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Ken, Tried to post before you could reply but I've solved the problem. It would appear that the fiber is either damaged, or has always been installed wrong. I've been trying the different pairs in each cab to see if the fiber had been wired up incorrectly. I finally came across a connection...

Ken, Thanks for that mate, it looks like my problem might be fiber related in that case and I can stop hastling Nortel and my supplier! (which they'll no doubt be relieved about!) I have nothing plugged into the copper ports 23/24 on either switch. Finding our what fiber I have is going to be...

Guys, Thanks for the replies. In answer to your questions then... Rick, I tried configuring a MLT for ports 23/24 on both 5510's but this still did not work. Anthony, yes, the SFP GBIC's are Nortel. Ken, the distance between cabinets (and therefore the switches) is around 120meters. I'm...

Rick, I hadn't looked at that yet predominently because the "In Use" light isn't coming on at all. Will check now and get back to you Karl

Hello guys, First post so be gentle if this turns out to be a noob question! I've recently bought two Nortel 5510-24T switches, each with a 1000sx SFP GBIC to go either end of my 8-core fiber backbone. First thing I've done after putting the GBIC's in to the switches (put in port 23 in both...