The Cisco Video Surveillance 3520 IP Camera is now obsolete (past End-of-Life and End-of-Support status).
End-of-Sale Date: 2016-07-29
End-of-Support Date: 2021-07-31
Cisco's End-of-Life Policy
You can view a listing of available Cisco Video Surveillance 3000 Series IP Cameras offerings that best meet your specific needs
If you want support information for the Cisco Video Surveillance 3520 IP Camera documentation, it may be available through Cisco.com Search or in the Cisco Community