This is Followup-to-Who-Has-One? in view mode; [Up]
Date: Sun 21-Dec-1988 19:36:31 From: Unknown Subject: Re: Followup to Who Has One? The simple, cheap solution to connecting thin to thick Ethernet is just to get the appropriate connector hardware. Thick Ethernet uses what are called "UHF" connectors, and thin Ethernet uses "BNC connectors." Adapters are available for under $10. See a Newark, Zack, or Arrow catalog for details. I've actually used such conversions, and couldn't see an impedance mismatch at the connector when examining the cabling with a TDR. Sharp bends (4" radius) in the thick Ethernet cable cause more reflections than a thick/thin transition. Remember how you hook it up. BNC T-connector on the back of the machine, two thin Ethernet cables to the place where you reach the big cable, two adapters to convert to thick Ethernet. Never put a section of thin Ethernet between the machine and the T-connector; the short arm of the T can't be more than a few inches before everything stops working due to reflections. John Nagle >From: kchen@Apple.COM (Kok Chen)
Date: Sun 22-Dec-1988 02:31:10 From: Unknown Subject: Re: Followup to Who Has One? In article <17916@glacier.STANFORD.EDU> jbn@glacier.UUCP (John B. Nagle) writes: > The simple, cheap solution to connecting thin to thick Ethernet is >just to get the appropriate connector hardware. Thick Ethernet uses what >are called "UHF" connectors, and thin Ethernet uses "BNC connectors." >Adapters are available for under $10. See a Newark, Zack, or Arrow >catalog for details. No, no. You want to use a "Type-N" connector, not a "UHF connector" for thick Ethernet. There IS such a thing called the "UHF connector," but that is NOT what you will find normally used on Ethernets. Those ancient enough may remember using the Tektronix 503 oscilloscope in undergrad labs (they were popular in the '60's). THOSE animals used UHF connectors. A "type-N" is VERY different, and definitely will not mate with a UHF type. Kok Chen {decwrl,sun}!apple!kchen Apple Computer, Inc. P.S. Someone (a Harvard prof., no less [but Physics, not EE :-) ] ) once claimed to me that BNC (the connector used in thin-Ethernets) stood for "Baby N-Connector." Said person is also author of the "The Art of Electronics" book you see in bookstores and once (40+ years ago :-) held the record for being the youngest amateur radio operator in W-land, so he may be right. (I doubt it, Paul :-) :-)) >From: gore@eecs.nwu.edu (Jacob Gore)
Date: Sun 22-Dec-1988 04:02:26 From: Unknown Subject: Re: Followup to Who Has One? / comp.sys.next / jbn@glacier.STANFORD.EDU (John B. Nagle) / Dec 21, 1988 / >BNC T-connector on the back of the >machine, two thin Ethernet cables to the place where you reach the big >cable, two adapters to convert to thick Ethernet. Just to make sure I understand you correctly: are you actually splicing a piece of thin Ethernet into a thick Ethernet? Jacob Gore Gore@EECS.NWU.Edu Northwestern Univ., EECS Dept. {oddjob,gargoyle,att}!nucsrl!gore >From: jbn@glacier.STANFORD.EDU (John B. Nagle)
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