Which technology is specifically designed for broadband transmission of telecommunications signals?

The technology specifically designed for broadband transmission of telecommunications signals is Asynchronous Transfer Mode (ATM). ATM is a networking technology that transmits data in fixed-size cells, which allows for efficient and predictable transfer of different types of traffic, such as voice, video, and data. Its design supports high-speed connections and is particularly effective for managing variable bandwidth requirements, making it suitable for broadband applications.

While Asymmetric Digital Subscriber Line (ADSL) does provide broadband access specifically over telephone lines, it is more focused on delivering internet services rather than being a broad telecommunications signal transmission technology. Audio Frequency (AF) relates to the range of sound frequencies and is not directly applicable to telecommunications data transmission. The term Automated Teller Machine (ATM) refers to a banking kiosk and is not related to telecommunications technology.

Thus, Asynchronous Transfer Mode stands out as the option that directly pertains to the broadband transmission of telecommunications signals, with its ability to efficiently handle various types of data traffic over a network.