ox contains three subcomponents: the DSG-capable cable modem, also called the DSGeCM Table 12.3 DOCSIS Bandwidth Comparison Bandwidth DOCSIS 1.0 DOCSIS 1.1 DOCSIS 2.0 DOCSIS 2.x DOCSIS 3.0 Downstream Bandwidth Per channel 40Mbps 40Mbps 40Mbps 40Mbps 200Mbps Per node 5Gbps 5Gbps 5Gbps 5Gbps 6.3Gbps Upstream Bandwidth Per channel 10Mbps 10Mbps 30Mbps 30Mbps 100Mbps Per node 80Mbps 80Mbps 170Mbps 170Mbps 450Mbps Chapter 12 Broadband Access Alternatives (embedded cable modem); the actual data consumer, called the DSG client; and the DSG client controller, which configures and controls the DSGeCM. The DSG specifi- cation applies equally to all versions of DOCSIS. PacketCable CableLabs created PacketCable (www.packetcable.com) to define standards for the cable TV industry. The PacketCable initiative aims to develop interoperable inter- face specifications for two-way cable networks in order to deliver advanced real- time multimedia services. PacketCable interconnects three networks, including the HFC access network, the PSTN, and IP networks. PacketCable networks, built on top of DOCSIS 1.1 or higher, use IP to enable various multimedia services, includ- ing IP telephony, videoconferencing, multiparty game playing, and other multimedia applications. By using a single high-speed, QoS-enabled broadband architecture, a DOCSIS 1.1 or 2.0 network with PacketCable extensions allows cable operators to economically and efficiently deliver data and voice traffic. The PacketCable architecture relies on several key protocols. First is DOCSIS, which is the standard for data over cable and details the radio frequency (RF) band. For media transfer, Real-Time Transport Protocol (RTP) and Real-Time Transport Control Protocol (RTCP) are required. The signaling protocols include PacketCable Trunking Gateway Protocol (TGCP; a PSTN gateway call signaling protocol specification), which is an MGCP extension for media gateways, and the Network-Based Call Signaling (NCS) protocol specification, which is an MGCP extension for analog residentia