Question: In a DOCSIS IP-CAN, which entity fulfils the role of Policy and Charging Enforcement Function (PCEF) and is responsible for providing IP connectivity, traffic scheduling, and managing Quality of Service (QoS) for connected User Equipments (UEs)?
Option 1: Application Manager (AM)
Option 2: Policy Server (PS)
Option 3: User Equipment (UE)
Option 4: Cable Modem Termination System (CMTS)
Explanation: In the context of a DOCSIS IP-CAN, the CMTS (Cable Modem Termination System) acts as the PCEF. This is because it provides critical functions such as IP connectivity for the Cable Modems (CMs) and their associated UEs, schedules traffic over the Hybrid Fibre Coax (HFC) access network, and manages QoS for both the CMs and subtending UEs, aligning with the responsibilities of a PCEF in telecom networks.