TU (Time Unit)

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A time unit (TU) is a unit of time equal to 1024 microseconds.[1] It was originally introduced in the meanwhile obsolete IEEE 802.11-1999 standard[2] and continues to be used also in newer issues of the IEEE 802.11 standard.[1]

A whole number of such units are used to describe several intervals in that standard. The use of the term is to avoid using the term "millisecond", which is about 2.4% shorter. The unit allows for maintaining intervals that are easy to implement in hardware that has a 1 MHz clock (by dividing the clock signal in half ten times, rather than operating a phase-locked loop or digital divider to divide such a clock signal by 1000).

One time unit is equal to one millionth of a kibisecond (1 TU = 10−6 Kis).

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  1. ^ a b "IEEE Std 802.11-2007" (PDF). IEEE (Institute of Electrical and Electronics Engineers). 2007-06-12. p. 14. Retrieved 2010-07-20. time unit (TU): A measurement of time equal to 1024 μs.
  2. ^ Maufer, Thomas (2004). A Field Guide to Wireless LANs: For Administrators and Power Users. The Radia Perlman Series in Computer Networking and Security Series. Prentice Hall Professional. p. 144. ISBN 9780131014060. 0131014064. Retrieved 2015-10-27.

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