Technical dictionary

It is a device that is referred to as a high-capacity communication processor and it allows PC communication service or internet users to freely select the connection number according to the nature of the network. It allows various network-based services by connecting various networks of different protocols such as packet network, frame relay, TCP/IP, ATM, etc.

With collection of feedback to establish super-high speed information and communication infrastructure (APII) between APEC member nations and with the purpose to establish coordination schemes, holding a meeting in Korea during June 1996 was suggested at the APEC telecommunication working group meeting that was held in Shanghai, China in September 1995. It consists of an organizing committee and operating committee with the vice-minister of the Ministry of Information and Communication as the chairperson, four subcommittees and the executive office. The enforcement method is enforced under the exclusive charge of the Electronics and Telecommunications Research Institute with cooperation of other institutes including Korea Telecom Authority, Communications Development Institute and National Computerization Agency, etc.

It is a concept that is more developed than the packet transfer mode. It is the method of transferring and receiving a 53 byte size information unit called a cell instead of a packet. It is similar to the packet switching method in terms of transferring information unit of this size with the switching method that has integrated the circuit switching method and packet switching method and it is similar to the circuit switching method in terms of real-time processing.

The existing exchanger performs voice centered transfer where as the ATM exchanger is a high-speed information and communication exchanger that performs not only voice centered but also various multi services including high speed data, moving images, etc. at the same time. ※ ATM (Asynchronous Transfer Mode): method of transferring data by dividing information data into constant size within the frame and during the realization of B-ISDN, it can be regarded as compromise method of asynchronous transfer mode (ATM) and packet transfer mode (PTM) so that it can be applied in the most advantageous manner.

The back-bone transmission network is a communication network that connects city-to-city and city-to- suburban exchanges based on a back-bone network of public communication networks and the subscriber network is a communication network that connects exchangers with subscribers.

As it utilizes basic technology required for making the desired system, it includes high-speed application specific integrated circuits, DB processing, voice recognition, composition, natural language recognition, Multilanguage translation, knowledge processing technology, etc.

It refers to a voice telephone service (mainly city, suburbs and international telephone service through a public telecommunication network based on wired technology), packet-switched data transfer service, circuit-switched data transfer service, telex service, telegraph service, facsimile service, personal line service, etc. depending on possessed equipment or resale method under discussion for permission at WTO basic communication service negotiations.

This is a communication network which has integrated the existing communication networks of separate services including existing telephone networks, data networks, CATV networks, broadcast networks, etc. into one single network, which can effectively and economically provide various services such as high-speed data, image services, etc. ※B-ISDN: Broadband Integrated Services Digital Network Optical Transmission Device: The development of large optical transmission technology is necessary due to the diversification of service types and increase in the demand for information by subscribers due to the dawning of the new multimedia era. In particular, a transmission device with the transmission capacity of Tera(10*109)bps is required in B-ISDN.

It is constructed with broadcasting and communication equipments and it is a broadcasting and communication network that can provide information and communication services of remote metering, remote shopping, etc. in accordance with bidirectional communication. ※ P/P (Program Provider): Program provider ※ S/O (Service Operator): Service operator, ※ N/O (Network Operator): Network operator ※ Digital Converter: Subscriber access unit that allows listening of comprehensive cable television broadcasting.

SO: System Operator, it is a system that has comprehensive cable television broadcasting facilities and organizes itself by receiving programs from the program providers. It is a system that automates and improves unmanned radio wave quality and operation observation of radio stations to eliminate integrated automatic radio wave surveillance system of transmitter and to establish radio wave commands.

It is a supporting device that allows the use of external networks including CATV circuit to connect the internet, etc. with PCs in homes and offices. It generally allows the transfer of high-speed data of 10Mbps through cable networks.

Channel refers to each radio wave allocated so that it can be used at the radio station. In terms of cable channels, the concept is very similar to the circuit. For example, radio waves allocated for television broadcasting are referred to as a television broadcasting channel. If there are two or more television broadcasting stations, the allocation method allocates channels of different numbers in consideration of interference that may affect nearby broadcasting stations.

