Cisco switch catalyst WS-C2960S-48TD-L

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