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
- Environment Fault Hierarchy
- Common Fault Hierarchy - OTN and CBR Ports
- OTN Interface Fault Hierarchy
- Ethernet Interface Fault Hierarchy
- OC192, WAN PHY Over OC192 Interface Fault Hierarchy
- STM64, WAN PHY Over STM64 Interface Fault Hierarchy
- DOL Port Fault Hierarchy
- DOL OSC Fault Hierarchy
- DOL OMS Fault Hierarchy
- DOL OCH Fault Hierarchy
- Terminal Amplifier Port Fault Hierarchy
Equipment Fault Hierarchy
Table 1: Equipment Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
Environment Fault Hierarchy
Table 2: Environment Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
Common Fault Hierarchy - OTN and CBR Ports
Table 3: Common Fault Hierarchy - OTN and CBR Ports
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
Protocol Faults: | |
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 |
|---|---|
| |
Ethernet Interface Fault Hierarchy
Table 5: Ethernet Interface Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
OC192, WAN PHY Over OC192 Interface Fault Hierarchy
Table 6: OC192, WAN PHY Over OC192 Interface Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
STM64, WAN PHY Over STM64 Interface Fault Hierarchy
Table 7: STM64, WAN PHY Over STM64 Interface Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
DOL Port Fault Hierarchy
Table 8: DOL Port Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
DOL OSC Fault Hierarchy
Table 9: DOL OSC Fault Hierarchy
Alarms/Condition | Fault Hierarchy |
|---|---|
| |
DOL OMS Fault Hierarchy
Table 10: DOL OMS Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
DOL OCH Fault Hierarchy
Table 11: DOL OCH Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
Terminal Amplifier Port Fault Hierarchy
Table 12: Terminal Amplifier Port Fault Hierarchy
Alarms/Conditions | Fault Hierarchy |
|---|---|
| |
