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RTN 910 FEC Alarm

RTN 910 FEC Alarm

Created: Jul 24, 2019 03:53:42Latest reply: Jul 25, 2019 08:40:59 665 3 0 0 0
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Hi, May I know about FEC alarm on RTN links. How can be effect that alarm to traffic.

RTNAlarmFEC

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yogijain
HCIE Created Jul 24, 2019 04:17:18


Hi
Please find  the details as desired 


MW_FEC_UNCOR

Description

The MW_FEC_UNCOR is an alarm indicating that radio frames forward error correction (FEC) encoding cannot be corrected.

Attribute

Alarm SeverityAlarm Type
MinorCommunication alarm

Parameters

None.

Impact on the System


Bit errors occur in the services. If the equipment is configured with 1+1 FD/SD protection, HSM channel protection switching may be triggered.

Possible Causes

  • Cause 1: The receive power of the ODU is abnormal.
  • Cause 2: The transmit unit of the opposite station is faulty.
  • Cause 3: The receive unit of the local site is faulty.
  • Cause 4: An interference event occurs.

Procedure

  1. Cause 1: The receive power of the ODU is abnormal.
    1. At the local end, check whether the receive power of the ODU is normal. If yes, determine the abnormality and take proper measures. For details, see Querying the Historical Transmit Power and Receive Power.
    If...Then...

    The RSL is lower than the receiver sensitivity

    Follow the steps:

    1. Check the installation of the antenna to ensure that the azimuth of the antenna meets the requirement.

    2. Check the antenna direction. Check whether the received signal is from the main lobe.

      If the antenna direction does not meet the requirement, adjust the antenna in a wide range.

    3. Check whether the setting of the polarization direction of the antenna is correct. Adjust the incorrect polarization direction.
    4. Check whether the antenna gain at both the transmit and receive ends meets the specifications. Replace the antennas that do not meet the requirement.

    5. Check whether any mountain or building obstacle exists in the transmit direction.

      If yes, contact the network planning department for proper modification of the planning design, hence preventing the block of the mountain or building obstacle.

    The RSL is higher than the specified RSL of the network. The offset value is tens of decibels. The duration is from tens of seconds to several hours.

    Slow up fading occurs. Follow the steps:

    1. Check whether any co-channel interference occurs.

      1. Mute the ODU at the opposite end. For details, see Configuring the IF/ODU Information of a Radio Link.
      2. Check the RSL at the local end. For details, see Configuring the IF/ODU Information of a Radio Link. If the RSL exceeds -90 dBm, it indicates that there is co-channel interference that may affect the long-term availability and errored-second performance of the system.
    2. Use a spectrum analyzer to analyze the interference source.
    3. Contact the spectrum management department to clear the interference spectrum or change plans to minimize the interference.

    The RSL is lower than the specified RSL of the network. The offset value is tens of decibels. The duration is from tens of seconds to several hours.

    Slow down fading occurs. Generally, the radio link may be faulty in both directions, because slow fading is imposed by the transmission path. Contact the network planning department to make the following changes:

    • Increase the installation height of the antenna.
    • Reduce the transmission distance.
    • Increase the antenna gain.
    • Increase the transmit power.

    If the RSL is lower than or higher than the specified RSL of the network and if the duration is from several milliseconds to tens of seconds.

    Fast fading occurs. Contact the network planning department to make the following changes:

    • Adjust the position of the antenna to block the reflected wave or make the reflection point fall on the ground that has a small reflection coefficient, therefore reducing the multipath fading.
    • Adjust the RF configuration to make the links in the 1+1 SD configuration.
    • If the links are configured with the 1+1 SD protection, adjust the height offset between two antennas to make the receive power of one antenna stronger than the receive power of the other antenna.
    • Increase the fading margin.
  2. Cause 2: The transmit unit of the opposite station is faulty.

    Locate the fault by looping back the opposite station and excluding the position one by one. Follow the steps:

    1. Perform an inloop on the IF port at the opposite end. For details, see 5.5.2 Setting Loopback for the IF Board. Check whether the fault at the opposite end is rectified after the loopback.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the IF board.
      The fault at the opposite end is rectifiedGo to the next step.
    2. Check whether the cable connector is prepared according to the requirement. If any cable connector does not meet the requirement, make a new connector.
    3. Check whether the IF cable is wet, broken, or pressed. Replace the cable that does not meet the requirement.
    4. Then, check whether the fault at the opposite end is rectified.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the ODU at the opposite end.
      The fault at the opposite end is rectifiedEnd the alarm handling.
  3. Cause 3: The receive unit of the local site is faulty.

