Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site watcgl.UUCP Path: utzoo!watmath!watcgl!dmmartindale From: dmmartindale@watcgl.UUCP (Dave Martindale) Newsgroups: net.unix-wizards Subject: Re: ethernet cable? Message-ID: <2279@watcgl.UUCP> Date: Mon, 19-Mar-84 16:33:37 EST Article-I.D.: watcgl.2279 Posted: Mon Mar 19 16:33:37 1984 Date-Received: Tue, 20-Mar-84 01:09:51 EST References: <4126@ukc.UUCP> Organization: U of Waterloo, Ontario Lines: 14 If you use anything other than "real ethernet cable", make sure that the transceiver physically attaches to it correctly before you buy it. Transceivers tend to bolt directly onto the cable, making their electrical connection through a drilled hole. A change in outside diameter of the cable, thickness of insulation, or diameter of inner conductor could cause a non-existent or poor connection. Also, the Ethernet specs say what the velocity factor and resistive losses of the cable should be to guarantee that the system will operate properly out to its distance limits. Either buy cable which is within the specs, or make SURE you understand how it will affect the network you can build. Finally, real ethernet cables have marks on them telling you where to install the transceivers so that the impedance discontinuities produced by the transceivers produce reflections which tend to cancel each other rather than adding. If you buy cable which isn't marked in this way, measure it for yourself.