The (released in December 2017) is the current definitive standard for the Network Equipment Building System (NEBS) physical protection requirements. This document establishes the minimum spatial and environmental criteria for telecommunications equipment used in Central Offices (COs) and other controlled environments.
Another key change was the introduction of a new "security by design" approach, which emphasized the importance of incorporating security considerations into the equipment design process from the outset. This would require manufacturers to think more holistically about security, rather than simply adding it as an afterthought. gr-63-core issue 5 pdf
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