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3-12
Cell Site Layouts
411-2021-111 Standard 01.01 June 1996
Transmit cabling
In the transmit path, the output of each Transmit Receive Unit (TRU) is
connected to the input of each corresponding power amplifier (PA) on the
Dual Power Amplifier (DPA) module.
For a 120
°
STSR cell site with one RF Frame, each TRU/DPA Shelf and its
associated ATC and duplexer serve for one of the three sectors; TRU/DPA
Shelf 1, ATC 1 and Duplexer 1 for Sector X, TRU/DPA Shelf 2, ATC 2 and
Duplexer 2 for Sector Y and TRU/DPA Shelf 3, ATC 3 and Duplexer 3 for
Sector Z. The output of each power amplifier (PA) is input to an 8-channel
AutoTune Combiner (ATC). The output of each 8-channel ATC is connected
to the Transmit (TX) port of each corresponding duplexer. Table 3-5 lists the
connection between the PAs and the ATC for a 120
°
STSR cell site using one
RF Frame for three sectors.
For a 120
°
STSR cell site with three RF Frames, each frame serves for one of
the three sectors; RF Frame 1 for Sector X, RF Frame 2 for Sector Y and RF
Frame 3 for Sector Z. With an RF Frame holding up to 20 channels, only one
duplexer is required. With 21 or more channels in one RF Frame, two
duplexers are required. Table 3-6 lists the connection between the PAs and the
ATC for an RF Frame with up to 20 channels. Table 3-7 lists the connection
between the PAs and the ATC for an RF Frame with 21 channels or more.
Table 3-5
PA to ATC connection for a 120
°
Metrocell with one RF Frame
From Through To
DPA 1 - Port1 (CCH) ATC1 - Port 1
DPA 1 - Port2 ATC1 - Port 2
DPA 2 - Port1 ATC1 - Port 3
TRU/DPA
Shelf 1
DPA 2 - Port2 (LCR) ATC Shelf 1 ATC1 - Port 4 Duplexer
Position 1
Antenna
(Main receive
for Sector X)
DPA 3 - Port1 ATC1 - Port 5
DPA 3 - Port2 ATC1 - Port 6
DPA 4 - Port1 ATC1 - Port 7
DPA 4 - Port2 ATC1 - Port 8
DPA 5 - Port1 (CCH) ATC2 - Port 1
DPA 5 - Port2 ATC2 - Port 2
DPA 6 - Port1 ATC2 - Port 3
TRU/DPA
Shelf 2
DPA 6 - Port2 (LCR) ATC Shelf 2 ATC2 - Port 4 Duplexer
Position 2
Antenna
(Main receive
for Sector Y)
DPA 7 - Port1 ATC2 - Port 5
DPA 7 - Port 2 ATC2 - Port 6
DPA 8 - Port1 ATC2 - Port 7
DPA 8 - Port 2 ATC2 - Port 8