The switch has one hot-swappable network module that provides SFP and SFP+ uplink ports to connect to other devices. You must insert the network module during switch operation. Operating the switch without a network module is not supported. A blank module is available. The switch generates logs when you insert or remove a network module with SFP ports.
Cisco Systems Cisco Expansion module Gigabit LAN 4 ports for Catalyst 3560X24 3560X48 3750X12 3750X24 3750X48 C3KXNM1G Switch Accessories uk