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How to install HWIC-4T1/E1 on Cisco 2921

I just install two HWIC-4T1/E1 on Cisco Router 2921, but i don't see the interfaces in the show ip interface brief? Do i need to add some commands to enable the cards or the interfaces ?
www.router-switch.com/hwic-4t1-e1-p-1132.html