C3KX-NM-1G Network Modules Catalyst 3560-X, 3750-X Series  Catalyst 3K-X 1G Network Module option PID

The Cisco Catalyst 3750-X Series and 3560-X Series Switches support an optional network module for uplink ports. The default switch configuration doesn't include the uplink module; the customer has the flexibility to choose from four GbE port (3KX-NM-1G) or two 10GbE port (3KX-NM-10G) network module at the time of switch purchase. The 10GbE uplink module features four physical ports with two SFP+ and two regular SFP ports. The SFP+ interface supports both 10GbE and GbE port, allowing customer 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 uplink module is hot swappable. The 10GbE network module can be used in any of the combinations