4-1
4 Logging in Using a Modem
Introduction
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.
Table 4-1 Requirements for logging into a switch using a modem
Item Requirement
The PC can communicate with the modem connected to it.
The modem is properly connected to PSTN.
Administrator side
The telephone number of the switch side is available.
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.
Switch side
The authentication mode and other related settings are configured on the switch. Refer to
Table 2-3.
Configuration on the Switch Side
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.
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