A mechanism by means of which telephone companies will be able to carry television signals (and, probably ATV signals) digitally, probably via optical fibers.

ISDN systems are considered broadband if they carry at least 45 Mbps, the DS3 rate, currently used for delivery of broadcast television signals. If and when B-ISDN reaches homes it will be a powerful competitor to other delivery mechanisms, potentially able to perform a computer-television function.