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Maintenance
NOISE
GENERATOR
VAR ATTEN
1. Ensure the interface is configured for the proper mode of operation. Refer to
2. Connect a BER test set to the appropriate modem data connector as shown in
3. Set up the modem for baseband loopback operation by using the Configuration
4. Change the modem from baseband loopback to interface loopback operation by
6–2
Figure 6-1. Fault Isolation Test Setup
Chapter 3 for configuration jumper settings.
Figure 6-1. Refer to Chapter 2 for the following data connections:
a. MIL-STD-188
b. G.703
c. ECL
d. PECL
Interface front panel menu (refer to Chapter 4). The test set should run error free.
Refer to Figure 4-19 for a block diagram of the baseband loopback operation.
using the Configuration Interface front panel menu (refer to Chapter 4). The test
set should run error free. Refer to Chapter 4 for a block diagram of the interface
loopback operation.
VAR ATTEN
SPECTRUM
ANALYZER
SDM-9000 Satellite Modem
TX IF
MODEM
UNDER
RX IF
TEST
DATA
CONNECTORS
BER
TEST SET
Rev. 4
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