Comtech EF Data C5 - Manual (Page 226)

System Checkout C5/K1/K3 Integrated Satellite Terminal System
Rev. 0 6-2
6.2 Interface Checkout
Use the following procedures and test setup in Figure 6-1 to inspect the interface.
SPECTRUM
ANALYZER
DATA
CONNECTORS
TX
RX
DC
BLOCK
DC
BLOCK
MIXER
VAR ATTEN
VAR ATTEN
CW FREQ=TX+RX FREQUENCIES
NOISE
GENERATOR
BER
TEST SET
MODEM UNDER
TEST
CW SIGNAL
GENERATOR
Figure 6-1. Fault Isolation Test Setup
1. Connect a BER test setup to the appropriate IDU data connector as shown in
Figure 6-1. Refer to Chapter 3 for External IDU Connections.
2. Set up the IDU for baseband loopback operation by using the Configuration
Interface front panel menu (Chapter 4). The IDU will run error free. Refer to
Chapter 3 for a block diagram of the baseband loopback operation.
3. Perform only if Overhead Interface is installed: Change the IDU from baseband
loopback to interface loopback operation by using the Configuration Interface
front panel menu (Chapter 4). The IDU will run error free. Refer to Chapter 4 for
a block diagram of the interface loopback operation.