CRM Engineering Services provides Finite Element Analysis services in support of our clients efforts in obtaining NEBS Zone 4 Seismic compliance. Our clients have found that simulating the shaker test on a virtual product using FEA is far cheaper than two or more prototypes on a real shaker table.
GR-63-CORE Physical Protection deals with physical characteristics of the equipment. The earthquake simulation of GR-63-CORE is a comparatively severe test. It simulates a 32s pulse with the shock response spectra at the base of the frame in the range of 5g with an amplitude of approximately 10 in. peak-to-peak. The excitation of the framework is measured at both the middle and the top of the frame. The displacement at the top of the frame is measured relative to the base and must not exceed 3 in., zero to peak.
NEBS - (Network Equipment Building Standards) sets the conformance requirements that regulate both the quality and reliability of telecom equipment used throughout the telecommunications industry.
BellCore - (Bell Communications Research) established NEBS compliance as the telecommunications industry compliance standards to insure that communications equipment remains functional.
Telcordia - Telcordia was created during the divestiture of the Bell System in 1984 to serve the Bell Companies. Telcordia publishes the NEBS GR-63-CORE Physical Protection Standards, including Level 3 Zone 4 Compliance Testing, and is intended to address issues of reliability of telecommunications equipment designed around a central office (CO) installation.