cable television (TV) networks to offer television channels television households Cable TV subscription. Digital TV with VHF and UHF frequencies from 47 MHz to 862 MHz. Each channel occupies 6 MHz bandwidth and modulated with QAM 64/128/256 before combining with all other channels at the head of cable TV. Coaxial cables are used to deliver TV signals in the HF-subscriber households. The frequency band below 47 MHz is used to carry traffic back from participants at the forefront of cable TV.

to provide for the cable television network broadband data, a number of interface cable communication network and support standards of operations, called DOCSIS (Data Standards Cable Service Interface) developed by the cable industry. There are four versions of DOCSIS versions 1.0, 1.1, 2.0 and 3.0. DOCSIS 1.0 allows cable television operators and Internet access for up to 36 Mbps Downstream over their HFC (Hybrid Fiber Coax) networks. Version 1.1 adds QoS (Quality of Service) on the ability of cable TV networks to offer voice services and enable streaming (IP multicast). Version 2.0 improved upstream speed (30 Mbit / s maximum) 64-QAM and 6.4 MHz upstream channel to accommodate increased demand for symmetric services (eg IP telephony). DOCSIS 3.0, a significant increase in the downstream speed (160 Mbps) and upload speeds (at 120 Mbps) by the insertion of several channels upstream and downstream. Version 3.0 include support for IPv6.

PacketCable standard is developed, another cable industry to provide packet voice, video and other multimedia services over broadband HFC cable systems. PacketCable is a set of protocols developed, enhanced QoS provide communications services using the transmission packet data to a consumer at home over the cable network. be PacketCable network supports high-quality architecture with no VOIP (Voice over IP) and services used to an analog phone with a simple embedded multimedia terminal adapter (EMTA) to connect. It supports primary and secondary residential voice with a capacity of batteries. PacketCable QoS operating capacity of DOCSIS 1.1/2.0 and support SIP (Session Initiation Protocol) in version 2.0. While the service offers original PacketCable product line are Packet Voice and Packet Video, the term encompasses a large family of packet-based services such as Virtual Private Network (VPN), video sessions in real-time interactive multimedia telephony, interactive games and media streaming.

Both are key components of DOCSIS cable modems (CM) in the case of the subscriber and the cable modem termination system (CMTS) at the top of the cable operator. DOCSIS specifies the physical and MAC layer communication interface between CM and CMTS. PacketCable networks use IP as the basis for robust multimedia architecture. PacketCable architecture supports all features, including signaling for services, media transport to a level of variable quality of service, security, procurement of the customer, billing and other network management functions. PacketCable VoIP phone service uses a managed IP network, rather than the public Internet to transport their voice. PacketCable specifications for Voice over IP (VoIP) describe the basic functions that normally grouped together on a single Class 5 switch office. These functions can be implemented across multiple elements or a single element that leads to low cost, highly flexible, scalable, distributed architecture can be combined.

With the deployment of DOCSIS and PacketCable network architecture can be cable operators a full-service provider of “triple play” of voice, data and multimedia services. Cable operators can (have router, firewall, Network Address Translation, download software security, etc.) use their cable network to cable services such as home control, remote management and diagnostics of customers home network and other devices.


Coaxial cable