What did the 1.1 version of DOCSIS introduce for real-time data applications?

DOCSIS 1.1 introduced PacketCable, which is a standard that facilitates the delivery of real-time data applications such as voice over IP (VoIP) over cable networks. This technology was crucial for enabling high-quality, low-latency services that require fast and reliable internet connections. PacketCable allows for necessary quality of service (QoS) features that prioritize voice and video traffic, ensuring that these real-time applications function seamlessly without interruptions.

In contrast, the other options do not specifically pertain to the advancements made in DOCSIS 1.1 regarding real-time data applications. "Direct Cable Programming" does not align with real-time applications, while "Advanced Digital Transmission" is a more general concept and does not focus on the specific framework for real-time data. "Real-time Data Network" could be misinterpreted broadly, but it lacks the specificity that PacketCable provides in terms of establishing a standardized method for real-time communication over cable systems. Thus, PacketCable is the correct answer because it directly addresses the innovative capabilities introduced in DOCSIS 1.1 for handling real-time applications.