FICON Express8S SX 8 Gbps MM 62.5 µm MM 50 µm 21 m (200) 50 m (500) 150 m (2000) 190 m (4700) 4 Gbps MM 62.5 µm MM 50 µm 70 m (200) 150 m (500) 380 m (2000) 400 m (4700) 2 Gbps MM 62.5 µm MM 50 µm 150 m (200) 300 m (500) 500 m (2000) N/A (4700) Channel feature Feature codes Bit rate Cable type Maximum unrepeated  distance$^{a}$ (MHz -km) a. Minimum fiber bandwidths in MHz/km for multimode fiber optic links are included in parentheses, where  applicable. b. 2 and 4 Gbps connectivity is not supported for point-to-point connections c. 2 and 4 Gbps connectivity is supported through a switch with 8 or 16 Gb optics. GLYPH<SM590000> z/OS V2.4 GLYPH<SM590000> z/OS V2.3 with PTFs GLYPH<SM590000> z/OS V2.2 with PTFs GLYPH<SM590000> z/OS V2.1 with PTFs GLYPH<SM590000> z/OS V2.4 GLYPH<SM590000> z/OS V2.3 with PTFs GLYPH<SM590000> z/OS V2.2 with PTFs GLYPH<SM590000> z/OS 2.1 or later GLYPH<SM590000> 150 m maximum distance in a point-to-point configuration 7 CKD data records are handled by using IBM Enhanced Count Key Data (ECKD) command set. 180  IBM z15 (8561) Technical Guide zHyperLink Express1.1 (FC 0451) Requirements of zHyperLink Express1.1 zHyperLink is a new technology that provides up to 5x reduction in I/O latency times for Db2  read requests with the qualities of service IBM Z clients expect from I/O infrastructure for Db2  v12 with z/OS. The z/OS supported versions for Reads are: The z/OS supported versions for Writes support are: The zHyperLink Express1.1 feature (FC 0451) provides a low latency direct connection  between z15 and DS8k storage system.  The zHyperLink Express1.1 is the result of new business requirements that demand fast and  consistent application response times. It dramatically reduces latency by interconnecting the  z15 directly to I/O Bay of the DS8k by using PCIe Gen3 x 8 physical link (up to 150-meter  [492-foot] distance). A new transport protocol is defined for reading and writing IBM CKD data  records$^{7}$, as documented in the zHyperLink interface specification. On z15, zHyperLink Express1.1 card is a new PCIe Gen3 adapter, which installed in the  PCIe+ I/O drawer. HCD definition support was added for new PCIe function type with PORT  attributes. The zHyperLink Express feature is available on z15 servers, and includes the following  requirements: