inks carrying calls between exchanges may be symmetrical pair cable, quad cable, coaxial cable, optical fiber cabled. The choice of medium depends upon bandwidth or traffic volumes to be carried, the distance and terrain to be covered, the performance required, the distribution of the traffic and the cost. Interexchange transmission system in the past were analog but are now being superseded by digital systems.Technological developments are reducing cost and improving the quality of service. Optical fiber cable is particularly suited for high capacity routes, leaving longer distances between repeaters, further reducing cost and increasing reliability. Optical fiber cable will be replacing coaxial and quad cable systems as the preferred medium. Microwave systems are particularly suitable for medium and high capacity routes in inhospitable terrain. Coaxial or optical fiber submarine cable is also an economic choice in numerous cases for long distance or international transmission.There are many advantages of digital switching and transmission. Such a network carries data traffic as easily as voice traffic and therefore is used by many types of service. The result is economies of scale and resilience when traffic on particular services peaks. The computers within exchanges monitor and control the behavior of the network as a whole system and open up new capabilities and techniques of operation. The flexibility of digital systems also simplifies the physical design of networks so that the limitations on serving large areas from a single exchange are reduced. KTA hopes to digitalize all phone lines by the year 2005. CHAPTER 2:MediaOne specific industry that was directly in the reigns of the Korean government was the media. The communications media in South Korea was under the dictatorial governmental press control. This changed in 1987. A major historical Declaration released the media from this tight hold. Future Korean Presi...
