Specifications

CommPlete 4000 Communications Server Quick Start Guide 15
Installing Your CommPlete 4000
Note that the two top expansion slots share a data interrupt signal on the PCI bus. Consequently, if
both slots are used, they must be occupied with identical devices (and the device drivers must be
identical). This is a constraint of PCI bus architecture. Also, the device drivers must support
interrupt-sharing. The drivers for the MultiTech ISI card do support interrupt-sharing
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Shared Interrupt
for Top Slots.
Identical Devices Required.
Figure 2-3b. Top Slots Require Identical Devices
Serial Card Upgrades
As shown in Figure 2-3c, installation of expansion cards is simpler in the outer slots than in the inner
expansion slot.
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Shipped Configuration
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Preferred
expansion
slots
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Installing expansion card here
requires removal of card cage.
Figure 2-3c. Convenience of using outer expansion slots before the inner slot