Coupling links support Integrated Coupling Adapter Coupling Express Long Reach Integrated Coupling Adapter (ICA) Short Reach and Coupling Express Long Reach (CE LR)  coupling link options provide high-speed connectivity at short and longer distances over fiber  optic interconnections. Several areas of this book address CE LR and ICA SR characteristics  and support. For more information, see 4.6.4, “Parallel Sysplex connectivity” on page 153. PCIe Gen3 fanout, which is also known as Integrated Coupling Adapter Short Range (ICA  SR), supports a maximum distance of 150 meters (492 feet) and is defined as CHPID type  CS5 in IOCP. The Coupling Express Long Reach (CE LR) link provides point-to-point coupling connectivity  at distances of 10 kilometers (6.21 miles) unrepeated and defined as CHPID type CL5 in  IOCP. The supported operating systems are listed in Table 7-5 on page 217. Note:  IBM z14 ZR1 server does  not  support HCA3-O fanout for 12x IFB (FC 0171) and  HCA3-O LR fanout for 1x IFB (FC 0170).$^{a}$ As announced previously, z14 Model M0x is the  last IBM Z server to support these adapters.  Enterprises should migrate from HCA3-O and HCA3-O LR adapters to ICA SR or Coupling  Express Long Reach (CE LR) adapters on z14 ZR1, z14 M0x, z13, and z13s. For  high-speed short-range coupling connectivity, enterprises should migrate to the Integrated  Coupling Adapter (ICA SR).  For long-range coupling connectivity, enterprises should migrate to the new Coupling  Express LR coupling adapter. For long-range coupling connectivity that requires a DWDM,  enterprises must determine their needed DWDM vendor’s plan to qualify the planned  replacement long-range coupling links. IBM Z enterprises should plan to migrate from InfiniBand coupling links. For high-speed  short-range coupling connectivity, enterprises should migrate to the Integrated Coupling  Adapter (ICA SR). For long-range coupling connectivity, enterprises should migrate to the new CE LR  coupling link. For long-range coupling connectivity that requires a DWDM, enterprises  must determine their wanted DWDM vendor’s plan to qualify the CE LR. For more  information, see Hardware Announcement 117-031, dated March 2017. VFM can be used in coupling facility images to provide extended capacity and availability for  workloads that use WebSphere MQ Shared Queues structures. The use of VFM can help  availability by reducing latency from paging delays that can occur at the start of the workday  or during other transitional periods. It is also designed to help eliminate delays that can occur  when diagnostic data during failures are collected. The Coupling Thin Interrupts enhancement is delivered with CFCC 19. It improves the  performance of a CF partition and improves the dispatching of z/OS LPARs that are awaiting  the arrival of returned asynchronous CF requests when used in a shared engine environment.  For more information, see “ Coupling Thin Interrupts ” on page 86. The supported operating  systems are listed in Table 7-5 on page 217. a. Per previous Statement of Direction. Virtual Flash Memory use by CFCC CFCC Coupling Thin Interrupts 242  IBM 14 Model ZR1 Technical Guide