Connect the Cisco 805 Router to a Serial Device
Figure 4 Connecting a Serial Device to a Cisco 805 Router
LINK
HUB NO HUB
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CONSOLE
Cisco
805 
SERIAL
Cisco 805 Router
Modem or
CSU/DSU
Note In some countries, a modem or CSU/DSU might not be necessary or might be provided by your WAN service provider.
Step 1 Connect the appropriate end of the serial cable to the dark blue serial port on your router.
Step 2 Connect the other end of the cable to the modem or CSU/DSU.
Connect the Cisco 805 Router to a Serial Device
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