It is the method for transmitting and receiving information by setting one communication path in the event of transmitting and receiving information between transmission/ reception terminals. In other words, when the transmission side requests transmission, the exchanger maintains the communication path until the communication path to the receiving side is set and until the transmission has been completed.

There are fixed communication satellites, broadcasting satellites and mobile communication satellites involved in communication activities. A fixed communication satellite is a satellite that is used for communication relay between fixed ground stations and it is classified into an international communication satellite, an area communication satellite and a domestic communication satellite. A Broadcasting satellite is a satellite that is used to enable each household to directly receive TV program signals from the ground station. A Mobile communication satellite is a satellite that is used for satellite communication that enables direct transmission and reception between mobile vehicles such as ships, aircraft, vehicles, etc. as well as mobile vehicles and each household.

It is an intelligence communication system that stores, handles or transmits information by using telecommunication equipment, computerized accounting systems and utilization techniques of computerized accounting systems.

It is a new type of wireless phone only makes outgoing calls by using small base stations in the city through extended application of principles related to the existing household wireless phones. However, reception is not possible because it does not have the function, like existing mobile phones or car telephones, which allows consistent receiving of calls by continuously detecting radio waves even when the user is moving. The call service area is limited as it is 「Cordless Telephone 2」, which only allows outgoing calls within certain areas.

Cross-border supply, as a type of service provision method, refers to the form of providing a service from the territory of one country to another (ex: satellite broadcasting)

It is software that supports numerous users so that large amounts of data can be shared.

It refers to an electric telecommunication line that directly connects two points without going through an exchanger and it enables quick and convenient calling because the communication counterpart is fixed.

It is software that supports sharing of not only computers in one place but also computers that are far apart by connecting them.

It refers to the interchange of document information that is used between companies or public institutions by using a standardized format and code system as the electronic means between computers instead of a paper format. The EDI was promoted to increase accuracy of data, reduce data input costs, decrease postage costs and to decrease document processing tasks. The ultimate effect of EDI includes an increase in productivity, decrease in stock inventory level, improvement of customer service, improvement of fund management, shortening of ordering time, supporting of decision making, etc.

It is communication network that selects between and connects subscribers to facilitate communication※ PSTN (Public Switched Telephone Network): It is telephone network for normal telephone services provided by common communication carriers※ PSDN (Public Switched Data Network): Public subscription type digital data switching network ※ N-ISDN (Narrowband-Integrated Service Digital Network): Communication network that integrates and provides telephone, telegraph and other non-telephone services. ※ Mobile communication exchanger: Wireless telephone network for vehicles and mobile phone services※ BS (Base Station): Wireless equipment wherein the mobile terminal is directly accessed ※ Modem: Connection equipment for data communication with telephone line

It is a business that provides telecommunication services of different types and contents that are determined by the Ministerial Ordinance of Information and Communication, such as telegraph, telephone services, etc. by taking into consideration the effect on public profits and national industry, the need for the stable provision of services, etc. by installing and using telecommunication equipment and facilities

Firewall is an electronic security system that is established to protect important in-house secrets and information from the electronic eavesdropping of private networks when connecting internal computer networks with external networks such as the internet, etc.

FPLMTS: Future Public Land Mobile Telecommunication not only provides all sorts of telecommunication services such as voice, data, images, etc. linked to ultra high-speed information and communication networks and satellite communications with one terminal but also can provide mobile telecommunication systems between nations with a next-generation mobile telephone system, which is called the “Future Public Land Mobile Telecommunication System”. The FPLMTS is currently participating in the International Telecommunication Union (ITU) because there are plans to enact world standards.

The general telephone equipment cost was introduced in 1970. All subscribers share the investment cost for the establishment of a communication network once at the time of subscription and it is used as an investment source in expanding telephone equipments which are insufficient as non-interest liabilities to be returned in the event of canceling subscription. In addition, it was possible to maintain basic rates and city fares at a lower cost than the cost price due to the same system being employed as well as perform the function of security deposit for default fares.

Geostationary satellite is a satellite that seems to be stationary at all times at a certain place when viewed from the ground. It revolves around the earth in 23 hours 56 minutes and 4 seconds at the same rotation velocity of the earth at a velocity of 3km per second and 11,000km per hour. It is located at about 35,786Km height from the surface from the earth and it is mainly used for communication, broadcasting and weather observation.

