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IBM z Systems Connectivity Handbook by Bill White, Frank Packheiser, Ewerson Palacio

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Channel subsystem overview
This chapter describes the channel subsystem (CSS), which handles all the system input/output (I/O) operations for IBM z Systems platforms. The role of the CSS is to control communication between internal or external channels and control units and devices.
This chapter covers the following topics:
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 ...

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