By D. J. Morris (Auth.)
Offers an in depth fully-illustrated therapy of the layout of communique networks for command and keep an eye on structures. when masking the fundamental conception, emphasis all through is positioned upon the sensible points of computing device managed verbal exchange. The communique community is taken care of as a method, instead of as a suite of things of kit, and techniques are precise to guage the worthiness of every block and the issues bobbing up in interfacing them into the process. additionally contains comparability tables for the choice of blocks for particular reasons. technique of shifting information among a number of the processing issues, their capability benefits and attainable defects are appraised and techniques of fixing such difficulties tested. Covers new advances within the fields of packet-switching communique community, multiple-access communique strategies, unfold spectrum conversation, electronic voice exchanges, optical verbal exchange, and satellite tv for pc communique
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Extra resources for Communication for Command and Control Systems
A typical example of such a long distance communication requirement could be the occurrence of a tropical illness in a cold northern country. In this case, the channels in the distributed network communication may be not only of copper wires or radio links, but also of satellite links as discussed in Chapter 5. Such a fully distributed network, as shown in Fig. 41, provides fast communication using packet switching techniques. Each centre, in such a configuration, is of equal importance and can contact any other centre either directly or via other centres.
HARDWARE REDUNDANCY * Τ t FAIL-TOLERANT Ι • FAIL- SOFT 1 BASED ON BASED ON PARALLEL LOAD SHARED LOAD ι \ ! PROVIDES FULL RECOVERY PROVIDES GRACEFUL DEGREDATION OF SYSTEM SERVICE OF SYSTEMt\ SERVICE I 1 T H R E S*H O L D REDUNDANCY • STANDBY REDUNDANCY PSEUDO REDUNDANCY F i g . 36 Classification performance with hardware of system redundancy System reliability has already been defined as the probability that the system will operate correctly without entering a failed state for a given period of time.
If the system's performance could always be anticipated, with no ambiguous situations occurring, then there would be no need for a complex human system operation and all the control system could be transferred to a processing unit. Command and control systems, however, have emerged for the sole purpose of solving the control operations of unpredictive performances of a process or action. The command and control system design must be directed at the possible random operational conditions of the system rather than at the normal smooth running of it.