HYBRID COMMUNICATION SOLUTION

A Hybrid Communications Solution Involving Fiber Optics and Satellite Technology

Introduction

Hybrid Communication solutions are the latest technological systems designed to enhance the process of communication. These systems are not only efficient but the quickest medium for sending and receiving communicable data. The data here stands for the internet packet data or multimedia data. Hybrid communication solution comprises of a fiber optic cable system and a satellite network (Samaan, 2008). Going into the history of network communication, we can identify that cable networks have been created for television distribution. In their realization old, analog television broadcast there was no return path. Digital technology has imposed the renewal of this architecture to allow interactivity and provide four simultaneous services: telephone, Internet access, television distribution in high definition, while preserving, on specific frequencies, the Distribution classic analog radio, and television. This new architecture has given rise to a distribution technique that combines optical fiber and coaxial and satellite networks (hence the name hybrid fiber coax, HFC and satellite network) (Prasad et. al, 2000).

Distribution HFC

It uses a star architecture coaxial cables made of small pockets that serve subscribers whose number is between 500 and 2700. The center of the star converts optical signals into digital signals and vice versa. It broadcasts through cable modems services from service providers and collection management information using a pair of optical fibers. This structure helps rehabilitate former analog television broadcast networks and open to the new range of digital interactive services (Prasad et. al, 2000).

The coaxial cable distribution are a type of Ethernet network, the specific frequency bands are allocated to each direction of transmission and for well-defined services, according to the principles of modulation described in the standards. The standard cable modems has been established under the acronym DOCSIS (Data Over Cable Service Interface Specification), and drawn through the center of research and development of a group of American industrial north and south, called " Cable Television Laboratories "(or Cable Labs), with the help of MCNS (Multimedia Cable Network System). DOCSIS attributes the rising and falling rates cooperages available on coaxial depending on services needed and the signals. Such networks broadcast analog TV programs, broadcast programs on FM as well as interactive applications (digital pay television and subscription, public telephony, Internet access, etc.). The technique of cable networks is broadcast in North America and the standards owners have been very many so far. In Northern Europe, a number of cable networks were built, including the "Numeric able" in France (Tarbouriech et. al, 2005).

Discussion

Standards for Hybrid Communication

Three DOCSIS standards have been defined. Version 1.0 has not been fortunate enough to achieve unanimity on heterogeneous networks. Version 1.1 burgeoning birthplace of the development of version 2.0 and version 3.0 is finally available. A bandwidth of 6 MHz, the flow amounts to 320 kbit / s to 10 Mbit / s and downlink streams at 27 or 36 Mbit / s are modulated 16, 64, and 256 QAM and QPSK. A standard, adapted to the requirements of European TV ...