Path: utzoo!attcan!uunet!ogicse!uwm.edu!dogie.macc.wisc.edu!vms.macc.wisc.edu From: rsmith@vms.macc.wisc.edu (Rusty Smith, MACC) Newsgroups: comp.dcom.lans Subject: Re: 10BaseT && serial - don't try this at home kids Message-ID: <4100@dogie.macc.wisc.edu> Date: 26 Jul 90 15:55:09 GMT Sender: news@dogie.macc.wisc.edu Distribution: comp Organization: University of Wisconsin Academic Computing Center Lines: 28 In article , dpz@dimacs.rutgers.edu (David Paul Zimmerman) writes... >I've got a floor that is AT&T wired for 4 twisted pair to each office. That >includes my office. I needed to get two connections to my office, one serial >connection for my PC and one 10baseT for my Sun. It almost looked like I had >to do a new 4 pair run for the second connection, but decided to try a hack: stuff deleted >In the room, I took a 4 cubit length of flat 8 conductor (my standard >wall-to-computer cabling) and stripped off half the length of outside gray >plastic. On the intact end, I crimped a 8 conductor modular normally. On the >other end, I crimped 4 of the now-flailing wires normally for serial (3->3, >4->4, 5->5, 6->6). I then crimped the other four to reverse my 10baseT closet >hack (1->1, 2->2, 7->3, 8->6). It actually works, if you don't mind looking You may find problems with the flat gray cable. It is not twisted for 10 baseT . We are using Cabletron Equipment and 4 twisted pairs to each office also. When we also need RS232 serial connections we just put a splitter at the office RJ45. The first 2 pairs go to one side, the next 2 pairs the other side of the splitter. Then connect twisted pair interface cables for 10baseT and flat grey to a DB25 modular adapter for the RS232. Radio Shack lists duplex splitters for $4.95, we get them from our supplier for $1.80. This may help as your network grows. Rusty Smith Internet: rsmith@vms.macc.wisc.edu MACC Data Communications Bitnet: rsmith@wiscmacc (608) 263-6307 Univ. of Wisconsin @ Madison