Special Configuration Considerations
51
Configuring PPP/Modem
To use a Point-to-Point (PPP) connection, choose the appropriate hardware
connection (direct or modem). On the System Configuration page, select PPP for
Default Interface
.
The PPP interface provides a connection using modems over a telephone line.
Connect modems to the APs with straight-through serial cables. Designate one
AP as the
Originating
AP and the other AP as the
Answering
AP. Configure the
Originating AP with dial-out information to the answering AP. The answering AP
waits for a dial-in from the originating AP.
The AP supports modems that use the generic Hayes Smartmodem command
set The AP uses Hayes commands and is capable of operating with various
modems of 19200 baud or faster. 3Com does not support modems the
company has not qualified.
The following modems qualify to work with the AP:
■
Practical Peripherals PM288MT II V.34
■
Supra Fax Modem 288
■
US Robotics Sportster Modem 28.8
Configuring the Originating Modem
1
Select
Configuration-->PPP/Modem
. The
PPP/Modem Setup
page displays.
2
Select
Enabled
for
PPP Interface
.
3
Select
PPP
for
Serial
Port Use.
4
Select
Originate
for
Modem
Connect Mode.
5
Select
Yes
for
Modem Connected.
6
Select
Auto
for
Dialout Mode.
7
Select the appropriate mode for
Modem Speaker
.
This setting sends a command to the modem to turn the modem speaker on or
off. The default is
On
.
8
Type the telephone number (maximum 31 characters) of the answering AP for
Dialout Number
.
This string follows a typical Hayes Smartmodem ATDT command. Possible
characters include pauses, numbers and letters. Refer to your modem
documentation for specific information.
9
Enter the time in seconds that the AP will wait for a remote connection for
Answer
Wait Time.
If the AP does not make a remote connection in the amount of time you specify, it
will discontinue attempts to make a connection. The default is 60 seconds from a
5- to 255-second range.
10
Enter the time in minutes for
Inactivity Timeout.
This setting controls the time-out between issuing a PPP packet and the
anticipated reply. This is necessary if the serial connection has long delay periods.
Zero (0) indicates no time-out. The default is 3 from a 0 to 255-minute range.
