Abstract:
With the social development, man has come to require
more comfortable and convenient life. As one of
the modern conveniences, the telephone was born to
enable man to communicate with other persons in
faraway places, that is to say, to transmit one's natural
voice instead of talking to their faces. Nowadays, even
a day's life is unthinkable without telephone, therefore,
the manufacturing technology of communications
line has much developed. The communications line is
a product widely used not only in telephone talks but
also in the industrial field requiring information transmission.
Such a communications line is the very recent
communications cable.
