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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
NOTES: Tx combiners typically not used until system exceeds 2 carriers.
Duplexed diversity Rx antennas are routed to TRDCs 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 TRDCs in the starter frame could be removed and replaced with cover plates, but it is not recommended due to the time involved.
Apr 2001
Table 2-4: SC 4812ET FRU Configurations – Non–Duplexed
4812
RX
TX
TRDCs
2:1
4:1
Ant
Ant
LPAs
Cmbr
6 (3
3 (6
NA
3
3
opt)
opt)
SC
4812ET RF and Power Cabinet Hardware Installation Manual
TM
BTS 2 – Expansion
4812
4812
VH
Trnk
4812
TRDCs
2:1
4:1
Mod
DBPF
Cmbr
Cmbr
16
4
NA
3
3
Site Preparation
Expansion Field
Expansion Field
RX
TX
Recabling
Recabling
Ant
Ant
Add Tx cable trunking
3
3
3
module to combiner
DRAFT
– continued
Expansion
Expansion
Impact to
Impact to
Service
Service
None
41
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