What is the Ciena 166-0042-900?
The Ciena 166-0042-900 is a cooling fan module, listed by the manufacturer as "CN4200RS-FAN". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Ciena 166-0042-900 is a cooling fan module — originally specified as "CN4200RS-FAN" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Ciena 166-0042-900 is a cooling fan module, listed by the manufacturer as "CN4200RS-FAN". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished Ciena network equipment, including parts such as the 166-0042-900, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue