Troubleshooting guide

MX2820 System Manual
8-4 61186003L1-1D
Observe the Alarm LED Status on the SCU
Using Table 8-1, determine the type of alarm generated by the SCU.
• A flashing red ALM LED indicates a critical alarm is in progress.
• A solid red ALM LED indicates either a major or minor alarm is in progress.
Observe the Alarm LED Status on the MUX Module
Using Table 8-2, determine the type of alarm generated by the MUX Module by observing the
ALM, DS3/NET STAT, and DS1 STAT LEDs on the MUX module front panel.
NOTE
In Table 8-2, DS3 refers to the M13 MUX, and NET refers to the
STS-1 MUX.
• Flashing red ALM and DS3/NET STAT LEDs indicate a DS3 critical alarm is in progress.
• Solid red ALM and DS3/NET STAT LEDs indicate a major or minor DS3 alarm is in progress.
• Flashing red ALM and DS1 STAT LEDs indicate a DS1 critical, but non-critical system alarm,
is in progress.
• Solid red ALM and DS1 STAT LEDs indicate a major or minor DS1 alarm is in progress.
Table 8-1. MX2820 SCU LED Descriptions
LED State Description
ACT
Solid Green
Alternating Green/Amber
Solid Red
Solid Amber
Alternating Red/Amber
Flashing Red
Everything is OK and operating normally
Everything is OK and console is open
Self-test failed
Software update is in progress
Self-test failed and console is open
SCU Module has failed
ALM
Solid Green
Flashing Red
Solid Red
Flashing Amber
Solid Amber
No critical, major, or minor alarms in progress
Critical alarm in progress
Major or minor alarm in progress
Critical alarm was highest priority alarm suppressed by ACO
Major or minor alarm was highest priority alarm suppressed by
ACO