ADTRAN TRACER 2xT1, Руководство пользователя, Страница: 20 / 65

TRACER 2xT1 User’s Manual
61280003L2-1B
Section 1 TRACER Description
9 Preliminary
Three SMA connectors, located on the RFC module, provide RF and IF connection points. A test point is
provided for monitoring the received signal strength indicator (RSSI). The voltage (relative to the GND
test point) present on this test point represents the level of the received signal. This signal is used to align
the antenna when installing the system and to verify the link is performing as designed. Another test
point is provided to monitor the transmitter output power during system configuration. The only
connections that must be made in the field are a coax connection between the baseband processor and the
RFC and a coax connection between the RFC and the antenna. These connections require male, type N
coax connectors.
The IF connector provides the connection between the baseband processor and the rackmounted or
mastmounted RFC. (An 8-inch IF cable [ADTRAN part # 3125RF027@A] is provided for rackmount
systems). The
TO ANTENNA connection provides the connection between the RFC and the antenna. A
block diagram of the RFC functions is show in Figure 1-9 .
The RFC module is enclosed in either a 19-inch EIA rackmount housing, or a weather-tight enclosure
suitable for mastmounting near the antenna for enhanced system performance. The RFC mastmount and
rackmount housings are illustrated in
Figures 1-10 and 1-11 .
Figure 1-8. RFC Module
R X
TX
IF
RSSI
GND TX-PWR
Figure 1-9. RFC Function Block Diagram
SAW
3 3 3
2 3 2 1
2 2 8 1
AGC
Splitter
Splitter
AGC
PA
LPF
RF2
IF
2 0 1 8 5 3 4 4
o r
2 0 5 8 5 4 2 4
5 6 0 7
o r
5 6 8 7
Tx
R x