Most modems have an RS-232 DB-25 connector. You must separately purchase
an adapter to connect your modem to the RJ-45 to DB-9 adapter and Ethernet
cable supplied with the router.
To connect the dial-up modem to the console port on the router:
Turn off power to the router.
Turn off the power to the modem.
Plug one end of the Ethernet rollover cable supplied with
your router into the console port on the router.
Plug the other end of the Ethernet rollover cable into
the RJ-45 to DB-9 serial port adapter supplied with your router.
Connect the serial port adapter to a separately purchased
DB-9 female to DB-25 male adapter, or other adapter appropriate for your modem.
Plug the modem adapter into the DB-25 connector on the
modem.
Connect the modem to your telephone network.
Turn on the power to the modem.
Power on the router by pressing the power button
on the front panel. Verify that the POWER LED on the front panel
turns green.