4.7.2 Storage connectivity FICON channels a. UTP is unshielded twisted pair. Consider the use of category 6 UTP for 1000 Mbps  connections. b. Or 50 µm MM OM3 (2 GHz-km), but OM4 is highly recommended. MM = Multi-Mode SM = Single-Mode Connectivity to external I/O subsystems (for example, disks) is provided by FICON channels  and zHyperLink$^{4}$.  z14 supports the following FICON features: The FICON Express16S+, FICON Express16S, and FICON Express8S features conform to  the following architectures: The FINCON features provide connectivity between any combination of servers, directors,  switches, and devices (control units, disks, tapes, and printers) in a SAN. Each FICON Express16S+, FICON Express16S, and FICON Express 8S feature occupies  one I/O slot in the PCIe I/O drawer. Each feature has two ports, each supporting an LC  Duplex connector, with one PCHID and one CHPID associated with each port. All FICON Express16S+, FICON Express16S, and FICON Express8S features use SFP  optics that allow for concurrent repairing or replacement for each SFP. The data flow on the  unaffected channels on the same feature can continue. A problem with one FICON port no  longer requires replacement of a complete feature. All FICON Express16S+, FICON Express16S, and FICON Express8S features also support  cascading, which is the connection of two FICON Directors in succession. This configuration  minimizes the number of cross-site connections and helps reduce implementation costs for  disaster recovery applications, IBM Geographically Dispersed Parallel Sysplex™ (GDPS),  and remote copy. Each FICON Express16S+, FICON Express16S, and FICON Express8S channel can be  defined independently for connectivity to servers, switches, directors, disks, tapes, and  printers, by using the following CHPID types: 4 zHyperLink feature operates together with a FICON channel GLYPH<SM590000> CHPID type FC: The FICON, zHPF, and FCTC protocols are supported simultaneously. IBM z14™ servers support 32K devices per FICON channel for all FICON features. Chapter 4. Central processor complex I/O system structure  167 GLYPH<SM590000> FICON Express16S+  GLYPH<SM590000> FICON Express16S GLYPH<SM590000> FICON Express8S (carry-forward only) GLYPH<SM590000> Fibre Connection (FICON)  GLYPH<SM590000> High Performance FICON on Z (zHPF) GLYPH<SM590000> Fibre Channel Protocol (FCP) 0170 HCA3-O LR (1xIFB) LC Duplex 9 µm SM 0431 zHyperLink Express MPO 50 µm MM OM4  (4.7 GHz-km) Feature code Feature name Connector type Cable type