GR-63-CORE Issue 5 (December 2017) defines essential NEBS™ standards for telecommunications equipment, covering physical, environmental, and seismic criteria . This update by Telcordia Technologies (Ericsson)
This article will explain what GR-63-CORE Issue 5 contains, why it was updated, who needs it, and—most importantly—how to legally obtain the without falling into common pitfalls. gr63core issue 5 pdf link