Sorina,
I dont know of any white paper on network requirements for data collection. I worked at Integrien before vmware bought us, and NOBODY every talked about minimum network specs. I have seen it install and run without network issues for collection via third party and vcenter data with 10,000s objects without a network team complaint.
Cant say it wont happen, but I still havent seen any network issues.
Are you seeing some issues?