GLYPH<SM590000> They can be used in test or production configurations, reduce the cost of moving into  Parallel Sysplex technology, and enhance performance and reliability. GLYPH<SM590000> They can be defined as spanned channels across multiple channel subsystems. GLYPH<SM590000> They are available at no extra hardware cost (no feature code). Employing ICFs with IC  links results in considerable cost savings when configuring a cluster. Extended distance support Coupling Express Long Reach Integrated Coupling Adapter Short Range IC links are enabled by defining CHPID type ICP. A maximum of 64 IC links can be defined on  an IBM 15 CPC. The ICA SR (FC 0172) was introduced with the IBM z13. z15 introduces ICA SR1.1 (FC  0176). ICA SR and ICA SR1.1 are two-port, short-distance coupling features that allow the  supported IBM Z systems to connect to each other. ICA SR and ICA SR1.1 use coupling  channel type CS5. The ICA SR uses PCIe Gen3 technology, with x16 lanes that are  bifurcated into x8 lanes for coupling. ICA SR1.1 uses PCIe Gen4 technology, with x16 lanes  that are bifurcated into x8 lanes for coupling. The ICA SR & SR1.1 are designed to drive distances up to 150 m and supports a link data  rate of 8 GBps. It is designed to support up to four CHPIDs per port and seven subchannels  (devices) per CHPID.  For more information, see  IBM Z Planning for Fiber Optic Links (FICON/FCP, Coupling Links,  and Open System Adapters) , GA23-1407 as this web page. The Coupling Express LR occupies one slot in a PCIe I/O drawer or PCIe+ I/O drawer$^{10}$. It  allows the supported IBM Z systems to connect to each other over extended distance. The  Coupling Express LR (FC 0433) is a two-port that uses coupling channel type CL5.  The Coupling Express LR uses 10GbE RoCE technology and is designed to drive distances  up to 10 km (6.21 miles) unrepeated and support a link data rate of 10 Gigabits per second  (Gbps). For distance requirements greater than 10 km (6.21 miles), clients must use a  Wavelength Division Multiplexer (WDM). The WDM vendor must be qualified by IBM Z. Coupling Express LR is designed to support up to four CHPIDs per port, 32 buffers (that is, 32  subchannels) per CHPID. The Coupling Express LR feature is in the PCIe+ I/O drawer on IBM  z15. For more information, see  IBM Z Planning for Fiber Optic Links (FICON/FCP, Coupling Links,  Open Systems Adapters, and zHyperLink Express) , GA23-1408, which is available at this  web page. For more information about extended distance support, see  System z End-to-End Extended  Distance Guide , SG24-8047. 10 PCIe+ I/O drawer (FC 4021) is introduced with z15 as-is and built in a 19-inch format. FC 4021 contains 16 I/O  slots. FC 4021 can host up to 16 PCIe I/O features (adapters). The PCIe I/O drawer (4032 on z14) cannot be  carried forward during and MES upgrade to z15. z15 support only PCIe+ I/O drawers. Chapter 4. Central processor complex I/O structure  199