Comtech EF Data SNM-1002 - Manual (Page 120)

SNM-1002 LinkSync
 Modem
Revision 2
Maintenance MN/SNM1002.OM
5–12
5.2.2 Faults/Alarms Display
General fault, status, and alarm information are indicated by 10 LEDs located on the
modem’s front panel.
A fault (red LED) indicates a fault that currently exists in the modem.
When a fault occurs, it is stored in the stored fault memory, and indicated by the single
yellow LED.
The LED is turned off when the fault clears. If the fault clears, the occurrence is also
stored.
A total of 10 occurrences of any fault can be stored. Each fault or stored fault indicated
by a front panel LED could be one of many faults. To determine which fault has
occurred, use the directions in Appendix A.
Alarms are considered minor faults which will not switch the modem offline in a
redundant system. Alarms are shown by following the direction in section A.4.
5.2.3 Faults/Alarms Analysis
This section describes the possible problems and actions to take for the following faults:
• Modulator
• Demodulator
• Transmit
interface
• Receive
interface
• Common equipment
• Backward
alarm