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Topic: CCITT


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In the News (Tue 10 Nov 09)

  
  CCITT T6
In 1984, the CCITT developed a specification defining the facsimile coding schemes to be used in the Group 4 fl and white facismile.
The advantage of the CCITT T.6 coding scheme over the one-dimensional coding scheme of Group 3 facsimile is that it exploits both horizontal and vertical dependencies, resulting in the greater compression efficiency.
Since the CCITT T.4 two-dimensional coding scheme requires that every Kth line of image data must be encoded by the one-dimensional coding scheme, it is less efficient compared to the CCITT T.6 coding scheme.
einstein.informatik.uni-oldenburg.de /rechnernetze/ccitt_t6.htm   (723 words)

  
 [No title]
2 The CCITT Transmission Plan 2.1 Principles The CCITT transmission plan has been drawn up with the object of making use, in the international service, of the advantages offered by 4-wire switching considered to be met if the use of technical media other than those described give an equivalent per- formance at the international centre.
For the measurements of noise in one direction of transmis- sion, the far end of the circuit should be terminated at the cir- cuit access point, with an appropriate value of pure resistance.
Therefore, for the purpose of determining the total distortion limits for international public telephony circuits, the length of this section may be considered, from Table 4/M.580, to be equivalent to 2500 km.
www.nmedia.net /docs/ccitt/1988/4_1/4_1_10.txt   (7536 words)

  
 [No title]
The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the ITU.
The approval of Recommendations by the members of CCITT is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988).
___________________ CCITT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized private operating agency.
www.sce.carleton.ca /courses/94588/docs/X701.DOC   (9187 words)

  
 SpaceTEC® Schools to Space - Space to Schools
Formed in 1994, CCITT is a national consortium of community colleges committed to incorporating innovative technological dimensions into existing and future educational programs and services.
Collectively, CCITT colleges enroll over 400,000 students annually and are located in areas with high concentrations of technology companies employing over 350,000 technical specialists.
CCITT is a presidents' organization; the presidents of each of its 16 member colleges serve on the Board of Directors and provide direct, personal input to the consortium.
www.spacetec.org /body.asp?ID=90   (151 words)

  
 CCITT - Comité Consultatif International de Télégraphique et Téléphonique
CCITT is a acronym that can contains many meanings which are listed below.
There may be many popular meanings for CCITT with the most popular definition being that of Comité Consultatif International de Télégraphique et Téléphonique
If you have more information or know of another definition for CCITT, please let us know so that we can review it and add that information to our database.
www.auditmypc.com /acronym/CCITT.asp   (193 words)

  
 ccitt | English | Dictionary & Translation by Babylon
The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland.
Prior to 1992, it was known as the International Telegraph and Telephone Consultative Committee (CCITT, from the French name "Comité consultatif international téléphonique et télégraphique").
CCITT changed its name to ITU-T on 1 March 1993.
www.babylon.com /definition/ccitt   (114 words)

  
 CCITT (Consultative Committee for International Telephony and Telegraphy) (Linktionary term)   (Site not responding. Last check: 2007-10-08)
The CCITT is part of the ITU (International Telegraph Union), which has a history that stretches back to 1865.
The CCITT was integrated into this new structure.
Even though the ITU-T now creates recommendations and standards, the CCITT recommendations are still mentioned quite frequently, but they should be referenced as now being managed by the ITU.
www.linktionary.com /c/ccitt.html   (379 words)

  
 [No title]
Black or white run lengths, up to a maximum length of one scanning line CCITT Draft Recommendation T.4 PAGE 3 (1728 picture elements or pels) are defined by the code words in Tables 1 and 2.
The CCITT Draft Recommendation T.4 PAGE 12 arrangement of interworking between equipment conforming to Recommendation T.4 and these existing equipments is subject to further study.
Note 3: For higher speed operation, such as may be possible on leased circuits, it is provisionally agreed that Group 3 apparatus may utilize the signals specifically defined in 1, 2, 3, 4, 7, 8, 9, 11, and 12 of Recommendation V.29.
www.ietf.org /rfc/rfc804.txt   (1016 words)

  
 [No title]
The four-year approval cycle made the CCITT a rather slow and deliberate....
In the CCITT the development of R111 was finalised through the interest of the...
CCITT Comite Consultatif Internationale de Telegraphie et Telephonie...
www.howstuffworks.com /search2.php?pg=&server=www.howstuffworks.com&terms=ccitt   (172 words)

  
 RFC 804 (rfc804) - CCITT draft recommendation T.4
Black or white run lengths, up to a maximum length of one scanning line CCITT Draft Recommendation T.4 PAGE 3 (1728 picture elements or pels) are defined by the code words in Tables 1 and 2.
The CCITT Draft Recommendation T.4 PAGE 12 arrangement of interworking between equipment conforming to Recommendation T.4 and these existing equipments is subject to further study.
Note 3: For higher speed operation, such as may be possible on leased circuits, it is provisionally agreed that Group 3 apparatus may utilize the signals specifically defined in 1, 2, 3, 4, 7, 8, 9, 11, and 12 of Recommendation V.29.
www.faqs.org /rfcs/rfc804.html   (1041 words)

