Motorola Horizonmacro outdoor, Руководство по установке и настройке, Страница: 166 / 212

GSM-204-423 BTS architectures and interoperability
31st Oct 01
Inst. 6–4
Installation & Configuration: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W03-A
Technical
issues
When mixing different BTS types, the interface may be required to resolve
some or all of the following issues, depending on the site configuration:
The interface must deliver both Rx and Rx
div
(receive diversity) signals to
each transceiver.
The interface must not change the uplink (receive) signal level delivered to
any transceiver.
The interface must ensure that in the mixed BTS configuration, RF
combiners remain correctly loaded.
Receive path
When a cell is wholly configured within one cabinet, there is no requirement to
connect the uplink or downlink RF signals between the master and extender
cabinets. The only interface between the cabinets in this type of mixed BTS
configuration is therefore at digital level, between FMUXs via the fibre optic link.
When a cell is split between two cabinets, the uplink signals must be connected
between the cabinets since both Rx and Rx
div
signals are required at each
transceiver. In this situation the downlink signal may or may not require
connection between cabinets, depending on the site configuration. The uplink
connectivity requirements are shown in Figure 6-4 (DCS1800) and Figure 6-5
(GSM900).