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  • 1.  Laser rx power low alarm/ low warning ?

    Posted 05-22-2013 20:24

    Hi all,

     

    I have a problem with "Laser rx power low alarm/ low warning" as below:

     

    EX4200# run show interfaces diagnostics optics xe-2/1/0
    Physical interface: xe-2/1/0
    Laser bias current : 63.998 mA
    Laser output power : 1.1020 mW / 0.42 dBm
    Module temperature : 28 degrees C / 82 degrees F
    Laser rx power : 0.0138 mW / -18.60 dBm
    Laser bias current high alarm : Off
    Laser bias current low alarm : Off
    Laser bias current high warning : Off
    Laser bias current low warning : Off
    Laser output power high alarm : Off
    Laser output power low alarm : Off
    Laser output power high warning : Off
    Laser output power low warning : Off
    Module temperature high alarm : Off
    Module temperature low alarm : Off
    Module temperature high warning : Off
    Module temperature low warning : Off
    Laser rx power high alarm : Off
    Laser rx power low alarm : On
    Laser rx power high warning : Off
    Laser rx power low warning : On
    Module not ready alarm : Off
    Module power down alarm : Off
    Tx data not ready alarm : Off
    Tx not ready alarm : Off
    Tx laser fault alarm : Off
    Tx CDR loss of lock alarm : Off
    Rx not ready alarm : Off
    Rx loss of signal alarm : Off
    Rx CDR loss of lock alarm : Off
    Laser bias current high alarm threshold : 110.000 mA
    Laser bias current low alarm threshold : 10.000 mA
    Laser bias current high warning threshold : 100.000 mA
    Laser bias current low warning threshold : 20.000 mA
    Laser output power high alarm threshold : 1.7780 mW / 2.50 dBm
    Laser output power low alarm threshold : 0.7070 mW / -1.51 dBm
    Laser output power high warning threshold : 1.5840 mW / 2.00 dBm
    Laser output power low warning threshold : 0.7940 mW / -1.00 dBm
    Module temperature high alarm threshold : 85 degrees C / 185 degrees F
    Module temperature low alarm threshold : 0 degrees C / 32 degrees F
    Module temperature high warning threshold : 82 degrees C / 180 degrees F
    Module temperature low warning threshold : 0 degrees C / 32 degrees F
    Laser rx power high alarm threshold : 0.8912 mW / -0.50 dBm
    Laser rx power low alarm threshold : 0.0234 mW / -16.31 dBm
    Laser rx power high warning threshold : 0.7943 mW / -1.00 dBm
    Laser rx power low warning threshold : 0.0263 mW / -15.80 dBm

     

    Please some body help me explain what is the meaning of "Laser rx power low alarm ON / low warning ON", and how to solve this problem?

     

    Thanks all.



  • 2.  RE: Laser rx power low alarm/ low warning ?

    Posted 05-22-2013 20:26
    Have you checked the type of physical fibre used?
    You need to check on the RX and TX...


  • 3.  RE: Laser rx power low alarm/ low warning ?
    Best Answer

     
    Posted 05-23-2013 03:52

    hi,

     

    just compare what SFP gets:

    Laser rx power : 0.0138 mW / -18.60 dBm

     

    to alarm threshold:

    Laser rx power low alarm threshold : 0.0234 mW / -16.31 dBm

     

    Check optical path quality (SFPs/fiber/connections/etc).

    jtb



  • 4.  RE: Laser rx power low alarm/ low warning ?

    Posted 05-23-2013 23:42

    Hi all,

     

    Problem solved. Physical fiber.

    Thanks for your advice.