JP2005176343A - Direct connection telecommunication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct connection telecommunication system which deals with an analog phone call and an ISDN by utilizing a metal telephone line installed up to a telecommunication trader subscriber's house. <P>SOLUTION: This direct connection telecommunication system connects a communication terminal apparatus such as fixed telephone set, personal computer or facsimile installed in a telecommunication trader subscriber's house, a terminating device or MODEM for connecting the communication terminal apparatus to a communication network, a protector, an outdoor metal telephone line, a main wiring board, a converter, a remote multiplex subscriber line transmission apparatus, a time division multiplexer, an optical fiber communication line, an LS exchange, and an inter-station trunk line. Wiring of a wiring board MDF installed within a telephone office is switched to connect with the LS exchange (subscriber line exchange) of a telecommunication trader. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a direct connection telecommunication system using a metal line telephone line (metallic line) installed between a telecommunications carrier subscriber's home and the nearest telecommunications carrier telephone station.

  In the past, Nippon Telegraph and Telephone Public Corporation (the predecessor of Nippon Telegraph and Telephone Corporation) monopolized the telephony business, and most of the NTT regional companies such as NTT East and NTT West are directly connected to terminal landlines (Japan). Group company of Telegraph and Telephone Corporation). A telecommunications carrier who does not have a subscriber line can connect to a user's home or office landline telephone by laying a new subscriber line and connecting it to its own subscriber line switch. I have to. Under these circumstances, the principle of competition was introduced by the preferential connection system (Myline trademark), and the free competition was in the relay section, and the subscriber was an NTT regional company that is a fixed-line direct connection telecommunications carrier. The basic fee and additional service fee are paid to the NTT regional company, and only the telecommunications carrier in the relay section is selected and designated, and the communication fee is paid to the telecommunications carrier in the relay section. With this, it is difficult to say that the telecommunications business is in a free competitive environment, and it is not possible to reduce the user fee. It is necessary for the user to cancel the telephone service contract with the NTT regional company so that a directly connected telephone service other than the NTT regional company can be selected.

The Ministry of Internal Affairs and Communications published the “Study Group on Pricing” on June 17, 2003 (http://www.soumu.go.jp/s-news/2003/030617_6.html). The report refers to “direct receipt”, “from the subscriber's home, the transmission line equipment installed by telecommunications carriers other than NTT East and West, or the transmission line equipment installed by other telecommunications carriers, It is defined that the service is provided directly to the user and provided to the user (see page 60 of http://www.soumu.go.jp/s-news/2003/pdf/030617_6_01.pdf). In this specification, even if “transmission line equipment installed by NTT East / West”, NTT East and West loses the authority to use the transmission line equipment by renting the transmission line, and as a result, other telecommunications If the operator is authorized to use the transmission line equipment, it shall be included in “direct acquisition” because telecommunication carriers other than NTT East and West have the authority to use the transmission line equipment. It is.
June 17, 2003 report by the Ministry of Internal Affairs and Communications

  ISDN is widely spread in Japan as a high-speed communication that uses an existing metal line telephone line as it is for an analog telephone from a subscriber's house to the nearest telephone office. ISDN is an integrated service digital network and was specified in the 5th CCITT (current ITU-T) in 1972. A line network that can receive communication services such as telephone, facsimile, packet, and data with one existing subscriber line, one subscriber number, and one basic charge. ISDN (BRI) is a service that guarantees bidirectional 144 Kbps (64K × 2 + 16) data communication.

  One example of high-speed communication that can use a metal line for an existing analog telephone from a subscriber's home to the nearest telephone office is the ADSL service that started around 1999. ADSL is a mechanism that uses existing subscriber metal lines laid to the subscriber's house and performs data communication using a high frequency band that is not used to transmit voice. A line terminator called DSLAM is installed at the terminal and the central office, and connected to the network of the ADSL company. For this purpose, the ADSL company has "collocated" from NTT (renting the space in the telephone office where the communication equipment is installed) and "dry copper" (telephone line (copper wire) laid from the subscriber's house to the nearest telephone office. ) Is loaned to other businesses, and it is necessary to receive two services: NTT decided to provide colocation and dry copper, and the subscriber network (last one mile: the section connecting the telephone office and the user's home one by one, accounting for the majority of the total network cost. ) Has been realized. After that, NTT local companies decided to offer dark fiber (core fiber lending for relay communication lines) at a low price, which promptly encouraged ADSL operators to enter the market. The ADSL service does not necessarily use “dry copper”. The “dry copper” is used in the case of a subscriber who has an existing ISDN line and wants to receive the ADSL service while leaving the ISDN line.

  Operated by "Quick Line (trademark)" operated by Japan Telecom Co., Ltd., "Direct Line (trademark)" operated by KDDI Group, and Fusion Communications Co., Ltd. (formerly Tokyo Telephone Co., Ltd.) There is a line exchange type direct connection service using a dedicated line by NCC (a first-class telecommunications carrier of the first entry in the telecommunications business law) such as “Business Direct”. These services are provided by connecting to an NCC circuit switching network using an optical fiber or metal line of an NTT regional company or a regional NCC. These services have the following advantages: 1) Service content can provide services equivalent to those of NTT regional companies, 2) Service service areas are not particularly limited, and 3) Initial installation costs are high, and Due to the fatal disadvantage of using a dedicated line, the usage fee for the dedicated line is high, so it is limited to large corporate demand and there is no merit for small and medium-sized companies and individuals.

