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Again, there is no need to provide each bedside monitor with direct lines to the computer. Here multidrop lines (see Chapter 4) together with programmable concentrators (see Chapter 7) are suggested for each ward, with the data flow controlled by polling procedures. The delays that may be caused by these procedures are negligible compared with the reaction time of the human physician. It should be added here that the common lines to the patient's bedside of each system are separate from each other.

If each module has the reliability factor of r(t) the overall reliability factor of the system will be 38 COMMUNICATION FOR COMMAND AND CONTROL SYSTEMS n R{t)q =r(t) where η is the number of modules connected in series. Only by introducing redundancy into the system can its reliability factor be increased. , m>\, will double or triple the system cost. Nevertheless, redundancy is unavoidable if systen reliability is to be achieved. There are a number of redundancy techniques available to the designer, depending on the price he is ready to pay to achieve high reliability operation.

27 C system d e s i g n p r o c e d u r e for calculating the maximum traffic throughput of the maximum data throughput through the node during the systems' worst operational period as envisaged by the scenario situation. One should also add to this maximum unpredicted data volume, the routine data volume that continuously flows from the field. In conclusion it should be added that the scenario technique, as des2 system design as a whole, but only cribed here, is not suggested for the C 2 for the design of the communication network within a C system.

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