What is the NEC X0421C?
The NEC X0421C is a network switch, listed by the manufacturer as "RC-28D SWITCH -48V". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
Manufactured by NEC, the X0421C (RC-28D SWITCH -48V) is a network switch. Circular Telecom sources, tests, and resells surplus and refurbished NEC equipment like this as part of a lower-carbon alternative to new procurement.
Common Questions
The NEC X0421C is a network switch, listed by the manufacturer as "RC-28D SWITCH -48V". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished NEC network equipment, including parts such as the X0421C, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue