User guide

USR4204 User Guide
Page 14 of 69
Remotely Connecting and Managing Using Dialup
To connect to the USR4204 and manage the attached equipment at the remote site via the
analog phone network, the user will need a terminal emulation application, a modem, and a
phone line at the management site to initiate the connection.
From the terminal, dial the phone number of the modem at the equipment site.
Once the modems connect, the USR4204 should send the Main Menu or login prompt to the
management terminal. The attached equipment can be managed from the USR4204 Main
Menu.
If the Main Menu or login prompt does not automatically appear, hit Enter. If
the Main Menu or login prompt still does not appear on the terminal, check
the Troubleshooting section.
Setup Using a Cellular Modem
Most cellular networks do not allow a cellular modem to connect peer-to-peer with another
modem. Therefore in a cellular setup, the modem is an IP client that communicates with an
IP server. For out-of-band remote management, the IP server typically is a terminal used by
a Network Manager for real-time communication to the remote equipment.
Confirm requirements for cellular connectivity:
 Computer with a TCP/IP protocols and Internet access
 Terminal emulation application with TCP/IP connectivity
 Cellular modem at the equipment site
 Access to a cellular network at the equipment site
The way to setup connectivity between a management terminal and a remote cellular
modem depends on whether the IP address of the modem is public or private and static or
dynamic. Contact your cellular operator about available options. The recommended setup
for cellular out-of-band remote management is private static IP addressing, which allows
immediate secure communication with the remote equipment through a VPN tunnel.
Configuring the Cellular Modem
The modem connected to the USR4204 must be pre-configured before connecting it to the
USR4204 at the equipment site. Depending on the modem’s capabilities, some settings may
not apply.
Fixed DTE Rate
The USR4204 terminal port has a fixed DTE rate of 9600bps, 8N1, so the modem must also
have a fixed rate of 9600bps, 8N1. Please consult your cellular modem documentation
about setting the modem DTE rate.
Result Codes - Disabled
If available, disable Result Codes to prevent USR4204 from misinterpreting modem Result
Codes as commands.