Central processor complex (CPC)
Choosing the right terminology is, to some extent, a packaging phenomenon of a system design. For example, several central processor complexes (CPCs), all sharing modules, are supported by the z/TPF system. At some z/TPF system installations, this represents a central processing site. However, as different forms of local and wide area communication interconnections become universal, the use of the term central must be used with caution. Some z/TPF system installations, for instance, do not exist entirely in the same building. We still use the term central processor complex (CPC) to denote a z/Architecture® configuration attached through a channel subsystem to a set of devices or other z/Architecture configurations. Figure 1 shows interconnected loosely coupled complexes where each CPC is a z/Architecture configuration that can include multiple I-stream engines and a set of private devices such as tapes and modules. CPC is used to emphasize attachments that, architecturally, are external to a z/Architecture configuration.
