Related Documentation 
In addition to this manual, each H3C S5120-EI Series Ethernet Switch documentation set includes the 
following: 
Manual  Description  
H3C S5120-EI Series Ethernet 
Switches  Operation Manual 
It is used for assisting the users in data configurations and 
typical applications. It includes Product Overview, Access 
Volume, IP Service Volume, IP Routing Volume, IP Multicast 
Volume, QoS Volume, Security Volume and System Volume. 
H3C S5120-EI Series Ethernet 
Switches  Command Manual 
It is used for assisting the users in using various commands. It 
includes Command Index, Access Volume, IP Services Volume, 
IP Routing Volume, IP Multicast Volume, QoS Volume, Security 
Volume and System Volume. 
 
Obtaining Documentation and Technical Support 
To obtain up-to-date documentation and technical support, go to http://www.h3c.com and select your 
country or region. Depending on your selection, you will be redirected to either of the following websites:  
At http://www.h3c.com 
Documentation 
Go to the following columns for different categories of product documentation: 
[Products & Solutions]: Provides information about products and technologies, as well as solutions.  
[Technical Support & Document > Technical Documents]: Provides several categories of product 
documentation, such as installation, configuration, and maintenance.  
[Technical Support & Document > Software Download]: Provides the documentation released with the 
software version. 
Technical Support 
customer_service@h3c.com 
http://www.h3c.com 
At http://www.h3cnetworks.com 
Documentation 
1)   Select Drivers & Downloads in the Support area. 
2)   Select Documentation for Type of File and select Product Category. 
Technical Support 
Register Your Product 
Warranty and other service benefits start from the date of purchase, so it is important to register your 
product quickly to ensure you get full use of the warranty and other service benefits available to you.  
Warranty and other service benefits are enabled through product registration. Register your product at 
http://www.h3cnetworks.com, go to Support, Product Registration. Support services are based on 
accounts that you create or have authorization to access. First time users must apply for a user name 
and password that provides access to a number of eSupport features including Product Registration, 
Repair Services, and Service Request. If you have trouble registering your product, please contact 
3Com Global Services for assistance. 
Purchase Value-Added Services 
To enhance response times or extend warranty benefits, contact 3Com or your authorized reseller. 
Value-added services like Express
SM
 and Guardian
SM
 can include 24x7 telephone technical support, 
software upgrades, onsite assistance or advance hardware replacement. Experienced engineers are