Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!samsung!uunet!wang!wdr From: wdr@wang.com (William Ricker) Newsgroups: comp.dcom.lans Subject: Re: 50-75 ohm impedance matching Message-ID: Date: 19 Jul 90 22:46:23 GMT References: <8592@uhccux.uhcc.Hawaii.Edu> Organization: Wang Labs, Lowell MA, USA Lines: 43 I have seen here around Wang Towers some devices which balance ThinNet to run over pairs of old cables already installed. (The old Wang cabling I'm told is 75ohm, although I successfully used an extender of that cable as a splice-extension in the middle of a point-to-point ThinNet link, which should have created horrible reflections -- maybe ignored because the reflections were within 3m of both transceivers? Who knows.) The magic coverter would presumably also work with a single run of 75 ohm cable, with some sort of terminator. (Wang minicomputer customers cabled 75ohm pairs between workstation and computer room; now that they're replacing that net with PC's running 802.3, they want to run on the same wire. Since a thin-net is usually a loop, this works fine: do a star-shaped loop, patching each office's return to the next's feed at the patch-panel. The hard part is matching the impedenance and DC components, as previously pointed out in this thread. Allegedly, which cute little coverter cable with a WANG logo does this.) I've heard conflicting rumors whether we're selling these to paying customers or not; I can't find it in the catalogs, but then, I don't know where/how they'd index it if it was. To find out if you can order one, you can call either 800-225-0234 or 800-TEL-WANG, which is Wang Express, our direct-sales group, and ask about adapters to run Ethernet or 802.3 over "928 cables" or "old wang workstation cables". If they can't find it, and you want it, call me & I'll see if I can find they guy who told me what it was and get a number for you. Bill Ricker Applications Software (508)967-2663 No, Wang doesn't guarantee this information -- if we aren't selling 'em, I probably shouldn't suggest we could! So don't fink on me!-) -- /bill ricker/ wdr@wang.com a/k/a wricker@northeastern.edu *** Warning: This account not authorized to express opinions ***