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Hetzner subsea fibre cut outage

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Re: Hetzner subsea fibre cut outage

#71
post #54

Earlier quoted context omitted.

Neither, it's shared ownership. It's similar to if you buy a house with your partner: neither of you owns specific rooms, but you own the whole thing together. There's likely agreements about which fibers (there's 8 fiber pairs in the cable) and/or how much bandwidth everyone can use, though.

Why only 8? Why don't they put like 100 in there?

They didn't need 500+ terabits?

Re: Hetzner subsea fibre cut outage

#72
post #30

Earlier quoted context omitted.

> Bitten by a shark, or snagged on a russian submarine? In all likelihood much less interesting, probably snagged in a fishing net or hit by an anchor.

I imagined they would be hurried under the sea bed. Probably cheaper to place them on the surface?

I imagined it'd too impractical to bury them in case they need repairs, but apparently they're buried at least in some cases.

According to [1], a plough is dragged along the ocean floor behind the cable laying ship. The plough digs a trench that the cables are fed into. I can't really tell from the pictures whether the trench is covered back up.

[2] shows a really cool animation. Apparently ploughs like these can bury cables 2-3 meters into the ocean floor, and use a jet of water to help dig. Good stuff.

1: https://www.quora.com/How-are-major-undersea-cables-laid-in-... 2: https://www.youtube.com/watch?v=9hEDTRU_F2s

Re: Hetzner subsea fibre cut outage

#73

Earlier quoted context omitted.

> Bitten by a shark, or snagged on a russian submarine? In all likelihood much less interesting, probably snagged in a fishing net or hit by an anchor.

Can’t rule out Russian military dolphins these days. https://www.theguardian.com/world/2022/apr/27/russia-black-s...

>Russian

>these days

https://en.wikipedia.org/wiki/Military_marine_mammal

Re: Hetzner subsea fibre cut outage

#74

Can they somehow tell exactly where the cable was cut?

Yes, using an OTDR [0].

These used to be big, expensive, standalone devices (I'd occasionally use one in a previous job). Nowadays, there are portable, handheld units specifically for identifying where a break has occurred and the same, basic functionality is often even built into the gear used at either end of connections (e.g., even the "enterprise" switches -- from Brocade and Cisco -- that I use at home).

---

[0]: https://en.wikipedia.org/wiki/Optical_time-domain_reflectome...

Re: Hetzner subsea fibre cut outage

#75

Earlier quoted context omitted.

They are a co-investor... so its partially their cable.

And as I'm an EU citizen paying top taxes, plenty of which went into funding the project, it's partially my cable as well.

By that logic (that it's not (partially) Hetzner's I mean, not the sarcasm) it's nobody's cable then?

Re: Hetzner subsea fibre cut outage

#76
post #4

Bitten by a shark, or snagged on a russian submarine? Whichever the case, I just ran an ansible deployment over our cluster that's spread over their Frankfurt and Helsinki datacenters, and I didn't notice any difference. I guess that's to be expected, their line between those datacenters is just an optimization, the internet is still functioning as it always is and maybe Hetzner gets a slightly larger egress bill fro…

There are not many sharks that can bite cables in the Baltic see due to low salinity, it's border-line freshwater.

Re: Hetzner subsea fibre cut outage

#77

Earlier quoted context omitted.

You find the ends, pick them up, and there's a kit that can fuse the ends to your new piece. I'm not sure about the details, but I think there are repeaters on the wire that need to be added as well.

Do they just fuse any strand to any strand and resort everything at the end or?

Strands in a bundle would likely have color coded sheaths. As long as you're not colorblind, it's pretty straightforward matching what gets spliced where.

Re: Hetzner subsea fibre cut outage

#78
post #36

Earlier quoted context omitted.

As Hetzner is a co-investor in the cable, it is partially their cable.

So do they own a solid chunk of it somewhere, or like a really long pie-slice sliver down the whole thing?

Most submarine cables are consortiums. A very recent consortium for example is SEA-ME-WE 6:

https://www.submarinenetworks.com/en/systems/asia-europe-afr...

Re: Hetzner subsea fibre cut outage

#80

Earlier quoted context omitted.

You find the ends, pick them up, and there's a kit that can fuse the ends to your new piece. I'm not sure about the details, but I think there are repeaters on the wire that need to be added as well.

Do they just fuse any strand to any strand and resort everything at the end or?

For submarine cables, there aren't that many strands, so getting it right is probably worth it, for terrestrial fiber, there may be 100+ strands, so they usually can sort things out at the ends, and I think you just fuse any strand to any strand. Sometimes, only some strands break and you can reallocate strands by priority until the cable can be fixed.
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