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IBM zEnterprise EC12 Technical Guide by Parwez Hamid, Chen Zhu, Andre Spahni, Ewerson Palacio, Vicente Ranieri, Frank Packheiser, Fernando Nogal, Martijn Raave, Octavian Lascu, Luiz Fadel, Hua Bin Chu, Wolfgang Fries, Ivan Dobos

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Central processor complex channel subsystem
This chapter addresses the concepts of the IBM zEnterprise EC12 (zEC12) channel subsystem, including multiple channel subsystems. Also described are the technology, terminology, and implementation aspects of the channel subsystem.
This chapter includes the following sections:
5.1 Channel subsystem
The role of the channel subsystem (CSS) is to control ...

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