Comtech EF Data DMD-2050E - Manual (Page 164)

DMD2050E Univeral Satellite Modem Maintenance and Troubleshooting
MN-DMD2050E Revision 2 6–2
6.2 Troubleshooting
6.2.1 Basic Troubleshooting Procedures
1) Make sure all interface signals are correct.
2) If the unit is not operating correctly, replace it with an equivalent unit that is known to operate
correctly.
3) If replacing the unit does not correct the problem, examine the power supply and electrical
wiring for problems.
6.2.2 Troubleshooting Symptoms and Causes
6.2.2.1 Symptom: The modem does not acquire the incoming carrier.
Causes:
• There is an incorrect receive input to modem.
• The receive carrier level is too low.
• The receive carrier frequency is outside of the acquisition range.
• The transmit carrier is incompatible.
• The modem is in test mode.
6.2.2.2 Symptom: The ASYNC port is not configured correctly.
Causes:
• The switches are set incorrectly.