Comcast can now pinpoint fiber optic cable breaks within minutes
venturebeat.com
venturebeat.com
As a very experienced fiber person - OTDR has existed for decades, this is not new tech, its just new for them to advertise because they're just so bad.
If you want DF I guarantee someone else can light you up for cheaper. Even if not DF, someone else can build to you for 50% if not 200% cheaper. I used to do this monthly.
OTDR basically uses light to measure a fiber cable's performance. A lot of these devices have break locators in them.
and DF I imagine OP is talking about dark fiber. https://en.wikipedia.org/wiki/Dark_fibre
His phone goes "beep", he looks at it and goes "That's odd, we just lost two undersea fibres at the same time, about 50 miles off the east coast of Japan..."
Sometimes Sharks attack the cables too!
https://www.forbes.com/sites/melissacristinamarquez/2020/07/...