It is a next-generation mobile communication service that launches multiple communication satellites 400~1,500Km above the earth to make sure there are no areas where communication is not possible and to make the whole earth fall within a single communication range. ※ Current status of major mobile satellite communication project in progress – Iridium of Motorola: participation of SK Telecom – Global star of Loral: participation of Dacom and Hyundai – ICO of INMARSAT: participation of KT, ShinSegi Telecom and Samsung – Odyssey of TRW: participation of Kumho and Daewoo

HDTV is a type of television that provides clearer images with high precision and is of a larger size due to the doubling of the number of frequency lines and increase in the picture ratio compared to existing televisions.

Unlike the existing method of sequentially processing tasks using several processors, it is a computer that has improved the speed of work by performing one task in parallel by connecting and dividing hundreds of processers in parallel.

HTML is the name of a language that is used to prepare web pages used to represent information at WWW in hypertext display makeup language. The HTML was made to define the format of electronic documents in language that describes the logical structure of a document and semantic structure described with a simple mark. All web pages accessed through the web on the internet are prepared in HTML

It is an integrated network management system that controls the whole government network at an exclusive organization (National Computerization Agency).

It is a digital communication network that can integrate and provide not only audio but also a video and data service. Economic and efficient operation of the communication network has become possible as individual communication networks with independent telephone and data networks have been established into one integrated network. The characteristic of the integrated service digital network is that the subscribers and the communication network are accessed through a single circuit and broadband integrated service digital network. (B-ISDN) is a network that has been expanded for integration acceptance of video services including video conferences, CATV, etc., through which the connection of subscribers and communication networks are being digitally accelerated and broad banding increased

It is a multimedia computer which has the intelligence to self- analyze the demands made by the user using his/her voice, pen, etc. and it can handle not only multiple simple texts but also videos, voice, images, texts, etc.

It is physical, electrical and functional connection to enable to provision of telecommunication services between operators or communication networks of different service types.

The objective of INMARSAT: International Mobile Satellite Organization is to allow for distress signals and life safety messages to be broadcast in all seas and conditions, promote the efficient management of ships and enhance maritime affairs and public communication services by providing satellite communications necessary for maritime communications. After the issue was debated by the International Maritime Organization (IMO), which is one of the Intergovernmental Maritime Organizations of the United Nations, INMARSAT was established in July 1979 as a result of the INMARSAT Agreement that was concluded in London, England; there are currently 79 member nations.

INTELSAT- International Telecommunication Satellite Organization is operated based on the investment of member nations for the purpose of providing efficient and economical communication services by constituting global communication networks using satellites. INTELSAT is an Intergovernmental Agreement Institute established in August 1964, which provides communication services for each fixed point-to-point using satellites. The headquarters is located in Washington, United States and it currently has 138 member nations.

ITU: International Telecommunication Union, as one of 14 United Nations Specialized Agencies, reviews problems of all sorts related to telecommunications of each nation in the world and aims for international cooperation, etc. for the reasonable use of radio waves, etc. It was established as International Telegraph Union in 1865 and the title was changed to the current title at the Madrid Conference in 1932. The headquarters is in Geneva, Switzerland and there are currently 184 member nations. The main task is research on all telecommunications including telegraphs, telephones, wireless communications, satellite communications, etc. as well as preparation of regulations and recommendation proposals, collection and publication of information, etc.

Computer communication is available between most nations due to the world’s largest computer communication network that can exchange information with other computers connected to each other through networks in all parts of the world by using the computer and the communication line

Partial channels are used for LMDS by adding communication channels to LMDS. Partial channels have emerged as a next-generation communication network according to trends in broadcasting/ communication in a form which has integrated the WLL that communication service common carriers of various branches of areas that use both-way communication channels have promoted and LMDS that broadcasting business operators have promoted.

