Skip to main content


Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business.

Link Loss

The total measured power loss of a fiber-optic cable, point-to-point, span or link. The loss is the result of intrinsic attenuation plus extrinsic discontinuities in a fiber-optic cable. Link loss is wavelength-dependent and measured in decibels per kilometer of dB/km.