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IBM z14 Technical Guide by Michal Kordyzon, William G White, Frank Packheiser, John Troy, Bo Xu, Esra Ufacik, Hervey Kamga, Octavian Lascu

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Central processor complex channel subsystem
This chapter describes the concepts of the z14 channel subsystem, including multiple channel subsystems and multiple subchannel sets. It also describes the technology, terminology, and implementation aspects of the channel subsystem.
This chapter includes the following topics:
5.1 Channel subsystem
Channel subsystem (CSS) is a collective name of facilities that Z servers ...

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