Motorola Starline SG 2000 - Return Path RF Configuration

Operation 5-5
SG 2000 Installation and Operation Manual
Analog Return Path RF Configuration
If you are using a single optical transmitter, it must be installed in the optical transmitter A position
as illustrated in Figure 3-1. A JXP-15A (15 dB) pad must also be installed in the pad facility at the B
transmitter location to terminate the signal from the return-path-module combiner board
(SG2-RPM/C).
For single return applications, the SG2-LIDB distributes an individual RF signal from the RF chassis
to transmitter A. Installing an optional second transmitter (B) provides return redundancy as
illustrated in Figure 5-7. Installing a redundant B transmitter also requires that you change the pad at
that location to a JXP-5A.
Figure 5-7
Redundant return
SG2-RPM/C
SG2-RPLPF
Optional
transmitter
A
Optional
transmitter
B
TP
TP
Bulkhead connector
for dc power
JXP
JXP
BASE
Status
monitor
JXP
In
g
ress
LID
TP
TP
H
L
LP filter
Alternatively, a second transmitter can be used to double the available return bandwidth by having
each transmitter carry the return signals from only two ports. This is illustrated in Figure 5-8. It
requires that the SG2-RPM/C (located on the bottom side of the RF chassis) be changed to a
return-path-module split board (SG2-RPM/S) as illustrated in Figure 5-9:
Figure 5-8
Split return
SG2-RPM/S
SG2-RPLPF
Optional
transmitter
A
Optional
transmitter
B
TP
TP
JXP
JXP
BASE
LID
Status
monitor
JXP
In
g
ress
TP
TP
H
L
LP filter
LP filter