GBIC Laser Issue

[joveroc]

Many of my LX fiber connections have been going down recently. When I test the gbic with a light meter I get around -30 to -40 dbm, which is really low. I then replaced them with spares and the link comes back up every time. The new gbic's light level is around -10 dbm. Today (about 2 days since the last one went down) I go to test the bad gbics again just so that I can call TAC about it when I noticed that all of the failed gbics are back to putting out a -10 dbm level. Has anyone ever had a similar situation or know of any reason why the laser level would go down over time just to go right back up again after a day of inactivity?

Thanks

[wong34539]

I guess that the following will help you more troubleshooting steps on GBIC

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml#Gigabit_Ethernet_Troubleshooting.

[pao.bianco]

Hi,

have you checked device's environmental parameters (i.e. fan status, internal temperature etc?).

Were the gbics hot when you plugged them out?

It could be a temperature issue...

Regds

Paolo

[joveroc]

Well the room the 6513 is in stays around 18C. All the fans are active in the switch and airflow is unobstructed, but when I check system temp, it does show the exhaust temp for the fiber blades and being 30C. So it is possible that it may of overheated within the blade itself somehow. I will do some experiments and see.

Thanks for help