Hey From looking at the screenshot the Committed Rate is shared amongst all devices on the TEL Queue. Namely 10mbps (10000 mbps) at a constant rate

Committed Burst Size is the max number of bytes that can be sent in one instant burst. Think of it like intel speedstep where your CPU will run faster than normal in very short bursts, this is how much burst you are limiting it too in bytes. You can do the working out, or just leave it :)