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SDM-300L3 Satellite Modem
Introduction
Refer to Figure 1-1 for a system block diagram.
AC Or
(Optional)
Optional
Breakout Panel
DC
UB-530
Prime
Power
User
Data
AUX 1
OC-TTL
Faults
Form C
Contacts
Remote
Port
Notes:
1. The UB-530 universal breakout panel (BOP) is an option for V.35, G703, EIA-232, and
EIA-422.
2. When the modem is equipped with a 50-pin data I/O connector, the use of the BOP is
required to interface the customer data connector to the modem.
3. Contact Comtech EF Data for information concerning universal breakout panels.
Power
AC Only
Power
Supply
Supply
Tx Data
Tx Clock
Data
ST Clock
Data
J8
Interface
Interface
Rx Data
Rx Clock
AUX 1
Sat Clock
J9
AUX 1
AUX 1
Fault Relays
J7
Control / Status
J10
Alarm Relays
M&C
M&C
J6
Remote Port
Figure 1-1. Block Diagram
Opt ODU
Opt ODU
Ref Osc
Ref Osc
Supply
Supply
Ext Ref
Encoder /
Encoder /
Modulator
Modulator
Tx IF
Note 1
Demodulator
Rx IF
Demodulator
I/Q
/ Decoder
/ Decoder
Note 2
AGC
SDM-300L Satellite Modem
1–2
MN/SDM300L3.IOM
CP2
CP1
Transmit
Transmit
RF Equipment
RF Equipment
CP3
LNB
LNB
Notes:
1) Tx IF (L-Band only) Outputs a 10 MHz
Reference and Optional ODU Voltage.
2) Rx IF Outputs LNB Voltage and 10 MHz
Reference.
Revision 1
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