It reduces the digital divide between areas by alleviating the concentration of information in capital areas by introducing information concepts to community development to promote the balanced development of the country and welfare of local residents. As it is a business to develop the regional economy and to increase the life quality of local residents, it promotes computer classes in farming and fishing villages, local public DB establishment, support for operation of local information centers, operation of local informatization promotion councils, etc. – DBS (Direct Broadcasting Satellite) Satellite broadcasting is like having a TV transmitting tower in space. It is to satellite broadcasting what Namsan Tower is to terrestrial broadcasting, and it can retransfer radio waves to earth. It is possible to watch satellite broadcasting if the general public has a receiving apparatus (antenna, television, etc.) that can receive this radio wave and this is referred to as satellite direct broadcasting. ※ Satellite Live Broadcast: This is the form of a special operator retransmitting the radio wave transmitted by the broadcasting satellite to the cable or existing ground network of many members of the public through exclusive receiving.

The satellite is classified as a stationary satellite or low earth orbit according to its orbiting height – Satellites orbiting at 35,786Kmare referred to as stationary satellites and satellites orbiting at 200 ~6000 Km are referred to as low earth orbit and the low earth orbit is usually used for earth observation, weather observation and intelligence– In order to establish mobile satellite communication networks all over the world by launching satellites at low orbit, low orbit mobile satellite communication services such as Iridium, Global Star, Project- 21, etc. are being promoted.

It is a service that has advanced e-mail services that send mutual messages between subscribers by using computer networks at a higher level. It overcame the flaws of existing e-mail services that have no inter-compatibility between other e-mail services by using international standards. Therefore, it is a public network type e-mail service that allows mutual message exchange regardless of the type of communication network or the form of terminal. ※ The DACOM-MAIL400 service of Dacom and KT-MAIL service of KT applies to this.

It provides wireless a multi-channel broadcasting service using a frequency range of 2.0~2.7Ghz, and therefore a two-way service is not available with current technology levels. Problems are inherent due to meteorological changes as a result of the restriction on the number of channels or decrease in reception due to obstacles.

Multimedia refers to a system and service that allows creation, transmission and handling of various information forms including texts, voices, music, graphics, pictures, animation, images, etc. and which are integrated. It also refers to the semiconductor used for devices that memorizes programs or data.

Multimedia database is the development of computer technology that integrates, stores and handles unstructured data such as texts, graphics, images, audio, videos, etc. Therefore, it can be applied to wide range of fields such as education, training, business, document, advertisement, broadcasting, information, entertainment, etc.

It shares a single transmission line and includes methods such as time sharing, frequency division, etc. using many input/output devices or transmitting/ receiving devices as well as with the method of transmitting telegrams of the same subject matter to numerous receivers to store transmission data to the memory. It is classified into the storage method of automatically transmitting data to the terminal of the receiver and the method of simultaneous output to several receiving terminals without storage.

Network Management System is what is controlled by the common carrier.

Frequencies that are generally used for communication (telephone) using radio waves should maintain a clear frequency band width of 16 kHz. Narrowband on the other hand refers to the utilization technology that reduces the band width of the latest radio wave utilization technology to 8.5 kHz (about half). Therefore, if the existing frequency is narrowed down, it enables efficient utilization of deficient radio wave resources because the usable frequency is doubled.

It enhances convenience and comfort by promoting the computerization of the public sector including government bodies, financial institutions, educational research institutes, etc. Each institution localizes the basic system of the computer network such as the computer, etc. by not only maintaining high efficiency but also by using the expenses spent on this service to promote the domestic information industry. Also, the service is classified into seven basic information systems including national administrative network, financial management network, education, research network, national defense digital network, etc. as an initiative to contribute to securing and maintaining national competitiveness by localizing the basic system of computer systems as well as by establishing and operating the basic information system, which is the central nervous system of the nation.

The Clinton Government newly announced “National Information Infrastructure: Agenda for Action” on September 15, 1993, by defining the information super highway of slightly obscure contents based on national information. National Information Infrastructure (NII) not only defines physical facilities (optical network or related equipment) but is also defined as a social base that has a wide range of contents, including application of information itself and standards of software networks within applications and the system as well referencing the outstanding individuals responsible for such things.

It is a system that supports the provision of the most optimal service of the using institution that stably operates the communication network through efficient operation, maintenance and management of network resources such as exchangers, transmission lines, terminals, etc., which are the components of the ultra high-speed national information and communication network.

