IBM 270, Service Manual

Page: 313 / 622

Notes:
1. The FC 5075 Expansion I/O Tower contains two system PCI busses.
2. In the FC 5075 Expansion I/O Tower FRU locations and failing components table, the first of the two
busses in the tower is designated as
″
xxxx
″
and the second bus in the tower is designated as
″
yyyy
″
.
3. In FC 5075 towers, the two bus numbers assigned to the busses are not required to be in any order.
4. There is an embedded CFIOP in the tower card in position CB1. This IOP is in the C01 - C04
multi-adapter bridge domain.
5. Card position C05 is required to be an I/O processor when any cards installed in the C05 - C08
multi-adapter bridge domain.
6. J11 is an RPO connection, J14 is a uninterruptable power supply connector, J15 is an SPCN 1
connector, and J16 is an SPCN 2 connector.
7. Multi-adapter bridge domains are labeled PCI Bridge Set inside the tower.
8. The following table provides information necessary to identify the IOP to which IOAs are assigned.
v
The left column indicates the domain in which IOA assignment is allowed.8:32 AM 10/21/2002
v
The right column is used to determine the IOP to which an IOA is assigned.
v
The first position in the list must be an IOP. The remaining positions may be IOPs or IOAs. IOAs are
assigned to the first IOP located to their left in the list. Although IOAs can be manually reassigned
using SST/DST, the IOA assignments return to the default order after each IPL.
Table 2. IOA assignment rules
Multi-adapter bridge domain / PCI bridge set IOA assignment rules
CB1, C01 - C04 CB1, C01, C02, C03, C04
C05 - C08 C05, C06, C07, C08
Locations — FC 5078, 0578 Expansion I/O Unit
For use by authorized service providers.
The following diagram shows FRU layout in the FC 5078, 0578 Expansion I/O Unit. Use it with the tables
below. If you need address information, refer to Addresses — FC 5078, 0578 Expansion I/O Unit.
Figure 1. Locations for FC 5078, 0578 Expansion I/O Unit
Figure 2. Locations for FC 5078, 0578 Expansion I/O Unit
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