Final answer:
Cable companies generally allow customers to self-install high speed data services, as technology has evolved to facilitate this ability. Traditional telephony and more complex systems like home automation and security usually require professional setup.
Step-by-step explanation:
Most cable companies will allow customers to self-install high speed data if they already have active service. Traditionally, services like telephony were provided over wires, and companies such as AT&T had monopolies over these services. However, with advancements in technology, specifically microwave transmission, satellite communication, and other wireless technologies, more competition has entered the market, leading to a variety of options for consumers and allowing for self-installation capabilities.
Home automation and home security typically require professional installation due to the complexity and the need for integration with various systems within the home. Meanwhile, telephony has evolved with technology, now often provided over the internet rather than traditional wired systems, but it is not typically something that cable companies would have users self-install.
Thus, with improvements in technology granting consumers more choice and better-quality service, cable companies tend to support the self-installation of high-speed data services, which can include both internet access and VoIP telephony, delivered over their existing cable infrastructure, facilitating quick and convenient access to data services.