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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. 

<img src='content_image/1014299.jpg'>

