71.   The second generation refers to current digital wireless networks.

72.   The services are called ISDN, for integrated services digital network, and ADSL, for asymmetric digital subscriber line.

73.   The Rosetta system does not have the ability to learn from prior experience, as some digital neural networks can do.

74.   There is no single reason, but part of the answer is that the area is wired for intergrated services digital network.

75.   These lines, known as integrated services digital network or ISDN, allow people to get faster access to the Internet global computer network than traditional copper phone lines.

76.   They will also work on both a cellular and PCS digital network that uses time-division multiple-access technology, the company said.

77.   They argue that carriers will be loathe to spend money to build extensive digital networks in small, rural areas where analog now operates.

78.   This makes the network more resistant to large-scale failures and reduces the capacity requirements for the digital networks that will carry data, voice and video.

79.   Two-way television, available through new digital networks, lets viewers use TVs to order products, send e-mail and even change the outcome of shows.

80.   Vodafone and Cellnet are now moving their analog customers to newly-built digital networks.