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## 2.1 Frames and drawers 

IBM Z frames are enclosures that are built to Electronic Industries Alliance (EIA) standards. The z14 server (Machine Type 3906) has two 42U EIA frames (A and Z), which are bolted together. They have positions for up to four processor drawers and up to five Peripheral Component Interconnect Express (PCIe) I/O drawers. The other components included in the frames are described in the following sections. 

The z14 server and its predecessor, the z13, have the option of ordering the infrastructure to support the top exit of fiber optic cables (FICON, OSA, 12x InfiniBand, 1x InfiniBand, ICA, zHyperLink Express, Coupling Express LR, and RoCE) and copper cables for the 1000BASE-T Ethernet features. On the z14 server, the top exit capability is designed to provide an option for overhead power cabling. 

The z14 server can be delivered as an air-cooled or water-cooled system. An air-cooled system with the optional top exit I/O and power feature with the maximum of four CPC drawers and five PCIe I/O drawers is shown in Figure 2-1. 

<img src='content_image/1001127.jpg'>

