Comtech EF Data SNM-1002 - Manual (Page 110)

SNM-1002 LinkSync
 Modem
Revision 2
Maintenance MN/SNM1002.OM
5–2
5.1.1 Interface Checkout
Use the following procedure and the test setup in Figure 5-1 to inspect the interface.
Figure 5-1. Fault Isolation Test Setup
1. Connect a BER test set to the appropriate modem data connector as shown in
Figure 5-1. Refer to Chapter 2 for external modem connections.
2. Set up the modem for baseband loopback operation by using the directions
provided in section A.3.3. The modem will run error free.
3. Change the modem from baseband loopback to interface loopback operation by
using the directions provided in section A.3.3. The modem will run error free.