minus“At
t.1Downlink1"minus “Att.2Downlink1".
TPDL=“DLIN2"minus“Att.1D ownlink2"minus“Att.2Downlink2".
Example:Inputin
toDLis‐25dBmwiththeGUIsettingfor“Att.1Downlink1"of10andaGUIsettingfor“Att2
Downlink1"of0.Thetestpointmeasurementwillbe:‐25dB(input)minus10dB(attenuator#1)minus0dB
(attenuator#2)=‐35dBm.
Figure15 isablockdiagramshowingtheuplinkpathintheFOIandhowthetestportisconnected.Therear etwo
commonatten
uators,andtwouplinkattenuatorsthatcanbesetintheuplinkpath.
Figure 15 FOI Uplink Block Diagram
DETECTOR
DETECTOR
CURRENT
SENSOR
ETHERNET
MODEM
OPTO IN
RX-LVL
UL OUT 2
UL OUT 1
TP UL
Attenuator
Common 1
PHOTO
DETECTOR
Attenuator
Common 2
Attenuator
Uplink 1
Attenuator
Uplink 2
STEP ATT STEP ATT
STEP ATT
STEP ATT
RX POWER 1
RX POWER 2
TheULtestportontheFOIistappedbeforetheindividualuplinkpathattenuators.TheoutputlevelofTPULwillbe:
TP/UL[dB]=“At
t.Uplink1"setting‐20dB
TP/UL[dB]=“Att.Uplink2"setting‐20dB
Example:IftheFOIGUIse
ttingfor“Att.Uplink1"is0,thetestportuplinkpath1signalswillbe20dBlowerthanthe
uplinksignalonthe“ULOut1"port.
Example:IftheFO
IGUIsettingfor“Att.Uplink2"is20,thetestportuplinkpath2signalswillbeequaltotheuplink
signalson“ULOut2"port.