Linking Switches through Multimode fibre cabling

I am looking at linking four switches with fibre a star network format. So one switch will have three fibre runs going from it. Firstly, how many cores does each run need? I assume that each connection will need two cores one for send and one for recieve, is this correct?

Secondly will standard cable work for a 1 gig connection?

Thirdly do you know how many mini GBIC (SFT) ports the D link DEM-312gt2 fibre transiever requires. I assume just the one but some metioned that maybe two are required.
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yes you are correct, you will need 2 cores, one for send and one for recieve. but you can use more cores and implement Link Aggregation or Rapid spanning tree to improve the resilience of the link (if the configuration is available on the switches)of course you will need to then buy more cable and mini gbic cards, so you have to weigh up your options.

I use 62.5/125 MM cable to the switches, i assume that it will work on yours too.

not sure about how many ports on the D link though sorry.
Yes, you need dual core cable. Duplex Multimode is the term used to describe the 62.5/125mm cable with two leads. The DEM-312 only accepts Multimode fiber. Multimode is generally Orange in color, sometimes grey. SingleMode is 9/125mm and yellow, and won't work with your equipment. Single mode uses a laser to push the light, multimode uses red LED. If you see "LX" and "SX" in the GBIC/SFP description, that equates to LX=Long Haul = single mode,  SX= Short Haul = Multimode

Next, you need to know what connection type you need. The DEM-312 uses "LC" type end connectors. You would need to order a multimode duplex cable, LC-LC, and the appropriate length. Unless, of course you have a fiber distribution box (like a patch panel for fiber) that has different connectors, then you need jumper cables like LC-ST or whatever..

The DEM-312 only takes up one SFP slot in the switch. Both of the fiber ends plug right into it.

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