Many rack-mounted power systems and power supplies are specified as being 1U, 2U, 3U, etc. What does this mean? For electronic equipment racks (e.g., 19 or 23 inches wide), the term 1U is used to ...

Any recommendations for a decent 1u rack mount that would have SFP+ capabilities, and potentially a 4 port 1000BaseT NIC? I was thinking I'd pick something up to throw on my rack as my router to run ...