What's the predominant connectivity standard for 10 gigabit data centers?

What is the predominant media type (copper, fiber), signalling standard (LR/SR, etc...) and connector type (XPAK, SFP, etc...) being used for 10 gigabit networking in enterprise data centers today and what's expected in the near future (12-18 months out?) I'd like a link to some research and/or confirmation from those who have experience working in or designing data centers.
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jjeff1Connect With a Mentor Commented:
I think the answer is largely dependand on the size of the center and the hardware required. I doubt very much you'll make the plug format a major issue in choosing a network device.

The SR/LR issue is dependant on distance between devices. Same with fiber vs copper.
Copper is cheaper and cabling can be made and tested by hand with cheap tools, so it's popular. Fiber is required when you have longer distances or have severe electical interference.

The connector type is dependant on the switch manufacturer. GBIC was popular, SFP is more popular now, mostly because it's smaller and people want higher port density per U.

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