User's Manual

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5.1.3 RF Interface at BIU
BIU can be connected with Bi-Directional Amplifier and Base Station Tranceiver.
To connect BIU with BDA, you need to use a duplexer or a circulator to separate TX/RX signals
from each other.
BIU can feed external TX/RX signals from the Back Plane.
Using MDBU separated from each carrier band, BIU can easily expand and interface with bands.
As seen in the table below, MDBU is divided into Single and Dual Bands. The unit can be
connected with two to four carrier signals per band. At the rear, #1~4 marks are seen in order
per MDBU. The following table shows signals to be fed to corresponding ports:
In/out RF Port
No Unit naming Description
TX RX
Port #1
800PS
TX(851~869MHz)
800PS
RX(806~824MHz)
1 800PS MDBU Single Band
Port#2
800PS
TX(851~869MHz)
800PS
RX(806~824MHz)
Port #3 850C TX(869~894MHz)
850C
RX(824~849MHz)
2 850C MDBU Single Band
Port#4 850C TX(869~894MHz)
850C
RX(824~849MHz)
Port#1
1900P
TX(1930~1995MHz)
1900P
RX(1850~1915MHz)
Port#2
1900P
TX(1930~1995MHz)
1900P
RX(1850~1915MHz)
Port#3
1900P
TX(1930~1995MHz)
1900P
RX(1850~1915MHz)
3 1900P MDBU Single Band
Port#4
1900P
TX(1930~1995MHz)
1900P
RX(1850~1915MHz)
4 AWS-1 MDBU Single Band
Port#1
AWS-1
TX(2110~2155MHz)
AWS-1
RX(1710~1755MHz)