True, wireless links and physical connections are the only two types of communication routes.
What are Communications Channels?
There are two types of electrical communication channels: wired and wireless.
With wireline channels, the transmitter and receiver are physically connected by a "wire," which could be an optical fiber, coaxial cable, or twisted pair. As a result, wireline communications are far less susceptible to interference and are more private.
A transmitter's antenna emits a signal that can be picked up by any antenna that is sufficiently close, making wireless channels much more open. The antenna of the receiver will respond to electromagnetic radiation emanating from any source, unlike wireline lines where the receiver only receives the signal from the transmitter.
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