When delivering high-speed Internet service, the cable modem communicates with which system?

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When delivering high-speed Internet service, the cable modem communicates with the Cable Modem Termination System (CMTS). The CMTS is a critical component of a cable broadband network, acting as the central point where multiple coaxial cable connections from subscribers converge. It is responsible for managing the communication between individual cable modems and the Internet.

The CMTS performs several key functions, including routing data signals to and from cable modems, managing bandwidth allocation, ensuring Quality of Service (QoS), and providing access to various Internet services. It converts data packets from the Internet into a format suitable for transmission over the coaxial network to the individual cable modems.

The other options, while related to the infrastructure of cable systems, do not directly serve as the communication interface for the cable modem. The optical distribution network typically refers to the fiber-optic components used for transmitting signals over longer distances, the headend system encompasses the broader station for managing multiple services, and a signal processing unit is more about handling specific signal functions rather than serving as a direct communication point like the CMTS. Thus, the cable modem primarily relies on the CMTS for establishing Internet connectivity.

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