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## 4 

## Central processor complex I/O structure 

This chapter describes the I/O system structure and connectivity options that are available on the IBM z15 servers. 

Note:  Throughout this chapter, z15  refers to IBM z15 Model T01 (Machine Type 8561). 

This chapter includes the following topics: 

GLYPH<SM590000> 4.1, “Introduction to I/O infrastructure” on page 156 

GLYPH<SM590000> 4.2, “I/O system overview” on page 158 

GLYPH<SM590000> 4.3, “PCIe+ I/O drawer” on page 160 

GLYPH<SM590000> 4.4, “CPC drawer fanouts” on page 163 

GLYPH<SM590000> 4.5, “I/O features” on page 166 

GLYPH<SM590000> 4.6, “Connectivity” on page 169 

GLYPH<SM590000> 4.7, “Cryptographic functions” on page 201 

GLYPH<SM590000> 4.8, “Integrated Firmware Processor” on page 203 

