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Example  of  a  chassis-  or  assembly-designed  computer
Gaskets

Fire Controlman Volume 03-Digital Data Systems
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Subassembly  or  pcb  mounting  slides  and retaining  hardware Subassembly   or   pcb   electrical   connector receptacles and interconnecting wiring harness Printed circuit boards External connections for data and power cables An operator’s control or maintenance panel Power supply unit Blower unit Air  falter In a cage or rack arrangement, only the functional areas of the computer are contained in the cage or rack. The cage or rack contains pcb’s that only house the major functional areas, such as CPU, memory, and I/O. Sometimes more than one functional area will be contained on a pcb. The pcb’s slide into slots inside the cage or rack. The connector receptacles for each subassembly or pcb are usually located at the rear of the cage or rack. The pcb’s are not always keyed, so you must exercise care when installing them. The pcb’s are secured in each slot by retaining hardware. The cage or rack is generally fixed and cannot be extended as a whole  unit.  The  pcb’s  can  usually  be  accessed  with power on, but power must be secured when you remove and  replace  a  pcb. The  pcb’s  can  be  extended individually for rnaintenance. The other main parts of the computer, such as the power supply unit and cooling unit, are located in a different part of the frame or cabinet, not in the cage or rack with the pcb’s. Figure 2-12 is an illustration of a cage or rack setup. Motherboard-  or  Backplane-Designed Computer    Framed/Cabinets Computers that use a motherboard or backplane design   are   built   more   for   their   portability   and compactness. They are the least rugged. The frame or cabinet contains the following: A motherboard or backplane with the connector receptacles for each pcb, the keyboard, and in some types of micros: single inline memory modules  (SIMMs),  single  inline  packages (SIPS), and single inline pin packages (SIPPs) Wiring   harness   for   the   motherboard   or backplane Pcb’s with the necessary I/O connectors External connections for the power cables Retaining  hardware  for  the  motherboard  or backplane A power supply unit A small fan with an air filter for cooling A small speaker Figure 2-12.—Example of a cage- or rack-designed computer frame or cabinet 2-11






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