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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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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).
An Optical Interface Cannot Turn Up

An Optical Interface Cannot Turn Up

Fault Description

After an optical interface is connected to a remote device through an optical fiber, its LINK indicator is off.

Possible Causes

  • The optical fiber is faulty.
  • The optical module on the optical interface cannot meet the requirements.
  • The optical attenuator used cannot meet the requirements.
  • A combo interface is used but the interface type is not set to optical interface. For example, GE0/0/0 on the panel of an AR2220, AR2220E, AR2240, AR3260, or AR2220-S, or AR2240-S router is a combo interface.

Troubleshooting Procedure

  1. Replace the optical fiber and optical module and check whether the optical interface can turn Up. Ensure that the optical module meets the following requirements.
  2. Determine optical module attributes.
    • The optical module has passed Huawei certification.
    • The transmission speed of the optical module is the same as the interface speed.
    • The wavelength of the optical module is the same as that of the remote optical module.
    • The transmission distance of the optical module is suitable for the actual distance between the two devices.
      • The transmission distance of an optical module is 10 km, 15 km, 20 km, 40 km, or 80 km. The optical modules with a longer transmission distance have a higher transmit power. If an optical module with a long transmission distance is used for short-distance transmission, the optical interface cannot turn Up because the transmit power is too high. The high transmit power may even burn the receiver of the remote optical module. To reduce the transmit power in this situation, use an optical attenuator between the optical module and optical fiber.
      • Optical modules with different speeds are available, for example, 155 Mbit/s, 622 Mbit/s, and 1.25 Gbit/s. It is recommended that you use an optical module with the same speed as the optical interface to ensure efficient optical transmission.
  3. If the interface is a combo interface, run the display this command in the interface view to check whether the interface type has been set to optical interface.
    <Huawei> system-view                                                                     
    Enter system view, return user view with Ctrl+Z                                               
    [Huawei] interface GigabitEthernet 0/0/0                                                 
    [Huawei-GigabitEthernet0/0/0] display this                                               
    interface GigabitEthernet0/0/0                                                                
    combo-port fiber                                                                              

    If the combo interface type is electrical interface, run the combo-port fiber command to configure it as an optical interface.

    <Huawei> system-view                                                                     
    Enter system view, return user view with Ctrl+Z                                               
    [Huawei] interface GigabitEthernet 0/0/0                                                 
    [Huawei-GigabitEthernet0/0/0] combo-port fiber                                           
  4. Run the display transceiver verbose command to check whether any alarms about the optical module have been generated. If such alarms are displayed, handle the problem according to the alarms. For example, if an alarm shows that the receive signal strength is too high, use an optical attenuator between the remote optical module and the optical fiber.
    <Huawei> display transceiver verbose                                                     
    GigabitEthernet0/0/0 information:                                                             
    Electronic label information:                                                                 
    Description:     2100Mb/sec-1550nm-LC-104km(0.009mm)                                          
    Type:                 FTLF1619P1BCL                                                           
    VendorSN:               PL80MZP                                                               
    Manufacturing Date:   2011-08-15                                                              
    Manufacturer:         FINISAR CORP                                                            
    Alarm information:    RX power High                                                      
    Realtime information:                                                                         
    Temperature(¡æ):                                 24                                           
    Voltage(V):                                     3.31                                          
    Bias Current(mA):                              18.09                                          
    Bias High Threshold(mA):                       95.00                                          
    Bias Low  Threshold(mA):                        4.00                                          
    Current Rx Power(dBM):                         -43.45                                         
    Default Rx Power High Threshold(dBM):          -8.23                                          
    Default Rx Power Low  Threshold(dBM):          -27.95                                         
    Current Tx Power(dBM):                          2.12                                          
    Default Tx Power High Threshold(dBM):           7.00                                          
    Default Tx Power Low  Threshold(dBM):          -2.00                                          
    User Set Rx Power High Threshold(dBM):          -8.23                                         
    User Set Rx Power Low Threshold(dBM):          -27.95                                         
    User Set Tx Power High Threshold(dBM):          7.00                                          
    User Set Tx Power Low Threshold(dBM):          -2.00                                          
    Default Temperature high  Threshold(¡æ):        103                                           
    Default Temperature low   Threshold(¡æ):         -8                                           

    The attenuation coefficients of single-mode fibers with 1310 nm and 1550 nm wavelengths are 0.4 dB/km and 0.25 dB/km respectively.

  5. If the interface remains Down, contact technical support personnel through Collecting Information and Contacting Technical Support.
Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 445580

Downloads: 4299

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