About This Manual 
Organization 
H3C S5120-EI Series Ethernet Switches Installation Manual is organized as follows: 
Chapter  Contents 
1 Product Overview 
Briefly introduces the appearance, system description, as well as the 
features and applications of the S5120-EI series switches. 
2 Preparing for Installation 
Describes the requirements on installation site, the safety 
recommendations before and during installation, and the required 
tools. 
3 Installing the Switch 
Covers the procedures for installing the S5120-EI series switches, 
ground wire connection, power module installation, interface module 
installation, and so on. 
4 Starting and Configuring 
the Switch 
Helps you get familiar with the basic knowledge of how to boot and 
configure the S5120-EI series switches, including device startup, 
power-on, and initialization of system files, and so on. 
5 Boot ROM and Host 
Software Loading 
Introduces how to load Boot ROM and host software for an S5120-EI 
series switch  
6 Maintenance and 
Troubleshooting 
Introduces the problems that might occur during the installation and the 
booting of an S5120-EI series switch and the related solution. 
Appendix 
Appendix A: Lightning protection of the S5120-EI series switches. 
Appendix B: Provides compliance and safety manual. 
 
Conventions 
The manual uses the following conventions:  
GUI conventions 
Convention  Description 
Boldface 
Window names, button names, field names, and menu items are in 
Boldface. For example, the New User window appears; click OK. 
> 
Multi-level menus are separated by angle brackets. For example, File > 
Create > Folder. 
 
Symbols 
Convention  Description 
 
Means reader be extremely careful. Improper operation may cause 
bodily injury.  
 
Means reader be careful. Improper operation may cause data loss or 
damage to equipment.  
 
Means a complementary description.