User Manual
Read Me First: SCE4812T–MC to SCE4812T Comparison
5/21/04 1X SC4812T–MC BTS Optimization/ATP 1-1
DRAFT
Physical Differences
This Read-me-first document describes a summary of changes between
the existing SC4812T 800MHz BTS and the SC4812T-MC
(Multicarrier) BTS. The SC4812T-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 SC4812T-MC manual
set. This information applies generally to both 800 MHz +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 SC4812T-MC,
adjacent channels can be combined onto one antenna versus being
transmitted on separate antennas in SC4812T.
An overview of the BTS differences is illustrated in the following table
and in illustrations on the following pages (Figure 1-1 thru Figure 1-4).
SC4812T
Description # Description SC4812T-MC
1
2
3x3 DC Power Input
(see Figure 1-1)
1
2x2 DC Power Input
(see Figure 1-1)
1
2
7
1
2
3
I/O Plate supporting
3x3 DC Power Input
(see Figure 1-2)
2
I/O Plate supporting
2x2 DC Power Input
(see Figure 1-2)
1
2
3
7
C–CCP Fan Tray
3
C–CCP 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
Figure 1-3)
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 Mapping
(see Figure 1-3)
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
(see Figure 1-4)
7
PA Breaker Mapping
(see Figure 1-4)
ti-CDMA-WP-00196-v01-ildoc-ftw