Which formula is used for calculating the normal attenuation of coaxial drop cable?

The formula used for calculating the normal attenuation of coaxial drop cable is based on the relationship between cable length and its attenuation characteristics measured in decibels. The correct choice allows you to determine the attenuation over a certain length of coaxial cable by taking the length in feet, dividing it by 100 to standardize the measurement, and multiplying it by the cable's attenuation value expressed in decibels per 100 feet.

This calculation is crucial as it provides a straightforward way to predict signal loss due to cable length, which is essential for maintaining signal quality in telecommunications. When using this formula, it is important to ensure that the attenuation is specified per 100 feet because this aligns with the calculations designed to help technicians assess performance consistently across different length runs.

The other options do not appropriately relate the cable length to its attenuation in a standard manner that professional practices require, leading to less reliable or correct calculations.