The Radiance Chassis platforms provide a flexible, scalable and manageable means for integrating coax; Category 3, 4 or 5 twisted pair; and single mode or multimode fiber optic LAN segments into Ethernet, Fast Ethernet, Gigabit Ethernet, SONET and TDM environments. Metrobility offers four chassis platforms to support its wide range of interface and access line cards. The Radiance R5000 is a NEBS Level 3 certified 19" or 23" rack-mountable 2U platform which supports two rear-loading, redundant, load-sharing, hot-swap AC or DC power supplies, 16 slots for connectivity, and one slot for optional management access. The Radiance R1000 is a NEBS Level 3 certified 1U rack-mounted unit with dual, load-sharing AC or DC power, and accommodates two line cards. The R1000 has a separate bus path for management, data and power for more efficient internal communications. The R200 is a standalone unit, which accommodates a single line card. The R200 is equipped with an internal AC or DC power supply.