NEBS (Network Equipment-Building System) describes the environment of a typical United States RBOC Central Office. NEBS is the most common set of safety, spatial and environmental design guidelines applied to telecommunications equipment in the United States. It is an industry requirement, but not a legal requirement.
If your customer decides that their products require NEBS certification for sale, ICA can test and certify your equipment for all of the NEBS standards including:

GR-63-CORE
GR-487-CORE
GR-1089-CORE
GR-3108-CORE

ICA can assist you both in certification (NEBS levels one, two, and three) as well as compliance for product family member—and save you money as well through our breadth of NEBS testing experience.