Issue on CWDM high Rx power

i have 2 test switches setup in a LAB, each switch connecting to each over CWDM-Mux-8A, using various differenet wave CWDM SFPs on both switches, and i have tried it using different ports on the Cisco switch, different CWDM MUX-8A, different CWDM SFP 1490, 1590, 1550, I even tried different Cisco switch, different switch port, and using different single mode fiber patch cable. All are new SFP and new patch cable and new CWDM MUX-8A. I even bypass the CWDM 8-port MUX directly, just connecting CWDM SFP 1490 ---to-----CWDM SFP 1490 directly, and also did the same for CWDM 1590….etc.   But i'm gettting below:
BAD Case: if I push the LC connector on both ends of the single mode fiber cable, all the way into the CWDM SFPs on both ends of this fiber cable , and stop when you hear the “clicking” sound, the interface just won’t come up on both sides of the switch, below is the show interface transceiver:
Test-SW01#
Test-SW01#sh int trans module 1
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
                                 Optical   Optical
           Temperature Voltage Tx Power Rx Power
Port       (Celsius)    (Volts) (dBm)     (dBm)
Gi1/1/1      38.2       3.55 +     8.1 +   -40.0
Gi1/1/4      39.3       3.30       2.1      -9.1
Test-SW01#
Good Case: but if I let one end of the fiber cable loosely hangs on the SFP port, not inserting fully by avoiding hearing the “click” sound when LC connector connecting to the CWDM SFP on one of the switch, then the interface will be UP on both side:
Test-SW01#
Test-SW01#
Test-SW01#sh int trans module 1
If device is externally calibrated, only calibrated values are printed.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
NA or N/A: not applicable, Tx: transmit, Rx: receive.
mA: milliamperes, dBm: decibels (milliwatts).
                                 Optical   Optical
           Temperature Voltage Tx Power
Rx Power
•12.Port       (Celsius)    (Volts) (dBm)     (dBm)
•13.--------- ----------- ------- -------- --------
•14.Gi1/1/1      39.2       3.29       2.8      -8.0
•15.Gi1/1/4      39.3       3.30       2.2      -9.0
•16.
•17.
•18.Test-SW01#
why is that ? how do i attenuate the Rx Power from -40 down to -8 ? do i need an external optical attenuator to adjust the power ? or is it because these are in LAB environment, the patch cable are too short, thus power is high ?
thanks,

I'm very curious what the issue is. Strange that it would work when the connector is fully seated in the SFP port. Are the optical jumpers from a name brand manufacturer? Is the connector end green or blue in color?
When connecting a CWDM SFP back to back, it should have 10dB attenuators placed in the path to prevent overloading the optical receiver in the SFP. It is possible, even with the MUX8A filters in-line with a short 15m fiber jumper, that you are over-loading the receivers; causing the system not be be able to decipher the signal. The info you provided above shows a transmit level of +8.1 dBm (higher than the typical +3dBm specification).
When you determine what the problem is, please post it on this site!
Thank you,

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Facility High Rx Power on 10DME card

Hi all
I found message "Facility high Rx Power" on 10DME card. So, I need to know what is the root cause and reason to get the message. Please give me the idea or comment.
Thanks
V
Note: Please see the picture from attach file

it is -8dBm threshold set on 10DME.
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http://www.cisco.com/en/US/prod/collateral/optical/ps5724/ps2006/ps5320/product_data_sheet0900aecd803fc51a.html
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Message was edited by: Eiichi133
Message was edited by: Eiichi133

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HI @KeithAusTX ,
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Sparkles1
I work on behalf of HP
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