A committed data rate (CDR) is when an ISP caps your service at a static value which is most often done as a function of expense.  So you’re contracted for colo and have a half rack somewhere for 1200/month and your data rate is 100/Mbps and your ISP is going to configure your CDR at 5 Mbps.  So you get colo with 5 Mbps for 1700/month and your ISP has to do some CDR configuring.

You can read the rest of this at it’s official location on the Projects page.