Product Description

Product Description
54 (98) © Nokia Corporation Draft DN991444
Nokia Proprietary and Confidential Issue 3-0 en Draft
Figure 18. Block diagram of a Nokia MetroSite TRX
One of the TRXs is configured as the master TRX, which manages all the O&M
functions of the BTS. In order to optimise the transmitter output power, the
antennas are directly connected to the TRXs.
The nominal transmitter output power at the antenna connector is 5 W (37 dBm
in GMSK, 35 dBm in 8-PSK). The single branch receiver sensitivity is better than
-106.0 dBm for the TCH/FS channel type.
6.3.1 Baseband module
The baseband (BB) module carries out baseband digital signal processing of
speech and data channels and manages all signalling for speech connections. It
also handles software downloading and timing functions of the GSM/EDGE
system.
The block diagram of the baseband module is shown in Figure 19.
RF MODULEBB MODULE
ETXA
TX LO1
IF2 RF
TX FHS
DUPLEX
FILTER
MODULE
MRX
RF
RX
FHS
RX
LO2
MRX
IF2
MRX
IF1
LNA
TRX
LOOP
IF1
ERECVA
REF
OSC
DRX
IF2
DRX
IF1
DRX
RF
ERXA
Fbus
D1E
6.5 M REF
DL
TSCLK
NRX
DRX
RF CONTROL
REF CLOCKS
RF ALARMS
DIV IN
DIV OUT
INTERFACE
TRANSMITTER
RECEIVER
ANT
2
D2
EQDSP
EFBIA
SRAM
CHDSP
EDIBA
UC
DRAM
FLASH
EMUCA
UL
I C
2
CLOCKS
I C
LMB
Q1
DN98916275