3Com Switch 7754, Configuration Manual

Page: 65 / 940

5
L
OGGING IN
U
SING
M
ODEM
Introduction
The administrator can log into the Console port of a remote switch using a
modem through PSTN (public switched telephone network) 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 log into
the switches in the network in this way to configure these switches, to query logs
and warning messages, and to locate problems.
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.
Configuration on the
Administrator Side
The PC can communicate with the modem connected to it. The modem is properly
connected to PSTN. And the telephone number of the switch side is available.
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 af
ter 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 com
mand response and the result, save the changes
Table 29 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.