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NEBS Certification

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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