jra@lawday.Dayton.NCR.COM (John.Ackermann@Dayton.NCR.COM) (10/01/90)
I'm trying to put together a very simple ethernet between a unix system and one
(later two) pc. The ethernet card for the pc has a BNC coax connector, while
the card for the unix box (NCR Tower) has a 15 pin db connector.
What's the simplest/cheapest way to get these two cards to interconnect? The
distances involved are short... maybe 50 feet maximum.
--
John R. Ackermann, Jr. (513) 445-2966
Law Department, NCR Corporation VoicePlus 622-2966
Dayton, Ohio John.Ackermann@Dayton.NCR.COM
***** Amateur Radio: ag9v@n8acv or ag9v@ag9v.AMPR.ORG *****steve@grian.cps.altadena.ca.us (Steve Mitchell) (10/02/90)
jra@lawday.Dayton.NCR.COM (John.Ackermann@Dayton.NCR.COM) writes: >I'm trying to put together a very simple ethernet between a unix >system and one (later two) pc. The ethernet card for the pc has a >BNC coax connector, while the card for the unix box (NCR Tower) has a >15 pin db connector. >What's the simplest/cheapest way to get these two cards to interconnect? The >distances involved are short... maybe 50 feet maximum. The easiest and least expensive way to connect these systems is to go out and get one of the new miniature ethernet transceivers, plug it into the db-15 drop-cable connector, then run coax to the PC. The new tranceivers are about the size of a DB connector shell, and run about $200. The tranceiver runs off the db-15, so it's a tidy installation. The coax is ThinNet, cable type RG-58A/U. Just make sure you're terminated at both ends! I saw a review of a couple of brands of these miniature tranceivers recently, I believe in the September DEC Professional. Good luck. -- - Steve Mitchell steve@cps.altadena.ca.us grian!steve@elroy.jpl.nasa.gov ames!elroy!grian!steve "God is licht, an in him there is nae mirkness ava." -- 1 John 1:5
oberman@rogue.llnl.gov (10/02/90)
In article <1990Oct2.053859.15305@grian.cps.altadena.ca.us>, steve@grian.cps.altadena.ca.us (Steve Mitchell) writes: > $200. The tranceiver runs off the db-15, so it's a tidy installation. > The coax is ThinNet, cable type RG-58A/U. Just make sure you're > terminated at both ends! I saw a review of a couple of brands of One minor correction: The cable should be RG-58C/U. A/U is not quite withing the 10base2 spec. I believe it's off by about 2 ohms. A/U is also usually hard to find. While the A/U cable would almost certainly work, I suggest that you start with the correct cable since it's just as easy. R. Kevin Oberman Lawrence Livermore National Laboratory Internet: oberman@icdc.llnl.gov (415) 422-6955 Disclaimer: Don't take this too seriously. I just like to improve my typing and probably don't really know anything useful about anything.
spurgeon@.uucp (Charles E. Spurgeon) (10/03/90)
In article <1990Oct2.080310.1@rogue.llnl.gov> oberman@rogue.llnl.gov writes: >In article <1990Oct2.053859.15305@grian.cps.altadena.ca.us>, steve@grian.cps.altadena.ca.us (Steve Mitchell) writes: >> $200. The tranceiver runs off the db-15, so it's a tidy installation. >> The coax is ThinNet, cable type RG-58A/U. Just make sure you're >> terminated at both ends! I saw a review of a couple of brands of > >One minor correction: The cable should be RG-58C/U. A/U is not quite withing >the 10base2 spec. I believe it's off by about 2 ohms. A/U is also usually hard >to find. > >While the A/U cable would almost certainly work, I suggest that you start with >the correct cable since it's just as easy. > The 802.3a specs for the Type 10BASE2 thin Ethernet system note that the coaxial cable parameters listed in the specs "... are met by cable types RG58A/U or RG58 C/U." (section 10.5.1.6 on page 36 in my old green book supplement to the 802.3 standard.) The Belden Wire and Cable Co. catalog (1-800-BELDEN-1 to request a copy) shows that the RG-58A/U and RG-58C/U cables that Belden lists are all 50 ohm impedance. There are some RG-58/U cables shown on the same page, and the RG-58/U type cables are 53.5 ohm impedance. They would not make acceptable thin Ethernet cables. Ethernet relies on the detection of precise DC voltages