NEBS stands for "Network Equipment-Building System". NEBS describe the environment of a typical Regional Bell Operating Company (RBOC) Central Office (CO). This description includes spatial and environmental criteria. Typical equipment line-ups are described including the environment they're exposed to.
NEBS were developed by Bell Labs back in the 1970s to standardize equipment that would eventually be installed in a CO. The intent was to make it easier for a vendor to design equipment compatible with a typical RBOC CO. This would result in lower development costs and ease the equipment's introduction into the network. The main Bellcore document is GR-63-CORE, Network Equipment-Building System (NEBS) Requirements: Physical Protection
This document identifies the minimum spatial and environmental criteria used for new telecommunications equipment to be used in an RBOC's CO.
The spatial criteria cover:
• cable distribution systems
• distributing and interconnecting frames
• power equipment
• operations support systems
• cable entrance facilities
The environmental criteria cover:
• temperature & humidity
• fire resistance
• equipment handling
• earthquake
• office vibration & transportation vibration
• airborne contaminants
• acoustic noise
• illumination
GR-1089-CORE Details Electromagnetic Compatibility (EMC) and Safety requirements, including:
• Electrostatic Discharge (ESD)
• Electromagnetic Interference (EMI)
o Radiated Emissions - (Electric Fields)
o Radiated Emissions - (Magnetic Fields)
o Conducted Emission (AC Power Leads - Voltage)
o Conducted Emission (AC and DC Power and Signal Leads - Current)
o Conducted Emission (Analog Voiceband Leads)
• Lightning and AC Power Fault
• Steady-State Power Induction
• DC Potential Difference
• Electrical Safety
• Corrosion
• Bonding and Grounding
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