Copying large files freezes other Macs on the network

Hello everyone,
since we added a Mac Pro to our network, other clients sometimes hang and have to disconnect to a server (Xserve), when we copy large files (100MB and up) to that server with the Mac Pro.
Like the other G5's, the faster G4's and some PC servers, it is connected on gigabit speed.
Can someone help me to pinpoint this problem, or give me more information on finding the cause?
Maybe this can be usefull:
We replaced the cable by a Cat6 UTP cable.
Slowing down to 100mbit did not solve the problem.
We could not reproduce the problem when connected directly to the Xserve (no switch or patch pannel, only the cat6 cable).
Many thanks in advance for your help.

Hello,
yesterday, may boss, ordered some people to check the cabling and connections in our network.
They revealed several problems and advice to replace all cabling to cat6 or cat7.
Is the MP susceptible to network imperfections? Our other G5's never suffered from network flaws (now the ethernet cards are Intel instead of 'Apple' design...)
I did some other tests, and set the MTU to 750 instead of de default 1500. Without success.
I am trying to finde som info in the logfiles, but do not seam to find any details about the network problems. Where should I look? The system log, netinfo log is empty...
Greetings,
peter.

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