test

Sun HPC 3.0 SCI Guide

SCI Adapter Card Scrubber Jumpers

Each SCI adapter card has a jumper, called the scrubber jumper. This jumper configures the scrubber circuit, which controls link maintenance functions. Figure 1-5 shows its location on the SCI adapter card.

Figure 1-5 Location of the Scrubber Jumper

Graphic

Table 1-1 specifies the appropriate scrubber jumper settings for unswitched and switched SCI networks.

Table 1-1 Scrubber Jumper Settings

Topology 

SCI SBus Card Jumper Settings 

Two nodes (unswitched) 

Set one jumper ON and the other jumper OFF in each connected pair of SCI adapter cards. See Figure 1-6 for examples of two-node jumper settings.

Three or four nodes (switched) 

Set all jumpers ON.  

Figure 1-6 Examples of Scrubber Jumper Settings in Two-Node Networks

Graphic

Note -

SCI adapter cards are shipped without a default setting. Therefore, examine the setting on each SCI adapter card and adjust it if necessary. If scrubber jumpers are not set correctly when installed, communication between nodes may experience intermittent faults.