Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!clyde!cbatt!ihnp4!houxm!mtuxo!qeds From: qeds@mtuxo.UUCP (e.schulz) Newsgroups: comp.dcom.modems Subject: Re: Pending FCC ruling threat to modem users Message-ID: <2357@mtuxo.UUCP> Date: Fri, 26-Dec-86 22:19:17 EST Article-I.D.: mtuxo.2357 Posted: Fri Dec 26 22:19:17 1986 Date-Received: Sat, 27-Dec-86 05:37:01 EST References: <1572@brl-adm.ARPA> <3454@curly.ucla-cs.UCLA.EDU> <403@pixar.UUCP> <1496@kitty.UUCP> Organization: AT&T Information Systems Labs, Holmdel NJ Lines: 23 Keywords: modems, bandwidth, carrier, TASI I was a member of the TASI-E development team at AT&T Bell Labs from 1979 to 1982, and can confirm that as far as I know, Larry Lippman's comments about TASI are correct. Advances in digital radio, fiber-optic cable, and other technologies keep driving the cost of long-distance facilities down; this keeps TASI from proving in domestically. There are at least two dozen TASI-E systems in use on undersea cable (last I heard), each with a capacity of about 240 conversations on 120 long-distance circuits. The front-end clipping of speech bursts is barely noticeable to the trained ear on TASI-E. How we achieved this and tested it in field trials is interesting, but not for comp.dcom.modems! TASI-E does detect the echo-suppressor disable tone at the start of a data call, and "pins up" the connection (does not do TASI) for the duration of that call. If overseas modem (and fax and music on hold) traffic exceeded 5% or so, the TASI advantage would be reduced, those routes would need to be re-engineered, and eventually overseas phone service would cost more. Not domestic service, though. -- Ed Schulz, AT&T Information Systems, Middletown, NJ (201)957-3899 {at&t}!solar!eds