  
 CCITT   (Site not responding. Last check: 2007-10-08)
CCITT stands for the International Telegraph and Telephone Consultative Committee.
The CCITT defines standards for data communications for the International Telecommunication Union (ITU).
The CCITT has defined X.500, X.25, V42, and other modem and email standards.
www.comptechdoc.org /independent/networking/terms/ccitt.html   (36 words)

  
 LibTiff Mailing List Archive, "CCITT compression standard and its application in TIFF", by Joris Van Damme
Thus, I propose we should read "white" in the CCITT standard to mean 0, and "fl" to mean 1, and next we should apply the TIFF photometric, either MinInWhite or MinIsBlack, to determine what 0 and 1 mean.
In this case, the CCITT "white" runs are to be interpretated as white, and the CCITT "fl" runs are to be interpreted as fl.
Thus, CCITT "white", read to mean "0", is interpreted according to TIFF photometric to be actual white, and all is consistent.
www.asmail.be /msg0054894761.html   (1042 words)

  
 CCITT Selcal
This module is fully compliant with the CCITT recommendations for VHF SELCAL.
The first decode window is an accurate analysis of the parameters of the Selcal signal sequence.
The Date/Time stamp is followed by the actual tone channel number received, its nominal measured frequency, its frequency error, its duration in milliseconds and its measured signal to noise ratio.
www.scancat.com /ccitt_selcal.html   (87 words)

  
 ISO Protocols - ACSE | CCITT X.400 | CLNP | CMIP | ES-IS | FTAM | IDRP | INAP | IS-IS | ISO-IP | ISO-PP | ISO-SP | ...
The CCITT recommendations X.400 through X.430 define an application layer protocol and a minimal presentation layer protocol.
CCITT X.400 uses the ISO Session Layer services and protocol, documented in ISO documents IS 8326 and IS 8327, respectively.
The CCITT X.400 standard describes message transfer agents (MTAs) that are responsible for delivery of electronic mail between computers.
www.protocols.com /pbook/iso.htm   (2533 words)

  
 The CCITT G.722 Wideband Speech Coding Standard
The CCITT G.722 wideband speech coding algorithm supports bit rates of 64, 56 and 48 kbps.
In the CCITT wideband speech coder a sub-band splitting, based on two identical finite impulse response quadrature mirror (bandpass) filters (QMF) as shown in Fig
The coding of the sub-band signal is based on a modified version of the 32kbps CCITT G.721 ADPCM speech coder.
www.umiacs.umd.edu /~desin/Speech1/node3.html   (633 words)

  
 Mibble MIB Parser - Bugs: bug #16827, Symbols ccitt(0) and... [Savannah]
So my further suggestion is that for the well known symbols ccitt(0), iso(1), joint-iso-ccitt(2) Mibble should use the ones defined in DefaultContext, independently if one uses e.g.
"::= {ccitt 0}", "::= {ccitt(0) 0}" or "::= {0 0}".
MibLoader.getRootOid(int rootSymbol), where rootSymbol is one of ccitt, iso and joint-iso-ccitt.
savannah.nongnu.org /bugs/index.php?func=detailitem&item_id=16827   (443 words)

  
 Those Mysterious CCITT numbers   (Site not responding. Last check: 2007-10-08)
The CCITT (French acronym for International Consultative Committee for Telegraphy and Telephony, which is based in Geneva, a French-speaking area) uses
It is best to simply consider CCITT number of recommendations to be random, and leave it at that.
v.42 is the CCITT standard for modem communication covering negotiation for LAPM error control and support for MNP Levels 1-4 error correction.
www.wap.org /info/techstuff/ccitt.html   (312 words)

  
 CCITT - Webopedia.com
CCITT, now known as ITU (the parent organization) has defined many important standards for data communications, including the following:
The Group 3 protocol specifies CCITT T.4 data compression and a maximum transmission rate of 9,600 baud.
This brief page describes the X.25 protocol, along with links to ISO, ANSI, CCITT, and the Level 2 and 3 formats for the X.25 protocol.
ecrmguide.webopedia.com /TERM/C/CCITT.html   (423 words)

  
 CCITT T4
The main atvantage of the CCITT Group 3 two-dimensional coding over the CCITT Group 3 one-dimensional coding is that compression efficiency is improved.This is due to the fact that the two-dimensional coding explores correlation of pixels in two successive lines.
In summary, for every group of K lines, the CCITT Group two-dimensional scheme encodes 1 line in one-dimensional coding and the other K-1 lines in two-dimensional coding.
During the encoding of the coding line, the position of a0 is determined by the previous coding mode.
einstein.informatik.uni-oldenburg.de /rechnernetze/ccitt_t4.htm   (573 words)

