In the z14 server, the Top Exit I/O Cabling feature (FC 7942) is available for radiator-cooled  (air-cooled) models and water-cooled models. For more information, see  IBM 3906  Installation Manual for Physical Planning,  GC28-6965, and 10.3, “Physical planning” on  page 398. As shown in Figure 2-4, each PCIe I/O drawer (up to five) has 38 slots each to support the  PCIe I/O infrastructure with a bandwidth of 16 GBps and includes the following features: The PCIe I/O infrastructure uses the PCIe fanout that is installed in the processor (CPC)  drawers to connect to the PCIe I/O drawer, which can include the following features: 2.1.5 PCIe I/O drawer PCIe I/O infrastructure GLYPH<SM590000> A total of 32 I/O cards that are spread over 4 I/O domains. GLYPH<SM590000> Four PCIe switch cards that provide connectivity to the PCIe fanouts that are installed in  the processor drawer. Each domain has a dedicated support partition (four per system) to  manage the native PCIe card types that are installed in that domain. GLYPH<SM590000> Two Flexible Support Processor (FSP) cards that are used to control the drawer function. GLYPH<SM590000> Redundant N+1 blowers and power supplies.  GLYPH<SM590000> New features FICON Expresss16+ two port card, long wavelength (LX) or short  wavelength (SX), which contains two physical channel IDs (PCHIDs) GLYPH<SM590000> FICON Express features (only for a carry-forward MES): – FICON Express16S two port card, long wavelength (LX) or short wavelength (SX),  which contains two PCHIDs – FICON Express8S two port card, long wavelength (LX) or short wavelength (SX),  which contains two PCHIDs GLYPH<SM590000> Open Systems Adapter (OSA)-Express7S 25GbE Short Reach (SR) - New feature GLYPH<SM590000> Open System Adapter (OSA)-Express6S: – OSA-Express6S 10 Gb Ethernet one port card, Long Reach (LR) or Short Reach (SR),  which contains one physical channel ID PCHID – OSA-Express6S Gb Ethernet two port ca rd, LX or SX, which contains one PCHID – OSA-Express6S 1000BASE-T Ethernet, two port card, RJ-45, which contains one  PCHID Chapter 2. Central processor complex hardware components  39 Figure 2-4 PCIe I/O drawer front and rear view