Issue 5 introduced several critical refinements to streamline testing and improve safety:
: Many engineers access these through their organization's internal document coordinators or corporate account managers. Key Updates in Issue 5 gr63core issue 5 pdf link
: Standards for airflow and fan filters to protect sensitive electronics from gaseous and particulate pollutants. GR-63 - NEBS Requirements: Physical Protection - Telcordia gr63core issue 5 pdf link