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Communications
CHAPTER CONTENTS
13
13.1 Overview .................................................................................................................................... 328
13.1.1 Whatiscommunication?.......................................................................................328 13.1.2 Evolutionofdatacommunication...........................................................................328 13.1.3 Data networking and ROVs .................................................................................... 329 13.1.4 Transmission versus communication....................................................................... 330 13.1.5 The OSI networking model .................................................................................... 332
13.2 Transmission .............................................................................................................................. 334
13.2.1 Basic data transmission model ............................................................................ 334
13.2.2 Electrical signal transmission .............................................................................. 334
13.2.3 Linecharacteristics............................................................................................339
13.2.4 Metallic transmission media................................................................................ 340
13.2.5 Optical fiber....................................................................................................... 344
13.2.5.1 Enough with the theory! What’s important? .................................................... 350 13.2.5.2 Pay attention—this part is important! ............................................................ 353 13.2.5.3 Troubleshooting fiber-optic systems...............................................................354
13.2.6 Radio................................................................................................................355
13.2.7 The ubiquitous decibel ....................................................................................... 355
13.2.8 Basebandtransmission.......................................................................................358
13.2.9 Modulation........................................................................................................358
13.2.10 Multiplexing.......................................................................................................359
13.2.11 Binary signals .................................................................................................... 361
13.2.12 Directionality.....................................................................................................361
13.3 Communication...........................................................................................................................361
13.3.1 Of bits and bytes .................................................................................................. 361 13.3.2 Data representation .............................................................................................. 362 13.3.3 Error control......................................................................................................... 363 13.3.4 Protocols.............................................................................................................363
13.4 Standard protocols......................................................................................................................364
13.4.1 TIA/EIA standards ................................................................................................ 364
13.4.2 RS-232...............................................................................................................365
13.4.3 RS-422/485........................................................................................................366
The ROV Manual.
© 2014 Robert D Christ and Robert L Wernli. Published by Elsevier Ltd. All rights reserved.
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