Firewire 410 - No Firewire Networking?!? Options

[Kid_A]

Recently my Power Mac G5 got hung up (had to force power down) a couple of times. After some trouble shooting I realized it was happening only when the FireWire 410 was hooked up (and turned on.) I went to the M-Audio website and saw this article under the knowledge base saying that you can not network over a firewire IEEE 1394 connection while using the device. I was thrown off by this because that was saying I couldn't be hooked to (recording to) an external FW drive while using the box. I called the support line and they said this was true and that I would have to purchase a firewire 400 card to get around this problem. (He sounded a bit frustrated like I wasn't suppose to ask that question.) A couple questions. Does it sound reasonable for a firewire interface to have this limitation? Has anyone else had this problem (from what the guy said it sounds like only some people have this issue though they say no one should attempt the network connection.) Do the Presonus interfaces have this issue? Is firewire IEEE 1394 firewire 400, 800, or could be either? And lastly, does the firewire 400 port in the back of a G5 run of a seperate bus (or card) than the one on the front? If yal could let me know I'd appreciate it. Thanks!

P.S. This is my first post here at MacMusic!
P.S.S. I have up to date drivers and am running 10.4.6.