What aspect does Level 3 pathway survivability require?

Level 3 pathway survivability is a critical aspect of ensuring reliable communication, especially in emergency situations or environments where operational continuity is essential. This level requires the use of two-hour rated cables, which are designed to remain functional even in the presence of fire and heat for at least two hours. The inclusion of sprinkler systems offers an additional layer of protection against fire damage, but the specific requirement for pathway survivability at this level emphasizes the use of fire-rated cables to maintain communication pathways, thereby ensuring that vital systems remain operational during critical incidents. This focus on fire resistance and operational integrity supports the overall goals of survivability in data and communication infrastructure.