Calculate bandwidth needs for Flash Media Server 3

What to consider:

– Number of simultaneous users your application must support at peak load
– Data transmission speed at which you expect your users to connect (what percent of users will be on a 56 Kbps dial-up connection, cable/DSL, or a LAN?)
– Number of audio/video streams your application will support per user
– Limitations of the server hardware and Internet connection
– Target encoding rate of the audio and video streams in your application

Flash Media Server Developer Center