07-30-2013 10:23 AM
Some ports are showing as error RX power > 100uWatt
Rx power: 166.9 uWatt, Rx power: 65.3 uWatt, Rx power: 192.9 uWatt, Rx power: 141.7 uWatt,Rx power: 162.2 uWatt, Rx power: 109.1 uWatt, Rx power: 2.1 uWatt
However it's showing a port with 2.1uWatt as error.
What is the recommended value? What could be causing this error?
Thanks in advance.
07-30-2013 11:27 AM
optical powers are usually measured in dBm. psl see http://www.rapidtables.com/convert/power/mW_to_dBm.htm
However a typical SFP has a Window form -1dBm to -10dBm or 800uW to 100uW
if you do a sfpshow you see this information at the bottom:
low high low high
Temperature: 43 Centigrade -5 85 0 75
Current: 7.338 mAmps 2.500 12.000 2.000 11.500
Voltage: 3294.6 mVolts 3000.0 3600.0 3130.0 3460.0
RX Power: -3.3 dBm (473.1uW) 31.6 uW 1258.9 uW 31.6 uW 794.0 uW
TX Power: -4.0 dBm (399.6 uW)126.0 uW 1258.9 uW 251.0 uW 794.0 uW
So the RX window for this 16G SX SFP is here 31.6uW to 794uW
Thus 2.1 uW is clearly out of Spec.
Check the TX power on the other site. if it is ok, you have dirty connections or a broken cable
07-30-2013 01:20 PM
Thanks a lot for the information.
So this will be measure by the SFP port that is been used, correct?
So for a 8GB port the values will be different?
07-30-2013 10:53 PM
This is correct.
Just do the sfpshow for the specific port you use and you will get the min/max levels for warnings and alarms.
The min/max values are usually set by the vendors (e.g Finisar, Avago, ...) but might be harmonized by Brocade.
Never checked that so far ;-)