Hi,
The CAB-SFP-50CM is only for c3560 switches. You can not use it with 2960 switches
Q. What is the Cisco Catalyst 3560 SFP Interconnect Cable?
A. The Cisco Catalyst 3560 SFP Interconnect Cable provides for a low-cost point-to-point
Gigabit Ethernet connection between Catalyst 3560 switches. The 50cm cable is an
alternative to using SFP transceivers when interconnecting Catalyst 3560 switches through
their SFP ports over a short distance.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12220se1/3560hg/higoverv.htm#wp1129518
Hope it helps
Franco Zamora