40 Gig troubleshooting 2 channels 1 side don't show light

[j2sw]

Folks,
I have a 2 Cisco switches with 40 Gig optics in each.  One side sees light on all 4 channels and everything looks good.  The other side does not see light on 2 of the 4 channels.  Where to start troubleshooting? I have tried different ports on the switches.

[marce1000]

       - Try changing  polarity  (flip), on a fiber patch cord ,

 M.

[MHM Cisco World]

show interfaces transceiver details <<- share this

[j2sw]

Side A

thernet1/53
transceiver is present
type is QSFP-40G-ER4
name is CISCOSOLIDOPTICS
part number is QSFP-40G-ER4-LC
revision is 1A
nominal bitrate is 10300 MBit/sec per channel

    Link length supported for 9/125um fiber is 40 km

    cisco id is 13

    cisco extended id number is 204

Lane Number:1 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   48.61 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.19 V         3.70 V      2.90 V      3.59 V        3.00 V

  Current       45.96 mA       85.00 mA    10.00 mA    80.00 mA      15.00 mA

  Tx Power       0.24 dBm       5.49 dBm   -4.50 dBm    4.99 dBm     -4.00 dBm

  Rx Power     -10.17 dBm      -5.00 dBm  -25.22 dBm   -7.01 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:2 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   48.61 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.19 V         3.70 V      2.90 V      3.59 V        3.00 V

  Current       46.22 mA       85.00 mA    10.00 mA    80.00 mA      15.00 mA

  Tx Power       1.30 dBm       5.49 dBm   -4.50 dBm    4.99 dBm     -4.00 dBm

  Rx Power     -10.86 dBm      -5.00 dBm  -25.22 dBm   -7.01 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:3 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   48.61 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.19 V         3.70 V      2.90 V      3.59 V        3.00 V

  Current       44.01 mA       85.00 mA    10.00 mA    80.00 mA      15.00 mA

  Tx Power       0.54 dBm       5.49 dBm   -4.50 dBm    4.99 dBm     -4.00 dBm

  Rx Power     -10.04 dBm      -5.00 dBm  -25.22 dBm   -7.01 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:4 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   48.61 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.19 V         3.70 V      2.90 V      3.59 V        3.00 V

  Current       43.14 mA       85.00 mA    10.00 mA    80.00 mA      15.00 mA

  Tx Power       1.14 dBm       5.49 dBm   -4.50 dBm    4.99 dBm     -4.00 dBm

  Rx Power      -9.50 dBm      -5.00 dBm  -25.22 dBm   -7.01 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

IPLVINE733-NEXUS100GIG_SW-01#

[j2sw]

Side B

Ethernet2/1

    transceiver is present

    type is QSFP-40G-ER4

    name is CISCOSOLIDOPTICS

    part number is QSFP-40G-ER4    

    revision is 1A 

    nominal bitrate is 10300 MBit/sec per channel

    Link length supported for 9/125um fiber is 40 km

    cisco id is 13

    cisco extended id number is 204

Lane Number:1 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   20.50 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.37 V         3.79 V      2.70 V      3.70 V        2.79 V

  Current       28.46 mA      110.00 mA     5.00 mA   100.00 mA      10.00 mA

  Tx Power       1.93 dBm       5.99 dBm   -1.00 dBm    4.99 dBm      0.00 dBm

  Rx Power          N/A        -4.00 dBm  -25.22 dBm   -6.00 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:2 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   20.50 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.37 V         3.79 V      2.70 V      3.70 V        2.79 V

  Current       30.25 mA      110.00 mA     5.00 mA   100.00 mA      10.00 mA

  Tx Power       1.41 dBm       5.99 dBm   -1.00 dBm    4.99 dBm      0.00 dBm

  Rx Power      -3.94 dBm ++   -4.00 dBm  -25.22 dBm   -6.00 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:3 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   20.50 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.37 V         3.79 V      2.70 V      3.70 V        2.79 V

  Current       27.65 mA      110.00 mA     5.00 mA   100.00 mA      10.00 mA

  Tx Power       1.66 dBm       5.99 dBm   -1.00 dBm    4.99 dBm      0.00 dBm

  Rx Power      -7.09 dBm      -4.00 dBm  -25.22 dBm   -6.00 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

Lane Number:4 Network Lane

           SFP Detail Diagnostics Information (internal calibration)

  ----------------------------------------------------------------------------

                Current              Alarms                  Warnings

                Measurement     High        Low         High          Low

  ----------------------------------------------------------------------------

  Temperature   20.50 C        80.00 C    -10.00 C     75.00 C       -5.00 C

  Voltage        3.37 V         3.79 V      2.70 V      3.70 V        2.79 V

  Current       29.87 mA      110.00 mA     5.00 mA   100.00 mA      10.00 mA

  Tx Power       1.54 dBm       5.99 dBm   -1.00 dBm    4.99 dBm      0.00 dBm

  Rx Power          N/A        -4.00 dBm  -25.22 dBm   -6.00 dBm    -22.21 dBm

  Transmit Fault Count = 0

  ----------------------------------------------------------------------------

  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

[MHM Cisco World]

what the length of cable you use ??
if the length is two short 
THIS IS MY OPIONON NOT SUGGESTION SO FROM YOUR SIDE MAKE MORE CHECK ABOUT THIS POINT 
then check use Attenuator 
What Fiber Attenuator Do You Use? LC Attenuator or SC? | FS Community

[j2sw]

This is a dark fiber path. It is a 10-mile path.  This is why I am using the ER optics

[marce1000]

               >...This is a dark fiber path...
  - Has this fiber ever been tested for 'link integrity' , 

 M.

[MHM Cisco World]

  Rx Power      -3.94 dBm ++  <<- this make think that the length is short, the recommend length is 40 km and you use 16 km

[j2sw]

I am thinking I am going to try an attenuator.  Maybe too hot?

[j2sw]

fiber is fine. Can run a 10 gig optic over and has been verified with an OTDR

[marce1000]

  - According to switch models used , check (SFP) and other compatibility stuff with : https://tmgmatrix.cisco.com/

 M.