| slovo | definícia |
telecommunications
(encz) | telecommunications,telekomunikace pl. Zdeněk Brož |
| | podobné slovo | definícia |
comité européen des postes et telecommunications
(foldoc) | Comité Européen des Postes et Telecommunications
(CEPT, European Conference of Post and
Telecommunications) The committee that defined the CEPT speech
compression scheme.
[Details of compression scheme?]
(1998-03-16)
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digital enhanced cordless telecommunications
(foldoc) | Digital Enhanced Cordless Telecommunications
DECT
Digital European Cordless Telecommunications
(DECT, formerly ".. European ..") A
standard developed by the {European Telecommunication
Standard Institute} from 1988, governing pan-European {digital
mobile telephony}. DECT covers wireless PBXs, telepoint,
residential cordless telephones, wireless access to the
public switched telephone network, Closed User Groups
(CUGs), Local Area Networks, and wireless local loop.
DECT defines only the radio connection between two points and
can be used for remote access to public and private networks.
Other mobility standards, such as GSM, TACS, and {DCS
1800} add the necessary switching, signaling, and management
functions that are not specified by DECT.
The DECT Common Interface radio standard is a multicarrier
time division multiple access, time division duplex
(MC-TDMA-TDD) radio transmission technique using ten {radio
frequency} channels from 1880 to 1930 MHz, each divided into
24 time slots of 10ms, and twelve full-duplex accesses per
carrier, for a total of 120 possible combinations.
A DECT base station (an RFP, Radio Fixed Part) can transmit
all 12 possible accesses (time slots) simultaneously by using
different frequencies or using only one frequency. All
signaling information is transmitted from the RFP within a
multiframe (16 frames). Voice signals are digitally encoded
into a 32 kbit/s signal using {Adaptive Differential Pulse
Code Modulation}.
The handover process is requested autonomously by the
portable terminal and the Radio Fixed Parts, according to the
carrier signal levels. A "Generic Access Profile" defines a
minimum set of requirements for the support of speech
telephony.
(http://italtel.it/catalog/data/inglese/capc_5.htm).
(1999-04-13)
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digital european cordless telecommunications
(foldoc) | Digital Enhanced Cordless Telecommunications
DECT
Digital European Cordless Telecommunications
(DECT, formerly ".. European ..") A
standard developed by the {European Telecommunication
Standard Institute} from 1988, governing pan-European {digital
mobile telephony}. DECT covers wireless PBXs, telepoint,
residential cordless telephones, wireless access to the
public switched telephone network, Closed User Groups
(CUGs), Local Area Networks, and wireless local loop.
DECT defines only the radio connection between two points and
can be used for remote access to public and private networks.
Other mobility standards, such as GSM, TACS, and {DCS
1800} add the necessary switching, signaling, and management
functions that are not specified by DECT.
The DECT Common Interface radio standard is a multicarrier
time division multiple access, time division duplex
(MC-TDMA-TDD) radio transmission technique using ten {radio
frequency} channels from 1880 to 1930 MHz, each divided into
24 time slots of 10ms, and twelve full-duplex accesses per
carrier, for a total of 120 possible combinations.
A DECT base station (an RFP, Radio Fixed Part) can transmit
all 12 possible accesses (time slots) simultaneously by using
different frequencies or using only one frequency. All
signaling information is transmitted from the RFP within a
multiframe (16 frames). Voice signals are digitally encoded
into a 32 kbit/s signal using {Adaptive Differential Pulse
Code Modulation}.
The handover process is requested autonomously by the
portable terminal and the Radio Fixed Parts, according to the
carrier signal levels. A "Generic Access Profile" defines a
minimum set of requirements for the support of speech
telephony.
(http://italtel.it/catalog/data/inglese/capc_5.htm).
(1999-04-13)
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european telecommunications standards institute
(foldoc) | European Telecommunications Standards Institute
ETSI
(ETSI) A European version of the ITU-T(?).
(1996-05-13)
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international telecommunications union
(foldoc) | International Telecommunications Union
ITU
ITU-T
(ITU) ITU-T, the telecommunication
standardisation sector of ITU, is responsible for making
technical recommendations about telephone and data (including
fax) communications systems for PTTs and suppliers. Before
1993-03-01 ITU-T was known as CCITT. Every four years they
hold plenary sessions where they adopt new standards; there
was one in 1992.
ITU works closely with all standards organisations to form
an international uniform standards system for communication.
