On an OTDR, what parameter determines the index of refraction (IoR) setting, and what happens if it is set incorrectly?
Answers
AThe manufacturer specifies the IoR; if incorrect, the OTDR will miscalculate the distance to events
BThe IoR is set by the pulse width; if incorrect, attenuation will be misread
CThe IoR is universally 1.000; changing it breaks the OTDR software
DThe IoR is determined by the laser wavelength; if incorrect, the trace will show false splices
The answer and explanation are in the full bank.
This question is one of 2,831 in the paid banks. Each comes with the correct answer and the reasoning behind it, not just a mark.
Unlock for 5,000 RWFMIFOTRA exam practicealigned to TIA-568.3-D / ITU-T G.652·3 marks·Medium
More Fiber Optics questions
- Which standard category represents the highest performance laser-optimized multimode fiber suitable for 100Gbps over short distances?
- A mechanical splice is showing a loss of 1.5 dB on a single-mode link. The tech pulls it apart, cleans it, and puts it back together, but it still reads 1.5 dB. The fiber ends were cleaved at a perfect 90-degree angle. What is missing?
- You are installing an FTTH router. The provider explicitly requires an APC connector, but you patch an SC/UPC cable into the SC/APC port. What happens?
- Why is 850nm strictly used for multimode fiber, while 1310nm and 1550nm are used for single-mode fiber?
- A technician strips the 250-micron acrylate coating off a fiber to prepare it for fusion splicing. They immediately put it into the cleaver without doing anything else. The splice machine rejects the fiber due to poor cleave angles. What step was skipped?
- An OTDR trace on a 10km link shows a massive drop at 5km, but no reflectance spike. What is the most likely cause of this event?
- A technician is using a dead-zone box (launch ring) of 1000m to test a 500m fiber link. Why is the launch cable longer than the link being tested?
- During an OLTS test, the technician sets a reference by connecting the light source and power meter with a single reference cord. Then, they add a second cord to test the link. What is this referencing method called?