>From: Charles Gallo <Charlie@TheGallos.com>
>Sent: May 30, 2008 2:22 AM
>To: towertalk <firstname.lastname@example.org>
>Subject: Re: [TowerTalk] my long lightning story (was RE: lightning strike)
>On 5/30/2008 Roger (K8RI) wrote:
>> According to the NWS literature a strike a mile away can induce voltages
>> as high as a 1000 volts per meter in a piece of wire.
Lots of qualifiers there: "can induce" and "as high as", but, the risk is real,
although the vast majority of strikes a mile away won't do anything more than
give you a burst of static in your radio.
I would guess that the vast majority of lightning damage occurs from lightning
striking a utility service of some sort (power line, phone, cable tv), and the
impulse propagating into a home that way. No real backup for the statement, by
the way, just the impression I get from the literature in general.
>One interesting item of note, and this article is making me "think" (a bad
>This weekend I got a tour of a USCG Cutter (The Katherine Walker WLM 552), and
>something I noticed when we walked past the LAN room - they are NOT using
>100BaseT LANs, but everything is fibre optics
That's for a lot of reasons. EMP is one, and just general EMI/EMC issues as
>I wonder if fibre (which, interestingly is mostly "the past" in LAN design, as
>gigabit baseT is around) would be the/A future way to deal with our gear.
>Think - no ground loop potential, no voltage surge potential etc. Not cheap,
>by a long shot, but...
Fiber is wonderful. Even the inexpensive plastic stuff (used in stereo
equipment, for instance) gives you all the benefit.
Copper will have a long life for networks, because the infrastructure already
exists. However, there's an awful lot of fiber being put in for backbone links
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