Coupling links support Integrated Coupling Adapter Short Reach Coupling Express Long Reach IFB coupling links GLYPH<SM590000> 12x InfiniBand coupling links (HCA3-O) are used for local connections up to 150 meters  (492 feet). The 12x IFB link (HCA3-O) connects between z14, z13, z13s, zEC12, and  zBC12 servers. It cannot be connected to an ICA SR. GLYPH<SM590000> 1x InfiniBand coupling links (HCA3-O LR) are used for extended distance connections  between z14, z13, z13s, zEC12, and zBC12 servers. The HCA3-O LR 1X InfiniBand links  have a bandwidth of 5 Gbps, use single mode fiber, and cannot be connected to a CE LR.  The following Parallel Sysplex coupling links use IFB:  GLYPH<SM590000> Internal Coupling (IC) links that are operating at memory speed. GLYPH<SM590000> Integrated Coupling Adapter Short Reach GLYPH<SM590000> Coupling Express Long Reach GLYPH<SM590000> IFB coupling links: – HCA3-O, 12x Parallel SysplexInfiniBand (IFB) coupling links. – HCA3-O, 1x Parallel Sysplex In finiBand (IFB) coupling links. Coupling connectivity in support of Parallel Sysplex environments is provided on the z14  server by the following features: Note $^{a}$: z14 is the last high-end IBM Z server to support Parallel Sysplex InfiniBand (PSIFB)  coupling links; z13s is the last midrange IBM Z server to support them. IBM Z enterprises  should plan to migrate off from PSIFB links. a. All statements regarding IBM plans, directions, and intent are subject to change or withdrawal  without notice. Any reliance on these statements of general direction is at the relying party’s  sole risk and will not create liability or obligation for IBM. All coupling link types can be used to carry STP messages. The Integrated Coupling Adapter Short Reach (ICA SR) feature (introduced with IBM z13) is  a two-port fanout that is used for short distance coupling connectivity. It uses PCIe Gen3  technology, with x16 lanes that are bifurcated into x8 lanes for coupling.  The ICA SR is designed to drive distances up to 150 m and support a link data rate of  8 GBps. The ICA SR fanout takes one PCIe I/O fanout slot in the z14 CPC drawer. It is used  for coupling connectivity between z14, z13, and z13s CPCs, and cannot be connected to  HCA3-O or HCA3-O LR coupling fanouts. The ICA SR is compatible with another ICA SR  only. z14 introduces the new Coupling Express Long Range (CE LR), which is a two-port feature  that is used for long-distance coupling connectivity and defined as coupling channel type,  CL5. Unlike the 1x IFB InfiniBand coupling links, which were plugged into the CPC drawer,  the CE LR link is plugged in a PCIe I/O drawer slot, which uses industry standard I/O  technology.  Compared to the HCAO-3 LR feature, which has 4-port and 4-link increments, the CE LR link  allows for more granularity when scaling up or completing maintenance. Link performance is  similar to the InfiniBand 1x coupling link and uses identical Single Mode fiber. The CE LR link  provides point-to-point coupling connectivity at distances of 10 km unrepeated and 100 km  with a qualified dense wavelength division multiplexing (DWDM) device. Chapter 1. Introducing the IBM z14  23