SGI 2400 Manuel de service télécharger pdf (Page 50)

Chapter 2: Chassis Tour

Router Boards

The Router board (see Figure 2-9) is a multiported, bidirectional data packet controller

that can transport up to 1600 MB/sec per port (in each direction). Each system module

can have one, two, or no Router boards (depending on the number of Node boards that

are present). The router interfaces with the hubs on Node boards and allows the 64-bit

processors on one Node board to directly access the main memory located on other Node

boards. There are four types of Router boards:

• Null Router

• Star Router

• Rack Router

• Cray Router

If a module has only one Node board, no Router is required. A Router board is required

only when there are two or more Node boards.

Note: The Null and Star Router boards are primarily used in SGI 2100 or 2200 deskside

systems. The deskside is equivalent to an individual module in a rackmount system.

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SGI 2400 Manuel de service Page 50