The domains and their related I/O slots are shown in Figure 4-4. Each I/O domain supports up to eight features (FICON, OSA, Crypto, and so on.) All I/O  cards connect to the PCIe switch card through the backplane board. The I/O domains and  slots are listed in Table 4-1. A maximum of five PCIe I/O drawers can be installed that support up to 160 PCIe I/O  features.  For an upgrade to IBM z14™ servers, only the following PCIe I/O features carried forward: 4.4 PCIe I/O drawer offerings Chapter 4. Central processor complex I/O system structure  153 GLYPH<SM590000> FICON Express16S GLYPH<SM590000> FICON Express8S GLYPH<SM590000> OSA-Express5S (all 5S features)  GLYPH<SM590000> OSA-Express4S 1000BaseT (only) Figure 4-4 PCIe I/O drawer with 32 PCIe slots and 4 I/O domains Table 4-1 I/O domains of PCIe I/O drawer 0 0 0 0 PCIe Switch 0 0 0 0 FSP-1, 1 2 2 2 2 PCIe Switch 2 2 2 2 3 3 3 3 PCIe Switch 3 3 3 3 FSP-1, 2 1 1 1 1 PCIe Switch 1 1 1 1 01 02 03 04 06 07 08 09 11 12 13 14 16 17 18 19 05 10 15 38 37 36 35 33 32 31 30 28 27 26 25 23 22 21 20 34 29 24 Front - 16 Rear - 16 RI I Domain I/O slot in domain 0 01, 02, 03, 04, 06, 07, 08, and 09 1 30, 31, 32, 33, 35, 36, 37, and 38 2 11, 12, 13, 14, 16, 17, 18, and 19 3 20, 21, 22, 23, 25, 26, 27, and 28