34
To work with the SSH server, you might need to configure the SSH client. For information about
configuring the SSH client, see Security Configuration Guide.
Logging in through a pair of modems
You can use a pair of modems to remotely connect to the console port of the device over PSTN when the
IP network connection is broken.
By default, modem dial-in is enabled, and you can dial in to the switch. The default user role is
network-admin. To change modem dial-in parameters, see "Logging in through the co
n
sole port locally."
To use a pair of modems to remotely log in to the device:
1. Connect one modem to the serial port of the PC and another modem to the console port of the
device.
2. Connect each modem to the PSTN through a telephone cable.
Figure 10 Connecting the PC to the device through modems
3. Obtain the telephone number of the device-side modem.
4. Configure the following settings on the device-side modem:
{ AT&F—Restores the factory default.
{ ATS0=1—Configures auto-answer on first ring.
{ AT&D—Ignores DTR signals.
{ AT&K0—Disables local flow control.
{ AT&R1—Ignores RTS signals.
{ AT&S0—Forces DSR to remain on.
{ ATEQ1&W—Disables the modem from returning command responses and execution results,
and saves configuration.
To verify your configuration, enter AT&V to display the configuration results.
NOTE:
The configuration commands and output vary by modem. For more information, see the modem user
guide.
5. To ensure successful communication and to avoid data loss, verify that the modems use a
transmission rate that is higher than the baud rate of the console port.
6. Launch the terminal emulation program on the PC and create a connection using the telephone
number of the device-side modem.
Figure 11 through Figure 14 show the
co
nfiguration procedure in Windows XP HyperTerminal.
On Windows Server 2003, add the HyperTerminal program first, and then log in to and manage
the device as described in this document. On Windows Server 2008, Windows 7, Windows Vista,
or another operating system, obtain a third-party terminal control program first, and then follow
the user guide or online help of that program to log in to the device.
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