SC
TM
4812T-MC vs SC 4812T BTS Read Me First (Comparison)
68P64115A21–B
Sept 2003
1X SC 4812T-MC Multicarrier BTS Optimization/ATP
RMF-1
Read Me First
SC
TM
4812T-MC vs SC 4812T BTS Read Me First (Comparison)
This
Read-me-first
document describes a summary of changes between
the existing SC 4812T BTS and the SC 4812T-MC (Multicarrier) BTS.
The SC 4812T-MC is based on the existing SC 4812T platform and
employs similar hardware and architecture. The differences between
these products are briefly described and illustrated below. This section is
not intended to replace the SC 4812T-MC manual set. This information
applies generally to both +27V and –48V frames, although only +27V
illustrations are shown.
Multicarrier provides the capability for all PAs in all quadrants to
provide trunked power across all sector/carriers. This differs from the
previous architecture in which PA modules within a quadrant provided
trunked power to only one carrier. Furthermore, in SC 4812T-MC,
adjacent channels can be combined onto one antenna versus being
transmitted on separate antennas in SC 4812T.
An overview of the BTS differences is illustrated in the following table
and in illustrations on the following pages (Figure 1 thru Figure 4).
SC 4812T
Description
#
Description
SC 4812T-MC
1
2
3x3 DC Power Input
1
2x2 DC Power Input
1
2
7
1
2
3
I/O Plate supporting
3x3 DC Power Input
2
I/O Plate supporting
2x2 DC Power Input
1
2
3
7
CCCP Fan Tray
3
CCCP Speed
Controlled Fan Tray
4
C-CCP Cage:
S
CIO (3- or
6-Sector)
S
BBX-1X
S
Switch
4
C-CCP Cage:
S
MCIO (3- or 6-Sector)
S
High Power BBX-1X
S
High Power Switch
4
6
5
PA Shelves:
S
SC 4812T LPA
S
4x4 TX Backplane
S
PA Location and
Mapping (see
S
Shelf Qty: 1 for up
to 2 carriers; 2 for 3 or
more carriers.
5
PA Shelves:
S
SC 4812T CLPA
S
Multicarrier module
S
(Switched) Parallel
Linear amplifier Combiner
S
Enhanced Trunking
Module
S
LPA/PLC Filler Panel
S
PA Location and
S
Shelf Qty: 2 for all
configurations
5
6
7
2:1 or 4:1 Combiners
or Dual Bandpass TX
Filters
6
TX Filters
and/or
TX Output Terminator
ti-CDMA-WP-00098-v01-ildoc-ftw
PA Breaker Mapping
7
PA Breaker Mapping
ti-CDMA-WP-00196-v01-ildoc-ftw