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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
LCD

LCD

Description

The LCD alarm indicates that the OCD alarm is reported and persists within the transmission period of N cells. N indicates the LCD alarm threshold value, and it varies with the port type.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

None.

Impact on the System

  • All the services in the receive direction of the port are interrupted.
  • All the connections at the port insert the AIS cells in the segment or end point at the downstream station.

Possible Causes

Possible causes of the LCD alarm are as follows:

  • The SDH path connected to the alarmed ATM port fails to receive signals. For example, an SDH alarm, such as R_LOS, R_LOF, MS_AIS, AU_AIS, AU_LOP, TU_AIS, or TU_LOP, is reported in the SDH path.
  • A great number of bit errors occur in the SDH receive path connected to the alarmed ATM port. That is, some bit error alarms, such as the B1_SD, B2_SD, or B3_SD, are reported in the SDH path.
  • The ATM processing chip on the alarmed board is faulty.

Procedure

  1. On the U2000, check whether any alarm, such as R_LOS, R_LOF, MS_AIS, AU_AIS, AU_LOP, TU_AIS, or TU_LOP, is reported in the SDH path connected to the alarmed ATM port.
    If... Then...

    The R_LOS, R_LOF, MS_AIS, AU_AIS, AU_LOP, TU_AIS, or TU_LOP alarm is reported

    Handle the R_LOS, R_LOF, MS_AIS, AU_AIS, AU_LOP, TU_AIS, or TU_LOP alarm, and then check whether the LCD alarm is cleared. If the LCD alarm persists, go to the next step.

    The R_LOS, R_LOF, MS_AIS, AU_AIS, AU_LOP, TU_AIS, or TU_LOP alarm is not reported

    Go to the next step.

  2. On the U2000, check whether the B1_EXC, B2_EXC, or B3_EXC alarm which indicates bit errors on the tributary board exceeds the threshold is reported on the receive path.
    If... Then...

    The B1_EXC, B2_EXC, or B3_EXC alarm is reported

    Handle the alarms, and then check whether the LCD alarm is cleared. If the alarm persists, go to the next step.

    The B1_EXC, B2_EXC, or B3_EXC alarm is not reported

    Go to the next step.

  3. Reset (cold) the board that reports the LCD alarm. Then, check whether the alarm is cleared.

    If the services on the alarmed board are not protected, a cold reset on the board causes service interruption.

    If... Then...

    The alarm is cleared

    No further action is required.

    The alarm persists

    Go to the next step.

  4. Replace the board that reports the LCD alarm.

Related Information

End and segment

An end point refers to a termination point in a chain network, and it is used to monitor the whole virtual connection. A segment point is a dividing point on an ATM link. An ATM link can comprise of many segments. A segment point is used to monitor an ATM link segment and perform link continuity checks.

LCD alarm threshold values at different ports

For an external ATM port, the LCD alarm threshold is seven cells.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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