The pebibyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix pebi (symbol Pi) is defined in the International System of Units (SI) as a multiplier of 250 (1 pebi, short scale), and therefore 1 pebibyte per second = 250 bytes per second = 1125899906842624 bytes per second. The pebibyte per second has the unit symbol PiB/s.
kilobit per second
The kilobit per second is a the unit bit for data transfer rate. The prefix kilo- (symbol k) is defined in the International System of Units (SI) as a multiplier of 103 (1 thousand), and therefore, 1 kilobit / s = 103bits / s = 1000 bits / s.