ISDB-T

Reading: Eye s D B tea
Full spelling: Integrated Services Digital Broadcasting-Terrestrial
Field:
Multimedia > broadcast > ISDB-T

The broadcast system which is used for the Japanese domestic terrestrial digital broadcast. With former analog ground wave television broadcasting using the system which is called NTSC, the picture and sound vis-a-vis as the analog data transmitting, with ISDB-T it transmits the picture and sound as the digital data.

With ISDB-T making use of the UHF band as frequency zone, per channel for one broadcasting station the width of approximately 5.6MHz is allotted. This channel furthermore at a time width of approximately 429KHz minute is divided into the unit which is called the segment 13, multiplexing the animated picture data of the picture quality where plural is different and the data etc other than animated picture sound in one channel, the fact that it can transmit simultaneously is major feature. It is possible, to appoint another modulation technique and the like each every segment, it is possible efficiently to utilize frequency zone.

ISDN

Reading: Eye s D n
Full spelling: Integrated Services Digital Network
Field:
Communication service > public network > ISDN/TA > ISDN

Integrating telephone and FAX and data communication, the digital network which it handles. In Japan NTT offers service with name of the “INS net”. It is standardized the International Telecommunication Union telecommunications sector (ITU-TS) by. The majority of the services which presently are offered with each country is N-ISDN which used the usual telephone line as a hardware, 3 these channels (the logical circuit) it consists. The D channel of transmission speed 16kbps (1) the B channel for control and 64kbps (2) it is for communication. Because 2 circuits you can use simultaneously, while using the telephone, you can connect to Internet. In addition, bundling 2 circuits, also it is possible to do the high-speed communication of 128kbps.

The International Telecommunication Union (ITU-TS) standardized, interface standard of the ISDN circuit. As for transmission speed 144kbps.

In Japan, the telephone line (the joining telephone network) with the same copper wire was utilized, it is the service to which “INS net 64” for home and small and medium-sized business uses BRI.

In the same way as other interface standard, it stipulates 1 these physical circuits the plural hypothetical circuits (the channel) as gathering.

As for BRI, “the B channel” of 64kbps consists of 2 and “D channel” 1 of 16kbps. This system is called “2B+D” and so on.

The B channel mainly in sending and receiving of the data and sound, the D channel it is used in order to exchange the data for line control of departure arrival and the like. Because 2 these B channels are independent, while someone using the telephone, another person connects to Internet, and so on method of using is possible.

ISDN terminal adapter

Alias:
TA and terminal adapter
Field:
Communication service > public network > ISDN/TA > ISDN terminal adapter

The personal computer and modem, analog telephone and FAX etc, that way, when connecting the communication equipment which cannot be connected to ISDN to ISDN the necessary signal shaping equipment.

ISDN rooter

Reading: Eye s D n rooter
Field:
Communication service > public network > ISDN/TA > ISDN rooter

-> Referring to the section of the dial rise rooter.

ISDN public telephone

Reading: Eye s D n like this the palpus arm it is the [wa]
Field:
Communication service > public network > ISDN/TA > ISDN public telephone

The public telephone which was connected to the ISDN circuit, can utilize data communication. By the public telephone of the frame of the gray which loads the liquid crystal picture, it appeared in 1990 March. “Gray telephone” “[gure] electricity” and so on there are also times when the popular name it is done from color of that frame.

The former public telephone was produced only audio telephone call, but in the ISDN public telephone, the terminal in order to connect the personal computer and the like in addition to audio telephone call, has been attached, it can utilize data transmission service. Communication method analog (modem) with digital (the terminal adapter) corresponds to both. In the new type there are also those of the type which connects with the infrared ray communication port.

Until recently similar, it does the payment of fee with the coin or phonecard.