Forward Path; Figure 2-6 Signal Flow Diagram - Motorola Starline SG 2000 Installation And Operation Manual

Refer to the current Motorola catalog for option and feature availability.
F o r w a r d P a t h
The multiple receiver functionality of the platform accommodates split-band and/or redundancy
applications. A typical split-band configuration has analog signals in the 52 MHz through 550 MHz
band feeding one receiver (C location in Figure 2-6). Digital transmissions or narrowcast signals are
carried between 450/550 MHz and 870 MHz on another fiber and processed by the second receiver
(A location). You can use the optional third receiver (B location) as a back up in the event that the
narrowcast receiver loses optical signal input. Automatic path switchover occurs through either the
optional status monitoring or manual control-board modules.
Figure 2-6 provides a diagram of the signal flow-path through the SG 2000:
F i g u r e 2- 6
Si gn al flow d ia gra m
SG2 lid
SG2-ABJ/P
forward
A/B
jumper
TP
Receiver C JXP
TP
Receiver B JXP
TP
Receiver A JXP
Power supply
Data lines
Power supply
-1.0
Optical transmitter
JXP
TP
Optical transmitter JXP
* *
TP
All forward and return path test points (TP) are -20dB
* 5dB
* * With second transmitter pad = 5dB; without second transmitter pad = 15dB
SG2 RF chassis
SG2-FBS
forward
JXP
band
split
HP
filter
-1.5
JXP
+15 Lo
+21.5 Hi
SG2-FJB/P
forward
Switch
jumper
board
+24 VDC
+5 VDC
ACV
Status monitor
SG2-RPM/C
-3.5
-2.0
LP filter
*
SG2-RPLPF
SG2-RPM/S
LP filter
LP filter
SG2-RPLPF
ADU POT
-2.0 -1.5 Splitter
SG2-FRB Attenuator MDR
-2.0 + 18.5
@ Min atten Amplifier
Ingress control
+8.5 -3.5
-0.5
-3.5
-3.5
-2.0
S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
O v e r v i e w 2 - 7
JXP
-8.0
Amplifier
-1.0
Splitter
JXP EQ
+18.5
-1.0
-0.5
Ingress
JXP
Splitter -2.0
TP
Amplifier
JXP EQ
Ingress JXP
TP
Amplifier
JXP EQ
Ingress
JXP
TP
Amplifier
JXP EQ
Ingress
JXP
TP
-1.0
Diplex
filter
TP
H
L
-0.5
-0.5
Diplex
filter
TP
H
L
Diplex
filter
TP
H
L
Diplex
filter
TP
H
L