First of all, cabinet dedicated socket is often called PDU. PDU is generally adopts modular structure, ensure the communication in the cabinet, and other important equipment of power supply, avoid because of high voltage or lightning induction and cause damage to equipment. Although PDU it is a small device, but it is the longest working hours in all kinds of equipment device, as long as there is equipment work, PDU would work. If the PDU quality is bad, it may cause power outages and even fire. So choose the high quality high performance network cabinets dedicated power allocation unit can ensure the safety of the system. What are the advantages of the PDU compared with the ordinary power socket, the following is the advantage of the PDU and ordinary socket is not have: 1, lightning protection, surge protection: the maximum impact resistance: 20 ka or higher; Low limit voltage: 500 v or more or less. 2, alarm, protection: LED digital display with alarm function of the entire current monitoring. 3, filtering protection: