Telecommunications allows people around
the world to contact one another, to access
information instantly, and to communicate from
remote areas. Telecommunications usually
involves a sender of information and one or more
recipients linked by a technology, such as a
telephone system, that transmits information from
one place to another.Telecommunications devices
converts different types of information, such as
sound and video, into electronic signals. The
signals can then be transmitted by means of media
such as telephone wires or radio waves.
第三页,共36页。
第三页,共36页。