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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).
DCN_CHANNEL_BITERROR

DCN_CHANNEL_BITERROR

Description

The DCN_CHANNEL_BITERROR alarm indicates a bit error on an outband DCN channel. This alarm is reported when a bit error has occurred on an outband DCN channel.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1, Parameter 2

Indicate the board slot ID corresponding to an outband DCN channel.

Parameter 3, Parameter 4

Indicate the subboard ID corresponding to an outband DCN channel.

Parameter 5, Parameter 6

Indicate the board port number corresponding to an outband DCN channel.

Parameter 7

Indicates the type of an outband DCN channel.
  • 0x00: no outband DCN channel
  • 0x01: channels D1 to D3
  • 0x02: channels D4 to D12
  • 0x03: channels D1 to D12
  • 0x04: channels D4 to D6
  • 0x05: channels D7 to D9
  • 0x06: channels D10 to D12
  • 0x07: channel D1
  • 0x0A: channels MD1 to D3
  • 0x0B: channel MD4_D12
  • 0x0C: channel MD1_D12
  • 0x0D: channel GCC0
  • 0x0E: channel GCC12_9
  • 0x0F: channel GCC12_18
  • 0x10: channel DCNOVERETH
  • 0x12: channel RES_ODU
  • 0x15: channel FE_DCN
  • 0x16: channel FE_DCN_ASON
  • 0x17: channel GCC0_18
  • 0x18: channel GCC1_24
  • 0x19: channel GCCM24
  • 0x1A: channel OSC_18

Parameter 8

Indicates the layer at which the alarm is reported.
  • 0x01: protocol layer
  • 0x02: physical layer
  • 0x03: overflowed transmit queue of the DCN channel

Impact on the System

There is no impact on services, but the DCN communication on the corresponding port may be interrupted.

Possible Causes

The possible causes of the DCN_CHANNEL_BITERROR alarm are as follows:
  • Cause 1: The outband DCN link is faulty.
  • Cause 2: The system control board or line board is faulty.
  • Cause 3: There are too many network packets in the DCN channel.

Procedure

  1. Cause 1: The outband DCN link is faulty.
    1. Check whether the outband DCN link at the local end is faulty.

      1. View alarm parameters 1 to 6, and locate the board port on which the alarm is reported.
      2. Check whether the receive optical power of the port is within the allowable range. For details about the optical power of optical modules, see Specifications of Optical/Electrical Modules.
        If… Then...

        The optical power is within an allowable range

        Go to the next step.

        The optical power is excessively high

        Increase the signal attenuation during the transmission process. Check whether the alarm is cleared. If the alarm persists, go to the next step.

        The optical power is excessively low

        Check whether the fibers are intact, the fiber connectors are clean, and the transmit optical power of the peer line board is normal. Then check whether the alarm is cleared. If the alarm persists, go to the next step.

      3. Check whether the port and fiber connected to the port are normal. Replace the fiber with an intact one, and check whether the alarm is cleared.
        If… Then...

        The alarm is cleared

        The original fiber is faulty. Replace the fiber.

        The alarm persists

        Go to the next step.

      4. Check whether the port and optical module connected to the port are normal. Replace the optical module with a functional optical module that matches the port on the line board, and check whether the alarm is cleared.
        If… Then...

        The alarm is cleared

        The original optical module is faulty. Replace the optical module.

        The alarm persists

        Go to the next step.

    2. Check whether the outband DCN link at the peer end is faulty.

      1. Locate the faulty board according to the network diagram. For example, in Figure 4-3, the faulty board is the system control board on NE1.
        Figure 4-3  Network diagram for analyzing the DCN_CHANNEL_BITERROR alarm
      2. Check whether the optical power of the outband DCN port on NE2 connected to the faulty port on NE1 is within the allowable range. For details, see 1.a.ii.
      3. Check whether the fiber between the outband DCN port on NE2 and the faulty port on NE1 is faulty. For details, see 1.a.iii.
      4. Check whether the optical module connected to the outband DCN port on NE2 connected to the faulty port on NE1 is faulty. For details, see 1.a.iv.
      5. Check whether the alarm is cleared. If the alarm persists, go to the next step.

  2. Cause 2: The system control board or line board is faulty.
    1. Check whether the system control board and line board at the local end are faulty.

      1. If the device has the active and standby system control boards, perform an active/standby switchover. Then check whether the alarm is cleared.
        If… Then...

        The alarm is cleared

        The original active system control board is faulty. Replace the faulty board.

        The alarm persists

        Go to the next step.

        NOTE:
        If the device has only one system control board, attempt to cold reset the board, which may cause service interruption.
      2. Cold reset the line board specified by the alarm parameter. Then check whether the alarm is cleared.
        If… Then...

        The alarm is cleared

        The software or logic of the line board is faulty. No further action is required.

        The alarm persists

        The board is faulty. Replace the faulty board. For details, see Parts Replacement.

        Services are interrupted during the cold reset process.

    2. Check whether the peer line board is faulty.

      1. Locate the faulty board according to the network diagram. For example, in Figure 4-3, the faulty board is the system control board on NE1.
      2. Reset the system control board and line board on NE 2 in sequence. (For details, see 2.a.) Then check whether the alarm is cleared. If the alarm persists, go to the next step.
      3. Replace the line board connected to the outband DCN link on NE2. Then check whether the alarm is cleared.
        If… Then...

        The alarm is cleared

        The peer line board is faulty. Replace the faulty board.

        The alarm persists

        Go to the next step.

  3. Cause 3: There are too many network packets in the DCN channel.
    1. Check whether the DCNSIZE_OVER alarm is reported. If yes, handle the alarm with reference to DCNSIZE_OVER.
    2. If the DCNSIZE_OVER alarm is not reported, check whether a large number of alarms or events are reported on the NE. If yes, handle them one by one.
  4. Contact Huawei technical support engineers to handle the alarm.

Related Information

Multiple DCN_CHANNEL_BITERROR alarms reported by the same NE are displayed as only one alarm record on the NMS, and the extended parameters of the alarm are those of the latest DCN_CHANNEL_BITERROR alarm. To view all DCN_CHANNEL_BITERROR alarms of the NE, perform the following operations:
  • Right-click the DCN_CHANNEL_BITERROR alarm in the alarm list, and choose Display > Alarm Logs from the shortcut menu.

  • In the Alarm Logs list, view all DCN_CHANNEL_BITERROR alarms reported by the NE.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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