The node is the junction of exchange circuits that can generate, transfer and repeat messages in high-speed information and communication networks. The access point is part of the node which can connect terminal equipment such as a broadband network terminating device, etc. The high-speed national information and communication network is expected to install 12 nodes and 68 access points in the 80 cities nationwide.

Packet is what divides the digital information that is to be transmitted into appropriate length and is attached with control information of the recipient address to individually divided data information. Packet communication is the method of transmitting information to the recipient address in units of this packet. It can increase line utilization because multiple users can share one circuit and it enables high-quality transmission by removing errors and by selecting transmission paths in units of the packet.

The personal computer (PC) or information communication terminal makes access to the host computer of the PC common carrier through a data communication network or telephone network. It is an accessory communication service that allows the transfer of messages between users or allows searching and posting of databases (DB) as well as home shopping, home banking, online chatting and the constitution of closed user groups (CUG), etc.

It conveniently uses a portable terminal as it is mobile telephone service that can send and receive data and videos including not only audio but also documents at anytime, anywhere with anyone and it is a universal service that can be used at a low price.

The government classified similar services among numerous services of communication common carriers into several service groups (baskets), and imposes a price capped index for each basket considering price fluctuations, productivity fluctuations, etc. It is a regulatory rating system that allows autonomous rate pricing within the upper limit range for the communication common carrier.

It is telecommunication equipment and facilities installed by a specific person for use in their telecommunication activities separate from commercial telecommunication equipment and facilities

The standardization of communication protocol that defines the necessary promise to make reliable and smooth transmission and reception of data for two-way communication between computers or computer and terminal is carried out by ITU and ISO and it is a rule that defines the order and procedure about access or signal communication with communication equipments and facilities. There are various levels and types from control level of the communication line of the protocol to control of the maintenance program.

It is a service where public institutions such as the Central Administrative Agency, Local Governments, etc. computerize the business handling process or the information provision system. There are services dealing with administrative expediency, safety planning, support for economy activation, improvement of cultural and educational condition, etc. that provided to help promote public profits.

It provides public service as it establishes databases with data possessed by public institutions such as government bodies and government investment institutions, which allows the nation to easily obtain desired information.

It is a service that allows the user to specify desired information among services provided by a PC communication company or ISP, etc. to the user’s PC without the PC communication or internet user having to search for the desired information one by one.

Personal Radio and Radio Agency is a radio station that all users can use in common within the predetermined range of technical conditions such as using frequency, antenna power, etc. Therefore, radio agency is well used for construction sites or gas delivery because it can be easily used due to the simple authorization procedure which omits temporary authorization and pre-delivery inspection.

It is a device that inter connects numerous networks by using network connection device and transition function of a communication network.

It provides all process services from planning, drawing up, establishing and operation of the information system required by companies. The SI agencies are being vitalized because there are many cases where a company does not know which device should be networked and which software should be created due to the diversification of OA devices as well as the enlargement and complication of information systems. It includes the designing of systems, selection and ordering of optimal hardware, procurement, development of application software customized for customers, etc. and businesses providing such a service are called system integrators.

The information transmitted and received for connection of the circuit is referred to as the “Signal” and the order, method, etc. according to the type of signal is referred to as the “Signal System”. ※ Subscriber loop signal system is classified into subscriber loop signal system and national signal system: The signal system of exchanger and exchange period are classified into channel associated signaling and common channel signaling. * Channel associated signaling: uses the same circuit without distinguishing between telephone circuit and signal transmission circuit * Common channel signaling: signal transmission circuit is separately composed apart from the telephone circuit and it has the advantage of reducing call connection and transit trunk occupancy time as well as making transmission of great volumes of signal information possible with the method of mutually sending signals by separately collecting them.

It is a new type of job where one can create one’s own business by using computer communication networks of the internet, etc. and takes the form of new businesses from home that started to emerge centering on well-educated professional workers of the United States and Japan in the mid-1990s.

