The 7 Best Technologies Of The Colour Television

Multimedia services in terrestrial cable

Cable TV (television) networks to provide TV channels households subscribe to cable TV television. Digital television broadcasts using UHF and VHF from 47 MHz to 862 MHz Each channel occupies 6 MHz of bandwidth and modulation with QAM 64/128/256-bit before merging with all other channels of cable television header. Coaxial cables are used to deliver RF TV subscriber households. The band frequencies below 47 MHz is used to carry the return traffic path of cable television subscribers header.

For the TV network cable and the provision of broadband data, a set of standard interfaces cable communication networks and support the operations of the target resource = "_new"> DOCSIS (Data Cable Service Interface Standards) are 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 operators to provide Internet access up to 36 Mbps downstream in its HFC (Hybrid Fiber Coax) networks. Version 1.1 adds QoS (Quality of Service) the ability to allow cable television networks to deliver voice and streaming services (IP multicast). Version 2.0 improves the upload speed (30 Max Mbps) with 64 QAM modulation and 6.4 MHz bandwidth channel upstream to the growing demand for symmetric services (eg IP telephony). DOCSIS 3.0 increases significant download speed (160 Mbps) and upload speed (120 Mbps), multi-link upstream and downstream channels. Release 3.0 also introduces support for IPv6.

PacketCable cable is another area of standards developed to provide packet voice, video and other services multimedia broadband HFC cable networks. PacketCable is a set of protocols developed to provide communications service quality transmission services using packet data to the home of a consumer in the cable network. PacketCable network architecture to support toll quality target = "_new"> VOIP (Voice over IP) and allows the connection of an analog phone using a simple Embedded Multimedia Terminal Adapter (EMTA). It supports primary and secondary residential voice line with a battery backup capability. PacketCable QoS operational capacity of DOCSIS 1.1/2.0 and SIP (Session Initiation Protocol) version 2.0. While the first offer services for the product range PacketCable voice packets and video packets, long-term encompasses a large family of packages of services such as virtual private network (VPN) real-time interactive video sessions, games, mobile multimedia, interactive and multimedia streaming.

The two main components are the DOCSIS Cable Modem (CM) of the subscriber premise and the cable modem Termination Systems (CMTS) at the head cable operator. DOCSIS specifies physical and MAC layers of communication interfaces between the CM and CMTS. PacketCable networks use IP as a basis for robust multimedia architecture. PacketCable architecture supports functions from start to finish, including signaling services, transportation levels of service of variable quality, safety, client device provisioning, billing, network management and others. PacketCable VoIP phone service uses a managed IP network, rather than the public Internet to carry voice traffic. PacketCable specifications for Voice over IP (VoIP) describe basic functions that are normally grouped into one class 5 switch office. These functions can be deployed across multiple elements or may be consolidated into a single element, leading to a low-cost, highly flexible and scalable distributed architecture.

With the deployment of the architecture DOCSIS and PacketCable, cable operators can become service providers complete triple play voice, data and multimedia services. Cable operators can also use its cable network to provide services such as remote management and diagnostics CableHome network client (router, firewall, network address translation, software downloads insurance, etc.) and other devices.

About the Author

Paul Ngai, P.E. is an engineering consultant specialized in Telecommunications Network and Systems. He is also the principal of Network Systems Technologies LLC (http://www.nstecs.net), a telecommunications consulting firm provides planning, analysis, design, testing and operation support services.

DLNA home network set up with twonky media.