Cannot get a link over a current working fibre with a different switch
Hi all, this is my problem.
I have two buildings in a campus that are connected by fibre, probably only a few hundred metres, and all works well. I'm trying to remove some switches and introduce some new ones. The existing ones are 3550s and have SC Gbics in them. The new switches are 3560s and have LC Gbics (GLS-SX-MM). When I connect these to the fibre, 3560 one end, and 3560 at the other, I get no link light, no matter what I try. I have tried different fly leads, of both 50 and 62.5 as I don't know what type of fibre connects these buildings.
From the testing I've done, it would point to an incompatible fibre, or Gbics that aren't up to the job, although I find this doubtful. I have tried these Gbics in test-lab switches, with the fly leads and all is OK. The only way I can introduce the 3560s is to leave the 3550s in place, and that's not what I want to do.
I can see light coming from the GBICs connected to the switch at both ends, but cannot see light at the other end of the campus, either way. This is why I'm suspecting an incompatible Gbic.
Re: Cannot get a link over a current working fibre with a differ
One thing to note, if your span is only a few hundred meters long, an OTDR is almost useless for troubleshooting. The initial pulse sent will saturate the OTDR's receiver and take 100-1000 meters to recover. The same thing happens at the end of the fiber. A 1000 meter launch cable and receive cable should be used to accurately see the fiber your testing.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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