Service manual

System Overview 1-81
Figure 1–36 shows all the major I/O subsystem components. The QBB
backplane contains the IOP ASICs and two local I/O riser slots. The local I/O
riser provides two I/O ports that are cabled to the remote I/O riser modules
connected to the PCI backplane. The PCI backplane contains 14 PCI slots
spread over four logical 64-bit PCI buses. Two of those buses contain four PCI
slots and two contain three PCI slots.
An expansion PCI box contains the remote I/O risers, the CSB node ID module,
PCI power supplies, and fans.
In addition to the components found in an expansion PCI box, a master PCI box
contains a standard I/O module, a SCSI FIS disk, a standard I/O cable interface
module, and a CD-ROM or DVD player.
For information on the local I/O riser module, see Section 1.14.1.
For information on the remote I/O riser module, see Section 1.21.5.
For information on the standard I/O module, see Section 1.21.4.
For information on the CSB node ID module, see Section 1.21.6.
For information on the standard I/O cable interface module, see Section 1.21.7.