User's Manual

Frame Module Location & Identification – continued
May 2000
1-25
SC 4812T CDMA BTS Optimization/ATP
Figure 1-12: –48 V SC 4812T LPA Configuration – 4 Carrier, 3–Sector with 2:1 Combiners
LPA1A
LPA1B
Note
No adjacent carriers may exist within the same TX filter
combiner. “Adjacent” is defined as f
c1
and f
c2
being
1.25 MHz apart (center–to–center). “Non–adjacent” is
defined as f
c1
and f
c2
being >2.50 MHz apart
(center–to–center).
4–CARRIER CONFIGURATION
CARRIER CARRIER
LPA1C
LPA1D
LPA3C
LPA3D
LPA2A
LPA2B
LPA2C
LPA2D
LPA4C
LPA4D
FW00481
1
2
3
4
5
6
1
2
3 4
1
2
3
4
5
6
LPA3A
LPA3B
LPA4A
LPA4B
FAN
MODULE
(TYPICAL)
FILTERS /
COMBINERS
(2 TO 1 COMBINER
SHOWN)
–48 Volt
SC 4812T
Sector Configuration
There are a number of ways to configure the BTS frame. Table 1-1
outlines the basic requirements. When carrier capacity is greater than
two, a 2:1 or 4:1 cavity combiner must be used. For one or two carriers,
bandpass filters or cavity combiners may be used, depending on
sectorization and channel sequencing.
1