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IBM System z Connectivity Handbook by Zhaoxu Zhang, Hans Wijngaard, Esra Ufacik, André Spahni, Vicente Ranieri Jr, Frank Packheiser, Fernando Nogal, Swee Seng Ng, Gerard Laumay, Octavian Lascu, Parwez Hamid, Wolfgang Fries, Ivan Doboš, Karan Singh

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Channel subsystem overview
This chapter describes the zEC12 channel subsystem (CSS) which handles all the system input/output (I/O) operations for System z systems. The role of CSS is to control communication between internal or external channels and control units and devices.
The following topics are discussed:
CSS overview
Multiple CSS concept
I/O configuration management
I/O configuration planning
2.1 CSS description
CSS enables communication from system memory to peripherals via channel connections. The channels in the CSS permit transfer ...

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