ISDN fact sheet | ACMA

ISDN fact sheet

The integrated services digital network (ISDN) is a digital network technology that can carry voice and data services in a digital format over the public switched telephone network. In Australia, ISDN services can either be a basic rate service, known as ISDN 2 or a primary rate service, known as ISDN 10/20/30.

A basic rate service provides users with two 64 kilobits per second (kbit/s) channels, which can be combined to make a 128 kbit/s channel. The basic rate service can carry voice and data traffic simultaneously and was intended to be utilised by home users and by small and medium sized businesses.

A primary rate service provides users with ten, twenty or thirty 64 kbit/s channels allowing for a maximum data rate of approximately 2 megabits per second (Mbit/s). Primary rate services are generally used by medium to large sized businesses.

Can I get ISDN?

During the digitalisation of the public switched telephone network, ISDN was used in the provision of a second digital telephone service to some residential homes. This also enabled faster internet speeds when used for dial-up internet access.

ISDN is now not widely available for residential users and is primarily utilised in the provision of business voice and data services. Asynchronous digital subscriber line (ADSL), cable and wireless broadband have replaced ISDN services in the consumer internet access market.

More information

For more information on ISDN, please contact your service provider.

Please note: this document is intended as a guide only and should not be relied on as legal advice or regarded as a substitute for legal advice in individual cases.

Last updated: 02 May 2017