About Cisco NM-2FE2W-v2

Hi all I purchase a Cisco-2851 and NM-2FE2W-v2 module because i need 4 Fastethernet interface but when i plug the module IOS don't detect the module.Is there any specific IOS for the NM-2FE2W-v2 module?.now IOS version is 12.3.If any one have any idea pls reply me. thanks Kamal -- This message has been scanned for viruses and dangerous content, and is believed to be clean.