Study Group XVII is responsible for recommending standards for
data communications over telephone networks. They publish the
V.XX standards and X.n protocols. V.21 is the same as
EIA's EIA-232. V.24 is the same as EIA's EIA-232C.
V.28 is the same as EIA's EIA-232D.
Address: International Telecommunication Union, Information
Services Department, Place des Nations, 1211 Geneva 20,
Switzerland.
Telephone: +41 (22) 730 5554. Fax: +41 (22) 730 5337.
E-mail: , (Mail body:
HELP).
(http://itu.ch/).
ITU-T standards can be obtained by FTP from {Korea
(ftp://kum.kaist.ac.kr/doc/STANDARDS/ccitt)}; UK - {Imperial
(ftp://src.doc.ic.ac.uk/pub/computing/ccitt/ccitt-standards/)},
{HENSA
(ftp://unix.hensa.ac.uk/pub/uunet/doc/literary/obi/Standards/CCITT)};
France - INRIA (ftp://croton.inria.fr/ITU/ccitt), {IMAG
(ftp://imag.imag.fr/doc/ccitt)}; {Israel
(ftp://cs.huji.ac.il/pub/doc/standards/ccitt)}; FTP USA:
UUNET (ftp://ftp.uu.net/pub/lietrary/obi/Standards/CCITT),
{gatekeeper
(ftp://gatekeeper.dec.com/pub/net/info/bruno.cs.colorado.edu/pub/standards/ccitt)},
world.std.com (ftp://world.std.com/obi/Standards/CCITT);
Australia (ftp://metro.ucc.su.oz.au/pub/ccitt); {Germany
(ftp://quepasa.cs.tu-berlin.de/pub/doc/CCITT)}; {Japan
(ftp://sh.wide.ad.jp/CCITT)};
(1995-01-16)
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telecommunications device for the deaf
(foldoc) | Telecommunications Device for the Deaf
Telecommunication Display Device
TTD
(TDD) A terminal device used widely by deaf
people for text communication over telephone lines.
The acronym TDD is sometimes expanded as "Telecommunication
Display Device" but is generally considered to be derived from
"Telecommunications Device for the Deaf". The deaf themselves
do not usually use the term "TDD", but prefer simply "TTY"
-- possibly the original term. The ambiguity between this and
the other meanings of "TTY" is generally not problematic.
The acronym "TTD" is also common [Teletype for the deaf?].
The standard most used by TDDs is reportedly a survivor of
Baudot code. It uses asynchronous transmission of 1400 Hz
and 1600 Hz tones at 45.5 or 50 baud, with one start bit,
5 data bits and 1.5 stop bits. This is generally
incompatible with standard modems.
A typical TDD is a device about the size of a small {laptop
computer} (resembling, in fact, a circa 1983 Radio Shack
Model 100 computer) with a QWERTY keyboard, and small
screen (often one line high, often made of an array of
LEDs). There is often a small printer for making
transcripts of terminal sessions. An acoustic coupler
connects it to the telephone handset.
With the falling cost of personal computers and the
widespread use of Internet talk systems, there is now
little reason to use this Stone Age technology.
[Standards? i18n?]
(2006-10-08)
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telecommunications industry association
(foldoc) | Telecommunications Industry Association
(TIA) An association that sets standards
for communications cabling.
Cables that TIA set standards for include: EIA/TIA-568A
and EIA/TIA-568B category three, four and five cable.
(http://tiaonline.org/).
[Details?]
(2000-04-24)
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virtual telecommunications access method
(foldoc) | Virtual Telecommunications Access Method
VTAM
(VTAM) A data communications access method compatible with
IBM's Systems Network Architecture.
[More detail?]
(1995-01-30)
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voters telecommunications watch
(foldoc) | Voters Telecommunications Watch
VTW
(VTW) A non-profit organisation based in New York,
founded by Shabbir J. Safdar to protect the rights of
Internet users. The VTW has actively opposed regulation of
encryption and restrictions on Internet free speech. VTW
created the animated "Free Speech" fireworks icon that has
been displayed on many web pages since June 12, 1996, the day
that a three-judge panel in Philadelphia ruled the CDA
unconstitutional.
(http://vtw.org).
(1996-11-03)
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wide area telecommunications service
(foldoc) | Wide Area Telecommunications Service
(WATS) A special service provided by an
inter-exchange carrier that allows a customer to use a
specific trunk to make calls to specific geographic zones or
to receive calls at a specified number at a discounted price.
(2006-05-01)
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