Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    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.

    Modified: 2017-04-25