Have you been asked “how much bandwidth does xxxx feature use?”
You could work your way through the Lync 2010/2013 Bandwidth calculator – really, this needs to be a part of your project planning process. I mean, if you don’t, you will just be guessing. Not a good career choice. But maybe you just want to get a quick feel for what you are looking at when you roll Lync out. .
Here are some excerpts from that bandwidth calculator. Keep in mind that with Lync some of these scenarios will have multiple streams (as in one stream per client).
You can also swag the numbers to a certain degree by using this handy-dandy online tool.