Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!henry From: henry@utzoo.UUCP (Henry Spencer) Newsgroups: net.dcom,net.periphs,net.news Subject: 9600 full-duplex, by trickery? Message-ID: <4468@utzoo.UUCP> Date: Mon, 15-Oct-84 17:44:35 EDT Article-I.D.: utzoo.4468 Posted: Mon Oct 15 17:44:35 1984 Date-Received: Mon, 15-Oct-84 17:44:35 EDT Organization: U of Toronto Zoology Lines: 22 A recent issue of Electronics Week has a very interesting ad on the back cover. It's from Universal Data Systems (Motorola's modem subsidiary), and what it plugs is a UDS 9600 A/B -- a fairly ordinary 9600-baud half- duplex modem -- plus an "EC100" box which does error correction *and* makes the half-duplex modem look full-duplex! Does anybody know how well this thing works? I assume that the EC100, error-correction functions aside, is basically just some buffering and an intelligent line-turnaround algorithm. If one assumes that total average traffic, both directions together, is somewhat under 960 cps, then making a half-duplex channel look full-duplex is indeed feasible. They're pushing it for terminals, where the assumption is plausible, but it might work well enough for things like uucp. They say "for details, phone (800)633-2252 x356". Unfortunately, when I try this I get an error message from the phone company. (Probably because there's this international border in between...) Anyone ever heard of this widget, or worked with one? -- Henry Spencer @ U of Toronto Zoology {allegra,ihnp4,linus,decvax}!utzoo!henry