7.1 DPU Backplane Jumpers
7.1.3 X-Net Jumpers
The X-Net jumpers control the X-Net connections between PE array PCBs. They
are on the bottom of the backplane, beneath PE array slots 0 through 15 on
DECmpp 12000 systems, and beneath slots 0 through 3 on DECmpp 12000–LC
systems.
When changing X-Net jumpers:
•
Only slots with PE array PCBs should have X-Net jumpers installed. Never
install any X-Net jumper on a slot that does not contain a PE array PCB.
•
The X-Net jumper installations for all occupied PE array PCB slots can
change when the number of PE array PCBs in the system changes. When you
increase or decrease the number of PE array PCBs, review the X-Net jumper
configurations for every slot containing a PE array PCB.
Figure 7–4 shows jumpering for DECmpp 12000–LC configurations. Figure 7–5
shows the X-Net jumpering for DECmpp 12000 configurations.
Figure 7–4 DECmpp 12000–LC/Sx X-Net Jumper Configurations
Single PE-array board systems
Two PE-array board systems
Four PE-array board systems
J11
J10
J09
J08
Backplane Jumpers and Upgrading PE Arrays 7–5
