CATV Multiple Function Development

The CATV in China has formed the scale development, since the 80s and the beginning of the 90s . The scale of CATV user leapt to the first place in the world at the end of 1997.And up till 2005 there have been 400 million simulations televisions, 115 million CATV users, occupy 1/3 of the world.It will be far from satisfying the enterprise development only by relying on television business when CATV internet develops into certain time. A techonology has appeared since 1999, which is the reconstruction of CATV internet, to set up bidirection of HFC network , the abbrievation of Hybrid Fiber Coaxial internet. This is one kind of mixed type of structure network that subsitute optical fiber for electric cable skeleton line of entire coaxial cable network. Its aim is to expand the network cover scope , enhance the transmission quality of the network and enlarge the transimission function of the network through using the optical fiber`s large capacity and low loss of transmission. Therefore, it has been a siganificant transformation during the development of CATV and a quantitive leap that CATV network has upgraded from entire coaxial net of community scope to HFC network of suburb scope.Many multiple function business will be developed by using HFC bidirectional network of CATV wide band, including wide band internet access, VoIP pronunciation business and so on.As far as the physical link of network is concerned ,the Cable Modem of CATV network has natural wide band superiority by contrast with xDSL of telecommunication network. It uses optical fiber for band width transimission , coaxial cable for the link...