Английский для пользователей компьютеров. Ч.2. Белобородова М.Л - 33 стр.

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number of smaller computers and/or terminals, called nodes. The nodes
are not designed to communicate directly with one another, so if the main
computer fails, the whole network "goes down."
In a more complicated star network called a hierarchical, or tree
network, some nodes have devices connected to them in smaller star
networks.
In a bus network, a number of computers are connected to a single
communications line. In this network, if one computer fails, the others can
continue to operate.
A ring network is much like a bus network, except that the
communications line forms a loop. This network has no central computer,
and each computer connected to the network can communicate directly
with the others.
In the token ring network, predefined patterns of bits, or tokens, are
passed from computer to computer. The computer with the token can
transmit; the others can not. This setup prevents the garbling
of messages
that occurs when more than one computer tries to transmit at the same
time.
The business user can benefit from computer-to-computer communications
using a number of public services and utilities to access data and information.
Public databank provide information about such topics as health, education,
law, the humanities, science, and government. To use these databanks, the user
pays a fee plus the regular phone charges. Public information services also
provide the user with such conveniences as electronic shopping and banking,
electronic bulletin boards, and electronic mail.
B
E SURE THAT YOU UNDERSTAND THE MEANING OF THE KEY TERMS:
acoustic coupler
analog signal
(a)synchronous transmission
bus network
concentrator
controller
(de)modulation
digital signal
direct-connect modem
electronic bulletin board
electronic mail
external modem
fiber optics
front-end processor
(full- / half-duplex
hierarchical (tree, star) network 
number of smaller computers and/or terminals, called nodes. The nodes
are not designed to communicate directly with one another, so if the main
computer fails, the whole network "goes down."
   In a more complicated star network called a hierarchical, or tree
network, some nodes have devices connected to them in smaller star
networks.
   In a bus network, a number of computers are connected to a single
communications line. In this network, if one computer fails, the others can
continue to operate.
   A ring network is much like a bus network, except that the
communications line forms a loop. This network has no central computer,
and each computer connected to the network can communicate directly
with the others.
   In the token ring network, predefined patterns of bits, or tokens, are
passed from computer to computer. The computer with the token can
transmit; the others can not. This setup prevents the garbling of messages
that occurs when more than one computer tries to transmit at the same
time.
   The business user can benefit from computer-to-computer communications
using a number of public services and utilities to access data and information.
Public databank provide information about such topics as health, education,
law, the humanities, science, and government. To use these databanks, the user
pays a fee plus the regular phone charges. Public information services also
provide the user with such conveniences as electronic shopping and banking,
electronic bulletin boards, and electronic mail.
BE SURE THAT YOU UNDERSTAND THE MEANING OF THE KEY TERMS:
acoustic coupler
analog signal
(a)synchronous transmission
bus network
concentrator
controller
(de)modulation
digital signal
direct-connect modem
electronic bulletin board
electronic mail
external modem
fiber optics
front-end processor
(full- / half-duplex
hierarchical (tree, star) network

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