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Selecting the Interrupt Priority
The Microwave Switch modules generate interrupts after a channel has been
closed or opened. These interrupts are sent to, and acknowledgments are
received from, the slot 0 module via the VXIbus backplane interrupt lines.
For most applications where the Microwave Switch modules are installed in
an HP 75000 Series B or Series C mainframe, these jumpers do not have to
be moved. This is because the VXIbus interrupt lines have the same
priority and interrupt priority is established by installing modules in slots
numerically closest to the slot 0 module. Thus, slot 1 (internal to the Series
B mainframe) has a higher priority than slot 2 (also internal), slot 2 has a
higher priority than slot 3, etc.
Refer to Figure 2-2 to change the interrupt priority. You can select seven
different interrupt priority levels. Level 1 is the lowest priority and Level 7
is the highest priority. The Module’s factory setting is Level 1. To change,
clip out and remove two jumpers from the old priority location. Install and
solder two new jumpers in the new priority location (Figure 2-2 shows a
priority change from 1 to 7).
Note Both jumper locations must have the same interrupt priority level jumper
installed. Changing the priority level jumpers is not recommended. Do not
change unless specifically instructed to do so.
NOTE:
In this example, the priority
jumpers are moved from
position 1 to position 7
(lowest priority to highest
priority).
Figure 2-2. Interrupt Priority Selection
Chapter 2 Configuring the HP E1368A/69A/70A Modules 19