3Com 4210 PWR - Logging in Using a Modem

52 CHAPTER 2: LOGGING INTO AN ETHERNET SWITCH
Note that xxxx is the IP address or the host name of the switch operating as the
Telnet server. You can use the ip host to assign a host name to a switch.
4 After successful login, the CLI prompt (such as <4210>) appears. If all the VTY
user interfaces of the switch are in use, you will fail to establish the connection
and receive the message that says "All user interfaces are used, please try later!".
5 After successfully Telnetting to the switch, you can configure the switch or display
the information about the switch by executing corresponding commands. You can
also type ? at any time for help.
Logging in Using a
Modem
The administrator can log into the Console port of a remote switch using a
modem through public switched telephone network (PSTN) if the remote switch is
connected to the PSTN through a modem to configure and maintain the switch
remotely. When a network operates improperly or is inaccessible, you can manage
switches in the network remotely in this way.
To log into a switch in this way, you need to configure the administrator side and
the switch properly, as listed in the following table.
Configuring the Switch Modem Configuration
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.
n
The configuration commands and the output of different modems may differ.
Refer to the user manual of the modem when performing the above
configuration.
Tabl e 24 Requirements for logging into a switch using a modem
Item Requirement
Administrator
side
The PC can communicate with the modem connected to it.
The modem is properly connected to PSTN.
The telephone number of the switch side is available.
Switch side The modem is connected to the Console port of the switch properly.
The modem is properly configured.
The modem is properly connected to PSTN and a telephone set.
The authentication mode and other related settings are configured on the
switch. Refer to
Table 13.