Statement introduced in Junos OS Release 13.2 for PTX Series routers.
Statement introduced in Junos OS Release 15.1F6 for MPC5E, MIC6-100G-CFP2 on MPC6E on MX240, MX480, MX960, MX2010, and MX2020 routers.
Specify the interval for which the BER must stay above the signal degradation threshold—as configured in the ber-threshold-signal-degrade value statement—for the alarm to raised. After an alarm is raised, if the BER returns below the clear threshold—as configured in the ber-threshold-clear value statement—for the specified interval, the alarm is cleared.
Configuring a high BER threshold for signal degradation and a long interval might cause the internal counter register to be saturated. Such a configuration is ignored by the router, and the default values are used instead. A system log message is logged for this error.
If you configure the BER thresholds at the [edit interfaces interface-name otn-options signal-degrade] hierarchy level, then the thresholds are calculated using the pre-forward error correction (pre-FEC) BER (the BER before FEC correction). These thresholds are used for pre-FEC BER monitoring. See Understanding Pre-FEC BER Monitoring and BER Thresholds for more information about pre-FEC BER monitoring and determining BER threshold settings.
If you configure the BER thresholds at the [edit interfaces interface-name otn-options odu-signal-degrade] hierarchy level, then the thresholds are calculated using the post-FEC BER (the BER after FEC correction). This BER is referred to as the optical channel data unit (ODU) BER.
value—Time interval in milliseconds.
For the P1-PTX-2-100G-WDM PIC, the BER must stay above the signal degradation threshold for ten consecutive intervals for the alarm to be raised and the BER must stay below the clear threshold for ten consecutive intervals for the alarm to be cleared. For example, if the interval is configured as 10 ms, then the BER must stay above the signal degradation threshold for 100 ms (10 ms * 10 intervals) for the alarm to be raised, or below the clear threshold for 100 ms for the alarm to be cleared.
For P1-PTX-24-10G-W-SFPP PIC and P2-100GE-OTN PIC, when the router cannot configure BER with the given interval, it selects an optimum interval that is supported for the given BER configuration. If the router is still not able to support the configuration (for example, with a wider gap between the degrade set and clear values), the default values are used and a log is generated.
For the P2-10G-40G-QSFPP PIC, the time interval is supported in multiples of 100 ms. For example, when you configure the interval as 10 ms, then it is rounded off to the nearest multiple of 100 ms.
Range: 1 ms through 1000 ms.
Default: 100 ms.
For the P2-100GE-OTN PIC, the default value is 10 ms.
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.