Motorola SG 2000 用户手册
O p e r a t i o n
5 - 5
SG 20 00 Ins tal la tion and O pera tion M anua l
A na log Re tu rn P a th RF Con figu ra tio n
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).
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.
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.
F i g u r e 5 - 7
R e d u n d a n t r e t u r n
R e d u n d a n t r e t u r n
SG2-RPM/C
SG2-RPLPF
Optional
transmitter
A
Optional
transmitter
B
TP
TP
Bulkhead connector
for dc power
for dc power
JXP
JXP
BASE
Status
monitor
JXP
Ingress
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:
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:
F i g u r e 5 - 8
S p l i t r e t u r n
S p l i t r e t u r n
SG2-RPM/S
SG2-RPLPF
Optional
transmitter
A
Optional
transmitter
B
TP
TP
JXP
JXP
BASE
LID
Status
monitor
JXP
Ingress
TP
TP
H
L
LP filter
LP filter