ExtremeSwitching (EXOS)

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10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

  • 1.  10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

    Posted 08-15-2018 01:21
    HI experts ,I have connected one server on 10 gig port of exterme X460G2-24x-10G4. It is showing low Rx power and port is not coming up. Please help

    POC_SW01.23 # show ports 31 transceiver information

    Port Temp TxPower RxPower TxBiasCurrent Voltage-Aux1/ Voltage-Aux2
    (Celsius) (dBm) (dBm) (mA) Vcc (Volts) (Volts)
    ================================================================================
    31 31.06 -2.76 -26.78* 8.63 3.34 N/A
    ================================================================================
    N/A - parameter not applicable to transceiver connected to the port
    * - value is out of normal range


    # debug hal show optic port 31
    Port 31
    SFP or SFP+: SFP+
    Signal: not present
    TX Fault: no
    SFP/SFP+ Vendor: FINISAR CORP.
    SFP/SFP+ Part Number: FTLX8574D3BCL-EX
    SFP/SFP+ Serial Number: 1639P-05940
    SFP/SFP+ Manufacture Date: 160924
    SFP/SFP+ Type: SFP/SFP+
    Connector: LC
    Type: SR
    Wavelength: 850


  • 2.  RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

    Posted 08-15-2018 01:26
    why kind of fiber are you connecting it with? have you tried a different jumper?
    if the RX is low the issue is that the light is not getting to the receiver. can you see the light coming out of the server SFP? ( I know you are not supposed to look etc... so do so at your own risk, 850 nm LED is not tooo dangerious)



  • 3.  RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

    Posted 08-15-2018 01:26
    You can use a camera, e.g. from a phone, to avoid looking directly at the laser.


  • 4.  RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

    Posted 08-15-2018 07:06
    Please, do NOT look directly at the fiber.

    If Rx is too low, it's expected the port do not come up. The issue is either on the fiber plant, jumper, length, dust anywhere there's connection or the transmitter has an issue. Eventually a mix of all of it.


  • 5.  RE: 10 gig port of extreme X460G2-24x-10G4. It is showing low Rx power

    Posted 08-15-2018 07:31
    It’s possible you simply need to swap fibers on one end of the patch. This is a common problem. As others said, red led is transmit and should go to dark connector on the opposing device.