The NMC2R20 is a 2U high 19" Rack, 20 slot modular media converter rack. It provides an economic solution in high density fiber converter installations in enterprises or central offices. All critical components, power, fans, management module and interface cards are hot swappable, allowing online field replacement. The hot-swappable power modules can be chosen from AC100 to 240V, DC 36 to 75V. The chassis also has a pair of alarm relays and is able to stack up to 10 chassis as one management IP address.