Just a thought—is it possible to “burn out” the optics by using an overpowered SFP (like an XR where a LR should be used, etc)? I know I was cautioned strongly about making sure to not go too powerful when ordering SFPs in a past role. ---- Jack Kramer, Senior Consultant Small Type Computing - www.smalltype.net<http://www.smalltype.net> W: 855-765-8973 x101 - C: 248-635-4955
On Nov 10, 2017, at 4:05 PM, Micheal Espinola Jr <[email protected]<mailto:[email protected]>> wrote: I'm certainly no expert on this tech, but I've never heard of a situation like this or can I fathom how SFPs could be damaged like this. But the coincidental recurring circumstance? Fascinating! I wonder what other commonalities could possibly be involved. -- Espi On Fri, Nov 10, 2017 at 12:41 PM, Dave Eldridge <[email protected]<mailto:[email protected]>> wrote: wow you got me. I could see a gbic going bad on one side, but not propagating to the other side and taking it out also. On Fri, Nov 10, 2017 at 12:18 PM, CSSU NetAdmin <[email protected]<mailto:[email protected]>> wrote: Once failed, the GBIC's do not work- we swapped them all over. We cleaned all connections and have patch cable replacements on order. They did give us a copy of the certification report- it looks clean. The only reason we put in the 1 GB gbic's is because we don't have 10 GB's spares anymore. I am worried that the 1 GB's will fail too in a week or so. On Fri, Nov 10, 2017 at 12:59 PM, Eldridge, Dave <[email protected]<mailto:[email protected]>> wrote: So it failed, you replaced with 10gb gbics and it worked for a short period and it failed again and only now works at 1gb? Just curious if these “failed” gbics work in other fiber runs/switches of yours. You would have to match them at both ends, at least with my cisco’s. I have to say I have had to replace patch fibers before, especially single mode. Don’t be surprised. Have you cleaned all the connectors? The fact it works at the stepped down speed makes me suspicious. Did they give you a print out of the tdr test? dave From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of CSSU NetAdmin Sent: Friday, November 10, 2017 10:13 AM To: [email protected]<mailto:[email protected]> Subject: Re: [NTSysADM] Interesting Fiber Problem Yes, that is correct. We had to swap out the SFP's on both ends to get it working last Friday and again yesterday. On Thu, Nov 9, 2017 at 9:16 PM, Micheal Espinola Jr <[email protected]<mailto:[email protected]>> wrote: You are saying that the original SFPs became completely inoperable? Power-cycling or reseating the SFPs had no positive effect? You had to resort to replacing the SFPs with new/different units? You had to do this simultaneously on both ends? -- Espi On Thu, Nov 9, 2017 at 2:26 PM, CSSU NetAdmin <[email protected]<mailto:[email protected]>> wrote: We have an interesting situation with a dark fiber connection between two of our schools. For 15 months, the connection was great- an HP switch with 10 GB SFP on one end and a Sophos 10 GB SFO on the other. Last Friday, the connection dropped. After switching out the switch, the SFP for the switch and the SFP and port on the Sophos, the connection only came up when we replace the SFP's on both ends. It was fine until today- the connection dropped. We could only bring it back by replacing the SFP's- with 1 GB units because we did not have 10 GB replacements. Last week, our fiber provider test the fiber from both ends and it was clear all the way to other end- which is about 12 miles. We talked to them today and they remain convinced that the fiber is fine. We are going to replace the patch cables next but remain skeptical that it isn't an issue with the fiber somewhere along the line. Does anyone have suggestions on where else to look? Thanks!
