The paper intrduces the exchange CENTREX, dispatching equipment and the com-bination of them, and puts forward the methods of improving coalmining communication capabili-ty.
These phone switching machines require intense security and they have to run no matter what—after all, if the machines stop working, the phones stop working.
Programming was done by plugging hundreds of wires into plugboards, sort of like old school telephone switchboards, in order to set up the computer to perform the right operations.
In many cases, only the line from the exchange to the on-street cabinet is fibre, with copper still handling the last leg of the journey, limiting speeds.
Another is Charles E. Scribner, who, by his invention of that intricate device, the multiple switchboard, has converted the telephone exchange into a smoothly working, orderly place.
另一是查尔斯·E·斯克里布纳 (Charles E. Scribner), 他发明了复杂的设备, 多路总机,将电话交换机变了一工作顺畅、井然有序的地方。
Having begun life in 1987 selling phone switches from a flat in the southern city of Shenzhen, in 2012 the Chinese technology firm overtook Sweden's Ericsson to become the world's biggest maker of telecoms gear.