User`s manual

Fan-Out

r reasons described in bullet #3 above, we recommend using a fan-

out configuration when you need to add successive PCIe expansion

systems to the host computer. This addition to the PCI bus hierarchy is

at the "peer" level of other existing expansion buses, thus adding

"breadth" to the PCI bus hierarchy, since these buses will be at the

same hierarchical level within the system configuration.

You

must ensure that you have the corresponding PCIe to PCIe

Expansion System, or chassis to connect with your host card to

support your desired configuration.

In this configu

ation, you have fewer “Toll Booths” to pass through;

therefore the latency is shorter, however you’ve “sacrificed” another

PCIe slot from the host computer, which may not always be an option.

For clarification, it is necessary

to understand that the amount

of latency caused by a PCIe switch (or a PCIe-to-PCI bridge

built into some 3

Par

y PCIe cards) is negligible

(“nanoseconds”) and will not produce any visible effect on most

systems. It is only mentioned here because of certain

specialized configurations involving unique PCIe cards with

special software drivers. The total number of logical buses that

the data must pass through COULD make a difference. See

Chapter 5 Troubleshooting

for more information if you suspect

this could be an issue w

ith one of your specialty PCIe cards.

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