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GSM-204-423
DCS1800
Refer to Figure 6-4. In the Horizon macro cabinet, low noise amplification in the
SURF module first boosts the Rx signal by +13 dB. Separate Rx outputs from
the SURF are then discretely routed to relevant transceivers in the master
cabinet, and to the LNA in the extender cabinet. Since the LNA boosts the Rx
signal by a further +13 dB, a 13 dB attenuator is placed in the signal path to
offset this additional signal gain, which would otherwise result in signal levels
outside the permitted range for the transceivers.
The Rx
cabinet. Separate Rx
relevant receivers in the extender cabinet, and to the SURF module in the
master cabinet. Since the SURF provides a further +13 dB boost, a 13 dB
attenuator is again placed in the signal path to offset this additional gain.
In this way, the arrangement shown in Figure 6-4 delivers Rx and Rx
to the uplink path in both cabinets, at the required signal level.
31st Oct 01
signal is similarly given a +13 dB boost by the LNA in the extender
div
outputs from the LNA are then discretely routed to
div
Cell A
Rx
Rx
div
Duplexer
SURF
+13 dB
Rx
CTU
Horizon macro (Extender)
Figure 6-4 Functional overview of the receive path for a DCS1800 split cell
Installation & Configuration: Horizon macro outdoor
68P02902W03-A
CONTROLLED INTRODUCTION
BTS architectures and interoperability
Cell B
Rx
Rx
Rx
div
–13 dB
LNA
Rx
–13 dB
Rx
Rx
div
FMUX
FMUX
Fibre
optic
link
configuration
signals
div
Cell C
Rx
Rxdiv
div
Duplexer
+13 dB
Rx
div
TCU
FOX
MCU
To NIU and Abis
Interface
M-Cell 6 (Master)
Inst. 6–5
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