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From: rainer@hwsw.gedas.de (Rainer Raupach)
Newsgroups: comp.dcom.lans
Subject: Re: 10BaseT installation
Message-ID: <821@hwsw.gedas.de>
Date: 4 Apr 91 11:16:39 GMT
Article-I.D.: hwsw.821
References: <5438@durin.sparta.COM> <14069@darkstar.ucsc.edu>
Sender: news@hwsw.gedas.de
Reply-To: rainer@hwsw.gedas.de (Rainer Raupach)
Organization: VW-GEDAS BERLIN
Lines: 23

(stuff deleted)

|>      As to why 10BASE-T uses an RJ-45, I know of a couple of reasons, but I
|>      don't know that any of them are "official."  First and most important,
|>      it's to keep people from plugging their phones into  data  jacks,  and
|>      vice  versa. Secondly, it's to allow for people in the future plugging
|>      their phones into data jacks, but making it work.   You'll  find  that
|>      ISDN normally uses pins 4, 5, 7, and 8.
|>                               
|>                              -Bill Woodcock
|>                               BMUG NetAdmin

Additional to these reasons, there are some more:
AT&T uses some more pins to include some other features, like
SQE-testing and link integrity testing. I really don't know, if 
those features are part of the 10 Base T - standard.

Rgds Rainer

---
Rainer Raupach		Internet: rainer@hwsw.gedas.de
Network Coordinator	X.400:	S=RAUPACH C=DE A=DBP P=VW-GEDAS
VW-GEDAS Berlin, GER 	Phone:	+49 30 39007-629  / FAX : ext -999