←back to thread

Hunting for North Korean Fiber Optic Cables

(nkinternet.com)
288 points Bezod | 4 comments | 08 Dec 25 16:38 UTC | HN request time: 0s | source
Show context
mikkupikku ◴[08 Dec 25 19:06 UTC] No.46196286[source]▶
Do those small utility boxes alongside the tracks make sense for fiber optic? I expected things like that to be larger, if only because fiber has a minimum bend radius.

Edit: Good article though, I enjoyed it a lot.

replies(3): >>46197862 #>>46197947 #>>46205494 #
adamcharnock ◴[08 Dec 25 21:26 UTC] No.46197862[source]▶
The min bend radius isn’t that large in my experience. On the order of 10cm IIRC, possibly even less.
replies(2): >>46197929 #>>46198131 #
1. Lukas_Skywalker ◴[08 Dec 25 21:49 UTC] No.46198131[source]▶
Even less is correct: outdoor fibers (G.652.D) have a minimum bend radius of about 30mm. The indoor counterpart (G.657.A1 and A2) have 10mm and 7.5mm.
replies(2): >>46201661 #>>46204093 #
2. lesuorac ◴[09 Dec 25 05:45 UTC] No.46201661[source]▶
Those are more of a technically no?

Like I have fiber to the house and you really need to pinch it and whatnot to cause an internet outage.

replies(1): >>46204975 #
3. eqvinox ◴[09 Dec 25 12:15 UTC] No.46204093[source]▶
The larger cables tend to have strength members with higher physical bend radius restrictions, i.e. you can't bend the steel or kevlar elements that tightly without breaking things.
4. oarsinsync ◴[09 Dec 25 13:58 UTC] No.46204975[source]▶
A small bend radius means it can have a tight bend.

A large bend radius means it has to be a big bend.

A 7.5mm bend radius is really small. You can bend that stuff pretty tight before you create a problem.