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GSM-204-423
Suggested RF configurations
Overview of
configuration
diagrams
The following series of RF configuration diagrams show suggested ways of
connecting together Horizon macro SURF and Tx blocks to meet different
operational requirements. The series of diagrams is by no means exhaustive,
and numerous alternative configurations may be adopted to achieve the same
aim.
Each Horizon macro cabinet is represented by a SURF module, three Tx blocks
and an earth plate. In a standard cabinet the Tx blocks and SURF module are
supplied connected to a right side entry earth plate, (left side cable entry
requires fitting of optional earth plate kit). A blanking panel, or expansion plate
(for multiple cabinet configurations), is fitted on the opposite side of the cabinet
top section. Antenna connecting cables, not supplied as part of the
Horizon macro equipment, connect to the outside of the earth plate.
Interconnecting cables are not individually identified as different cables are
used, dependant on physical layout.
With the exception of Figure 3-33 and Figure 3-34 the diagrams are applicable
for single band operation at 850, 900, 1800 or 1900 MHz, although only the
1800 MHz SURF module is illustrated. Connections to the dual band 900 or
1800 SURF are identified in the same way as those to the single band SURF,
with the addition of two extra connectors provided for dual band use.
Figure 3-33 shows one way of achieving dual band operation using two
Horizon macro cabinets. A single band 1800 SURF is installed in one cabinet
and a dual band 900 SURF in the other. Figure 3-34 shows another, using one
of each type of dual band SURF.
Diversity is assumed in all the RF configuration diagrams shown here, except for
Figure 3-14. Other non-diversity configurations can be derived from this figure
by ensuring that the single receive path is always connected to branch A at the
SURF module.
Digital connections
Digital connections between cabinets are not shown in the following diagrams.
Fibre optic cables used to provide digital connections between cabinets are
described in Connecting fibre optic cables.
Depopulated site configurations
The purpose of a depopulated site configuration is to allow customers to provide
a future expansion capability, at the time of installation. The diagram showing
the final target configuration is to be used to connect TX blocks, SURF and
antennas. Depopulated site configurations are supplied with fully equipped RF
section to achieve the target configuration, with CTUs only fitted to alternate
slots. CTUs are fitted in slots 0, 2 and 4. Unused Tx block SMA connectors must
be fitted with 50 ohm terminating loads.
31st Oct 01
NOTE
Dual band SURFs are not available for GSM850 or
PCS1900 BTS variants.
Installation & Configuration: Horizon macro outdoor
68P02902W03-A
CONTROLLED INTRODUCTION
Suggested RF configurations
Inst. 3–37
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