The NZ Linux Resource
From: Nic Bellamy (nic@bellamy.co.nz)
Date: Mon 28 Jul 2003 - 14:16:21 NZST


On Mon, 2003-07-28 at 13:52, Vik Olliver wrote:
> On Mon, 2003-07-28 at 12:36, Stephen Cope wrote:
> > http://www.linux.net.nz/lists/NZLUG/2003/01/0115.html
> 
> That's well within the isolation specifications of Ethernet.

Indeed, providing you trust the chap in who knows where that designed
it, and the other chaps who knows where else that manufactured the
isolating transformer and board.

In the particular case linked above, the problem came to light as I was
feeding audio from a computer plugged into socket #1 to an amp plugged
into socket #2. 120VAC is enough to give you quite a reasonable tingle.

I must admin I am placing a bit of trust in a couple of cards at the
moment; there's a network cable in a shallow trench between my place and
my neighbors - so far, no problems, and it's only about a 30m run.
LAN-speed WolfET. This way, I can't blame connection speed for the fact
that I seriously suck at it :-)

Other options I looked at were free-space optical (FSO) and wireless,
but decided to risk it. If I was going much further, I'd definitely look
at something with better isolation.

FYI all: I still consider this thread to be reasonably on-topic, as it
(a) related to networking computers together, and (b) is something done
by many here. If we start getting down and dirty with electronic
engineering guff then perhaps it'll be time for us to shut up :-)

Regards,
	Nic.

-- 
Nic Bellamy <nic@bellamy.co.nz>
Bellamy Consulting (NZ) Limited. +64-6-377-4957 Mobile: +64-21-251-8954
Internet Software & Security Consulting -- http://www.bellamy.co.nz/ --

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