A time unit (TU) is a unit of time equal to 1024
microseconds
A microsecond is a unit of time in the International System of Units (SI) equal to one millionth (0.000001 or 10−6 or ) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available.
A microsecond is equal to 1000 n ...
.
It was originally introduced in
IEEE 802.11-1999 standard
[{{cite book , title=A Field Guide to Wireless LANs: For Administrators and Power Users , first=Thomas , last=Maufer , date=2004 , publisher=]Prentice Hall Professional
Prentice Hall was an American major educational publisher owned by Savvas Learning Company. Prentice Hall publishes print and digital content for the 6–12 and higher-education market, and distributes its technical titles through the Safari B ...
, work=The Radia Perlman Series in Computer Networking and Security Series , isbn=9780131014060 , id=0131014064 , page=144 , url=https://books.google.com/books?id=GB-87qyhc8sC&pg=PA142 , access-date=2015-10-27 and continues to be used in newer issues of the
IEEE 802.11
IEEE 802.11 is part of the IEEE 802 set of local area network (LAN) technical standards, and specifies the set of media access control (MAC) and physical layer (PHY) protocols for implementing wireless local area network (WLAN) computer com ...
standard.
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
A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. There are several different types; the simplest is an electronic circuit consisting of a ...
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).
See also
*
Binary prefix
A binary prefix is a unit prefix for multiples of units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplication by a power of ...
*
IEEE 1541
IEEE 1541-2002 is a standard issued in 2002 by the Institute of Electrical and Electronics Engineers (IEEE) concerning the use of prefixes for binary multiples of units of measurement related to digital electronics and computing.
While the Interna ...
*
Jiffy
References
External links
IEEE 802 Standardsavailable via IEEE Get Program
IEEE 802.11 Tutorial
IEEE 802.11