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Fiber Switch Connection Question

I've got a Cisco Catalyst 3550 that uses a GBIC module to connect another one of the same switches between buildings. This is a picture of the gbic module http://filedb.experts-exchange.com/incoming/2013/09_w39/679236/Front.JPG

We bought a Cisco Small Business SLM2048T-NA  to replace it that uses a different module pictured here : http://www.serversupply.com/NETWORKING/TRANSCEIVER/GBIC%20-%20SFP/CISCO/MGBSX1.htm

I used a LC connected cable to connect the new switch, but the switches won't make a connection. My question is, do the switch have to have the same connector/LC Cable to work or can these switches be connected? I posted a question before trying to figure out what GBIC module to buy for the new switch in this topic: http://www.experts-exchange.com/Hardware/Networking_Hardware/Switches/Q_28248325.html

I don't deal with many fiber connections and when I do they are normally already in place and don't have to mess with them.
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FIFBAAuthor Commented:
I guess I should say the customer isn't ready to swap out all of the cisco catalyst switches, so we want to connect the Cisco Small business switch to the catalyst using different GBIC modules. Just need to know if/how this would be possible.
Craig BeckCommented:
You've got the right SFP module, but sometimes you need to swap the cables over at one end - kind of like a crossover cable.

In fibre-optic links you usually have two cables - a TX and RX.  If you think about it the TX at one end needs to link to the RX at the other end, and vice-versa.

So, at the 3550 end, just swap A and B over and see if the link comes up.
FIFBAAuthor Commented:
Thanks Craig. I will talk to the guy and see how soon he can try this and let you know if it works. It may take a day or two for him to try it.
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