Comtech EF Data SNM-1000 - Manual (Page 136)

SNM-1000 Node Control Modem Revision 3
Maintenance MN/SNM1000.IOM
5–6
5.1.2 Faults/Alarms Display
General fault, status, and alarm information are indicated by 8 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 red 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 Fault or Stored Fault front panel menu. Refer to Chapter 3 for
information on the Fault or Stored Fault front panel menu.
Alarms are considered minor faults which will not switch the modem offline in a
redundant system. Alarms are shown in the Fault or Stored Fault front panel menu by a
reversed contrast (white on black) character that appears at the display panel.
5.1.3 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