ternet is upgraded to handle more traffic. Most of the disadvantages of cable data systems the result of legacy issues within the CATV systems. However, the cable companies were aware of these disadvantages before they got into the business, and they know how to overcome the problems. The solutions to the most of the problems of cable data networks are known. But, it will take a great deal of money to implement these solutions. The MSOs have invested already invested billions in creating cable data networks, and they are willing to invest more to remain competitive with the telephone industry. The biggest legacy issue induced problem facing cable modem technology is that CATV systems were originally designed to carry TV programming from the cable operator to the subscribers home. The CATV systems were never intended to be used for two-way or point-to-point communications. The MSOs have the capability to upgrade their systems to deliver two-way data communications by switching to HFC plant, but there are no easy solutions to the point-to-point communication dilemma. The tree and branch configuration of a CATV system is not conducive to point-to-point communication. There was no need for sophisticated switching systems, like those used in a telephone system, when the CATV systems were first developed. Unfortunately for the MSOs, a switching network is essential for point-to-point communication. Another disadvantage of cable data systems is slow upstream communication. But, fortunately for the MSOs, the high-speed telephone data technologies also have this problem. The root of the problem is that CATV systems were primarily designed for downstream delivery of TV programming. So, the majority of the coaxial cable bandwidth of a CATV system was dedicated to downstream traffic. There was very little bandwidth set aside for upstream traffic. To further complicate matters, the cable modem manufacturers are making their produ...
