Why is it crucial for a channel plan to prevent two adjacent access points from using the same channel?

The importance of a channel plan that prevents two adjacent access points from using the same channel lies in the reduction of co-channel interference. When two access points operate on the same channel in close proximity, they can interfere with each other's signals, leading to reduced performance in terms of data transmission quality and speed. This interference occurs because the access points transmit and receive signals on the same frequency, causing confusion and data loss.

By ensuring that adjacent access points utilize different channels, the communication environment remains clearer, resulting in improved signal strength and reliability. This practice is particularly vital in environments with high user density, where many devices are competing for limited bandwidth. Ultimately, by avoiding co-channel interference, the network can function more efficiently, offering a better experience for all users.