3Com 4200G 12-Port, Configuration Manual

Page: 40 / 422

26 C
HAPTER
4: L
OGGING IN
U
SING
M
ODEM
Switch Configuration
After logging into a switch through its Console port by using a modem, you will enter
the AUX user interface. The corresponding configuration on the switch is the same as
those when logging into the switch locally through its Console port except that:
■
When you log in through the Console port using a modem, the baud rate of the
Console port is usually set to a value lower than the transmission speed of the
modem. Otherwise, packets may get lost.
■
Other settings of the Console port, such as the check mode, the stop bits, and the
data bits, remain the default.
The configuration on the switch depends on the authentication mode the user is in.
Refer to Table 13 in Chapter 3 for the information about authentication mode
configuration.
Configuration on switch when the authentication mode is none
Refer to “Configuration on switch when the authentication mode is none”.
Configuration on switch when the authentication mode is password
Refer to “Configuration on switch when the authentication mode is password”.
Configuration on switch when the authentication mode is scheme
Refer to “Configuration on switch when the authentication mode is scheme”.
Modem Connection
Establishment
1 Configure the user name and password on the switch. Refer to “Console Port Login
Configuration with Authentication Mode Being None”, “Configuration on switch
when the authentication mode is password”, and “Configuration on switch when
the authentication mode is scheme” in Chapter 3 for more.
2 Perform the following configuration on the modem directly connected to the switch.
AT&F ----------------------- Restore the factory settings
ATS0=1----------------------- Configure to answer automatically after
the first ring
AT&D ----------------------- Ignore DTR signal
AT&K0----------------------- Disable flow control
AT&R1----------------------- Ignore RTS signal
AT&S0----------------------- Set DSR to high level by force
ATEQ1&W----------------------- Disable the modem from returning command
response and the result, save the changes
You can verify your configuration by executing the AT&V command.
The configuration commands and the output of different modems may differ. Refer
to the user manual of the modem when performing the above configuration.
It is recommended that the baud rate of the AUX port (also the Console port) be set
to a value lower than the transmission speed of the modem. Otherwise, packets may
get lost.