Bit Time

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 Card (NIC) operating at some predefined standard speed, such as 10 Mbit/s. The time is measured between the time the logical link control layer 2 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.

To calculate the bit time at which a NIC ejects bits, use the following:

bit time = 1 / NIC speed

To calculate the bit time for a 10 Mbit/s NIC, use the formula as follows:

bit time = 1 / (10 * 10^6) = 10^-7 = 100 * 10^-9 = 100 nanoseconds

The bit time for a 10 Mbit/s NIC is 100 nanoseconds. That is, a 10 Mbit/s NIC can eject 1 bit every 100 nanoseconds.

Bit time is distinctively different from slot time, which is the time taken for a pulse to travel through the longest permitted length of network medium.

Other articles related to "time, bit time, bits, times, bit":

Notable Events in Unix Time
... have a history of holding time_t parties to celebrate significant values of the Unix time number ... As the use of Unix time has spread, so has the practice of celebrating its milestones ... Usually it is time values that are round numbers in decimal that are celebrated, following the Unix convention of viewing time_t values in decimal ...
Year 2038 Problem - Data Structures With Time Problems
... Many data structures in use today have 32-bit time representations embedded into their structure ... are well-known data structures that have the Unix time problem ... file systems (many filesystems use only 32 bits to represent times in inode) binary file formats (that use 32-bit time fields) databases (that have 32-bit time fields) COBOL systems from the 1970s ...
Coded Mark Inversion
... It encodes zero bits as a half bit time of zero followed by a half bit time of one, and while one bits are encoded as a full bit time of a constant level ... The level used for one bits alternates each time one is coded ... of, but quite different from, Miller encoding, which also uses half-bit and full-bit pulses, but additionally uses the half-one/half-zero combination and arranges ...
Internet 0 - Implementation
... A zero bit is a one-microsecond pulse in the center of the first half of a bit time, and a one is a pulse in the second half of a bit time ... Data is sent as 8 bit bytes ... A byte is preceded by a bit time that has two pulses (at both 1 and 0 times), and ends with a bit time that has another two pulses ...

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