8.4 LAN integration of an IT system via ISDN

Description

ISDN (Integrated Services Digital Network) is a digital telecommunications network which allows the operation of a variety of services such as telephony and facsimile, as well as the transmission of data and images.

This chapter deals with the integration of a remote IT system into a local network via a public ISDN network. The remote IT system is linked by means of an ISDN adapter card possessing an S0 interface to the LAN via a router which is connected to a public ISDN network via an S2M interface.

This type of integration of remote IT systems constitutes a typical possibility for telecommuting workstations as well.

Threat Scenario

The following typical threats are generally assumed as regards baseline protection of an IT system integrated into a LAN via ISDN:

Force Majeure:

Organisational Shortcomings:

Human Failure:

Technical Failure:

Deliberate Acts:

Recommended Countermeasures (S)

For the implementation of IT baseline protection, selection of the required packages of safeguards ("modules") as described in chapters 2.3 and 2.4, is recommended.

The safeguard package for integration of an IT system into a LAN via ISDN is described in the following. The primary objective in this context is to ensure reliable communications. Further safeguards required for the communicating IT systems are specified in the related chapters (refer to Chapter 6 for routers, and Chapter 5 for remote IT systems).

The following measures are additionally recommended:

Infrastructure:

Organisation:

Personnel:

Hardware/Software:

Communications:


© Copyright by Bundesamt für Sicherheit in der Informationstechnik 2000

Last Update on 6 April 2000