nanog mailing list archives
Re: Protecting 1Gb Ethernet From Lightning Strikes
From: Nick Olsen <nick () floridavirtualsolutions com>
Date: Wed, 14 Aug 2019 13:54:47 -0400
This. Very little will protect you from a direct strike. Working for a WISP for a long time as a past life, I've seen radios physically split in half. Chunks of concrete taken out of walls near the equipment. Black ethernet ports that have functionally soldered themselves into the jack. Six figures worth of lost gear over the years (Does sound like much, But at ~$80 a pop for cheap wisp gear. That's a lot of equipment.) Outside of a direct strike, You can still melt gear left and right. The fix is no one solution, But multiple. 1. Shielded Ethernet with proper shielded and bonded ends. 2. Proper Grounding 3. Ethernet Surge Suppressors. 4. Proper Grounding. 5. Proper Grounding. The key is to make your sensitive electronic equipment a higher resistance path instead of your grounding system. You're going to get inductance build up on cables you just have to get it to ground through something that isn't your site switch/router. And it's going to get there one way or another. Sometimes this can be harder then one might think. Even considering sinking your own ground rod, And replacing it every few years. As a ground rod becomes less and less effective with every strike (Depending on what it's sunk in). Ethernet Surge Suppressors CAN help. But only in assisting in getting whatever was already on the cable to ground. And don't forget ground potential differences between different grounding systems. Doing the above will get you through most near by strikes. But all bets are off on direct strikes. The above can also help you with a ton of other interference. Like a giant FM transmitter running at 100KW a stones throw away from your equipment but that's another story for another thread. On Wed, Aug 14, 2019 at 1:34 PM Chris Knipe <savage () savage za org> wrote:
Think surge protectors will protect against strikes that is far away, and the residual surge it creates. A direct strike? Don't think there's anything that will really protect against that. On Wed, Aug 14, 2019 at 7:29 PM <bzs () theworld com> wrote:Are "surge protectors" really of much use against lightning? I suspect not, other than minor inductions tho perhaps some are specially designed for lightning. I wouldn't assume, I'd want to see the word "lightning" in the specs. I once had a lightning strike (at Harvard Chemistry), probably just an induction on a wire some idiot had strung between building roofs (I didn't even know it existed) and the board it was attached to's solder was melted and burned, impressive! More impressive was the board mostly worked, it was just doing some weird things which led me to inspect it...oops. My understanding was that the only real protection is an "air gap", which a piece of fiber will provide in essence, and even that better be designed for lightning as it can leap small gaps. Check your insurance, including the deductibles, keep spares on hand. P.S. My grandmother would tell a story about how what sounded like the ever-controversial "ball lightning" came into her home when she was young. Good luck with that! https://en.wikipedia.org/wiki/Ball_lightning -- -Barry Shein Software Tool & Die | bzs () TheWorld com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*-- Regards, Chris Knipe
Current thread:
- Re: Protecting 1Gb Ethernet From Lightning Strikes, (continued)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Warren Kumari (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Blake Hudson (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Brandon Martin (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Eric Kuhnke (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Rob Pickering (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Bill Woodcock (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Nate Burke (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes bzs (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Chris Knipe (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Mikael Abrahamsson (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Nick Olsen (Aug 15)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Warren Kumari (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Jared Mauch (Aug 13)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Bjørn Mork (Aug 14)
- Re: Protecting 1Gb Ethernet From Lightning Strikes Måns Nilsson (Aug 14)