The GB/T28181 protocol supports active registration, using digital digest-based challenge-response security technology for registration, and authentication should be performed during registration.

There are two types of lightning protection devices for video sites: power surge protectors and signal surge protectors.

Regarding Huawei HoloSens IVS3800c, which of the following descriptions is correct? (Multiple Choice)

By supporting the use of PowerCube 500 and the intelligent network management system, fault alarms and real-time monitoring data can be reported to the upper-level network management.

How many levels of collaboration can the upper and lower domain resource collaboration support?