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1
Chapter 1
Introduction
1.1 An Overview of Billion mini USB
ISDN TA128
1.1.1 What is ISDN?
ISDN is an abbreviation for Integrated Services Digital Network.
ISDN transfers information digitally and integrates all
telecommunication services (such as telephone, teletext,
videotex, etc.) into a single network. Using ISDN, you can
transfer text, voice, data files, images, and even video.
Before the use of ISDN, telecommunications operated using
analog devices, which limited the quality of telecommunication
transfers. With ISDN technology, the telephone lines can
transmit data digitally with much greater speed and clarity of
transmission than with analog transmissions. The ISDN is
capable of transmitting all kinds of information at greatly
accelerated rates. A typical modem transmission has a rate of
56Kbps (kilobits per second or thousand bits per second). ISDN
digital technology allows transfer rates of up to 128Kbps.
Because ISDN transmits data digitally, the data is virtually error
free, and the transmission is much clearer, with fewer
interruptions and slowdowns in facsimile transmissions. With