Systems
Wire spring relays were also incorporated into the signaling channel units of carrier systems.
For the Stored Program Control exchanges of the early 1970s, many relays were made with steel cores that remained magnetized after current ceased to flow in the winding. This "magnetic latching" feature, different from the use of slugs to delay relay operation, was used in the arrays of reed relays that switched connection paths in the early models of Electronic Switching Systems. A miniature wire spring relay was also produced, starting in approximately 1974 as part of the 1A redesign of the 1ESS switch.
Manufacturing of wire spring relays greatly declined in the late 20th century due to the introduction of digital electronic switching systems that used them in very small numbers.
Read more about this topic: Wire Spring Relay
Famous quotes containing the word systems:
“We have done scant justice to the reasonableness of cannibalism. There are in fact so many and such excellent motives possible to it that mankind has never been able to fit all of them into one universal scheme, and has accordingly contrived various diverse and contradictory systems the better to display its virtues.”
—Ruth Benedict (1887–1948)
“The skylines lit up at dead of night, the air- conditioning systems cooling empty hotels in the desert and artificial light in the middle of the day all have something both demented and admirable about them. The mindless luxury of a rich civilization, and yet of a civilization perhaps as scared to see the lights go out as was the hunter in his primitive night.”
—Jean Baudrillard (b. 1929)
“Our little systems have their day;
They have their day and cease to be:
They are but broken lights of thee,
And thou, O Lord, art more than they.”
—Alfred Tennyson (1809–1892)