Network Modules with Four GbE, Two 10GbE SFP+ Interfaces, Two 10GB-T and Service Module with Two 10GbE SFP+ Interfaces. The Cisco Catalyst 3750-X Series and 3560-X Series Switches support four optional network modules for uplink ports. The default switch configuration doesn't include the uplink module; at the time of switch purchase the customer has the flexibility to choose from the network modules The SFP+ interface supports both 10GbE and GbE port, allowing customers to use their investment in GbE SFP and upgrade to 10GbE when business demands change, without having to do a comprehensive upgrade of the access switch. The four uplink modules are hot swappable. Product Number Product Description C3KX-NM-1G Four GbE port network module C3KX-NM-10G Two 10GbE SFP+ ports network module with four physical ports with two SFP+ and two regular SFP ports C3KX-NM-10GT Two 10GB-T ports network module C3KX-SM-10G Service Module with two 10GbE SFP+ ports network module for Netflow and MACsec encryption