A-2
IBM Serial I/O 128P Expandable Subsystem Hardware Installation Manual
Optional Power
Configuration
Default Power
Configuration
All Serial I/O Adapters are initially setup to draw power for the host
cables from both the host computer PCI bus and host computer power
supply. The power straps (default) shown in Figure A-1 are
configured to select these power sources.
The top Host Cable Bus (Modules 5-8) receives power from the host
computer power supply via the host “Y” cable (J1-see Figure A-1).
The bottom Host Cable Bus (Modules 1-4) receives power from the
host computer motherboard PCI bus.
Power for the top Host Cable (Port Modules 5-8) can be drawn from
the host computer PCI bus (instead of J1). To draw all port module
power from the host computer motherboard, remove and set aside the
host power "Y" cable connected to J1 and configure the power straps as
shown in Figure A-2
.
Figure A-1. Serial I/O Adapter Power Strap Default Connections
Figure A-2. Optional Adapter Power Strap Connections To Obtain Power
For Port Modules 1-8 From The Host Computer PCI bus
