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ONLINE AND OFFLINE MODES OF OPERATION
OPERATIONAL REQUIREMENTS OF COMPUTER  SYSTEMS

Fire Controlman Volume 03-Digital Data Systems
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BATTLE SHORT MODE OF OPERATION The battle short mode is used when it becomes necessary  to  run  the  computer  continuously  even though  an  overtemperature  condition  exists.  The activation   of   a   battle   short   switch   will   bypass overtemperature  protection  interlocks  and  power  will be maintained to the computer for continued operation. An  overtemperature  condition  is  a  result  of  a  failed assembly or inadequate cooling. The requirement to run  the  computer  continuously  in  an  overtemperature condition  usually  only  exists  under  battle  conditions. Some computers are also equipped with a horn to warn an overtemperature condition exists. OPERATIONAL CAPABILITIES AND LIMITATIONS It  is  important  to  know  the  capabilities  and limitations of the hardware and software of any system you maintain. It is equally important to know whether the system can operate at reduced capability and still accomplish  its  mission. Some systems are designed with  more  than  one  computer  (CPU),  sufficient memory,  and  enough  peripheral  devices  to  enable  them to  function  even  when  some  devices  are  down.  The operational capabilities and limitations of a computer system can be controlled at the equipment through switchboards or control panels, or through commands to the software using an I/O device to talk to the computer. Figure 1-11 is an illustration of a digital fire control   switchboard   used   on   a   CDS/NTDS   to interconnect  the  computer  to  equipments  and  other major systems. To  find  out  the  capabilities  and  limitations  of  a computer  system,  refer  to  your  system  operating manuals   (SOMs)   or   combat   systems   technical operations manuals (CSTOMs) for details. CDS/NTDS is an example of a system that uses a three-bay/one-bay   computer   configuration.   This means it has four CPUs and can still meet its mission even if one of the CPUs is down. The term  reduced capabilities  means the computer system can perform its mission  with  fewer  resources.  Resources  may  be unavailable as a result of a casualty to a computer. If the memory of the computers allows it, you can take one of the computers offline to perform training. You can reduce the operational capability through the software using an I/O device to take the computer offline. This can be accomplished using operating system functions (commands). An example would be Figure  1-11.—A  digital  fire  control  switchboard  used  on  a  CDS/NTDS. 1-13






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