The Cisco ESW520 48-Port 10/100 Switch is now obsolete (past End-of-Life and End-of-Support status).
End-of-Sale Date: 2012-03-30
End-of-Support Date: 2017-03-31
Cisco's End-of-Life Policy
You can view a listing of available Switches offerings that best meet your specific needs
If you want support information for the Cisco ESW520 48-Port 10/100 Switch documentation, it may be available through Cisco.com Search or in the Cisco Community