What is the Cisco WS-X4904-10GE?
The Cisco WS-X4904-10GE is a circuit card / line card, listed by the manufacturer as "4 port wire speed 10GE card". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Cisco WS-X4904-10GE is a circuit card / line card — originally specified as "4 port wire speed 10GE card" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Cisco WS-X4904-10GE is a circuit card / line card, listed by the manufacturer as "4 port wire speed 10GE card". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
Circular Telecom sources and resells surplus and refurbished Cisco network equipment, including parts such as the WS-X4904-10GE, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue