Cables. Technical reading Transmission lines Write down any types of cable and transmission lines used in telecommunications that you can think of. Now listen to the text to find answers to the following: Why are wires sometimes twisted together in transmission lines?
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Now listen tothe text to find answers to the following:
1,000MHz. It is used to connect telephone exchanges and for cable television.
Although the optical fibre has a smaller diameterthan a human hair, it can be used to transmit tens of thousands of signals at high speed with very low loss and no interference from other signals.
copper wire, copperbraid, trunk telephone lines, cable TV