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G4 facsimile <G4>
Alias:
G4 FAX and G4 facsimile
Field:
Communication service > public network > G4 facsimile |
At one of the International Standard of FAX, digital circuit (ISDN circuit) those of business. Also transfer rate is faster than G3 standard for the analog circuit with high quality e.g., you can use the intermediate color between white and black. G4 the higher rank of G3 has become interchangeable, G4 FAX can also use as G3 FAX.
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G.992.1 <G.dmt>
Field:
Communication service > broadband > xDSL > G.992.1 |
| It was standardized, the International Telecommunication Union (ITU-TS) with as “G.992.1” in 1999 June the technical specification of ADSL. There are also times when it is called “full rate ADSL” and so on.
It was standardized as for vis-a-vis this, as “G.992.2” it is not the case, transmission speed half, but it is called “half rate ADSL”.
G.dmt descends and maximum 8Mbps, rises with direction and can actualize the transmission speed of maximum 640kbps with direction. which separates the aural signal and the ADSL signal member's house and central telephone exchange being both, because it becomes necessary, besides the fact that wiring becomes troublesome, it becomes raising cost in comparison with G.Lite of unnecessary.
G.dmt has upper compatibility vis-a-vis G.Lite, can use G.Lite with the equipment of G.dmt. The attachment specification which considers regional circumstance same as G.Lite together is decided, is for North American Annex A, for European Annex B and for Annex C.
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G.992.2 <G.Lite>
Alias:
Universal ADSL
Field:
Communication service > broadband > xDSL > G.992.2
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But as for ADSL to be already wide using the telephone line which has spread in general home, high speed the technology which does digital communication, with former standard in order to avoid the interference of the aural signal, you must install the equipment which is called in member's house, it had become the primary factor which pushes up the production cost of modem.
In G.Lite specification, transmission speed it descended and (central telephone exchange -> member's house) 1.5Mbps and the rising (member's house -> central telephone exchange) by restricting in 512kbps, without installing [supuritsuta] it reached the point where it can do communication.
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G.992 Annex A <Annex A>
Field:
Communication service > broadband > xDSL > G.992 Annex A
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G.992 which is one of ADSL standard among the incidental standards which add the stipulation which considers the communication circumstance of each area of the world, for North American ones. In addition, for European Annex B and for Japanese Annex C are prepared.
Annex A has supposed the utilization in North America, but besides the fact that it is used generally even with European each country, Tokyo [me] it is even in Japan [ri] [tsu] [ku] communication and Yahoo!
As for Annex A as for especially big special stipulation we do not have, are easy to actualize acceleration. But in order to use the frequency zone which is piled up with Japanese ISDN substantially, when ISDN communication is done at neighborhood, there is a problem that it causes extreme speed decrease and the decrease of transmission distance. |
G.992 Annex B <Annex B>
Field:
Communication service > broadband > xDSL > G.992 Annex B |
| G.992 which is one of ADSL standard (G.dmt/G.Lite), among the incidental standards which add the stipulation which considers the communication circumstance of each area of the world, for European ones. In addition, for North American Annex A and for Japanese Annex C are prepared. In order to be able to coexist European system and ADSL of ISDN, it is designed, but really the enterprise which utilizes Annex A it is many. |
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