Final answer:
In broadcast technology, sharing a channel can lead to interference, whereas partially overlapping networks manage interference better. Historically, networks used transmission towers to reach viewers, but cable and fiber optics have lessened this dependence. In TV, networks often have the final say in casting decisions.
Step-by-step explanation:
Regarding network transmission, sharing a channel typically refers to a single frequency being used by multiple networks for broadcasting.
This can lead to interference and decreased quality of service. On the other hand, partially overlapping networks may have less interference, as the overlap is not complete, but they still must contend with managing the interference that does occur.
Historically, networks required local affiliates to broadcast their signal using transmission towers, which had a limited radius, to reach viewers.
With the advent of cable and fiber optic technology, the reliance on aerial signals has diminished, though some viewers continue to use antennas and receivers.
In television, casting decisions often culminate with the network having the last word on the final selections.
This scenario reflects the evolution of broadcast technology and the organizational structure of television networks. Understand the context of technology in media is essential for grasping the decisions surrounding channel sharing versus overlapping networks in present times.