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GSM-204-423
Transmit path
M-Cell 6 combining
When configuring the downlink paths for a cell using three carriers or more, it
may be necessary to provide additional external RF load(s) for the combiners.
This is illustrated by Figure 6-6, which shows a typical M-Cell 6 combining
arrangement for a 4-carrier cell.
Carriers 1 and 2 are combined in a hybrid combiner (HCOMB) module. The
output from this module provides one of the three inputs to the 3IP CBF. The
HCOMB is equipped with an internal RF load, and is therefore self–contained.
The 3IP CBF requires one RF load for each of the two hybrids it contains, but is
equipped with only a single internal RF load. An additional load is therefore
provided for this purpose on the HCOMB casing.
31st Oct 01
External
load
HCOMB
Load
Hybrid
Carrier 1
Carrier 2
One carrier from each of four transceivers
Figure 6-6 Typical M-Cell 6 arrangement for combining four carriers
Installation & Configuration: Horizon macro outdoor
68P02902W03-A
CONTROLLED INTRODUCTION
BTS architectures and interoperability
Duplexer
3IP CBF
Hybrid
Load
Hybrid
Carrier 3 Carrier 4
Inst. 6–7
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