The Fight for Customers: Telephone's Second Chance

Telephone companies have long envied the profits cable-television firms make by delivering television programs into homes. But this was a business that seemed impossible for them to enter. Most telephone networks run on twisted copper wires. Even the fastest modems, signals on these wires were interrupted by too much noise to carry much more than still pictures and text.

The trick is to use fast computer chips called digital signal processors to test each line constantly and then a tailor the data to travel only over the frequencies that are clearest at any time. With such a chip on each end of line telephone companies found they could increase the capacity of their old wires thousands of times-enough to deliver high quality video pictures.

Many firms, notably Bell Atlantic in America and BT in Britain, bought these boxes called asymmetric digital subscriber line (ADSL) modems, to try their hand at the media mania of the moment, interactive television. But subscribers turned out to be a lot less interested in this than the telephone companies were. Trials suggested that they would not pay enough to cover the cost of the expensive equipment. ADSL looked like another technology that cost too much and offered too little.

Recently two things have rekindled ADSL's flame. First, in America, Congress has opened the local telephone markets to competition, confronting Bell Atlantic & co. The second change is the rise of the Internet. Consumers may not have been wowed by interactive television, but it seems that they cannot get enough of the Internet. The telephone companies reckon that many people would pay a lot for high-speed Internet access. Five of America's Bell companies have all announced trials using ADSL to deliver high speed Internet access.

ADSL is ideal for providing high-speed Internet access to consumers in many other respects. ADSL modems are permanently connected, eliminating trial some delays. ADSL bypasses all that with a direct digital connection, keeping prices down for both customers and the telephone companies.