KB/s and Kbps are completely different concepts.
Note that case B is different. B is short for Byte, called byte. B is an abbreviation for bit, called bit. 1Byte=8bit。
We often say that the cable is 2M, 4M, which is expressed as 2Mb/s(2Mbps),4Mb/s(4Mbps). The download speed we often say is 128KB/s. 256KB /s。The conversion formula between them is:2Mb/s=2*1024/8==256KB/s,Kbps is bits/second,KB/s is bytes/second, so kbps divided by 8 is usually KB/s.
