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Chapter 9
The Integrated SpeedTouch™ ISDN Modem
E-DOC-CTC-20051017-0155 v1.0
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9.1 About the ISDN Modem
Introduction Next to the DSL, Ethernet and Wireless interface, the SpeedTouch™ features an
ISDN modem, to allow the end user Internet connectivity.
Scenarios The ISDN modem can be used as:
A stand alone WAN interface to connect to the Internet or corporate network
A fall back interface for the DSL interface.
Dial-in WAN interface for remote access or dial-in networking.
ISDN software key It is necessary to enable the ISDN module for full deployment.
The ISDN modem as
initiator or responder
The ISDN modem can be configured as follows:
As Initiator (Dial out):
The SpeedTouch™ starts the connection.
As Responder (Dial in):
Configure the SpeedTouch™ as a responder if you want to set up a connection
from another device towards the SpeedTouch™.
Security There are 3 ways of securing the ISDN modem of the SpeedTouch™.
Reduce the amount of people that can dial in to the SpeedTouch™ by
configuring a group of allowed dial-in numbers.
On a higher layer level, it is possible to configure the Stateful inspection
firewall to allow a range or one single IP address to dial in to SpeedTouch™.
Maintain a smart user policy by configuring users, using the multi-level
SpeedTouch™ access policy.
PPP on top of the ISDN
Modem
The SpeedTouch™ supports PPP over ISDN (PPPoI), which implies that all the
features of a PPP connection are applicable on the SpeedTouch™ ISDN modem
such as dial-on-demand (dod) connections which are mostly used for ISDN
connections.
For more information see, “Fall-back Connections with the Integrated
ISDN Modem Application Note”
For more information see, “The SpeedTouch™ 605/608 (WL)/620 User’s
Guide”.
!
If both an ADSL and ISDN interface are configured, make sure to give a
proper value to the doddelay of the ISDN modem.
For more information see, “Fall-back Connections with the Integrated ISDN
Modem Application Note”