    Locate the fault by looping back the opposite station and excluding the position one by one. Follow the steps:

    1. Perform an inloop on the IF port at the local end. For details, see 5.5.2 Setting Loopback for the IF Board. Check whether the fault at the local end is rectified after the loopback.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the IF board.
      The fault at the opposite end is rectifiedGo to the next step.
    2. Check whether the cable connector is prepared according to the requirement. If any cable connector does not meet the requirement, make a new connector.
    3. Check whether the IF cable is wet, broken, or pressed. Replace the cable that does not meet the requirement.
    4. Then, check whether the fault at the opposite end is rectified.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the ODU at the local end.
      The fault at the opposite end is rectifiedEnd the alarm handling.
  4. Cause 4: An interference event occurs.
    1. Check whether any co-channel interference occurs.
      1. Mute the ODU at the opposite end.
      2. Check the RSL at the local end. For details, see Configuring the IF/ODU Information of a Radio Link. If the RSL exceeds -90 dBm, it indicates that there is co-channel interference that may affect the long-term availability and errored-second performance of the system.
    2. Check whether any adjacent channel interference occurs.
      1. Mute the ODU at the opposite end.
      2. Adjust the radio working mode at the local end and use the minimum channel spacing. For details, see Configuring the IF/ODU Information of a Radio Link.
      3. Decrease the received frequency at the local end by a half of the channel spacing. For details, see Configuring the IF/ODU Information of a Radio Link.
      4. Test and record the RSL.
      5. Increase the received frequency at the local end, with a step length of 0.5 MHz or 1 MHz, and record the RSL accordingly until the received frequency is equal to the original received frequency plus a half of the channel spacing.
      6. Compare the recorded RSLs, and check whether the RSL in a certain spectrum is abnormal if the received frequency is within the permitted range.
    3. Use a spectrum analyzer to analyze the interference source.
    4. Contact the spectrum management department to clear the interference spectrum or change plans to minimize the interference.

https://support.huawei.com/enterprise/en/doc/EDOC1000029126?section=j009

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yogijain
yogijain HCIE Created Jul 24, 2019 04:17:18


Hi
Please find  the details as desired 


MW_FEC_UNCOR

Description

The MW_FEC_UNCOR is an alarm indicating that radio frames forward error correction (FEC) encoding cannot be corrected.

Attribute

Alarm SeverityAlarm Type
MinorCommunication alarm

Parameters

None.

Impact on the System


Bit errors occur in the services. If the equipment is configured with 1+1 FD/SD protection, HSM channel protection switching may be triggered.

Possible Causes

  • Cause 1: The receive power of the ODU is abnormal.
  • Cause 2: The transmit unit of the opposite station is faulty.
  • Cause 3: The receive unit of the local site is faulty.
  • Cause 4: An interference event occurs.

Procedure

  1. Cause 1: The receive power of the ODU is abnormal.
    1. At the local end, check whether the receive power of the ODU is normal. If yes, determine the abnormality and take proper measures. For details, see Querying the Historical Transmit Power and Receive Power.
    If...Then...

    The RSL is lower than the receiver sensitivity

    Follow the steps:

    1. Check the installation of the antenna to ensure that the azimuth of the antenna meets the requirement.

    2. Check the antenna direction. Check whether the received signal is from the main lobe.

      If the antenna direction does not meet the requirement, adjust the antenna in a wide range.

    3. Check whether the setting of the polarization direction of the antenna is correct. Adjust the incorrect polarization direction.
    4. Check whether the antenna gain at both the transmit and receive ends meets the specifications. Replace the antennas that do not meet the requirement.

    5. Check whether any mountain or building obstacle exists in the transmit direction.

      If yes, contact the network planning department for proper modification of the planning design, hence preventing the block of the mountain or building obstacle.

    The RSL is higher than the specified RSL of the network. The offset value is tens of decibels. The duration is from tens of seconds to several hours.

    Slow up fading occurs. Follow the steps:

    1. Check whether any co-channel interference occurs.

      1. Mute the ODU at the opposite end. For details, see Configuring the IF/ODU Information of a Radio Link.
      2. Check the RSL at the local end. For details, see Configuring the IF/ODU Information of a Radio Link. If the RSL exceeds -90 dBm, it indicates that there is co-channel interference that may affect the long-term availability and errored-second performance of the system.
    2. Use a spectrum analyzer to analyze the interference source.
    3. Contact the spectrum management department to clear the interference spectrum or change plans to minimize the interference.

