Service Manual

GSM-204-423
BTS architectures and interoperability
31st Oct 01
Inst. 6–6
Installation & Configuration: Horizon macro outdoor
CONTROLLED INTRODUCTION
68P02902W03-A
GSM900
Refer to Figure 6-5. In GSM900 products, RF gain for the IADU and SURF is
configurable. A split cell configuration is therefore dealt with in the same way as
that described for DCS1800, except that the 13 dB attennuators are not
required. Instead, the required signal level is maintained by using appropriate
gain settings for the IADU and SURF.
CTU
Cell A
Cell B Cell C
Rx
div
Rx Rx Rx
div
Duplexer
IADU
*
SURF
*
Rx
div
Rx
DLNB
Rx Rx
div
TCU
Rx
Rx
div
Rx
div
Rx
* Configurable gain
Duplexer
To NIU and Abis
Interface
M-Cell 6 (Master)Horizon macro (Extender)
FMUX
MCU
FMUX
Fibre
optic
link
FOX
Figure 6-5 Functional overview of the receive path for a GSM900 split cell
configuration