On IBM z14™ servers, both ports are supported by z/OS and can be shared by up to 126  partitions (LPARs) per PCHID. The 25GbE RoCE Express2 feature uses SR optics and  supports the use of a multimode fiber optic cable that ends with an LC Duplex connector. Both  point-to-point connections and switched connections with an enterprise-class 25GbE switch  are supported. Switch configuration for RoCE Express2:  If the IBM 25GbE RoCE Express2 features  are connected to 25GbE switches, the switches must meet the following requirements: The 25GbE RoCE Express feature does not support auto-negotiation to any other speed  and runs in full duplex mode only.  10GbE and 25GbE RoCE features should  not  be mixed in a z/OS SMC-R Link Group. The maximum supported unrepeated distance, point-to-point, is 100 meters (328 feet). A  client-supplied cable is required. Two types of cables can be used for connecting the port to  the selected 25GbE switch or to the 25GbE RoCE Express2 feature on the attached server: For more information about the management and definition of the 25GbE RoCE Express2  feature, see Appendix D, “Shared Memory Communications” on page 425, and Appendix C,  “Native Peripheral Component Interconnect Express” on page 419. RoCE Express2 (FC 0412) is installed in the PCIe+ I/O drawer and is supported on z14 ZR1.  The 10GbE RoCE Express2 is a native PCIe feature. It does not use a CHPID and is defined  by using the IOCP  FUNCTION  statement or in the hardware configuration definition (HCD).  On z14 ZR1 servers, both ports are supported by z/OS and can be shared by up to 126  partitions (LPARs) per PCHID. The 10GbE RoCE Express2 feature uses SR optics and  supports the use of a multimode fiber optic cable that ends with an LC Duplex connector. Both  point-to-point connections and switched connections with an enterprise-class 10 GbE switch  are supported. GLYPH<SM590000> Global Pause function enabled GLYPH<SM590000> Priority flow control (PFC) disabled GLYPH<SM590000> No firewalls, no routing, and no IEDN GLYPH<SM590000> OM3 50-micron multimode fiber optic cable that is rated at 2000 MHz-km that ends with an  LC Duplex connector, which supports 70 meters (229 feet) GLYPH<SM590000> OM4 50-micron multimode fiber optic cable that is rated at 4700 MHz-km that ends with an  LC Duplex connector, which supports 100 meters (328 feet) GLYPH<SM590000> Global Pause function enabled GLYPH<SM590000> Priority flow control (PFC) disabled GLYPH<SM590000> No firewalls, no routing, and no IEDN 10GbE RoCE Express2 The virtualization capabilities for z14 ZR1 are 31 Virtual Functions per port (62 VFs per  feature). The RAS was improved and ECC double bit correction added. Switch configuration for RoCE Express2:  If the IBM 10GbE RoCE Express2 features  are connected to 10 GbE switches, the switches must meet the following requirements: Chapter 4. Central processor complex I/O system structure  149