Used Cisco C3KX-NM-1G gigabit expansion module, suitable for 3750X and 3560X.

Brand: Cisco

Model: C3KX-NM-1G

Condition: Used

Warranty: 1 year

Ports:​ 4 × 1G SFP slots (supports 1000BASE-SX/LX/ZX/BX optical modules and 1000BASE-T copper SFP)

Compatible Models:​ Cisco Catalyst 3750-X series (e.g., 3750X-24T/48T/P/E) and 3560-X series (e.g., 3560X-24T/48T/P/PF)

Not Supported:​ 10G SFP+ modules (insertion will be invalid and cause errors)