Cisco 1721 - Manual (Page 34)

Chapter 2 Installation
Connecting the Router to Your Local Network
2-2
Cisco 1721 Router Hardware Installation Guide
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Warning Read the installation instructions before you connect the system to its power
source.
Warning Do not work on the system or connect or disconnect cables during periods
of lightning activity.
Caution Do not place anything on top of the router that weighs more than 10 pounds
(4.5 kg). Excessive weight on top of the router could damage the chassis.
Connecting the Router to Your Local Network
The Cisco 1721 router is connected to your local Ethernet network through the
yellow 10/100 Ethernet port. You must provide the following items for this
connection:
• A straight-through, RJ-45-to-RJ-45, Ethernet cable
• A 10/100-Mbps Ethernet hub or switch
Warning The ports labeled 10/100 ETHERNET and CONSOLE are safety extra-low
voltage (SELV) circuits. SELV circuits should only be connected to other
SELV circuits. Because BRI circuits are treated like telephone-network
voltage, avoid connecting the SELV circuits to the telephone network
voltage (TNV) circuits. (To see translated versions of this warning, refer to
the Regulatory Compliance and Safety Information for Cisco 1700 Routers
document that came with the router.)
Caution Always connect the Ethernet cable to the yellow ports on the router. Do not
connect the cable to an ISDN S/T or U port (on a WIC) or to an NT-1 that is
connected to a WIC. Accidentally connecting the cable to the wrong port can
damage your router.