
Site Preparation
– continued
Apr 2001
39
SC
TM
4812ET RF and Power Cabinet Hardware Installation Manual
DRAFT
Table 2-3: SC 4812ET FRU Configurations – Duplexed
Con–
fig
Expansion
Impact to
Service
Expansion Field Recabling
BTS 2 – Expansion
BTS 1 – Starter
Ttl #
Sec
Car
Con–
fig
Expansion
Impact to
Service
Expansion Field Recabling
Dplxd
Ants
DRDCs
4812
4:1
Cmbr
4812
2:1
Cmbr
4812
DBPF
Trnk
Mod
VH
LPAs
Dplxd
Ants
DRDCs
4812
4:1
Cmbr
4812
2:1
Cmbr
4812
DBPF
Trnk
Mod
VH
LPAs
Ttl #
Sec
Car
8
car
None
Add Tx cable trunking module
to combiner
3
3
3
3
NA
4
16
3
6 (3
opt)
3
NA
NA
4
16
24
4
car
24
16
4
NA
6
NA
12(6–
opt)
6
16
4
NA
6
NA
6
6
Add Tx cable trunking module
to combiner. Recable Exp Tx to
add combiners
Take
dowm
Carrier 3
Tx
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.
Table 2-4: SC 4812ET FRU Configurations – Non–Duplexed
BTS 1 – Starter
BTS 2 – Expansion
Con–
fig
Ttl #
Sec
Car
VH
LPAs
Trnk
Mod
4812
DBPF
4812
2:1
Cmbr
4812
4:1
Cmbr
TRDCs
RX
Ant
TX
Ant
VH
LPAs
Trnk
Mod
4812
DBPF
4812
2:1
Cmbr
4812
4:1
Cmbr
TRDCs
RX
Ant
TX
Ant
Expansion Field
Recabling
Expansion
Impact to
Service
3 Sector
1
car
3
4
1
3
3 opt
3 opt
6
6
3
2
car
6
8
2
3
3 opt
3 opt
6
6
6 (3
opt)
Add Tx cable trunking
module to
DBPF/conbiner.
None
3
car
9
12
3
NA
6
3 opt
6
6
6 (3
opt)
Add Tx cable trunking
module to DBPF/
combiner. Recable
Starter Tx to add
combiners
Take down
ALL Tx
4
car
12
16
4
NA
6
3 opt
6
6
6 (3
opt)
Add Tx cable trunking
module to combiner.
Recable Starter Tx to
add combiners
Take down
Carrier 3
Tx
. . . continued on next page