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    Fault Masking and Hierarchies

    Fault masking occurs when a service-affecting alarm or condition raised against a monitored entity suppresses the reporting of other alarms or conditions that are raised against the same entity. A fault that masks another fault is in a higher position in the fault hierarchy for a monitored entity and indicates either a higher priority fault or a fault that more accurately identifies the source of a problem. This means that when a fault that masks other faults is cleared, each masked fault will be reported if it was not cleared by the resolution of the masking fault.

    The following sections list faults common to specific monitored entities and include fault-hierarchy flow charts that illustrate the masking relationships among those faults.

    Equipment Fault Hierarchy

    Table 1: Equipment Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    EqptMiss

    EqptMism

    EqptComm

    EqptFail

    EqptDgrd

    Environment Fault Hierarchy

    Table 2: Environment Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    EnvCurrentHighTh

    EnvCurrentLowTh

    EnvTempHighTh

    EnvTempLowTh

    EnvVoltHighTh

    EnvVoltLowTh

    Common Fault Hierarchy - OTN and CBR Ports

    OTN Interface Fault Hierarchy

    Note: In the OTN fault hierarchy, a service-affecting fault raised against an OTN OTU interface will mask all faults raised against each OTU ODU interface it contains.

    Table 4: OTN Interface Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    LOS

    LOF

    SD

    LOM

    BDI

    TIM

    ODU-AIS

    LCK

    OCI

    OduMism

    OdtgMism

    PyldMism

    Ethernet Interface Fault Hierarchy

    Table 5: Ethernet Interface Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    LOS

    LoSync

    HighBer

    LF

    RF

    OC192, WAN PHY Over OC192 Interface Fault Hierarchy

    Table 6: OC192, WAN PHY Over OC192 Interface Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    LOS

    LOF

    SD

    TIM

    AIS–L

    RDI-L

    STM64, WAN PHY Over STM64 Interface Fault Hierarchy

    Table 7: STM64, WAN PHY Over STM64 Interface Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    LOS

    LOF

    SD

    TIM

    MS-AIS

    MS-RDI

    Fibre Channel Interface Fault Hierarchy

    Table 8: Fibre Channel Interface Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    LOS

    LoSync

    HighBer

     
     

    DOL Port Fault Hierarchy

    Table 9: DOL Port Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    APSD

    FECI

    FEIM

    LoSpecRx

    APR

    LoLightRx

    DOL OSC Fault Hierarchy

    Table 10: DOL OSC Fault Hierarchy

    Alarms/Condition

    Fault Hierarchy

    Equipment fault hierarchy

    ContComS

    LoLightRx

    ObrHt

    DOL OMS Fault Hierarchy

    Table 11: DOL OMS Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    OmsAis

    LoLightRx

    PosRxLow

    DOL OCH Fault Hierarchy

    Terminal Amplifier Port Fault Hierarchy

    Table 13: Terminal Amplifier Port Fault Hierarchy

    Alarms/Conditions

    Fault Hierarchy

    Equipment fault hierarchy

    APSD

    ContComS

    FECI

    FEIM

    ObrHt

    TlossRxHt

    TlossRxLt

    APR

    LoLightRx

    Modified: 2017-10-24