Bit time is a concept in computer networking.
It is defined as the time it takes for one bit to be ejected from a network interface controller (NIC) operating at some predefined standard speed, such as 10 Mbit/s.
The time is measured between the time the logical link control sublayer receives the instruction from the operating system until the bit actually leaves the NIC.
The bit time has nothing to do with the time it takes for a bit to travel on the network medium but has to do with the internals of the NIC.
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