12Communication systems



12.1 Introduction

The approach taken here must necessarily be broad and must include in principle any system which can deliver data over distance. There appears to be an unwritten rule that anything to do with communications has to be described entirely using acronyms; a rule which this chapter intends to break in the interests of clarity. Figure 12.1 shows some of the ways in which the subject can be classified. The simplest is a unidirectional pointto- point signal path shown at (a). This is common in digital production equipment and includes the AES/EBU digital audio interface and the serial digital interface (SDI) for digital video. Bidirectional point-to-point signals include the RS-232 and RS-422 duplex systems. ...

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