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The famous Strowger electromechanical switches, first the 2000-type in the 1930s and the 4000-type in the 1960s, were the basis of telephone exchanges. However they were slow, working in real time with 0.1-second pulses from the subscriber's dial, and consumed a lot of power, plus they needed a lot of maintenance. One exchange I worked in had about 80,000 lines and used about 100 kW of power at 50 volts in the morning busy-hour. And all exchanges had to have a battery to keep them going for 24 hours in an emergency.

A 10,000-line exchange can't be explained in ten lines with such a wide variation in readers' prior knowledge.

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