Technicolor - Thomson SpeedTouchTM620 manual About the Isdn Modem

Chapter 9

The Integrated SpeedTouch™ ISDN Modem

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.

For more information see, “Fall-back Connections with the Integrated

ISDN Modem Application Note”

ISDN software key It is necessary to enable the ISDN module for full deployment.

For more information see, “The SpeedTouch™ 605/608 (WL)/620 User’s

Guide”.

The ISDN modem as initiator or responder

Security

PPPon top of the ISDN Modem

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™.

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.

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.

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”

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