Subject: Re: Interference from power lines
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
X-Newsreader: Forte Agent 1.91/32.564
Date: Mon, 06 Jan 2003 15:37:28 GMT
NNTP-Posting-Date: Mon, 06 Jan 2003 10:37:28 EST
On Mon, 6 Jan 2003 09:55:39 -0500, "Charles Perry"
>Actually you can get into potential (the voltage kind) problems across
Yes. AC power networks. Hard connected phone networks. but NOT
ethernet LANs of recent (post 2MB/s) make.
> We have investigated several cases where improper grounding and
>improperly applied surge protectors have caused data errors and even
I'd say that most, if not all were introduced through the power
> They make a surge protectors that includes plugs for
>network, telephone, etc, as well as power. These equalize the potential of
>these networks during a surge.
You will NOT find IT professionals using the devices *they* make.
Those that do aren't all that bright, spending their firm's cash on
non essential hardware. Just because Belkin makes it, doesn't mean
that it anything more than a consumer item.
Our telephone system is digital as well, and no part of it, short of
the main control panel *input* is susceptible to line surges or
spikes... at all. That input is even protected.
The AC power fed into any critical PCs should enter via a UPS, and
they have integrated surge protection as a part of their very nature.
So, I see no need for such devices in the business realm. For non UPS
connected PCs, one can simply use the AC line type suppressors. There
is no need for the multi style.
The data losses you refer to were very much most likely introduced
through the AC line, not the network wiring. It is even difficult to
pass magnetic pulses into a network line. Since the ports are
isolated at BOTH the NIC on the PC, as well as from the other ports,
and the switch, router, or hub, with the hub being the least
protected, as well as the least used in real networks. Larger hubs
that are for business are protected. The vulnerable ones I refer to
would be the cheap chinese, PC store, 4 port variety.