Cisco 2500 Series Installation And Configuration Manual page 34

Installing the Router
Figure 3-12: Connecting the Token Ring Cable
Step 3 If you will be using AutoInstall to configure the router, connect the synchronous serial port
(DB-60) to a CSU/DSU or other DCE device, as shown in
AutoInstall (or you are not sure what AutoInstall is) do not connect the WAN cable until after you have
configured the router. If a WAN cable is connected when you power ON the router for the first time, it
will attempt to run AutoInstall to download a configuration file from a TFTP server. It can take several
minutes for the router to determine that the necessary files are not in place for AutoInstall to begin. For
more information about AutoInstall, refer to the chapter "Configuring the Router."
Note The synchronous serial port supports the following signaling standards: EIA/TIA-232,
EIA/TIA-449, V.35, X.21, and EIA-530.
Figure 3-13: Connecting Synchronous Serial Cables
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Figure 3-13. If you do not plan to use