Andy.Linton@comp.vuw.ac.nz (Andy Linton) (08/01/90)
It seems likely that our new Computer Science building will be cabled using AT&T SYSTIMAX Premises Distribution System (PDS). I'd be interested in any general comments people may have about the system. Eventually we'd like to use it to provide 10BaseT support into offices but we have still a number of Unix workstations which uses 10Base2 and 10Base5 e.g. HP300, HP800, Sun, NCD X-terminal plus PC's and Mac's. This raises two points: 1) Suggestions of good and bad converter devices from 10Base[25] to 10BaseT would be welcome. Approximate prices would be useful. 2) And for the future, who is going to support 10BaseT on Unix workstations etc? Thanks andy
bolland@mdcbbs.com (09/01/90)
An excellent Article on the EtherSwitch can be found in Data Communications International (August Issue) pp67-71 It is written by Vinod Bhardwaj - Principal Scientist at Kalpana
gehallert@amherst.bitnet (09/14/90)
In article <1990Aug29.153353.13564@math.lsa.umich.edu>, nelson@sun.soe.clarkson.edu (Russ Nelson) writes: > Archive-name: clarkson-packet-drivers/29-Aug-90 > Original-posting-by: nelson@sun.soe.clarkson.edu (Russ Nelson) > Original-subject: Clarkson packet drivers 7.x now available > Archive-site: sun.soe.clarkson.edu [128.153.12.3] > Archive-directory: /pub/ka9q > Reposted-by: emv@math.lsa.umich.edu (Edward Vielmetti) > > The 7.x release of the Clarkson collection of packet drivers is now > available. The summary is given below. In addition to the new > drivers and bug fixes, a switch has been added that lets you use > Novell without econfiging your server. > > Summary: > New drivers: UB PC/NIC, LocalTalk, Tiara, NTI. > Bugs fixed: 3c505, 3c503, wd8003e, nb, ne1000. > Bug found but not fixed: 3c523. > > The packet drivers are for MS-DOS, and serve to hide the difference between > network cards, and allow multiple protocol stacks to access the same card. > Most often people are interested in running Novell's Netware and TCP/IP > at the same time. > > The Clarkson packet driver collection > > Availability > > The Clarkson collection of packet drivers is available by FTP, by > archive-server, and by modem. They come in two flavors -- executables > only (drivers.arc), and source+executables (driverss.arc). All of the > following instructions apply to both drivers.arc and driverss.arc. > > Mail: > > I distribute the packet drivers on a 1.2 MB 5.25" disk, or a 720K 3.5" > disk. You can send me a check for $20, or you can send me a purchse > order and I will bill you for $22. NY residents add 7% sales tax, > overseas orders add $3 for shipping. If you send a check, please be > sure it is in US dollars -- the bank charges me $15 to convert checks > drawn in foreign currencies. > > Russell Nelson > 11 Grant St. > Potsdam, NY 13676 > > FTP: > > sun.soe.clarkson.edu:/pub/ka9q/drivers.arc > grape.ecs.clarkson.edu:/e/tcpip/drivers.arc > > Archive-server: > > Send mail to archive-server@sun.soe.clarkson.edu and put the following > command as the body of your message: > help > This will send you a help message. Reading this help message will tell > you how to fetch the packet drivers. > > Modem: > > Call the Clarkson Heath User's Group's BBS: (315)268-6667, 8N1, > 1200/2400 Baud, 24 hours. Change to file area 24 and download drivers.arc. > > -- > --russ (nelson@clutx [.bitnet | .clarkson.edu]) Russ.Nelson@$315.268.6667 > We won the cold war. The Russians spent trillions defending their stuff, > then they found that they didn't have any stuff. Will we avoid the same trap?
00bestrawser@bsu-ucs.uucp (Wichmachtendienk, Wigolauchsik, Witahemui.....) (10/31/90)
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leonard@arizona.edu (Aaron Leonard) (11/09/90)
In article <1522@ariadne.csi.forth.GR>, nicolas@csi.forth.gr (Nicolas Chrissakis) writes: > > I have the following situation: > > |=========================| <-----Ethernet 802.3 > |||| > |||| > |||| <------- 4 wires (600 meters) under a road. > |||| > |||| > |========================| <-----Ethernet 802.3 > > I will like to connect the 2 Ethernet segments with these 4 wires. > I can not put a repeater in the middle of the road and I want to have a > 10 Mbit/sec connection. In such situations, we'll drive the line as a T1 circuit and hook up the Ethernets via bridge/routers, thus: |=========================| <-----Ethernet 802.3 | <---------------AUI cable [bridge] I <---------------V.35 cable [ld] <---------------T1 line driver |||| |||| <------- 4 wires (600 meters) under a road. |||| [ld] <---------------T1 line driver I <---------------V.35 cable [bridge] | <---------------AUI cable |========================| <-----Ethernet 802.3 You can use T1 CSU/DSUs, but on private copper the T1 line drivers are smaller and cheaper. (We use units from Teleprocessing Products.) They can drive the line at speeds ranging from fractional T1 (384Kb I think) on up to a full 2.048MBps. You can use bridges or routers to connect the T1 circuit up to the Ethernet. Bridges are cheaper; we like cisco brouters for their flexibility. The whole thing ain't cheap; our cost (and we get big discounts) runs to about $10000 for such a hookup. But it works fine. Aaron Aaron Leonard (AL104), <Leonard@Arizona.EDU> University of Arizona Telecommunications, Tucson AZ 85721
bruce@ccavax.camb.com (11/11/90)
In article <1522@ariadne.csi.forth.GR>, nicolas@csi.forth.gr (Nicolas Chrissakis) writes: > |||| > |||| <------- 4 wires (600 meters) under a road. > |||| > |||| > I will like to connect the 2 Ethernet segments with these 4 wires. > > Any suggestions? > I do not want to put a baseband modem at 128 Kbits/sec to have a connection. If the twisted pairs are suitable, a vanilla T1 ckt at 1.544mhz could go over that. In Europe you folks use something near 2.048, but I don't know about the cable driving. Here we get about 6000 feet between repeaters. We also use T1C that is 2 x T1, but there are near end crosstalk problems where your 2 pairs would get in trouble near each end (ear in mouth disease). You then need a vanilla remote bridge or possibly router pair. Since your distance is so short compared to 6000', that maybe you can find something less common to drive them nearer 10mhz. Good luck.
