How do you identify a fault in a fiber optic cable?

Using an OTDR, or Optical Time Domain Reflectometer, is an effective way to identify faults in fiber optic cables. An OTDR sends a series of light pulses into the fiber and measures the light that is reflected back. This allows the technician to detect discontinuities, bends, and breaks in the fiber. The OTDR provides a detailed trace of the light signal, enabling the identification of the exact location and nature of the fault. This precision makes OTDRs a valuable tool for troubleshooting and maintenance in fiber optic systems.

The other methods mentioned, while they can be useful in certain situations, do not offer the same level of accuracy or specificity as the OTDR. Visual inspection can sometimes indicate issues like bends or kinks, but it won't provide detailed information about the performance of the fiber or pinpoint the exact location of a fault. A multimeter measures electrical properties and is not suitable for testing glass fibers, as they transmit light, not electricity. Manual testing may involve checking connections or other components, but it is less systematic and thorough than using an OTDR, which is specifically designed for fiber optic diagnostics.