Service manual

4-16 AlphaServer GS80/160/320 Service Manual
4.4 System Box Module Location and Identification
QBB and slot identify module locations. Since global ports must be
physically close to each other, backplanes are rotated and flipped such
that slot locations shift relative to the cabinet.
Figure 4– 1 System Box Module Locations (rear)
CPU0
CPU1
CPU2
CPU3
MEM0
MEM1
MEM2
MEM3
DIR
Clock splitter
Aux power
Main power
PSM
I/O
risers
Power connect
Global p QBB1
Global p QBB0
CPU0
CPU1
CPU2
CPU3
MEM0
MEM1
MEM2
MEM3
DIR Clock splitter
Aux power
Main power
PSM
I/O
risers
Power connect
Global p QBB3
Global p QBB2
CPU0
CPU1
CPU2
CPU3
MEM0
MEM1
MEM2
MEM3
DIR
Clock splitter
Aux power
Main power
PSM
I/O
risers
Power connect
Global p QBB4
Global p QBB5
CPU0
CPU1
CPU2
CPU3
MEM0
MEM1
MEM2
MEM3
DIR
Clock splitter
Aux power
Main power
PSM
I/O
risers
Power connect
Global p QBB6
Global p QBB7
QBB 0 (blue)
QBB4 (orange)
16-P System
32-P System
QBB6 (brown)
1
1
1
1
PK1537-99
Power
Cabinet
3
3
3
3
4
4
Figure 4–1 shows module locations for QBBs at the rear of both GS160 and
GS320 systems. Figure 4–2 shows module locations for QBBs at the front of
both GS160 and GS320 systems. Note that even-numbered QBBs are located in
the back of systems and odd-numbered QBBs are in the front.