ISDN provides a faster data transfer rate than modems by using the bearer channel (B channel of 64Kbps).

With multiple B channels, ISDN offers users more bandwidth on WANs than some leased lines. For example, if you were to use two B channels, the bandwidth capability is 128Kbps because each B channel handles 64Kbps.

ISDN B channels carry voice, data and image .

ISDN can provide a clear data path over which to negotiate PPP links.