A version of ISDN with all its advantages but working at broadband speed rather than basic rate (144kbits/sec) or primary rate (2Mbits/sec). In this context broadband is defined as 150Mbits/sec and 600 Mbits/sec.
The proposed advanced version of ISDN, providing speeds of 155.52Mbit/s and higher. Standards and switching technology that will work this fast are under development. It promises universal coverage based on ATM/SDH technologies and optical fiber, supporting data, voice and video traffic.
A second generation of ISDN. The key characteristic of broadband ISDN is that it provides transmission channels capable of supporting rates greater than the primary ISDN rate. Standards being developed for ISDN to handle applications such as video requiring high bandwidth.
155.52Mbit/s and higher. I have never seen it used.
A nascent, 150Mbit/s, packet switching, carrier technology expected in the late 1990s. A ITU-T standard.