# LLI subsystem APIs Source: [https://docs.qualcomm.com/doc/80-PK177-134/topic/lli_subsystem_apis.html](https://docs.qualcomm.com/doc/80-PK177-134/topic/lli_subsystem_apis.html) - **[Constructor](https://docs.qualcomm.com/doc/80-PK177-134/topic/creator_QC_1.html)** Constructor for the main link into the LinkInterrupt subsystem. - **[registerForLinkInterruptIndications](https://docs.qualcomm.com/doc/80-PK177-134/topic/register_for_link_interrupt_indications.html)** Subscribes to interrupt events happening before and during handoff. **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 Link layer interruption (smart data link)](https://docs.qualcomm.com/bundle/publicresource/80-PK177-134/topics/link_layer_interruption.md) [Next Topic Constructor](https://docs.qualcomm.com/bundle/publicresource/80-PK177-134/topics/creator_QC_1.md)