IBM Serial I/O 128P Expandable Subsystem Hardware Installation Manual
1-8
In simple configurations, the host Adapter supplies power to all Port
Expansion Modules and Multiplexer Interface Expansion Modules
attached to the Expansion Bus via the supplied 4-foot (1.2m) Host Cable
(see Figure 1-7). Power is provided by the Adapter and is passed from
the left to right through each directly mated module.
Power Options
Host power is available to the Expansion Modules only when the
4-foot (1.2m) Host Cable is installed and Expansion Modules are
mated directly together.
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Expansion Modules may draw power from the host computer through
the 4-foot (1.2m) Host Cable.
Figure 1-7. Mated Expansion Modules Draw Power from Host
