IBM 7026-H80 - RS/6000 - 256 MB RAM Service Manual page 70

SPCN Cabling
The following figures provide cabling examples for all valid cabling configurations.
Match your configuration to the correct figure and connect your SPCN cables as shown.
CEC Drawer Attached to One I/O Drawer
Note: The V/S COMM cable includes SPCN signals in addition to other signals.
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Service Guide
CEC
Drawer
V/S COMM
Primary I/O
Drawer
V/S COMM J TAG
J TAG