10 IBM eServer zSeries 900 Technical Guide
FICON support of cascaded switches have the added value of ensuring high integrity
connectivity. Transmission data checking, link incidence reporting, and error checking are
integral to the FICON architecture, providing a true enterprise fabric.
Open Systems Adapter 2 (OSA-2)
The S/390 Open Systems Adapter 2 (OSA-2) Fiber Distributed Data Interface (FDDI) and
Token Ring (TR) features are supported on z900. The OSA-2 FDDI feature is available for
new builds and for upgrades, and the OSA-2 TR feature is only available for upgrades. The
OSA-2 features can only be used in an FC 2022 I/O cage.
The OSA-2 features continue to require the S/390 Open Systems Adapter Support Facility
(OSA/SF) when configuring ...