The exchanger receives the signal from the transmission side and temporarily stores it in the memory within the exchanger. It then transmits it to the receiving side through an appropriate communication path (unused communication path). Therefore, message exchange and packet exchange corresponds to this. ※ Message exchange: As it is the method of transmitting the transmission side information after saving the information in the memory of the exchanger, it takes a long time to transmit because it is transmitted after one channel is exclusively stored after transmitting and storing information. ※ Packet exchange: It overcomes the disadvantage of message exchange and it divides the information into certain sizes (packet). The sizes are decided considering the efficiency of memory use, handling capability and delay time within the network (128 bytes of international standard) and control information such as the address of the transmission side is added for accurate transmission.

ATM(asynchronous transfer mode), The existing exchanger performs voice centered transfer whereas the ATM exchanger is a high-speed information and communication exchanger that performs not only voice centered but also various multi services including high speed data, moving images, etc. at the same time. It can be defined as an asynchronous method in technical terms. However, it is appropriate to define a super-high speed exchanger as the function of an ATM exchanger as part of a super-high speed information and communication network. ※ ATM: Certain sized frames are periodically transmitted regardless of whether there is information to be transmitted or not. The data is divided into a certain size only when there is information to be transmitted and it is the method of transmission within a frame. Super-high speed communication network in other words is a method that can be most advantageously applied when B-ISDN is realized. Therefore, it can be referred to as compromised method of synchronous transmission method (STM) and packet transmission method (PTM).

It is a test network that is provided to identify, verify and evaluate development procedures and results of technology related to application services provided through the super-high speed information and communication network. Therefore, it is a test network that supports verification of the validity and suitability of various technologies for the effective establishment of the super-high speed information and communication network.

It is a new social overhead capital that includes not only physical communication networks and information devices that can quickly transmit and receive various types of information such as voice, text, video, etc. anytime and anywhere but also includes software and its surrounding environments including social systems, utilization customs, culture, etc.

It refers to an information network system (information super-highway) that enables the public to easily use multimedia services whereby voice, text and video information by broadening, bidirectionalizing and digitalizing all communication equipments, etc. (wired, wireless, submarine fiber-optic cable, etc.) can be freely exchanged. ※ B-ISDN: next generation communication network using ATM exchanger for multimedia services such as voice, video, etc. ※Low earth orbit satellite: low orbit satellite with high altitude from several Km to several thousand Km. ※Mugunghwa satellite: stationary satellite with 36,000Km orbit for domestic broadcasting and communication services※ CATV: refer to CATV network. ※ DBS (Direct Broadcasting Service): Direct Broadcasting Service※ MMDS (Multipoint Microwave Distribution System): wireless CATV ※ Submarine fiber-optic cable: it is fiber-optic cable installed undersea for international communication ※ Mobile communication network: wireless network for mobile and car telephone services※ NT, RT: fiber-optic cable access unit necessary for multimedia communication of subscribers ※ PSTN, N-ISDN, PSDN: refer to switching network

In order to promote theinformatization of public sectors to simplify the handling of tasks, encourage public use of information, and improve government provided civil application services, etc., the government of the super-highway information network, which connects public institutions such as nation agencies, local government, etc., is planning to establish a nationwide communication network by connecting 80 major cities nationwide with super-high speed exchangers with fiber-optic cable by 2010 by inputting a total of 811.3 billion won.

It is the business responsible for performing all tasks of analyzing, consulting and designing systems based on the requirements of the consumer, development and procurement of each system elements, system integration test and installation, system operation of a certain period of time and all tasks of maintenance.

Telecommunication equipment and facilities can not only cause problems for other telecommunication equipment and facilities nearby if they are not properly installed but can also harm or damage the human body or material objects. Therefore, minimum technical requirements have been enacted for the purpose of preventing such disturbances or harm.

Telecommunication is what transmits or receives codes, terms, audio or video due to wire, wireless, radial electron or other electronic methods

It refers to transmission as channel construction equipment of transmission and reception sites for telecommunication among telecommunication equipments. Outside plant and exchange equipment integrally installed to this and affiliated equipment

Machinery, instruments and lines necessary for telecommunication and equipment necessary for other telecommunication

It is that which mediates communication by others by using telecommunication equipment or provides telecommunication equipment for communication by others

Transmission lines such as copper wire, optical fiber cable, etc. installed for the transmission of information (audio, video, data, etc.) from the communication network.

While IMT-2000 aims for a worldwide currency with one terminal, the UPT service is a personal communication service that enables people to call anywhere in the world with the numbers given regardless of communication media (terminal).

