Let's talk safety for a minute. If you don't know how to tell which conductor is which-and don't really seem to grasp the terminology, so that you have to describe what seems to be a coaxial cable instead of naming it-then you should leave this alone! A mistake could get you shocked very badly, or cause a very, very bad fire.
Contact Cisco and find out what they want for a new power adapter. Safe, guaranteed to work, and probably warranteed.