Types of Transmission
Data transmission can happen in different ways (analog or digital), can use different controlling schemes (synchronous or asynchronous), and can use either one sole channel over a wire (baseband) or several different channels over one wire (broadband). These transmission types and their characteristics are described in the following sections.
Analog and Digital
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Analog transmission signals are continuously varying electromagnetic waves that can be carried over air, water, twisted-pair cable, coaxial cable, or fiber-optic cable. Through a process of modulation, data are combined with a carrier signal of a specific frequency. The modulation of a signal differs in amplitude (height ...