What is the Cisco A9K-4X100GE?
The Cisco A9K-4X100GE is a circuit card / line card, listed by the manufacturer as "ASR 9000 4-port 100GE Line card". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
Manufactured by Cisco, the A9K-4X100GE (ASR 9000 4-port 100GE Line card) is a circuit card / line card. Circular Telecom sources, tests, and resells surplus and refurbished Cisco equipment like this as part of a lower-carbon alternative to new procurement.
Common Questions
The Cisco A9K-4X100GE is a circuit card / line card, listed by the manufacturer as "ASR 9000 4-port 100GE Line 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 A9K-4X100GE, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue