Newsgroups: comp.dcom.lans
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!hellgate.utah.edu!cs.utah.edu!zeleznik
From: zeleznik@cs.utah.edu (Mike Zeleznik)
Subject: Re: 10BaseT installation
Date: 5 Apr 91 10:58:03 MST
Message-ID: <1991Apr5.105804.24270@hellgate.utah.edu>
Organization: University of Utah CS Dept
References: <5438@durin.sparta.COM> <14069@darkstar.ucsc.edu> <821@hwsw.gedas.de>

In article <821@hwsw.gedas.de> rainer@hwsw.gedas.de (Rainer Raupach) writes:
>(stuff deleted)
>
>|>      As to why 10BASE-T uses an RJ-45, I know of a couple of reasons, but I
>|>      ...
>|>                               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

Are they using the extra pins to remotely control these features of the
transceiver?  Otherwise, I don't see the need for more lines/pins.

I thought that link integrity is handled simply by transmitting a
low-duty-cycle pulse on the xmit pair when there is no other activity, and
seeing if it comes back on the receive pair.  This would not require any
additional lines/pins.

The SQE signal, and the integrity test of its line, occur on the other side
of the transceiver, so how would this require more lines/pins on the
physical network?

Mike

  Michael Zeleznik    zeleznik@cs.utah.edu    801-581-5617