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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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Introducing connectivity
This chapter introduces the connectivity options available on the IBM zEnterprise EC12 and System z families of servers. The following topics are briefly discussed:
Connectivity support
Channel subsystem (CSS)
I/O cages, I/O drawers, and PCIe I/O drawers
Supported channel types
The input/output architecture, implementation, and system-relevant rules for zEC12 and System z servers are described in detail in subsequent chapters.
1.1 Overview
Input/output (I/O) channels1 are components of the zEC12 and System z CSS and ...

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