How does the network video surveillance system support alarm linkage and record simultaneously?

Alarm linkage can be divided into front-end alarm linkage, platform alarm linkage, and client alarm linkage. After the alarm event is triggered, the alarm output device directly outputs the alarm information at the front end through sound, light, electricity and other alarm output devices. At the same time, it can trigger the alarm recording of the front end; after the platform receives the alarm information, it can trigger the alarm linkage of the platform: send alarm short messages and customer emails, linkage Central video recording; after receiving the alarm signal, the client can immediately reflect it on the client's interface to remind the client that an alarm event has occurred.