Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site im4u.UUCP Path: utzoo!watmath!clyde!burl!ulysses!gatech!ut-sally!im4u!jsq From: jsq@im4u.UUCP (John Quarterman) Newsgroups: net.periphs,net.news,net.lan Subject: Re: 2400 (or higher) baud modems (1 of 4) Message-ID: <667@im4u.UUCP> Date: Sun, 24-Nov-85 14:52:43 EST Article-I.D.: im4u.667 Posted: Sun Nov 24 14:52:43 1985 Date-Received: Tue, 3-Dec-85 20:21:55 EST References: <632@im4u.UUCP> Reply-To: jsq@im4u.UUCP (John Quarterman) Organization: U. Texas CS Dept., Austin, Texas Lines: 159 Keywords: 2400 baud, modem Xref: watmath net.periphs:917 net.news:4459 net.lan:1174 >From: jsq@im4u.UUCP (John Quarterman) >This is a survey on 2400 baud or faster modems, as subject >which should be of interest to many, considering the increasing >traffic on both the UUCP and USENET networks, and the lessening >ability of a few sites to handle major parts of the load for the rest. This summary was prepared by Carol Kroll, who didn't realize beforehand what she was getting into. A couple of disclaimers to add to what she writes: The set of newsgroups being posted to here may or may not be appropriate. If not, sorry about that, but remember that at least B news only transfers one copy and uses links. Some of the responses arrived as inclusions inside responses from other people, as they had evidently been responses to earlier surveys. Due to time constraints, we have not been able to ask permission to post every such included letter, and have assumed that you wanted your letter public. On to Carol's summary. -jsq Our thanks to everyone who replied to this survey. It turns out that an information summary on these modems is already available, in an article by Brian Edwards in the October 1985 issue of Hardcopy (Vol. 14, No. 10). It includes an 8 page chart describing the interface, protocols, jacks, features, and price of over 60 different manufacturers' 2400 baud modems. There appear to be a few inaccuracies, but the list is certainly helpful. Missing from the Hardcopy list are the USR Courier 2400, CTS Datacomm 2424AD, and Electronics Vaults UPTA-96/S. Information on them follows. The CDS 224 is in the article, but the info Tim Radzykewycz sent is more complete, and is also appended. This is the first of four messages. The others are: (2) a reposting of a description of 2400 transmission protocol types and standards by Bob Cunningham of Hawaii Institute of Geophysics from May 85, (3) a summary of comments people sent about their experience with the USR Courier 2400, (4) summary of comments on other types of modems. Manufacturer USRobotics Distributor Tek-Aids 1400-A Smith Rd Austin, TX (512) 385-0590 Modem Courier 2400 Interface RS232 Price 440.00 Baud or bps 300/1200/2400 Protocols Bell103/Bell212A/CCITT V22.bis Housing Standalone Autodial? yes Asynchronous? yes Public switched tele. network? yes Warranty 2 years Other autobaud in answer mode Manufacturer CTS Datacomm (203) 743-3681, Pete Coccaro Distributor Hall-Mark Electronics 12211 Technology Blvd Austin, TX 78727 (512) 258-8848 Modem CTS-2424ADA (CTS-2424AD rackmount) Interface RS232 Price 315.00 (495.00) Baud or bps 300/1200/2400 Protocols Bell103/Bell212A/CCITT V22.bis Housing Standalone (card) Autodial? yes Asynchronous? yes Public switched tele. network? yes Warranty Other autobaud in answer mode 16-card rack is $795.00 stores 10 numbers >From: ut-sally!seismo!gould9!sdcc3!ucbvax!calma!radzy (Tim Radzykewycz) CDS: manufacturer: Concord Data Systems 303 Bear Hill Road Waltham, MA 02154 (617) 890-1394 telex 95-1793 distributor: We used: Electro-Data Marketing 552A Valley Way Milpitas, CA 95036 (408) 945-1300 available: currently model number: 224 Autodial Modem autodial: yes speeds: 1200/2400 synch/asynch: asynchronous housing: standalone price: $689 on 3/85 discounts: unknown compatibility: 2400: ccitt v.22bis 1200: bell 212 let me quote the manual here: ...conforms to the following recommendations: o EIA RS232, RS422 o CCITT V.24, V.28, V.54, V.22bis (at 2400bps) o ISO and IEC specifications relevant to data modems and interfaces o Bell 212A (1200bps mode only) use: These modems are only used for dial-in. Right now, we are receiving UUCP (from SUN) calls and interactive use from home. comments: 1. These modems do not have fuses. We recently had one die because of this. I returned it a week ago, and it is not back yet. 2. The command set is non-hayes compatible. This is not so good for uucp dial-out, but fine for dial-in. There were some requests out a while ago in net.wanted for uucp drivers for these beasts, but I didn't grab them. I think the command set is better than Hayes. ************************************************************ manufacturer: Electronic Vaults, Inc 12347-E Sunrise Valley Drive Reston, VA 22091 (703) 620-3900 distributor: direct from mfg available: currently model number: UPTA-96/S autodial: yes speeds: 4800/7200/9600 synch/asynch: asynchronous housing: standalone -- Also available in IBM-PC version. price: $995 on 8/85 ($895 for PC version) discounts: unknown compatibility: none use: We have one set up for dial-in on one of our machines, and the other is used from home for dial-in. We plan to test this out for uucp, but haven't done so yet. comments: 1. This is a half-duplex modem, and it takes a significant amount of time to switch transmission directions. This makes it somewhat poor for interactive use. 2. We've had some problems with keeping the lines up. Every once in a while, the modem I have at home will print the message "OK\nRING\n", and disconnect you. Electronic Vaults has sent me new ROMs, but I haven't yet installed them. 3. They are very reliable, except for the above problem. I have *never* gotten a "noise" character with these. -- John Quarterman, UUCP: {ihnp4,seismo,harvard,gatech}!ut-sally!im4u!jsq ARPA Internet and CSNET: jsq@im4u.UTEXAS.EDU, formerly jsq@im4u.ARPA