Powerwave Technologies NEXUS FT, Инструкция по установке и обслуживанию, Страница: 13 / 51

Nexus FT Overview
044-05251 Rev B 1-3
Distribution PCBA (DIA)
The DIA is the core distribution PCBA to which all other PCBAs and units connect in the cabinet with the
exception of the PA. Figure 1-2 shows a DIA PCBA. A shielded metal frame on the DIA provides the mounting
location for the CU, ALI and RCIs, if used.
Figure 1-2 DIA PCBA
Control Unit PCBA (CU)
Figure 1-3 shows the CU, which is the core microprocessor controller in the WRH and is connected to P2 on
the DIA. The CU contains a microprocessor, main memory, flash memory for the CU software, EEPROM
memory for parameters, memory for the event log and statistics, a REFO reference oscillator, ports for local
and remote communication, a battery powered real-time clock, and a MAC identity circuit. It supervises and
controls operational parameters such as gain control and channel handling, alarms, the event log, the
password and the logon. The CU is also a control interface for OM-Online and OMS. Software for the CU can
be downloaded from OM-Online, either locally or remotely. It is located in the lower right part of the shielded DIA
frame.
Figure 1-3 CU PCBA
Low Noise Amplifier (LNA)
LNAs are used on the uplink and are located at the top of the cabinet and the high cover, if equipped. An
example of an LNA is illustrated in Figure 1-4. All of the coaxial connectors are SMA-type. Signals from the DPX
output are fed to the LNA input connector (IN). The OUT1 and OUT2 outputs feed the WBAs in the UL direction.
The signal level at these connectors is +20dB referenced to the antenna input. The other output, OUT LOW, is
an expansion output for an additional LNA if the WRH is equipped with a unit in the cover part of the chassis.
ALLGON INNOVATION
SWEDEN M105 R6
1
PARKING
FOR W5
W5
8
P27
W6B 10
1
P33
ALARM
P23
LNA
UP-LINK
P32
MODEM
A
U
X
1
P28
DOOR
5
9
6
1
1
16
1
1
M
->
S
P11
P34
8
9
15
P26
15 16
S
->
M
1 2
3
8 9
P
36
5
X0A
X0B
2
V2
1
16
P12 P13
1
1
1
16
16
16 P4
P5
P6
c
b
a
c
b
a
c
b
a c
b
a
1 P2 32
1
b
a
1 16 P3
16
1
16
P14
1
V1
1
1
1
1
1
4
6
1
15
6
9
15
2
16
1
2
4
5
8
5
P35
P21
PSU
6
10
P31
PC
P29
P24
P25
GND
7
6 V6
LNA
DOWN-LINK
LED
P22
1
2
V6B
P27
P26
P23
XOA
XOB
P28
P4 P5 P6 P2 P3 P31 P21 P35 P33
P32
P11 P12 P13 V1 P14 P22 P29 P34 V2 P36
V6
GND
P25
P24