Encoder Upstream Bandwidth

Hi,

I have a basic question. I just want to make sure I am thinking of
this correctly. I am setting up an camera/encoder at one IP. This
encoder stream is set to pull (media server initiates connection). I
have windows media server running at another IP (at an ISP). On the
same box, I have IIS running (this box has 20 IPs -- I set up media
server to use port 80 on a specific IP without a problem).

So we have:

camera/encoder box -> media server box -> IIS -> browser clients

My question: the camera encoder box only sends ONE stream to the
media server box no matter how many clients connect to the media
server stream via IIS, correct? This is unicast, over the internet.
In other words, I do not need to worry about the upstream bandwidth
from the encoder to media server box, correct? I do need to worry
about the bandwidth that the media server box will use if 1,000
clients connect to the stream -- but the encoder -> media server
portion will always have one single connection(?).

I just want to make sure I understand what is going on here.

Thanks,

Jack