Final answer:
High-speed communication channels such as microwave, fiber optics, or satellite transmissions use digital channels for data transmission, as they allow for clearer transmissions and more efficient use of bandwidth.
Step-by-step explanation:
Communications channels such as microwave, fiber optics, or satellite transmission that provide high-speed transmission rates typically use digital channels. Digital transmission involves converting the signal into a sequence of binary ones and zeros for clearer transmission and to allow for compression of digital data, resulting in more efficient use of each frequency range.
Additionally, because of their high frequency, microwaves are quite suitable for communications, capable of carrying more information per unit of time. Optical fiber, yet another high-speed communication channel, uses laser signals to transmit a large amount of data over long distances with low loss and high bandwidth, as well as reduced crosstalk compared to electrical-based systems. Both these technologies utilize digital signals for their transmissions.