bps [bits per second]
Bps [bytes per second]
kbps [kilobits per second]
KBps [kilobytes per second]
mbps [megabits per second]
MBps [megabytes per second]
gbps [gigabits per second]
GBps [gigabytes per second]
tbps [terabits per second]
TBps [terabytes per second]

In data communications only the Metric definition of a kilobyte (1000 bytes per kilobyte) is correct. The binary definition of a kilobyte (1024 bytes per kilobyte) is used in areas such as data storage (harddisk, memory), but not for expressing bandwidth and throughput.