Hey, Thanks to all the suggestions, and especially the people offering to lend me a testing tool - I might take you up on that. But herre's what I tried, thanks to a suggestin from Nate. I took avery short length of Cat5e cable (like 2') and put a jack at both ends, thus simulating the wires in the wall. I know everything's punched down correctly, and I know the contacts are good because I stripped the ends off the copper before punching them down to make sure. I'm only using pins 1,2,3 and 6, because that's all ethernet needs, and those are going in a standard 568B pattern on both jacks (ie, a 1:1 connection between pins). When I connect a machine to the switch through this setup (using patch cables I have verified as working), I get a the LINK and ACTIVITY lights for that port blinking, but that's it. Computer doesn't see the network. Network doesn't see the computer. I don't know how a tester would help, since I can visually see the lines. I guess either my jacks are crap, or I'm wiring stuff wrong... anyone? Also thanks to Nate's suggestion, I put up pictures of one of them at http://www.yaron.org/pic/jack/ -Yaron --