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The V.23 standard was an early modem standard first approved by ITU-T precursor CCITT in 1964. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second, half-duplex at 1200 baud (Mode 2), (or at a "fallback rate" of 600 baud, mode 1) for the forward data-transmission channel, and an optional 75 baud backward channel. In some European countries, (and perhaps elsewhere), V.23 Mode 2 AFSK modulation, (without the backward channel) is used to transmit Caller ID information over POTS lines in the public telephone network.

Attributes	Values
rdf:type	work yago:WikicatModems yago:Artifact100021939 yago:ElectronicEquipment103278248 yago:Equipment103294048 yago:Instrumentality103575240 yago:Modem103777754 yago:Object100002684 yago:PhysicalEntity100001930 yago:Whole100003553
rdfs:label	V.23 (de) ITU V.23 (en) V.23 (pl) Протоколы модемной связи (ru)
rdfs:comment	V.23 – standard transmisji danych rekomendowany przez ITU-T, charakteryzujący się naprzemienną transmisją dwukierunkową pomiędzy dwoma analogowymi modemami wdzwanianymi (połączenie wdzwaniane, ang. dial-up). W modulacji użyte jest kluczowanie FSK przy prędkość transmisji do 600 lub 1200 baud przy czym przepustowość łącza może wynosić odpowiednio do 600 lub 1200 bit/s. Opcjonalny kanał transmisji zwrotnej ma przepustowość 75 bit/s. (pl) При установке связи между двумя компьютерами модемы должны предоставить друг другу информацию о скорости связи, корректировке ошибок и сжатии данных. Для этого и существуют протоколы — стандартизированные алгоритмы работы модема. (ru) Der V.23-Standard ist ein früher Modem-Standard, der 1988 von der Internationalen Fernmeldeunion ITU-T empfohlen wurde. Er verwendet Frequenzumtastung zum Kodieren und Übertragen von Daten mit einer maximalen Datenrate von 1200 Baud, Halbduplex bei 1200 Baud (Modus 2) (oder bei einer "Rückfallrate" von 600 Baud, Modus 1) für den Datenkanal und einen optionalen 75 Baud-Hilfskanal. Es werden drei Frequenzen für den 600/1200-Baud-Datenkanal definiert: * 1300 Hertz Ton für binär 1 * 1700 Hertz (Modus 1) bzw. 2100 Hertz (Modus 2) für binär 0 Für den 75-Baud-Hilfskanal werden die Frequenzen (de) The V.23 standard was an early modem standard first approved by ITU-T precursor CCITT in 1964. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second, half-duplex at 1200 baud (Mode 2), (or at a "fallback rate" of 600 baud, mode 1) for the forward data-transmission channel, and an optional 75 baud backward channel. In some European countries, (and perhaps elsewhere), V.23 Mode 2 AFSK modulation, (without the backward channel) is used to transmit Caller ID information over POTS lines in the public telephone network. (en)
dcterms:subject	Modems Telecommunications-related introductions in 1988
Wikipage page ID	1340477 (xsd:integer)
Wikipage revision ID	1096767396 (xsd:integer)
Link from a Wikipage to another Wikipage	Bell 202 modem Modem Duplex (telecommunications) Modems Minitel Caller ID Bits per second Europe Telecommunications-related introductions in 1988 Plain old telephone service Frequency-shift keying Public Switched Telephone Network ITU-T Videotex
Link from a Wikipage to an external page	http://www.itu.int/rec/T-REC-V.23-198811-I/en
sameAs	List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations List of ITU-T V-series recommendations
dbp:wikiPageUsesTemplate	dbt:More_citations_needed dbt:Reflist dbt:Telephony-stub
has abstract	Der V.23-Standard ist ein früher Modem-Standard, der 1988 von der Internationalen Fernmeldeunion ITU-T empfohlen wurde. Er verwendet Frequenzumtastung zum Kodieren und Übertragen von Daten mit einer maximalen Datenrate von 1200 Baud, Halbduplex bei 1200 Baud (Modus 2) (oder bei einer "Rückfallrate" von 600 Baud, Modus 1) für den Datenkanal und einen optionalen 75 Baud-Hilfskanal. Es werden drei Frequenzen für den 600/1200-Baud-Datenkanal definiert: * 1300 Hertz Ton für binär 1 * 1700 Hertz (Modus 1) bzw. 2100 Hertz (Modus 2) für binär 0 Für den 75-Baud-Hilfskanal werden die Frequenzen * 390 Hertz für binär 1 * 450 Hertz für binär 0 In einigen Europäischen Ländern wird V.23 Modus 2 AFSK-Modulation (ohne Hilfskanal) zum Übertragen der Caller ID verwendet. Der V.23-Standard wurde unter anderem für Videotex und Minitel sowie Bildschirmtext verwendet. Das Bell 202-Modem definiert ein ähnliches Modulationsschema mit anderen Frequenzen. (de) The V.23 standard was an early modem standard first approved by ITU-T precursor CCITT in 1964. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second, half-duplex at 1200 baud (Mode 2), (or at a "fallback rate" of 600 baud, mode 1) for the forward data-transmission channel, and an optional 75 baud backward channel. * V.23 Mode 1 AFSK uses a 1300 Hz tone (FZ) for mark (typically a binary 1) and 1700 Hz (FA) for space (typically a binary 0), and a 1500 Hz center frequency (F0). * V.23 Mode 2 AFSK uses a 1300 Hz tone (FZ) for mark (typically a binary 1) and 2100 Hz (FA) for space (typically a binary 0), and a 1700 Hz center frequency (F0). * V.23 backward channel AFSK uses a 390 Hz tone (FZ) for mark (typically a binary 1) and a 450 Hz (FA) for space (typically a binary 0). In some European countries, (and perhaps elsewhere), V.23 Mode 2 AFSK modulation, (without the backward channel) is used to transmit Caller ID information over POTS lines in the public telephone network. The 75 baud backward channel was originally envisioned for use in error correction schemes, but V.23 was also widely used in Videotex applications where the backward channel was used to send keyboard data in an asymmetrical full duplex scheme in devices such as the Minitel. (en) V.23 – standard transmisji danych rekomendowany przez ITU-T, charakteryzujący się naprzemienną transmisją dwukierunkową pomiędzy dwoma analogowymi modemami wdzwanianymi (połączenie wdzwaniane, ang. dial-up). W modulacji użyte jest kluczowanie FSK przy prędkość transmisji do 600 lub 1200 baud przy czym przepustowość łącza może wynosić odpowiednio do 600 lub 1200 bit/s. Opcjonalny kanał transmisji zwrotnej ma przepustowość 75 bit/s. (pl) При установке связи между двумя компьютерами модемы должны предоставить друг другу информацию о скорости связи, корректировке ошибок и сжатии данных. Для этого и существуют протоколы — стандартизированные алгоритмы работы модема. (ru)
gold:hypernym	Standard
prov:wasDerivedFrom	wikipedia-en:ITU_V.23?oldid=1096767396&ns=0
page length (characters) of wiki page	2496 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:ITU_V.23
is Link from a Wikipage to another Wikipage of	Prestel Telecommunications device for the deaf V23 Frequency-shift keying V.23 V23 modem
is Wikipage redirect of	V.23 V23 modem
is foaf:primaryTopic of	wikipedia-en:ITU_V.23

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