What are some aspects of the definition of a connector?

I. What is the definition of a connector? A connector is a motor system that provides a separable interface between two sub-electronic systems without unacceptable effects on the operation of the systems. The key words in the definition are "motor system", "separable" and "unacceptable". A connector is a motor system because it is an electrical connection made by mechanical means. As will be discussed, a mechanical spring bias creates a force between the two mating parts, which makes metallic contact between the mating surfaces of the interface. The reason for applying connectors in the primary place is that the mating interface is separable. Separability is necessary for many reasons. It allows parts or subsystems to be manufactured independently and final assembly to take place in one main location. Separability also allows maintenance or upgrading of parts or subsystems without modifying the overall system. Another reason for the application of separability is portability and support for peripheral expansion. On the other hand, separability by definition introduces an additional interface between the subsystems that must not introduce any "unacceptable effects", in particular on the characteristics of the system, such as unacceptable distortions and degradations of signals between the systems, or loss of power through the connectors. Power loss in terms of millivolt loss will become a major design criterion for functionality, and therefore the power requirements of the motherboard will increase. The need for separability and the limits of "unacceptability" will depend on the application of the connector. Separability includes the number of mating cycles, which is the amount of force a connector must provide without compromising its performance, and the force necessary to mate with another connector. Typical mating cycle requirements range from tens of cycles for internal connectors to thousands of cycles for peripheral devices such as PCMCIA type connectors. As the number of circuits or functions and connector interconnections increase, the need for mating forces becomes even more important. In order to provide more functionality, the number of terminal positions on the connector must also increase, which results in higher connector mating forces. Depending on the use and function of the connector, the number of terminals varies from tens to thousands.

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