A technician is troubleshooting a point-to-point fiber-optic connection. The technician is at a remote site and has no connectivity to the main site. The technician confirms the switch and the send-and-receive light levels are within acceptable range. Both fiber SFPs are confirmed as working.
Which of the following should the technician use to reveal the location of the fault?
A . OTDR
B . Light meter
C . Tone generator
D . CSU/DSU
Answer: A