  
 Digital Signaling Systems   (Site not responding. Last check: 2007-10-08)
In this recommendation (which is not a formal standard signaling system), DS0 #16 of the G.732 frame is used to transport a multiplexed ABCD-Bit status for each channel.
Therefore, a new HDLC-based signaling standard and CCITT recommendation was developed: Signaling System 7.
First defined by the CCITT in 1980, the Swedish PTT started SS7 trials in 1983 and some European countries are now entirely SS7-based.
telecom.tbi.net /digsig.htm   (907 words)

  
 CCITT-ISO - Distributed Multimedia Standards Part 2 - Free Computer Science Tutorials - Provided by Laynetworks.com - ...
These being progressed by full collaboration between ISO/IEC and CCITT and will extend both the content (audio, spreadsheets, colour, business graphics, specialist notations) and structural features (annotations, hypermedia support, complex tabular layout, document access and manipulation support, revision accountancy) of ODA.
Work on X.400 began in 1980 within CCITT and resulted in the publication of the 1984 Recommendations, which still forms the basis of many of the products available today.
Since then CCITT formed a collaborative partnership with ISO for the further development of the technology and published technically aligned text in 1988 (1990 in ISO) for the first major revision of X.400.
www.laynetworks.com /Multimedia-CCITT-ISO-standards.htm   (4534 words)

  
 Nabble - Audacity v1.2.6 Wav & CCITT u-Law   (Site not responding. Last check: 2007-10-08)
I've been reading for the past hour various posts dealing with exporting files as CCITT u-Law...
Seems CCITT u-Law is the encoding to use when it comes to telephone systems, it should be an mp3, but no such luck.
The first step I take after importing the mp3 is to use 'Split Stereo Track' option, then select 'mono' for both the left and right track.
www.nabble.com /Audacity-v1.2.6-Wav---CCITT-u-Law-t2649490.html   (193 words)

  
 ITU-T - Wikipedia, the free encyclopedia
Historically from 1960 until the formation of ITU-T in 1992, the Recommendations of the CCITT were presented to four-yearly "plenary assemblies" for endorsement, and the full set of Recommendations were published after each plenary assembly, in a set of volumes titled collectively for the colour of their covers.
The rise of the personal computer industry in the early 1980s created a new common practice among both consumers and businesses of adopting "bleeding edge" communications technology even if it was not yet standardized.
In the CCITT the development of R111 was finalised through the interest of the UK and USSR delegations.
en.wikipedia.org /wiki/CCITT   (2669 words)

  
 Word Searching in CCITT Group 4 Compressed Document Images
In this paper, we present a compressed pattern matching method for searching user queried words in the CCITT Group 4 compressed document images, without decompressing.
The feature pixels composed of fl changing elements and white changing elements are extracted directly from the CCITT Group 4 compressed document images.
The connected components are labeled based on a line-by-line strategy according to the relative positions between the changing elements of the current coding line and the changing elements of the reference line.
csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/icdar/2003/1960/01/1960toc.xml&DOI=10.1109/ICDAR.2003.1227709   (215 words)

  
 CCITT Compression G3/G4 - image compression SDK - CCITT .NET, CCITT API and more.   (Site not responding. Last check: 2007-10-08)
LEADTOOLS supports the CCITT Group3 and Group 4 industry standards for compressing bitonal (1-bit) image data.
Both Group 3 and Group 4 encode the source image line by line.
Imaging-Components.com is an informational website created to promote the use of LEADTOOLS "third-party" imaging software components.
www.leadtools.com /SDK/Raster/Raster-Compression-CCITT.htm   (394 words)

  
 Re: Viewing some scanned PDFs / CCITT Group 3 compression - Nitro PDF Forums
The current and previous versions of Nitro PDF Professional may have trouble displaying particular documents that have been scanned in from paper to PDF.
You may notice that a whole page is blank, or portions of a page is blank while the rest display fine.
This is an issue when CCITT Group 3 compression has been used during the scanning process.
www.nitropdf.com /forums/forums/1222/ShowPost.aspx   (208 words)

  
 [18] I need specs and source for TIFF and CCITT group 4 Fax   (Site not responding. Last check: 2007-10-08)
Specs for Group 3 and 4 image coding (group 3 is very similar to group 4) are in CCITT (1988) volume VII fascicle VII.3.
Source code can be obtained as part of a TIFF toolkit - TIFF image compression techniques for binary images include CCITT T.4 and T.6: ftp://ftp.sgi.com/graphics/tiff/tiff-v3.4beta035-tar.gz Contact: sam@engr.sgi.com There is also a companion compressed tar file (v3.0pics.tar.Z) that has sample TIFF image files.
Software for reading and writing CCITT Group 3 and 4 images is also available in directory ftp://merry.cs.monash.edu.au/pub/alanf/ Contact: Alan Finlay .
www.faqs.org /faqs/compression-faq/part1/section-16.html   (305 words)

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