What is the Cisco QFBR-5798L?
The Cisco QFBR-5798L is a SFP optical transceiver module, listed by the manufacturer as "1000BASE-SX SFP". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
CircularTelecomParts Catalogue

Part Overview
The Cisco QFBR-5798L is a SFP optical transceiver module — originally specified as "1000BASE-SX SFP" — available refurbished or as surplus stock via Circular Telecom, supporting network operators sourcing decommissioned and reclaimed equipment.
Common Questions
The Cisco QFBR-5798L is a SFP optical transceiver module, listed by the manufacturer as "1000BASE-SX SFP". 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 QFBR-5798L, subject to current availability. Contact Circular Telecom for a live quote.
Circular Telecom Catalogue