What do you think people do when they are at work? They use the same network that is used at home. I don't think it will be a problem.
There are 2 issues here though...
- When a person is telecommuting, there is a chance that they may be accessing more bandwidth-intensive sites (like video) that they wouldn't if they were at work. (You don't really think telecommuters spend
all their time working, do you?)
- If a person is working in the office, the computers they often communicate with (mail server, intranet server, etc.) are usually located on a LAN, so they don't need to use the internet. If someone is telecommuting, they may do remote access to computers in the office from home (thus creating home->office traffic that didn't exist before.)
I'm speaking from experience... when I used to telecommute, I used my home computer to log in to the office computer through a tool called VNC, thus adding to the internet traffic load. When I was actually in the office, I didn't need to use that tool.
Of course, as I said before, peak internet load is in the evening, so there is some extra capacity during daytime hours. So, it shouldn't be a problem.