yyelba@lims03.lerc.nasa.gov (ELBA GUERRIDO) (03/28/91)
Subject: Want to procure a CD-ROM Server - recommendations requested. Date: 25 MAR 91 14:45:27 Expires: References: Sender: Reply-To: yyelba@lims03.lerc.nasa.gov Followup-To: Distribution: world Organization: NASA Lewis Research Center Keywords: News-Software: VAX/VMS VNEWS 1.3-4 We are planning on networking a CD-ROM Server. The communication protocols we are currently running are XNS and TCP/IP, and the network operating system is Ungermann-Bass NET/ONE . We currently have a six drive Pioneer CD-ROM Changer DRM-600 Laser Memory which was connected to the Ethernet and tested for three clients accessing simultaneously. The response time was roughly 10.8min. We would like a product that has a response of roughly 300msec for over 5000 users. Thanks in advance for any recommendations or information regarding this matter. ************************************************************************** Elba Guerrido * NASA LeRC * MS 142-1 * 21000 Brookpark Road * Evasiveness ought to be a sin!!! Cleveland, OH 44135 * *********************** 216-433-8276 * FAX #: 216-433-8000 * *************************************************************************
patrick@casbs.Stanford.EDU (Patrick Goebel) (04/05/91)
GMT Message-ID: <1991Apr4.145847@casbs.Stanford.EDU> Reply-To: patrick@casbs.Stanford.EDU (Patrick Goebel) Organization: Center for Advanced Study in the Behavioral Sciences Subject: Re: 10Base-T hubs Keywords: In article <1991Apr03.004515.12021@rs6000.cmp.ilstu.edu>, ejbehr@rs6000.cmp.ilstu.edu (Eric Behr) writes: We're considering using our twisted pair wires for Ethernet. Hence tons of |> questions, some of which are below: |> (Stuff deleted...) |> - has anyone had any experience with the passive 12-port hub from Asante? Nope, but since you are apparently on the verge of possibly purchasing some 10BaseT equipment, I thought I'd take the opportunity to share one of the few pleasant experiences I had when installing our own local area network. Last June we installed a 96-node 10BaseT LAN using two cascaded David Systems ExpressNet hubs distributed by Westech Communications Inc. The hubs were connected by way of their AUI ports using thinnet transceivers and coax and so we didn't lose any modular ports. The 10BaseT ports come in 12-port modules that slide easily in and out of the hub chasis. Each hub also has a "supervisor" module that provides all the network statistics you'd ever want through an RS-232 port. If SNMP is your dream, the module is or will be SNMP-upgradable by way of a simple PROM swap. David Systems was the only vendor at the time (pre-10BaseT ratification) who would guarantee IN WRITING that any modifications necessary to make their hubs 10BaseT compliant would be implemented on existing equipment free of charge. My first experience with David Systems was through Chuck Frey who hand-delivered a loaner hub and a few tranceivers that I used for a couple of weeks to try out communications between a couple of PCs and a Sun. Once I was satisfied with the performance and interoperability of the hub (I was using Western Digital 10BaseT cards in the PCs and a Cabletron 10BaseT transceiver on the Sun), our contact at Westech, Mark Stockford, personally delivered the equipment and spent two-hours at our site installing the boxes and verifying that everything was working as it should. As for repair service, in the past year I had one 12-port module start to behave erratically and had a new one delivered within 24 hours of my call. As someone who is continually disappointed with the general lack of compentency in the retail computer industry, the whole David Systems/Westech experience was extremely refreshing. Let me assure you that I have no connection with either company and was not in any way reimbursed for this note. If you're still in the market, I would highly recommend making a couple of phone calls: Chuck Frey: David Systems/Sunnyvale CA (408) 720-6828 Mark Stockford: Westech/Hayward CA (415) 887-8773 Good luck! -- R. Patrick Goebel E-MAIL: patrick@casbs.Stanford.EDU Network Administrator VOICE: (415) 321-2052 CASBS, 202 Junipero Serra Blvd. FAX: (415) 321-1192 Stanford, CA 94305 BEEPER: Temporarily Out of Order...