What type of communication does the Lower Tier facilitate for users?

The Lower Tier facilitates both voice and data communications, which makes it an essential part of a comprehensive communication system. This tier supports various forms of communication, enabling users to engage in phone calls and transmit data simultaneously. This dual capability is crucial in modern communication networks, as it allows for efficient information exchange and collaboration.

The integration of voice and data enables users to participate in conference calls while sharing relevant documents or presentations, enhancing productivity and responsiveness in various operational environments. In contrast, focusing solely on voice or data communications would limit the flexibility and functionality that users require for effective communication.