Examp1e of a modular-designed frame computer.

Figure 2-10.—Examp1e of a modular-designed frame computer. The chassis- or assembly-designed computer contains the following: Chassis or assemblies Chassis or assembly mounting and retaining hardware Chassis or assembly electrical connector receptacles and interconnecting wiring harness External connections for data and power cables Printed circuit boards (pcb’s) An operator’s control or maintenance panel A blower unit with air filter and heat exchanger, which allows cooling air to circulate through all the chassis or assemblies inside the frame or cabinet Gaskets for electronic shielding, moisture protection, air ducting, and electrical connectors Filter unit for electronic shielding Test blocks for maintenance Time meter to monitor powered-on time Chassis or assemblies use the same basic concept as modules except they are not readily removable and usually contain more than one functional area of the computer. The functional areas are usually grouped together in blocks of two or more pcb’s. The subassemblies or pcb’s that make up a functional area are grouped together in a chassis or assembly rather than 2-9