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From: aurie@rhea.trl.oz ( Radio and Satellite Networks)
Newsgroups: comp.dcom.lans,aus.mac,aus.computers
Subject: Re: How to Break your Cheapernet - bad Tee pieces
Keywords: BNC Tee Ethernet Cheapernet EtherTalk
Message-ID: <618@rhea.trl.oz>
Date: 17 Jul 89 00:49:42 GMT
References: <335@wcc.oz>
Reply-To: aurie@rhea.trl.oz (Alistair Urie - Radio and Satellite Networks)
Organization: Telecom Research Labs.
Lines: 25

In article <335@wcc.oz> tom@wcc.oz (Tom Evans) writes:
>Your Cheapernet consists of cables and "Tee" pieces. If any cable or
>Tee piece goes bad, your net comes down (or gets sick).
>
>I bought four "Brand A" Tee pieces from an electronics store.
>The centre pin diameters varied. They consistently had one "tight"
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

One thing to note about BNC connectors is that there is TWO generic types
	75 ohm	- with thin centre pins
	50 ohm	- with thicker centre pins

(Its all a question of ratio of diameters - the higher the ratio and higher the
impedence)

If you use a 50 ohm female connector with a 75 ohm male then you don't get a 
very good connection the other way around is a bit more serious ( and is 
known in the trade as raping the connector)


-- 
Alistair URIE                                      Radio and Satellite Networks
Phone: 	+61 3 541 6370                            Telecom Research Laboratories
Fax: 	+61 3 543 3339                            770 Blackburn Rd. Clayton Vic
Mail:	aurie@rhea.trl.oz                                             AUSTRALIA