User`s guide

Configure Physical Serial Ports
Chapter 5 Configure Ports 73
Dial-In Modem Mode
In dial-in modem mode, the Digi Passport unit assumes an external
modem is attached to the serial port and is waiting for a dial-in connection
from a remote site. When a user dials in using a terminal application, the
Digi Passport unit accepts the connection and displays the appropriate
prompt or menu. For example, user root would see the command line
interface (CLI), while user admin would see the configuration menu or CLI
depending on the shell for that user.