This OID sets the starting hour (0-23 in 24-hour format) when dial backup will be disabled, typically during business hours when backup isn't needed. Network engineers use this to prevent expensive dial backup charges during periods when backup connectivity isn't critical, such as during business hours when staff can monitor and intervene. For example, setting this to 8 means dial backup disables at 8:00 AM and won't re-enable until the end-lockout hour, reducing after-hours costs if your primary link is stable during the day.