What type of modulation is typically not used for transport of digital television signals through cable networks?

The choice of Amplitude Modulation (AM) as the answer reflects the fact that it is not typically utilized for the transport of digital television signals through cable networks. In modern cable television systems, digital signals require more robust and efficient modulation techniques to handle the bandwidth and ensure reliable transmission with minimal noise and distortion.

Quadrature Amplitude Modulation (QAM) is indeed a popular choice for digital TV because it allows for the transmission of multiple bits of data per symbol, effectively maximizing data throughput.

Pulse Amplitude Modulation (PAM) can also be used in certain applications and while Binary Phase Shift Keying (BPSK) is used for some digital transmissions, especially in satellite communications, these methods are more suited for digital signals.

In summary, AM is primarily associated with analog broadcasting, which does not provide the efficiency and capacity required for digital television, making it less suitable for cable networks that rely heavily on digital signal delivery.