Edit : *Traffic Usage is for free. We will restrict the connection speed to 10 MBit/s if more than 1000 GB/month are exceeded. Optional, a permanent 100 MBit/s-bandwidth will be charged 0,09 € (incl. VAT) per additional GB.
So you have a Gigabit connection which is reduced if you go over 1000 GB/month - Not much chance of that unless you stick a jukebox on there as well.
Based on a 10MBit/s connection = 10,485,760 bits per second = (divide 8.) 1,310,720 bytes per second = (divide 1024.) 1,280 Kilobytes per second.
Based on a 100MBit/s connection = 104,857,600 bits per second = 13,107,200 bytes per second = 12,800 Kilobytes per second
based on a 1000MBit/s connection = 1,048,576,000 bits per second = 131,072,000 bytes per second = 128,000 Kilobytes per second