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BTS 1 – Starter
Ttl #
Ttl #
Con–
Con–
4812
Sec
Sec
VH
Trnk
4812
fig
fig
Car
Car
LPAs
Mod
DBPF
Cmbr
8
24
16
4
NA
car
4
24
16
4
NA
car
NOTES: Tx combiners typicalln not used until system exceeds 2 carriers.
Duplexed diversity Rx antennas are routed to DRDCs in expansion frame and then diversity Rx expansion is routed back to starter frame.
Tx paths are NOT routed between expansion and starter frames (i.e. each frame must have its own Tx antennas which reduces loss).
When expansion frame is added, the unused DRDCs in the starter frame could be removed and replaced with cover plates, but it is not recommended due to the time involved.
BTS 1 – Starter
Ttl #
Con–
4812
Sec
VH
Trnk
4812
fig
Car
LPAs
Mod
DBPF
Cmbr
3 Sector
1
3
4
1
3
3 opt
car
2
6
8
2
3
3 opt
car
3
9
12
3
NA
car
4
12
16
4
NA
car
Apr 2001
Table 2-3: SC 4812ET FRU Configurations – Duplexed
4812
Dplxd
VH
DRDCs
2:1
4:1
Ants
LPAs
Cmbr
6 (3
NA
3
3
16
opt)
12(6–
6
NA
6
16
opt)
Table 2-4: SC 4812ET FRU Configurations – Non–Duplexed
4812
RX
TX
2:1
4:1
TRDCs
Ant
Ant
LPAs
Cmbr
3 opt
6
6
3
6 (3
3 opt
6
6
opt)
6 (3
6
3 opt
6
6
opt)
6 (3
6
3 opt
6
6
opt)
SC
4812ET RF and Power Cabinet Hardware Installation Manual
TM
BTS 2 – Expansion
4812
4812
Trnk
4812
DRDCs
2:1
4:1
Mod
DBPF
Cmbr
Cmbr
4
NA
3
3
3
4
NA
6
NA
6
BTS 2 – Expansion
4812
4812
VH
Trnk
4812
2:1
4:1
TRDCs
Mod
DBPF
Cmbr
Cmbr
Site Preparation
– continued
Expansion Field Recabling
Expansion Field Recabling
Dplxd
Ants
Add Tx cable trunking module
3
to combiner
Add Tx cable trunking module
6
to combiner. Recable Exp Tx to
add combiners
Expansion Field
RX
TX
Recabling
Ant
Ant
Add Tx cable trunking
module to
DBPF/conbiner.
Add Tx cable trunking
module to DBPF/
combiner. Recable
Starter Tx to add
combiners
Add Tx cable trunking
module to combiner.
Recable Starter Tx to
add combiners
. . . continued on next page
DRAFT
Expansion
Expansion
Impact to
Impact to
Service
Service
None
Take
dowm
Carrier 3
Tx
Expansion
Impact to
Service
None
Take down
ALL Tx
Take down
Carrier 3
Tx
39
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