What could cause my SFP-10G-LR module faulty?

[Foo Chuan Soon]

I have a SFP-10G-LR module that running fine 3750x switch, but one day without any symptom the SFP not running, from the log it was show link down that is all, no power failure also. So what possible that will cause the module failure?

[Leo Laohoo]

How do you know the SFP+ is down due to fault?

Are you sure the SFP+ is inserted properly?  Due to heat and vibration the SFP+ could literally "slide" out.

What is the output to the command "sh interface status"?

[Foo Chuan Soon]

the interface status show down down, not connected. And i can sure it is inserted properly, i have remove and insert for several time but still the same result, even i plugged it to other port, still the same. I even run show inventory after i insert it, it was showing the correct information and detected by the switch, but still not able bring the link up, Once i insert a new SFP into the same port, without changing any config, the link immediate up.

[Leo Laohoo]

Ok.  RMA the module.  There's nothing else you can do.

[Foo Chuan Soon]

so it is my bad luck that cause the module faulty? any other possibility that will cause it faulty?

[Tom Randstrom · Accepted solution]

Unless the SFP's receive optical input level was too high; by attaching a higher output long-reach transceiver or an optically amplified signal, there isn't much you can do to damage the transceiver; outside of physical abuse (dropping the device or exposing it to high-humidity or water). Like any manufactured product, there will always be failures; thus the reason for product warranties and spares inventories.