3.4 Fault Management

Fault management is conceptually partitioned into two levels: the system top level, and interface-specific level. Both levels are alarm-level configurable and can be Major and Minor. All the alarms are mask-able.

Fault management provides the alarm output through hardware output interface (on the system front panel) and visible indicator (LED). The alarm/status indications are automatically generated as a result of certain events/conditions. The IDL-2402 supports query of all current alarm status. It is also able to keep 256 records of historical alarms and events respectively.

The IDL-2402 provides the ability to group alarms in a hierarchical alarm presentation scheme. Alarms of the same rank can exist at the same time. A lower-ranking alarm will be demoted if a higher-ranking alarm is raised for the same object. For example, if a far-end LOS is raised on a circuit and then a far-end LPR is raised on the circuit, the LPR alarm stands and the LOS closes. The alarm hierarchy used in the IDL-2402 system is shown in the following table:

 

Table 3-3 IDL-2402 Alarm Hierarchy

 

 

Priority

Alarm Type

Highest

all activation failures (ADSL_COMMF_FE or

 

ADSL_NOPEER_FE)

—far-end LPR

—near-end LOS or far-end LOS

Lowest

near-end LOF or far-end LOF (near-end and far-end are

 

independent; for example, FE-LOS does not restrain NE-LOF)

Note: 1.LOM, LCD, and NCD are not included in the alarm hierarchy; they’re treated independently.

2.The PM counters LPR, LOS, and LOF follow the alarm hierarchy rule. When these alarms exist at the same time, only the PM counter of a higher-ranking alarm will count (the PM counters of other lower-ranking alarms will not).

System Alarms

The IDL-2402 provides the following System alarms:

„Fan Failure Alarm

„Above Temperature

„Below Temperature

„Self-test Fail

„DSP Fail - you can see which DSP chip is fail from the user interface (Web GUI, CLI, etc.). There is a number 1 ~ 4 in the alarm message/description corresponding to the DSP chip 1 ~ chip 4

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