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ObrHt

 

Table 1: Alarm Details

Parameter

Description

Code

obrHt

Description

Optical Backreflection High Threshold Exceeded: The optical backreflection has exceeded the high threshold.

Entities Affected

  • DOL optical service channels (see respective table below).

  • Terminal amplifier Optical Supervisory Channels (see respective table below).

Possible Cause

The fiber connection is poor.

Default Severity

Minor

Service Affecting

Yes (true).

Alarm Clearing

See Clearing an ObrHt alarm.

Related Fault Hierarchy

See:

.

Table 2: DOL Optical Service Channels (OSCs)

Entity Name

 

Fault Indicator

Module

Indicator

Status

osc:<chassis>/<slot>/0/L1

ROADM2 or ILA

Fault LED, L1 port

Fault LED, L1 port

Table 3: Terminal Amplifier Optical Supervisory Channels (OSCs)

Entity Name

 

Fault Indicator

Module

Indicator

Status

osc:<chassis>/<slot>/1/<portNum>.<oscNum>

AMP1

–

–

Clearing an ObrHt Alarm

Note

Follow all applicable safety requirements as described in the BTI7800 Series Hardware Overview and Installation Guide.

  1. Optionally, if the alarm is raised against a DOL OSC entity, refer to DOL OSC power and optical backreflection alarm thresholds for optical-backreflection threshold information.
  2. Ensure that the span fiber at the Line output port is intact, thoroughly clean, and correctly connected.
  3. Ensure that the fiber connectors are compatible.
  4. Ensure that any downstream fiber connections are thoroughly cleaned and correctly connected, and that the span loss at the downstream node is in the supported range for operation. For more information about span loss, see the BTI7800 Series Software Configuration Guide.
  5. Check for alarms on the affected OSC.

    • If the alarm has cleared, you have completed this procedure.

    • If the alarm does not clear, contact your next level of support.

    Note

    The cleaning and reconnecting of fibers can increase (by several minutes) the amount of time the system requires to re-evaluate optical back-reflection ratio statistics for a DOL OSC entity and, therefore, show the obrHt alarm as cleared.