Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site ulysses.UUCP Path: utzoo!linus!decvax!genrad!wjh12!foxvax1!brunix!ulysses!smb From: smb@ulysses.UUCP (Steven Bellovin) Newsgroups: net.dcom Subject: Re: 56Kbit telephone lines? Message-ID: <771@ulysses.UUCP> Date: Sat, 11-Feb-84 16:58:39 EST Article-I.D.: ulysses.771 Posted: Sat Feb 11 16:58:39 1984 Date-Received: Tue, 14-Feb-84 01:03:53 EST References: <2174@hplabs.UUCP> Organization: AT&T Bell Laboratories, Murray Hill Lines: 37 From: piety@hplabs.UUCP (Bob Piety) Newsgroups: net.dcom Subject: 56Kbit telephone lines? Message-ID: <2174@hplabs.UUCP> Date: Thu, 2-Feb-84 14:43:40 EST It seems that I've heard something about the telephone company (ies) offereing a 56K bit digital service. Has anyone heard anything about it? Is it true? Available? When? Cost? Restrictions? Thanks in advance for your replies. Bob Yup, it's true. You're referring to CSDC (Circuit-Switched Digital Capa- bility); it's 56Kb *dial-up* synchronous (and can also run at 9.6Kb, I think). It will be available only at central offices that install some extra hardware and new software for their ESS. At the customer end, there's some box that takes the place of a modem. You can use the phone for voice or data calls; the data calls must be preceeded by a special prefix. As for availability -- to the best of my knowledge, the service has not yet been tarriffed. There are a few experimental installations in progress, in (I think) Georgia, Florida, and N.J. The real gotcha is that the service is syncronous. There are protocol converters available (for a few hundred dollars), but they don't go that fast. On the other hand, there hasn't been a market until now. I'm following this closely, because I'd like to have such a line to my house.... --Steve Bellovin AT&T Bell Laboratories P.S. I make no warranties as to the accuracy or reliability of the above information. It's my perception of reality, and has nothing to do with any official policies of my employer.