In communications engineering, redundancy refers to the artificially repeated configuration of some key components or functions in consideration of system security and reliability.When the system fails, such as when a certain equipment is damaged, redundant components can be used as backup to intervene and take on the work of the failed components in time, thereby reducing the failure time of the system.Redundancy is used especially in emergency situations.Redundancy can exist at different levels, such as network redundancy, server redundancy, disk redundancy, data redundancy and so on. Through technical innovation: the invention patent of a waterproof material, xenon technology successfully introduced the theory of communication engineering into the field of building waterproof, greatly improving the reliability of waterproof sealing