In the Telecommunications Business Act, value-added telecommunication business is described as a business providing a telecommunication service that is different from a telecommunication service prescribed as a facilities-based telecommunication business by leasing electric telecommunication line facilities from a key telecommunication business operator (Article 4 of Telecommunications Business Act and Article 3 of Enforcement Regulations of the same Act). Therefore, the key telecommunication business operator can provide all telecommunication services excluding telephone services (local call, long-distance call, and international call), telex services (telex), electric telecommunication line facility leasing services, services provided by receiving frequency allocation (mobile phone, radio paging, etc.), and telecommunication services notified by the minister of other Ministries of Information and Communication. In order to manage a value-added telecommunication business, the minister of the Ministry of Information and Communication must be notified. As of the end of 1995, 323 value added common carriers provide PC communication, internet, e-mail, electronic data interchange (EDI), credit card search, computer reservation, telephone post office box service, etc. Value-added telecommunication business in the general sense is the provision of a communication service of advanced added value such as circuit switch through integration of computer function in communication service, code conversion, computational treatment, provision of database, etc. It is commonly referred to as VAN (Value Added Network) in Korea and Japan, Enhanced Service in the United States and VADS (Value Added Data Service) in the United Kingdom.

VSAT (Very Small Aperture Terminal) is a satellite communication ground system that uses small antenna and low transmission output. It is a satellite communication system that forms the VSAT communication network along with a central office and it communicates with other VASTs using the central office and satellites. It is mainly used for data communication and it is possible to transmit music, telephone and video signals. Recently, it has been increasingly used as a data communication network that uses domestic communication satellites all over the world.

It is a conference system where several conference rooms that are geographically separated and equipped with television camera, monitor, microphone, speaker, etc. are connected with communication lines so that the situation video and audio information can be transmitted to another conference room. It is appropriate to specify it as a video conference because specifying it as an image conference is inappropriate in the sense that it does not accurately classify images which are the visual information that signifies each scene and video, which is the dynamic visual information of series. Therefore it is appropriate to specify it as a video conference because the ultra high-speed information and communication period aims for video information exchange.

The video response system uses the TV set and the exclusive keyboard as the terminal to make access with broad-band transmission (4Mhz bandwidth) between centers with terminals and video/audio file devices and it is a system that provides individual information required by users. Provision of photos and videos are possible because it uses broad-band transmission.

Wideband CDMA and CDMA have voice-oriented CDMA and multimedia CDMA capable of simultaneously processing voice, data and videos according to the service provision capability. The voice-oriented CDMA is referred to as narrowband CDMA (N-CDMA) and it was developed in Korea in May 1995 and it has been in commercial service since April 1996. Multimedia CDMA is becoming the core of next generation mobile communication with wideband CDMA (W-CDMA) and is currently being researched by electronic communication companies, etc.

It is a service that supports the establishment and operation of homepages economically by renting out a web server to a company or an individual who is having difficulty establishing a web server - due to issues related to system operation technology, professional labor force, investment costs, etc. - when they are in need of an internet homepage.

Cable television transmits TV programs with super high frequency (SHF) band without using general cable (coaxial or optical fiber) and is a new concept of a transmission medium that uses multiple antennas in each household. While the existing wireless TV channels are limited, it is possible to transmit TV programs by the number of existing cable TV channels (about 100) by using super high frequency (SHF) band.

It allows wireless transmission and reception of data such as texts, numbers, etc. using portable data communication terminals or terminals for data communication such as the laptop, PC, etc. Therefore, it is a service that allows business orders to be made to salespersons or service agents working in the field as well as inquiries about database materials, input of new information, etc. being possible at anytime and anywhere.

Based on the concept of wirelessly connecting the subscriber’s lines, it connects the base station within the communication network and between buildings of users with wireless circuits. Because it is composed in accordance with relatively short distances, it uses frequencies higher than frequencies for wireless transfer for long distances. It targets high-speed wideband signals and it is classified into an analog method and data and digital network that transfer data

It was developed in 1993 to make use of the internet more convenient. The existing service requires individual entry; however www can be easily used by utilizing the mouse