Question

you suspect a run of fiber-optic cable is broken somewhere in the ceiling plenum. what can you do to test this hypothesis? group of answer choices use a multimeter to test the cable. use a toner probe to test the cable. use an otdr to test the cable. use a tdr to test the cable.

Answer 1

To test a suspected break in a fiber-optic cable, an Optical Time-Domain Reflectometer (OTDR) should be used, as it is designed to locate faults in such cables by measuring the light reflected from the break point.

Step-by-step explanation:

If you suspect that there is a break in a fiber-optic cable, the best test instrument to use would be an Optical Time-Domain Reflectometer (OTDR). An OTDR sends a series of light pulses down the fiber-optic cable. It then measures the amount of light that is scattered or reflected back by the fiber. This helps in identifying the exact location of the fault or break within the cable. Unlike a Toner Probe or a Multimeter, which are more suitable for testing electrical wires, the OTDR is specifically designed for fiber-optic systems. A TDR (Time-Domain Reflectometer) operates on a similar principle to an OTDR but is tuned for use with electrical cables rather than fiber optics. Therefore, to test the hypothesis that a fiber-optic cable is broken, an OTDR would be the appropriate tool to use.