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, handhel

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_reflectometer https://en.wikipedia.org/wiki/Optical_time-domain_reflectome...