IEC 80000-13:2008 is an international standard that defines quantities and units used in information science, and specifies names and symbols for these quantities and units. The standard is published by the International Electrotechnical Commission (IEC) and is part of the group of standards called ISO/IEC 80000, published jointly by the IEC and the International Organization for Standardization (ISO).^[1]

It is divided into the following chapters:

1. Scope
2. Normative references
3. Names, definitions and symbols
4. Prefixes for binary multiples

Names, definitions and symbols[edit]

Quantities defined by the standard include

• traffic intensity (symbol A): number of simultaneously busy resources in a particular pool of resources
• traffic offered intensity (symbol A₀): traffic intensity ... of the traffic that would have been generated by the users of a pool of resources if their use had not been limited by the size of the pool
• traffic carried intensity (symbol Y): traffic intensity ... of the traffic served by a particular pool of resources
• mean queue length (symbol L): time average of queue length
• loss probability (symbol B): probability for losing a call attempt
• weighting probability (symbol W): probability for waiting for a resource
• call intensity (symbol λ): number of call attempts over a specified time interval divided by the duration (ISO 80000-3 ...) of this interval
• completed call intensity (symbol μ): call intensity ... for the call attempts that result in the transmission of an answer signal

The Standard also includes definitions for units relating to information technology, such as the erlang (symbol E), bit (bit), octet (o), byte (B), baud (Bd), shannon (Sh), hartley (Hart) and the natural unit of information (nat).

Prefixes for binary multiples[edit]

Clause 4 of the Standard defines standard binary prefixes used to denote powers of 1024 as 1024¹ (kibi-), 1024² (mebi-), 1024³ (gibi-), 1024⁴ (tebi-), 1024⁵ (pebi-), 1024⁶ (exbi-), 1024⁷ (zebi-) and 1024⁸ (yobi-).

See also[edit]

• ISO 80000-1 General
• ISO 80000-2 Mathematical signs and symbols to be used in the natural sciences and technology
• ISO 80000-3 Space and time
• ISO 80000-4 Mechanics
• ISO 80000-5 Thermodynamics
• ISO 80000-6 Electromagnetism
• ISO 80000-7 Light
• ISO 80000-8 Acoustics
• ISO 80000-9 Physical chemistry and molecular physics
• ISO 80000-10 Atomic and nuclear physics
• ISO 80000-11 Characteristic numbers
• ISO 80000-12 Solid state physics
• IEC 80000-14 Telebiometrics related to human physiology

References[edit]

ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9945 9984 9985 9995 10000–19999 10006 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13407 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 -1 -2 -3 -4 -5 -6 -7 -8 -9 14649 14651 14698 -2 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17203 17369 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001:2005 27001:2013 27002 27003 27004 27005 27006 27007 27729 27799 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 80000 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 Categories ISO standards ISO 639 ISO 3166 ISO / IEC standards OSI protocols All articles with prefix "ISO"