User Manual

IDRF (Integr ated Duplex er RX Filter) Chapter 5: IDRF R eplacement Procedure
IDRF (Integrated Duplexer RX Filter)
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IDRF Description
The IDRF is available in either the 800 MHz or 1.9 GHz RF band.
The IDRF (Integrated Duplexer RX Filter) includes:
• TX/RX bandpass filters
• Bi -directional TX and RX antenna path couplers.
The IDRF is a passive device requiring no DC input operating power .
The IDRF allows the sector TX and main RX RF carrier signals to share the same antenna. It
also allows connection for a sector diversity RX RF antenna. The bi -directional antenna couplers
provide forward and reflected signal port connections for antenna signal sampling and signal
injection. The coupled ports are typically used for connection to test equipment.
The UBS Macro BTS frame is typically equipped with one IDRF per sector . Figure 1 -2 Low
capacity UBS Macro BTS starter frame (1800 mm rack) on page 1 - 28 and Figure 1 -3 UBS
Macro BTS mid -capacity frame (1800 mm rack) on page 1 - 30 show the location of the IDRFs
within the UBS Macro frame.
Figure 1 -5 800 MHz IDRF I/O Details on page 1 - 32 and Figure 1 -6 1.9 GHz IDRF I/O Details on
page 1 - 33 show the locations of IDRF RF I/O port connectors.
System Impact/Considerations
P erforming this replacement procedure will cause downtime for all XMIs which will
suspend all call processing for the BTS .
The removal of a failed IDRF requires that all XMIs be dekeyed.
All of the XMIs will be disabled/locked to ensure that the transmitters are dekeyed. This will
interrupt all TX RF sector carriers.
Removal of the IDRF interrupts the associated sector TX/RX antenna paths.
Alarms will be reported during the replacement procedure.
A fter replacing an IDRF , the associated sector RX/TX paths must be optimized following the
procedure listed in the 1X UBS Macro BTS Optimization/A TP manual.
5 -2 68P09283A64 -3
FOA SEP 2007