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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

Table 3: Common Fault Hierarchy - OTN and CBR Ports

Alarms/Conditions

Fault Hierarchy

Equipment fault hierarchy

LOS

LPBK

PRBS

LaserTempHighTh

LaserTempLowTh

LaserFail

ModTempShutdown

OptHighTh

OprLowTh

Lolck

LOF

PreFecBerTh

TransmitterDegrade

Protocol Faults:

OptHighTh

OptLowTh

ModTempHighTh

ModTempLowTh

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

Table 12: DOL OCH Fault Hierarchy

Alarms/Conditions

Fault Hierarchy

Equipment fault hierarchy

OchOci

OchUeq

PosTxHigh

LoLightTx

DOL OMS fault hierarchy

PosTxLow

PosRxHigh

OchAis

LoLightRx

PosRxLow

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