I am moving my business into a new office over the weekend. There is space for around 20 workstations (I haven't counted exactly yet but its around that figure and I'm at home now so cant check exactly) There are neat desk level wall sockets and an Ethernet/ Telephone plug socket for each desk space running around the walls in conduit. The Ethernet cabling for all the Ethernet ports in the office run back into the server room next door to the office and to the back of the server rack and at least half of the cables still have their Ethernet plugs on still (some are just cut off and I will need to add plugs). All the cabling appears to be numbered and so are the ports in the wall which should help somewhat! Basically what I want to do is buy a large gigabit switch to put in the existing server rack and plug the Ethernet cables into it so that the Ethernet ports running along the walls of the office all work. The internet and phone lines are getting activated on the 30th Dec and I will have an ADSL2 modem which I will plug into the switch to give internet access to all these ports. I have no idea if the existing network cabling is cat5, cat6 POE etc and dont know the difference so my questions are: How do I know what type of Ethernet is wired in there already? What type of Ethernet (Cat 5/6 etc) do I need for normal networking of standard PC's like you would at home to a regular home router? If the Ethernet is setup in a certain way (Cat5,Cat6 etc) and I need the other type, would I just be able to crimp new plugs onto the ends of the wires to make it work or would I have to recable new wires it all as there would be missing internal wires? What tools will I need to do this? I am assuming a network tester, crimping tool and spare Ethernet plugs I'm going back in on Monday to make sense of this mess and will try to take pictures to show the setup in more detail. I am very competent in computer building, but my knowledge of networking doesn't stretch further than setting up a basic home network on a broadband modem/router and I've never tried crimping network cables before.