Fiber Optic connection, Crossover cable needed?

ressem

Hi, I can't get a link over fiber and was hoping someone could point out where I'm going wrong.

The electrician mentioned that we needed a LC-SC duplex patch cable and a SX transceiver on each end.

Now the hardware all appears to be working but I can't get a link between the two switches. The laser is being received at each end.
One thing I have noticed is that even though there are two fiber optic cables making up each lead, both devices are lighting up the same line. A layman's view would suggest that each side should be using one cable to send and the other to receive.
The cables and transceivers are keyed so I don't think I can have them upside down.

So is a crossover fiberoptic patch cable needed? Or has anyone any ideas as to what I'm missing (other than sense letting myself get dragged into area in which I'm clueless). Have i got the wrong hardware or leads (below)?

A wall mounted cabinet wired with fiber optic cabling ( 8 Core 62.5/125, that's multimode, right?) to the main network cabinet was installed.

2 x Belkin MULTIMODE LC/SC DUPLEX PATCH CABLE
1 x 3Com 3Com Baseline 2948-SFP, and a 3Com Baseline 2924-SFP. and 3COM 1000BASE-SX SFP tranceivers, for each end.

ressem

Never mind. Pulled out the patch panel and swapped the two cables at the back of the port and all worked.