The source DESCRIPTION for this object is empty, but its name, its UNITS of seconds, its DEFVAL of 0, and its place in this dial-backup configuration table strongly suggest it sets how long the primary interface must be down before the dial-backup connection activates. A network administrator would tune this delay to avoid triggering an unnecessary (and possibly costly, per-minute-billed) dial backup connection over a brief, self-recovering link blip. For example, setting dialBackupFailoverTime to 30 would mean the primary link must stay down for 30 seconds before the backup dial connection is triggered.