In order to meet contractual and design requirements, telecomm equpiment destined for certain networks in North America must be tested to the Network Equipment Building System (NEBS) standard and comply with its requirements.  NEBS describes the environment of a typical Regional Bell Operating Company (RBOC) Central Office (CO). Telcordia GR-63-CORE is a NEBS standard that governs the spatial and environmental hardware requirements of a products for use in a CO. Adherence to the NEBS requirements is deemed essential to the reliability, availability, and durability of the Public Switched Telephone Network (PSTN)
Designing to these specifications include the thermal design of the system as well. ATS’s white paper and QPedia article, NEBS Compliance Testing: Thermal Management can help you successfully design to these standards.