Ref: 18960009
Title: Using Dial-Back Modems with Remote PC
Date:  06/22/90

Copyright 3Com Corporation, 1991.  All rights reserved.

3Com's 3+ and 3+Open network operating systems transmit XNS packets
encapsulated within MNP packets across phone lines, so they are less
susceptible to unauthorized access than many other hosts and networks
because the intruder would have to be running Remote PC, 3+Route, or
3+Open Internet service to successfully generate and decode these
packets.

Dial-back modems are also an effective and commonly used method
of providing security for computer networks.  Because Remote PC was not
designed to take dial-back modems into account, they are not supported by
3Com.  However, if you require dial-back modem access to a 3Com network,
it can be made to work as follows:

1.  Set up the Remote PC disk as documented in the Installation/Configuration
Guide.

2.  Edit the AUTOEXEC.BAT file to pause before dialing.

3.  Edit the PROFILE.SYS file to add the line "LINE1=;ATD".

The command tells Remote PC to place the modem in Command mode (;) and then
pick up the phone line in Originate mode.

4.  Boot the PC, and wait for the pause statement within the AUTOEXEC.BAT
file to be executed.

5.  Manually dial the phone number, enter any codes necessary, then hang
up.  When the phone rings, press Enter on the PC to continue the AUTOEXEC.BAT
file and issue the ATD.

These procedures were tested with a LeeMah Datacom Traqnet 2001 dial-back
device.
