By D. J. Morris (Auth.)
Presents a close fully-illustrated therapy of the layout of conversation networks for command and keep watch over structures. when protecting the fundamental conception, emphasis all through is positioned upon the sensible features of laptop managed verbal exchange. The verbal exchange community is taken care of as a method, instead of as a suite of things of kit, and strategies are special to judge the worthiness of every block and the issues coming up in interfacing them into the procedure. additionally comprises comparability tables for the choice of blocks for particular reasons. technique of moving facts among a few of the processing issues, their power benefits and attainable defects are appraised and techniques of fixing such difficulties tested. Covers new advances within the fields of packet-switching verbal exchange community, multiple-access verbal exchange strategies, unfold spectrum communique, electronic voice exchanges, optical verbal exchange, and satellite tv for pc verbal exchange
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Additional info for Communication for Command and Control Systems
23 D e f i n i t i o n f o r a c o m m u (or transmit) a given volume of nication node performance data during a specified period of time (see Fig. 23). In most communication systems, the communication equipment is therefore selected according to the average traffic volume flowing through the unit. That is, the volume is first measured by the data buLk that flows through the unit over a relatively long period of time, say an hour or a day, and the result is then divided by a specified short period.
Such a requirement may be unattainable, one must nevertheless strive to achieve it, since any complete system failure could have a most critical effect on the actions of the controllee. e. R[t) ·+ 1. Although such a target may not be fully attainable, one should aim at achieving it by pursuing all the five suggestions presented in Fig. 32. The first essential step is to employ only the components with the most high reliability factor available and then introduce them into the circuits by allowing them the widest possible operational tolerance.
That is, instead of employing identical parallel modules with each bearing the identical load, it is suggested that the load be shared among the parallel modules. In this technique, one used in multiprocessing (see the example given in Fig. 35), each module, whatever 40 COMMUNICATION FOR COMMAND AND CONTROL SYSTEMS its normal task, can perform all the operational functions of the system, this enabling the system load to be shared. When a fault occurs in any one of the modules, all the remaining modules take over the tasks of the faulty modules without appreciable reduction in the services provided by the system.