# Interrupt event sequence Source: [https://docs.qualcomm.com/doc/80-PK177-134/topic/interrupt_event_sequence.html](https://docs.qualcomm.com/doc/80-PK177-134/topic/interrupt_event_sequence.html) Normal sequence of pre-handoff and handoff interrupt events with associated data. | Event | | --- | | PRE\_HANDOFF\_ENTRY() | | HANDOFF\_IMMINENT(estimatedTimeToInterruption) | | PRE\_HANDOFF\_EXIT() | | HANDOFF\_START(sourceRat, targetRat,
estimatedInterruptionDuration) | | HANDOFF\_SUCCESS() or HANDOFF\_FAILURE() | **Parent Topic:** [Link layer interruption (smart data link)](https://docs.qualcomm.com/doc/80-PK177-134/topic/link_layer_interruption.html) Last Published: Nov 14, 2024 [Previous Topic HandoffInfo](https://docs.qualcomm.com/bundle/publicresource/80-PK177-134/topics/handoff_info.md) [Next Topic Example code](https://docs.qualcomm.com/bundle/publicresource/80-PK177-134/topics/example_code_QC_3.md)