for operation, and the use of incorrect impedance cables can cause problems. For 10BASE2 networks Belden recommends their Belden 9907 and 89907 (plenum version) cables. These cables have better propagation times than the older RG-58A/U and C/U cables. However, they appear to have a smaller outside diameter, so if you use their cable you'd need to make sure than any BNC connectors you buy will fit on the smaller OD. Charles E. Spurgeon Network Grenade Juggling Dept. | spurgeon@emx.utexas.edu | University of Texas at Austin | ...!cs.utexas.edu!ut-emx!spurgeon| ------------------------------------------------------------------------- Charles E. Spurgeon Network Grenade Juggling Dept. | spurgeon@emx.utexas.edu | University of Texas at Austin | ...!cs.utexas.edu!ut-emx!spurgeon| -------------------------------------------------------------------------
marshall@wind55.seri.gov (Marshall L. Buhl) (10/03/90)
steve@grian.cps.altadena.ca.us (Steve Mitchell) writes: >jra@lawday.Dayton.NCR.COM (John.Ackermann@Dayton.NCR.COM) writes: >>I'm trying to put together a very simple ethernet between a unix >>system and one (later two) pc. The ethernet card for the pc has a >>BNC coax connector, while the card for the unix box (NCR Tower) has a >>15 pin db connector. >>What's the simplest/cheapest way to get these two cards to interconnect? The >>distances involved are short... maybe 50 feet maximum. >The easiest and least expensive way to connect these systems is to go >out and get one of the new miniature ethernet transceivers, plug it >into the db-15 drop-cable connector, then run coax to the PC. The new >tranceivers are about the size of a DB connector shell, and run about >$200. The tranceiver runs off the db-15, so it's a tidy installation. I just got an InterLAN U3-NT-1000 for $122 from Random Access. It's a little bigger than a pack of cigarettes. Haven't tried it yet though. -- Marshall L. Buhl, Jr. EMAIL: marshall@seri.gov Senior Computer Missionary VOICE: (303)231-1014 Wind Research Branch 1617 Cole Blvd., Golden, CO 80401-3393 Solar Energy Research Institute Solar - safe energy for a healthy future
zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) (10/03/90)
Can someone post phone numbers for sources of low cost transcievers, etc? -- Jon Zeeff (NIC handle JZ) zeeff@b-tech.ann-arbor.mi.us
ferg@88opensi.UUCP (John Ferguson) (10/04/90)
In article <N!Y*G#*@b-tech.uucp> zeeff@b-tech.ann-arbor.mi.us (Jon Zeeff) writes: >Can someone post phone numbers for sources of low cost transcievers, etc? > >-- >Jon Zeeff (NIC handle JZ) zeeff@b-tech.ann-arbor.mi.us I have been buying transceivers (Allied Telesis) and cables from: Zack Electronics 348 Montague Expressway Milpitas, CA 95035 FAX: (408) 942-8257 Voice: (408) 942-5432 (ask for Dan Miranda) They give me much better prices and service than someone like Inmac or Black Box. They are focused on expanding their networking products business, so they are willing to do what it takes to make you a happy customer. I am in no way affiliated with Zack (or anyone who works there) -- simply a satisfied customer. ferg
alan@curly.Viewlogic.COM (Alan Medsker) (10/05/90)
MiLAN Technology 415-968-9000 -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Alan Medsker Viewlogic Systems, Inc. Voice: (508) 480-0881 293 Boston Post Road West Fax: (508) 480-0882 Marlboro, MA 01752 Internet: amedsker@Viewlogic.COM cc:Mail: Alan Medsker at Viewlogic CI$: 76376,662 BIX: amedsker 2 Meters: WB0SQR =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= My opinions, of course. And don't hold me to them. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
haas%basset.utah.edu@cs.utah.edu (Walt Haas) (10/05/90)
e use the model 2010K transceivers from: TCL Incorporated 41829 Albrae Street Fremont, CA 94538 Voice: 415-657-3800 FAX: 415-490-5814 Specify thicknet vampire or thinnet BNC. They also give us a good price on tranceiver drop cables. Their 2310 multiport transceiver is not only cheap, it also has an (extra cost) rack mount kit that is nice and each port has an individual SQE enable/disable switch. -- Walt Haas