SF System: Transistors, Diodes and Components

The choice of passive components and active devices for use in a submarine cable system must often try to satisfy two conflictingdemands. On the one hand, high system performance objectives may call for the use of the most advanced device technology and components. Reliability requirements, however, demand the use of those components and devices which have a proven record of dependable operation in conventional applications, and whose failure modes are understood. Where such conflicts arise, the choice is of necessity weighted in favor of reliability considerations. In this section on components, both active and passive, for the SF System, we cover: (i) the basic types and their functions, with some of the reasons for their choice; (ii) procedures for providing them; (Hi) screening, aging, and selection; (iv) results from experience in providing them; and (v) precautions for assembly into circuits.