PacketCable was designed to deliver real-time IP applications with the same level of quality as circuit-switched technology delivered for POTS.

PacketCable was designed to deliver real-time IP applications with the same level of quality as circuit-switched technology delivered for POTS.

• A. It provides real-time IP applications with the same QoS as POTS
• B. It eliminates the need for QoS
• C. It delivers only data services
• D. It requires the Internet for all speech packets

Answer: (A)

Quality of service guarantees for real-time voice over IP in a cable network are what PacketCable is designed to provide. The idea is to deliver voice and other real-time IP applications with the same level of reliability, latency, and continuity that circuit-switched POTS offered. To make this possible, PacketCable uses prioritized handling of voice traffic, reserved bandwidth, and control mechanisms across the DOCSIS/IP network so voice packets arrive with low latency, minimal jitter, and low loss. This is what lets VoIP providers offer POTS-like performance over cable. Eliminating QoS would undermine real-time performance, so that option isn’t correct. PacketCable isn’t only data services; its whole purpose is to support real-time voice over IP, not just data. And speech packets don’t have to traverse the public Internet for every call—PacketCable relies on the operator’s managed network with QoS, rather than requiring Internet access for all speech packets.

Quality of service guarantees for real-time voice over IP in a cable network are what PacketCable is designed to provide. The idea is to deliver voice and other real-time IP applications with the same level of reliability, latency, and continuity that circuit-switched POTS offered. To make this possible, PacketCable uses prioritized handling of voice traffic, reserved bandwidth, and control mechanisms across the DOCSIS/IP network so voice packets arrive with low latency, minimal jitter, and low loss. This is what lets VoIP providers offer POTS-like performance over cable.

Eliminating QoS would undermine real-time performance, so that option isn’t correct. PacketCable isn’t only data services; its whole purpose is to support real-time voice over IP, not just data. And speech packets don’t have to traverse the public Internet for every call—PacketCable relies on the operator’s managed network with QoS, rather than requiring Internet access for all speech packets.