A connector is a motor system that provides a separable interface for connecting two secondary electronic systems and does not produce an unacceptable effect on the operation of the system. The keywords in the definition are "motor system", "separable" and "unacceptable role". A connector is a motor system because it is electrically connected by mechanical means. As will be discussed, the biasing of the mechanical spring creates a force between the mating two parts, which creates a metallic contact between the mating faces of the interface. The reason for applying the connector in the first place is that the mating interface is separable. There are many reasons for the need for separability. It can be made to manufacture the parts or subsystems independently and the final assembly can be carried out in one main place. Severability also makes it possible to maintain or upgrade parts or subsystems without modifying the overall system. Another reason why separability is applied is portability and support for the expansion of peripheral devices. On the other hand, the separability in the definition introduces an additional interface between the subsystems, which can not introduce any "unacceptable role", especially in the characteristics of the system can not be affected by telecommunications, such as Unacceptable distortion and signal degradation between systems, or loss of power through the connector, loss of power loss in millivolts, will become the main design criteria for functionality, so the power requirements of the motherboard will also increase. The requirements for separability and the limits of "unacceptability" depend on the application of the connector. Detachable 4 properties include the number of mating cycles, which are the forces required for the connector to be provided without affecting its performance, and for mating with another connector. Typical mating cycle requirements range from tens of cycles of internal connectors to thousands of cycles of peripherals, such as PCMCIA type connectors. Due to the number of circuits or functions and the increased number of connectors connected to each other, the need for mating forces becomes even more important. In order to provide more functionality, the position of the terminals on the connector must also be increased, resulting in higher connector mating forces. The number of terminals varies from a few tens to thousands, depending on the use and function of the connector.

In all kinds of electronic systems of weapons and equipment, electrical connectors in the devices and components, components and components, systems and systems for electrical connection and signal transmission, constitute a complete system is essential to the basic components.

In a variety of military aircraft and weapons and equipment, the larger the amount of electrical connectors, especially the use of electrical connectors on the large amount of aircraft. Generally speaking, the use of an aircraft electrical connector up to hundreds of pieces to several thousand pieces, involving tens of thousands of lines. Therefore, the electrical connector in addition to meet the general performance requirements, the particularly important requirement is that the electrical connector must reach a good contact, reliable, easy maintenance, the reliability of its work directly affect the normal work of the aircraft circuit, involving the entire host safety. To this end, the host circuit on the quality and reliability of electrical connectors have very stringent requirements, but also because of the high quality and high reliability of electrical connectors, it is also widely used in aviation, aerospace, defense and other military systems.