    The RSL is lower than the specified RSL of the network. The offset value is tens of decibels. The duration is from tens of seconds to several hours.

    Slow down fading occurs. Generally, the radio link may be faulty in both directions, because slow fading is imposed by the transmission path. Contact the network planning department to make the following changes:

    • Increase the installation height of the antenna.
    • Reduce the transmission distance.
    • Increase the antenna gain.
    • Increase the transmit power.

    If the RSL is lower than or higher than the specified RSL of the network and if the duration is from several milliseconds to tens of seconds.

    Fast fading occurs. Contact the network planning department to make the following changes:

    • Adjust the position of the antenna to block the reflected wave or make the reflection point fall on the ground that has a small reflection coefficient, therefore reducing the multipath fading.
    • Adjust the RF configuration to make the links in the 1+1 SD configuration.
    • If the links are configured with the 1+1 SD protection, adjust the height offset between two antennas to make the receive power of one antenna stronger than the receive power of the other antenna.
    • Increase the fading margin.
  2. Cause 2: The transmit unit of the opposite station is faulty.

    Locate the fault by looping back the opposite station and excluding the position one by one. Follow the steps:

    1. Perform an inloop on the IF port at the opposite end. For details, see 5.5.2 Setting Loopback for the IF Board. Check whether the fault at the opposite end is rectified after the loopback.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the IF board.
      The fault at the opposite end is rectifiedGo to the next step.
    2. Check whether the cable connector is prepared according to the requirement. If any cable connector does not meet the requirement, make a new connector.
    3. Check whether the IF cable is wet, broken, or pressed. Replace the cable that does not meet the requirement.
    4. Then, check whether the fault at the opposite end is rectified.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the ODU at the opposite end.
      The fault at the opposite end is rectifiedEnd the alarm handling.
  3. Cause 3: The receive unit of the local site is faulty.

    Locate the fault by looping back the opposite station and excluding the position one by one. Follow the steps:

    1. Perform an inloop on the IF port at the local end. For details, see 5.5.2 Setting Loopback for the IF Board. Check whether the fault at the local end is rectified after the loopback.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the IF board.
      The fault at the opposite end is rectifiedGo to the next step.
    2. Check whether the cable connector is prepared according to the requirement. If any cable connector does not meet the requirement, make a new connector.
    3. Check whether the IF cable is wet, broken, or pressed. Replace the cable that does not meet the requirement.
    4. Then, check whether the fault at the opposite end is rectified.
      If...Then...
      The fault at the opposite end is not rectifiedReplace the ODU at the local end.
      The fault at the opposite end is rectifiedEnd the alarm handling.
  4. Cause 4: An interference event occurs.
    1. Check whether any co-channel interference occurs.
      1. Mute the ODU at the opposite end.
      2. Check the RSL at the local end. For details, see Configuring the IF/ODU Information of a Radio Link. If the RSL exceeds -90 dBm, it indicates that there is co-channel interference that may affect the long-term availability and errored-second performance of the system.
    2. Check whether any adjacent channel interference occurs.
      1. Mute the ODU at the opposite end.
      2. Adjust the radio working mode at the local end and use the minimum channel spacing. For details, see Configuring the IF/ODU Information of a Radio Link.
      3. Decrease the received frequency at the local end by a half of the channel spacing. For details, see Configuring the IF/ODU Information of a Radio Link.
      4. Test and record the RSL.
      5. Increase the received frequency at the local end, with a step length of 0.5 MHz or 1 MHz, and record the RSL accordingly until the received frequency is equal to the original received frequency plus a half of the channel spacing.
      6. Compare the recorded RSLs, and check whether the RSL in a certain spectrum is abnormal if the received frequency is within the permitted range.
    3. Use a spectrum analyzer to analyze the interference source.
    4. Contact the spectrum management department to clear the interference spectrum or change plans to minimize the interference.

https://support.huawei.com/enterprise/en/doc/EDOC1000029126?section=j009

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aselac
aselac Created Jul 24, 2019 10:08:41

Thanks.
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V84083177
V84083177 Created Jul 25, 2019 08:40:59


FEC_BEF_COR_ER indicates the BER before the FEC is performed.

This event indicates the impact of the external environment on the transmission.


•FEC_COR_BYTE_CNT indicates the number of bytes corrected through the FEC.

This event indicates the impact of the FEC.


•FEC_UNCOR_BLOCK_CNT indicates the number of frames that cannot be corrected through the FEC.

This event indicates the number of blocks that cannot be corrected through the FEC.

If a byte cannot be corrected, the MW_FEC_UNCOR alarm is reported.

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