Final answer:
Cable networks, such as CNN, engage in multiplexing to transmit multiple channels from one network.
Step-by-step explanation:
Cable networks, such as CNN, that can transmit multiple channels from one network engage in multiplexing. Multiplexing is a technique that allows multiple signals to be combined and transmitted on a single channel or line. In the case of cable networks, multiplexing allows them to send multiple channels over the same cable, increasing the efficiency of the network. Cable networks such as CNN that can transmit multiple channels from one network engage in a process known as multiplexing. This technique allows multiple signals or channels to be combined and carried over a single physical medium. For instance, a cable television network can transmit numerous channels of video content over a single coaxial or fiber optic cable to consumers. This is different from traditional broadcast television where each channel would have required its own frequency band. Cable networks can operate across the nation directly without needing local affiliates. They purchase broadcasting rights for the stations they want in their lineup, enabling a wide variety of specialized programming. CNN was a pioneer in such specialization by becoming the first 24-hour news station. Cable technology thus reduces reliance on aerial signals and towers that were previously needed to reach viewers through local affiliates. This resulted in growth in niche programming aiming at specific audiences, which broadened options for marketers and advertisers.