Multimedia services over cable Terrestrial Television Networks

Cable television (TV) provide network TV broadcasts of TV channels on cable TV subscriber homes. Digital TV broadcasts with VHF and UHF frequencies between 47 MHz to 862 MHz. Each TV channel occupies 6 MHz bandwidth and QAM modulated 64/128/256 before combined together with all other channels on the cable TV headend. Coaxial cables are used to deliver the TV-RF signals to the subscriber homes. The frequency range below 47 MHz is used to perform back-channel traffic from the subscribers to the cable TV headend. In order for the TV cable network to deliver high-speed data services, call a number of communication interface cable network and operating standards DOCSIS (Data Over Cable Service Interface support standards) are developed by the cable industry. There are four versions of DOCSIS, versions 1 0, 1 1, 2 0 and 3 0th DOCSIS first 0 enables cable TV operators, Internet access for up to 36 Mbps Downstream over their HFC (Hybrid Fiber Coax) networks. Version 1 Adds a QoS (Quality of Service) function to enable cable TV networks for both voice and streaming services (IP multicast). Version 2 0 increased the upstream speed (30 Mbps maximum) with 64-QAM modulation and 6 4 MHz bandwidth upstream channel to accommodate increased demand of symmetric services (eg IP telephony). DOCSIS third 0 significant increase in the downstream speed (up to 160 Mbps) and upstream speed (120 Mbps) by bonding multiple channels upstream and downstream. Version 3 0 also the support for IPv6. PacketCable is another cable industry standards designed to offer packages of voice, video and other high-speed multimedia services based on HFC cable systems. PacketCable is a set of protocols developed to QoS for advanced communication services, packetized data transmission to a consumer at home over the cable network. PacketCable network architecture to support toll quality VOIP (Voice over IP) services, and allows you to connect an analog phone plain with an embedded multimedia terminal adapter (EMTA). It supports primary and secondary residential voice line with battery backup function. PacketCable uses QoS capabilities of DOCSIS first 2.1. 0 and is SIP (Session Initiation Protocol) version 2 supports. 0th While the first service offerings for PacketCable product line Packet Voice and Video Packet, the long-term goal includes a large family of packet-based services such as Virtual Private Network (VPN) are, interactive real-time video sessions, multimedia, telephony, interactive games and media streaming. The two main components in the DOCSIS Cable Modem (CM) in the subscriber premise and the cable modem termination system (CMTS) in the cable operator headend. DOCSIS specifies the physical layer and MAC communication interfaces between CM and CMTS. PacketCable networks use IP as the basis for robust multimedia architecture. PacketCable architecture supports end-to-end functions, including signaling for services, media transport to variable levels of QoS, security, deployment of the client device, billing, network management and other functions. PacketCable VOIP phone service instead of using a managed IP network can cause the public Internet terminal, their voice traffic. PacketCable specifications for Voice over IP (VoIP) describe the basic functions that are typically a single class 5 central office switches consolidated. These functions can be implemented across multiple elements or can be a single element that leads a low-cost, highly flexible, scalable, distributed architecture to be consolidated. With the introduction of DOCSIS and PacketCable network architecture that allows cable operators a full-service provider of triple play voice, data and multimedia services. Cable operators can also offer its cable network to the Cable Home services such as remote control, management and diagnostics of customers home network (router, firewall, Network Address Translation, secure software download, etc.) and other devices.