Mac Pro and Firewire busses

In preparation for purchase of a Mac Pro, I tried to determine how many firewire bussess are available for the 4 ports. According to one piece of information, there is only one bus(!!) supporting all four ports.
http://developer.apple.com/documentation/HardwareDrivers/Conceptual/HWTechFireWire/Articles/FireWimplementation.html
This setup could result in some real issues when using multiple FW devices, such as cameras, etc.
Have any Mac Pro users noticed problems in using multiple FW devices or is the configuration very different than previous Mac towers?
G4 Powermac Dual   Mac OS X (10.4.7)   1G RAM,200GB scratch int, FCPS, LaCie Ext FW DL DVDburner

In most cases, the 'single firewire bus problem' is overstated. Many of us use not only the built-in single bus connected to cameras, decks and drives, but are also multiplying those ports though hubs.
I have a FW400 hub with about five drives and a camera and deck hanging off it, some looped through, and a FW800 hub with another five drives hanging off it, again, some looped through. The other FW ports are also full. I've never had a single hiccup with this setup on both a Dual G4 and Quad G5, and I would expect the MacPro to be no different. (I am exclusively talking about DV-rez work - I certainly would not expect this setup to handle higher rez material).
Specifically, it seems Canon cameras do not play well with single-bus setups - there have definitely been problems reported with them.

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