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. Figure 2-1 z14 internal front view of an air-cooled CPC (Machine type 3906, models M04 or M05) 36  IBM z14 (3906) Technical Guide