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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).
FCS_ERR

FCS_ERR

Description

The FCS_ERR is an alarm indicating that errors occur in the verification of the frame check sequence (FCS). This alarm occurs if errors occur when a board performs FCS verification of the received GFP frames.

NOTE:

This alarm is reported when the local end receives the GFP service.

If an idle frame encapsulated in the GFP format is detected, errors occur in the verification of the FCS because the idle frame does not contain the FCS field.

Attribute

Alarm Severity Alarm Type

Critical

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

The value is always 0x01, and this parameter is meaningless.

Parameter 2, Parameter 3

Indicate the VCTRUNK number where the alarm occurs.

Impact on the System

  • If the FCS_ERR alarm occurs due to inconsistent encapsulation protocols, the services are interrupted.
  • If the FCS_ERR alarm occurs due to bit errors present in the system, packet loss occurs in the services or the services are interrupted.

Possible Causes

The possible causes of the FCS_ERR alarm are as follows:

  • Cause 1: The data parameters at both ends are inconsistent.
  • Cause 2: The performance of the service transmission line degrades.
  • Cause 3: A certain board is faulty.

Procedure

  1. Cause 1: The data parameters at both ends are inconsistent.
    1. The mapping protocols at both ends are different. For instance, the local end adopts the GFP encapsulation protocol, whereas the opposite end adopts the LAPS encapsulation protocol. Or, the settings of the protocol parameters at both ends are inconsistent. For instance, the mapping protocols at both ends are GFP, but Extension Header Option at the local end is set to Yes and Extension Header Option at the opposite end is set to No.
    2. Query the encapsulation protocol and the settings of the protocol parameters of the VCTRUNK port that reports the FCS_ERR alarm at both ends, such as Scramble and Set Inverse Value for CRC.
    3. Check whether the alarm is cleared. If the alarm persists, go to 2.
  2. Cause 2: The performance of the service transmission line degrades.
    1. The performance of the transmission line degrades if the fiber connector is loose or dirty, the fiber or cable is faulty, or the components for the transmission are not in good contact. Check whether the alarms related to errors and optical power and the performance events related to errors occur in the service transmission line.

      If...

      Then...

      The BIP_EXC, BIP_SD, B3_EXC, B3_SD, IN_PWR_ABN, RSBBE, MSBBE, HPBBE, or LPBBE occurs

      Take priority to clear the preceding alarms or performance events. Check whether the alarm is cleared. If the alarm persists, go to 3.

      The preceding alarms or performance events do not occur

      Go to 3.

  3. Cause 3: A certain board is faulty.
    1. Replace the board directly.
    2. Check whether the alarm is cleared. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information

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Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75845

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