Automation in switching equipment engineering

The general telephone Company of California is presently the largest operating company within the General Telephone System. Its major operating territories embrace the Los Angeles metropolitan area and include important exchange areas situated in other sections of central and southern California. For many years, this company has standardized on the use of step-by-step switching equipment manufactured by the Automatic Electric Company. Included in our operating areas at this time are 37 exchanges which are served by a total of 70 step-by-step central offices. These offices vary in size from small terminal per-line installations of 200 lines to large multiunit offices of 43,000 terminals.