Verilink HDM 2180 (880-503048-001) Product Manual - Manual (Page 71)

Troubleshooting
Verilink HDM 2180 User Manual 6-3
• If you have a Powerup Self-test Fail, reseat the module to see if
it will power up and pass the self test. If it does not pass after
repeated self tests, replace the module.
Alarm Records Every alarm record that appears on your screen is “active” in the
database until you do something about it. You can do the following
with the alarm records:
• Deactivating alarm records is a database management
function. As long as an alarm is active, you can view it on
screen, using one of the management options on the Craft
interface or Node Manager. When you deactivate an alarm, it’s
still in the database, but not viewable on screen. Deactivated
alarms can be subsequently archived, printed, or deleted.
• Archiving an alarm record stores it to a disk file you specify.
• Printing an alarm record prints a copy of all active and
deactivated alarms.
• Deleting an alarm record removes it from the database. To
delete an alarm, you must first deactivate it.
Interpreting Alarms
Fault conditions can result in critical, major, or minor alarms. In
addition, a fault condition can also result in a Carrier Failure Alarm
(CFA).
Critical Alarms A critical alarm indicates that the node or components of the node
have failed. The following alarms are classified as critical:
• Alarm Indication Signal Second (AISS)—A second when the
CSU receives an unframed all-ones Alarm Indication Signal
(AIS) from the network.
• Loss of Frame Second (LOFS)—A LOFS is the total number of
seconds that the CSU was in the Loss of Frame (LOF) state.
• Loss of Signal Second (LOSS)—A LOSS is a second during
which the CSU is in a Loss of Signal (LOS) state.
• Severely Errored Framing Second (SEFS)—The second in
which two or more framing bit errors occur within a 3-
millisecond period.
Major Alarms A major alarm indicates a condition where performance is seriously
affected, for example, a T3 line failure. It prevents data from being
reliably transmitted across the circuit. When a major alarm is