Английский для пользователей компьютеров. Ч.2. Белобородова М.Л - 35 стр.

i.          Communications medium that transmits data as pulses of light through
     strands of glass
     j.   Collection of data communications hardware, computers, communications
     software, and communications media connected in a meaningful group to allow
     users to share information and equipment.
          k.       Number of times analog signals repeat over a certain period of
          time
          l. Communications mode in which data is transmitted in two directions
              simultaneously
          m. Data communications hardware component designed to allow two or
              more data transmissions to share a single communications line
          n. Process of converting a digital signal into analog form so that data can
              be sent over the phone lines
          o. Device that allows a microcomputer to communicate with a mainframe
              computer
     3 Choose the most suitable answer:
     1. Which of the following performs modulation and demodulation?
          a. fiber optic
          b. satellite
          c. coaxial cable
          d. modem
         e. e. none of the above
     2. The process of converting analog signals into digital signals so they can be
       processed by a receiving computer is referred to as:
         a. modulation
         b. demodulation
         c. synchronizing
         d. asynchronizing
         e. none of the above
     2. Which of the following communications modes supports two-way traffic
        but in only one direction at a time?
         a. simplex
         b. half-duplex
         c. three-quarters duplex
         d. full-duplex
         e. none of the above
     3. Which of the following might be used by a company to satisfy its growing
        communications needs?
         a. front-end processor