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Fibre Channel (SAN)

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Anonymous
Posts: 0

Do low SFP RX & TX Power levels indicate a hardware fault?

I have noticed the majority of the SFPs in our 4100 switches have tx power levels of between 300-400 uWatts. However there are a handful that are around the 260 uWatts level and these ports seem more likely to have enc_out errors.

Is this purely coincidental or does a low tx power (or rx power) level indicate a faulty cable, gbic or hba?

Anonymous
Posts: 0

Re: Do low SFP RX & TX Power levels indicate a hardware fault?

I have found in the past that replacing the SFP corrects these issues.

Anonymous
Posts: 0

Re: Do low SFP RX & TX Power levels indicate a hardware fault?

I think remember that the optical loss budget is -20db. If the typical Tx/Rx power is 300 uW, it would seem, that an input power of 3 uW would be adequate. A varation of a db or two would be inconsequential on the RX side. On the Tx side however, I don't know if it could indicate a problem.

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