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The terabit per second is a multiple of the unit bit for Data Transfer Rate. The prefix tera (symbol T) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1012 (1 trillion, short scale), and therefore 1 terabit per second = 1.0 × 1012 bit per second = 1000000000000 bit per second. The terabit per second has the unit symbol Tbit/s.
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.