Cisco 12406 Installation And Configuration Manual page 125

Chapter 3 Installing the Router
Connecting to the Console and Auxiliary Ports
Figure 3-10 Flash Memory Card Slot Opening
Ensure that a console terminal is connected to the RP console port and turned on,
or that you have a remote login to the router from another device through a Telnet
session.
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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