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If cable gets cut somewhere, how they find out where it happened?
by ioncube 6y ago
If cable gets cut somewhere, how they find out where it happened?
- thdrdt 6y agoI believe they use devices that act like some kind of radar. They send a signal across the wire and measure how long it takes to bounce back. They can get a really good estimation of the distance between the ping and the cut. But maybe others can explain how this works. Edit: this website explains other methods very well https://www.electricaltechnology.org/2015/06/cable-faults-how-to-locate-faults-in-cables.html https://www.electricaltechnology.org/2015/06/cable-faults-ho...
- daemoncoder 6y agoTime-domain reflectometry
- Koffiepoeder 6y agoAlso, fiber optics needs repeaters, so as a first rough estimate resource you can very quickly determine between which two repeaters the cable was broken.
- LuxuriousCheese 6y agoISPs or dark fiber providers have detailed maps aligning with road networks. If there’s a suspected fiber cut they’ll run an OTDR from the ODF box or the source photonic equipment which will show high reflection/ signal degradation where the break occurred to the nearest 100m dependant on test granularity.
- swarnie_ 6y ago> ISPs or dark fiber providers have detailed maps aligning with road networks. Most of the time. I worked a summer for Virgin (UK) basically digging holes to run cables. I'd say 1 in every 6-7 jobs we dug the hole and found no existing Virgin inf. in the ground. You'd have to come back the next day hopefully with better information to try again.