!v 8qZb
%QQQ_
(B1 &File From:CONVNUMCONVISFORMATCORRECTFOREIGNTORTFRTFTOFOREIGNGETRecommendation B.141)
TERMS AND ABBREVIATIONS FOR INFORMATIONQUANTITIES IN TELECOMMUNICATIONS
The CCITT,
considering
(a) that in telecommunications data transmission is more and more widely used;
(b) that the ISO is the international organization concerned with standardization in the field of data processing;
(c) that IEC Technical Committee No. 25 has requested the CMV to assist with the definition of letter symbols for terms and units used in data communication,
recommends
(1) that the CCIs should use the terms bit, baud, shannon, byte and Nbit byte with the definitions established by the ISO and the ITU and appearing in Annex A;
(2) that the term bit is synonymous with binary digit and is also used in the letter symbol for this unit; the term being an abbreviation of the English term binary digit and being adopted also in French and Spanish; for multiples of this unit and for derived units the letter symbols kbit, Mbit, kbit/s should be used;
(3) that the unit baud should have as its letter symbol Bd with possible multiples of kBd and MBd;
(4) that the unit shannon should have as its letter symbol Sh;
(5) that for the terms byte it is the task of the ISO to provide the letter symbol it judges to be necessary. In the meantime this term and its multiples should be written in full in the documents and texts of the CCIs. For example 10 kilobytes, 1 megabyte. The term Nbit byte has no multiples.
ANNEX A
(to Recommendation B.14)
A.1 binary digit, bit
F: lment binaire, bit
S: digito binario, bit
A member of a set of two elements commonly used to represent information.
Note In the interest of clarity, it is recommended that the term bit shall not be used in twocondition startstop modulation instead of unitelement.
A.2 binary digit rate, bit rate
F: dbit binaire
S: velocidad binaria
The number of binary elements transferred in a time interval divided by that time.
Note: The binary digit rate is expressed in bits per second (bit/s) and multiples of this unit.
A.3 baud (symbol: Bd)
F: baud (symbole: Bd)
S: baudio (smbolo: Bd)
The unit of modulation rate in telegraphy and data communication or the unit of line digit rate in digital transmission; when expressed in terms of this unit, the modulation rate or line digit rate equals the reciprocal of the duration in seconds of the shortest signal element or of the unit interval in a digital signal composed of signal elements of constant duration.
Example If the duration of the unit interval is 20 milliseconds, the modulation rate is 50 bauds.
A.4 shannon
F: shannon
S: shannon
A unit of logarithmic measure of information equal to the decision content of a set of two mutually exclusive events expressed as a logarithm to base two.
Example: The decision content of a character set of eight characters equals 3 shannons (log2 8 = 3).
A.5 byte octet, 8bit byte
F: octet
S: octeto (byte)
An ordered set of 8 binary digits operated upon as an entity.
A.6 nbit byte
F: multiplet nuplet
S: multibit nbit
An ordered set of a specified number of binary digits operated upon as an entity.
Note This definition is compatible with the definition of ISO (Data Processing Vocabulary, Part 4: Data Organization).
1) A similar text will be submitted to the CCIR as a revision of Recommendation 6071.
________________
PAGE2 Fascicle I.3 Rec. B.14
Fascicle I.3 Rec. B.14 PAGE1
uCONVNUMCONVISFORMATCORRECTFOREIGNTORTFRTFTOFOREIGNGETRecommendation B.141)
TERMS AND ABBREVIATIONS FOR INFORMATIONQUANTITIES IN TELECOMMUNICATIONS
The CCITT,
considering
(a) ctx9 > ^e
*
p
z
~
z()./0268EP@PGLamb<E_v8 ]
,
l

z2468&&&&
&.&&&p&&
&&&&&&&6qTable_LegendTable_Title
Table_Textenumlev1enumlev2enumlev3Table_#Figure
Figure_LegendFigure_#Figure_TitleAnnex_# Annex_RefAnnex_Title
Appendix_#Appendix_RefAppendix_Title Ref_TitleRef_TextlistitemRec # Rec TitleNormal after titlecall def title def texteEquationASN.1
ASN.1 italASN.1 Cont. head_footAn # Table_Fin!p%p%p%p%p%p%7p%7%!4U"%4U"%9
X4q
q
sV
4
7q
9
4%
4
!D"
4B
!
X^X^
8g
:`fE8 TY[f!!PostScript PrinterLPT2:PSCRIPTPostScript PrinterK
@0@X 2ddydy,D jy =yC=Rm:\WINDOW #A.@@@@heee;%
C:\WINWORD\CCITTREC.DOTpart iv of fascicle i3$rec b14 of b series and its Annex A2 pagesAfari, FeliciaAfari, Felicia