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Handbook of Serial Communications Interfaces by Louis E. Frenzel

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Chapter Sixty-Three

Broadband Interface Concepts

The interfaces covered in the previous chapters put the serial binary voltages directly on the cable. This approach is known as baseband operation. Another method of transmitting serial data is to use broadband methods that employ modulation. The serial binary data is used to modulate a higher frequency carrier signal that is then transmitted over the cable. This chapter is a general introduction to the modulation methods used. Chapters summarizing the most widely used broadband interfaces follow.

The Rationale for Modulation

Applying the high-speed binary signals directly to the cable causes the signals to be greatly influenced by the characteristics of the cable. The cable is a transmission line ...

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