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The gigabit per second is a multiple of the unit bit for Data Transfer Rate. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 1.0 × 109 (1 billion, short scale), and therefore 1 gigabit per second = 1.0 × 109 bit per second = 1000000000 bit per second. The gigabit per second has the unit symbol Gbit/s.
The zebibit per second is a multiple of the unit bit for Data Transfer Rate. The prefix zebi (symbol Zi) is defined in the International System of Units (SI) as a multiplier of 270, and therefore 1 zebibit per second = 270 bit per second = 1180591620717411303424 bit per second. The zebibit per second has the unit symbol Zibit/s.