What is the Cisco CFP-100G-ER4?
The Cisco CFP-100G-ER4 is a CFP optical transceiver, listed by the manufacturer as "CISCO 100GBASE-ER4 CFP MODULE". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Cisco CFP-100G-ER4 is a CFP optical transceiver — originally specified as "CISCO 100GBASE-ER4 CFP MODULE" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Cisco CFP-100G-ER4 is a CFP optical transceiver, listed by the manufacturer as "CISCO 100GBASE-ER4 CFP MODULE". 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 CFP-100G-ER4, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue