Service Manual

GSM-205-423
BTS architectures and interoperability
31st Oct 01
Inst. 3–12
Installation & Configuration: Horizon macro indoor
CONTROLLED INTRODUCTION
68P02902W08-B
GSM900 5/5 configuration using two cabinets
In this configuration, there are no split cells, and therefore no uplink or downlink
connections between the cabinets. In the M-Cell
6 cabinet, both 3IP CBFs are
configured with external loads provided by the NON HYB. In the Horizon
macro,
one DDF has two direct RF inputs, plus a third input via the FEEDTHRU. The
second DDF has two RF inputs, one direct and one via the FEEDTHRU. This
arrangement facilitates using the transceivers in sequence. The two 50 ohm
loads are required to terminate the unused DDF/3IP CBF input ports.
ÇÇÇ
ÇÇÇ
ÇÇÇ
2B 1B 0B 2A 1A 0A B A
DDF2 DDF1FEEDTHRU
3IP CBF2 NON-HYB 3IP CBF1
EXT
50 ohm loads
Sector 1Sector 2
Horizon macro
M-Cell 6
Figure 3-10 GSM900 mixed Horizon macro / M-Cell 6 5/5 configuration using
two cabinets