IBM RS/6000 SP, Handbook

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RS/6000 SP and Clustered IBM
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pSeries Systems Handbook
5.8.2 SP Switch2 adapter (F/C 4025)
Like the SP Switch Adapter, the SP Switch2 Adapter is controlled by node
software and on-card microprocessor microcode. The adapter has two ports.
Only one port (the upper port) is fully functional, the second is reserved. The
configuration is called a
Single-Single
configuration.
The adapter has several design improvements including an on-board RAM
memory component and a hardware driven datagram segmentation and
reassemble engine to proceed 64KB IP datagram. To improve data flow through
the adapter, the design include separate paths for microprocessor operations
and data transfers and implement four 1000 MB/s uni-direction buses. Figure 5-9
on page 179 shows the SP Switch2 adapter hardware structure.
Note:
򐂰
The SP Switch2 and its adapters are not compatible with the SP Switch or
High Performance Switch series or their adapters; they cannot coexist in
the same SP system.
򐂰 Only POWER3 and 375 MHz POWER3 High Nodes can be connected to
the SP Switch2; no other node types can be included in the switch fabric.
򐂰 The SP Switch2 cannot be connected to an SP-attached server, Clustered
Enterprise Server or to an SP Switch Router.