What does 5ESS Switch mean?

5ESS Switch meaning in Computer Science Dictionary

The 5ESS switch, also referred to as the Number 5 Electronic Switching program, is a course 5 phone switching system initially manufactured by AT&T and Western Electrical. It was produced by more than 5000 employees possesses over 100 million outlines of computer system signal. It had been first deployed in Seneca, Illinois on March 25, 1982 and since after that has withstood over two decades of development. These days, about 50 % of most telephone calls in the usa are routed through 5ESS switches.