The GR-63 (Network Equipment-Building System [NEBS] Requirements: Physical Protection) document identifies the minimum spatial and environmental criteria used for new telecommunications equipment to be used in an RBOC's (Regional Bell Operating Company's) Central Office (CO).
The spatial criteria covers:
Cable distribution systems
Distributing and interconnecting frames
Power equipment
Operations support systems
Cable entrance facilities
The environmental criteria covers:
Temperature & humidity
Fire resistance
Equipment handling
Earthquake
Office vibration & transportation vibration
Airborne contaminants
Acoustic noise
Illumination
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