PCI Card Placement Rules 301
PCI Card Placement Rules
Now the following features need to be added to the system:
• Two #2843 PCI IOPs
• #5074 PCI Expansion Tower with base #9943 IOP
• Six #4746 PCI Twinax Workstation IOAs (provides attachment for 240 Twinax device
addresses, including Twinax Console)
• One #4748 PCI RAID Disk Unit Controllers (provides attachment of Disk Units and
RAID-5 capability)
• One #4838 PCI 100/10 Mbps Ethernet IOAs (provides attachment to 100 Mbps
Ethernet segments)
• One #2749 Ultra Magnetic Media IOAs (provides attachment of the remaining
7208-342 tape unit)
Examination of the card enclosure shows that slots C07 through C12 are empty. At this point,
the choice of cards and their placement is very flexible. The author has chosen to place three
of the #4746s and a #2749 in the remaining slots in the Model 820 card enclosure. The
validation of the IOP capabilities is listed here:
1. Identify the IOP being considered.
A #2843 IOP will be used.
C12
C11
C10
C09
C08
C06
C05
EMBED
Slot
1 IOP short
2IOA
3,4 IOP/IOA/INS
5 IOP/IOA
6 IOP/IOA
1IOP
2 #9771
3 #4748
C07
7,8 IOA
C04 4 #4745
C03 5,6 #2749
C02 7 #2843
C01 8 #4838
Model 820
M-A Bridge
Bus No.
Multi-
Adapter
Bridge
#2
Multi-
Adapter
Bridge
#1
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