Lenovo E43 Notebook - Manual (Page 29)

Chapter 2. Using your computer
23
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Using RJ-45 port
The LAN port accepts a standard RJ-45 connector, and allows you to
connect the computer to a high-speed DSL/cable modem connection and
local area network (LAN).
Attention:
As the voltage of a telephone connection is higher than that of a network,
do not attempt to connect a telephone cable to the LAN port as a short
circuit in the computer might occur.