21.   And U.S. Robotics Corp., a leading manufacturer of conventional phone modems, announced last week that it would begin producing cable modems.

22.   And with cable modems as well as high-speed services from some telephone companies, those faster connections are becoming available in a growing number of households.

23.   Another big opportunity is cable modems.

24.   Anybody on a cable modem or with DSL ought to consider using some sort of firewall.

25.   Another significant difference between the cable modem and the DSL connection involves security.

26.   As a result, TCI has pulled back on ambitious plans to promote cable modems and telephone service outside a few test areas, including Fremont.

27.   At Home, which sells the service under the Exite At Home brand, is the largest U.S. provider of Internet connectons over cable modems.

28.   At that rate of exchange, ADSL could be a satisfactory alternative to cable modems.

29.   At the customer site, a cable modem or router demodulates the signal and feeds it to a computer or local area network.

30.   At Home links personal computers to the Internet using cable modems, which can send and receive data such as electronic mail.