Hardware Terms Confusion

Hi fellas,

I have a confusion in understanding the terms in hardware. What is called as
blade, Cross bar connector , Switch fabric and Shared bus connector. I
googled it and found all the definitions buts still have some confusion
regarding the entire understanding of it.Can someone help me out in
explaining these terms in a simple manner.
THank You

-- 
With Warmest Regards,
CCIE KID
CCIE#29992 Security
Blogs and organic groups at http://www.ccie.net