8464ch04_Planning.fm Draft Document for Review February 7, 2020 3:15 pm Note:  Considerations for host FICON connections: GLYPH<SM590000> IBM Z systems that use 8 Gbps FICON ports do support only TS7700 connections that  are running 4 Gbps and 8 Gbps speeds for direct attachments. However, 2 Gbps  connections to TS7700 are also supported if FICON Director provides proper speed  conversion. GLYPH<SM590000> IBM Z 16 Gbps FICON supports only TS7700 16 Gbps and 8 Gbps FICON  direct-attached. GLYPH<SM590000> IBM Z 16 Gbps FICON supports TS7700 4 Gbps FICON if FICON Director provides  proper speed conversion. Host attachment supported distances When directly attaching to the host, the TS7700 can be installed at a distance of up to 10 km  (6.2 miles) from the host. With FICON switches, also called  FICON Directors  or  Dense Wave  Division Multiplexers (DWDMs) , the TS7700 can be installed at extended distances from the  host. Figure 4-4 shows a sample diagram that includes the DWDM and FICON Directors  specifications. For more information, see “FICON Director support” on page 153. 152  IBM TS7700 Release 5.0 Guide Figure 4-4 The IBM Z host attachment to the TS7700 (at speed of 8 Gbps)