  As a telephone service based on direct connection, there is a line exchange type direct connection service using a CATV cable by a CATV provider such as Jupiter Telecommunications Co., Ltd. This service provides a direct connection using a CATV cable laid by the company. 1) Service content can provide services equivalent to those of NTT regional companies 2) Since CATV operators can provide them with CATV connection services and Internet connection services, both initial installation costs and call charges are low 3) There is a disadvantage that the service providing area is limited to an area that provides the CATV service.

  IP using NTT subscriber lines such as KDDI (trademark), Japan Telecom (trademark), NTT-COM (trademark), Fusion (trademark), Yahoo BB (trademark), etc. as a telephone service by direct connection There is a direct telephone connection service. This is a service that uses an NTT subscriber line (line sharing) and provides an IP telephone by superimposing it on the NTT telephone service. The IP telephone service has the advantages that 1) the service providing area is not particularly limited, 2) the call charge is inexpensive, and 3) it cannot receive calls from telephones provided by other operators. (It is expected that it will be possible to receive calls with 050 numbers in the future, but even in this case, it will be received via the lines of NTT regional companies.) 4) Call to emergency calls such as 110, mobile phones, PHS, and pagers (trademark) 5) Cannot make calls to special numbers such as 0120 (free dial), 0990 (Dial Q2 trademark), etc. 6) Adopting IP method (voice transmission method using IP network), so the call quality is bad In addition, in order to make up for these shortcomings, it is necessary to continue the telephone service of NTT regional companies, and basic fees and additional service fees must be paid to the NTT regional companies. In other words, IP telephones are not a complete replacement for conventional NTT regional company telephone services, and there are problems related to connectivity with other telephones and support for important communications until these are completely resolved. IP telephone users are forced to use a conventional landline telephone together. In other words, although IP telephones can provide a call function service, they cannot fulfill all the roles of conventional fixed telephones.

  In the past, even though it was said that “the fixed-line carrier charges the fixed-line mobile phone,” the fixed-line carrier can set the user charge only for the relay part. I couldn't expect much lower fees. A system that realizes a direct telephone service on a fixed telephone can solve this problem.

  The problem to be solved by the present invention is the realization of a direct connection telephone service in a fixed telephone that satisfies the following conditions. (1) To provide both analog telephone and ISDN services provided by NTT regional companies (2) Additional services such as call quality and calling number notification, to other companies' fixed-line phones, mobile phones, PHS, and pagers The same level as NTT regional companies for emergency communications to police (110), fire department (119), etc. (3) Make the service available area as wide as possible (4) Individual In order to make it possible for small and medium-sized businesses to use it, it is necessary to eliminate the need for work in the user's home such as wiring, installation and improvement of equipment and machinery.

  The effect of the present invention is that a service equivalent to a fixed telephone provided by an NTT regional company can be provided as a direct connection telephone service that can be easily used by anyone at any low cost.

  The reason why the above-mentioned low fee can be realized is as follows. The interconnection charge for 2003 is 5.36 yen / 3 minutes for ZC (zone center) (relay switching center) connection and 4.37 yen / 3 minutes for GC (group center) (subscriber exchange) connection. . When both the caller and the callee use a telecommunications carrier that implements the present invention, the burden of interconnection charges is zero. If one of the caller and the callee uses a telecommunications carrier that implements the present invention, it costs half the price when both the caller and the callee use. In addition, the Telecommunications Business Law stipulates that NTT network companies, which are designated telecommunications carriers, open access networks (opening of building space by colocation, MDF connection, dark fiber as an optical transmission path between stations, In addition, it is required to open a dry copper which is a subscriber terminal line), and by using these, it is possible to procure inexpensively by renting a transmission network without making an excessive initial investment. Furthermore, the cost can be further reduced by using an RT apparatus or a TDM apparatus.

  A telecommunications carrier implementing the present invention will be able to collect a monthly basic usage fee from the subscriber who selects it. IP telephone direct telephone service using NTT subscriber lines (provided by Shindenden, NTT Communications, Yahoo BB, etc. (both are trademarks)), although the call charges are low, the following problems are completely solved: Not. That is, it is not possible to make a call to an emergency call, mobile phone, PHS, or pager. These must be transmitted using NTT regional companies. Calling to special numbers (0120, 0990, etc.) is impossible. Call quality is inferior to landline phones. In order to deal with these problems, it is necessary to use a fixed telephone of a conventional NTT regional company. In other words, basic usage fees and additional service usage fees must continue to be paid to NTT regional companies. In the present invention, since it is possible to provide a service equivalent to that of the NTT regional company, the subscriber can cancel or suspend the telephone contract with the NTT regional company. The subscriber can make a contract with a telecommunications carrier implementing the present invention on behalf of the NTT regional company, and the telecommunications carrier can collect a basic usage fee from the subscriber.

  In the present invention, a dry copper is used. The telephone line (copper wire) owned by the NTT local company, which is a telecommunications carrier laid from the telephone office to the subscriber's house, is borrowed (meaning the original “dry copper”), including the telephone frequency band. The present invention is the first to utilize. There is no use of such a dry copper prior to the filing of the present application. Conventionally, the borrowing of a telephone line (copper line) subscriber line has only been used by a DSL operator as a so-called line sharing of a part not used for telephone service (only a frequency band necessary for DSL). In the present invention, all telephone lines (copper wires) including the frequency band of voice transmission are borrowed. By using the dry copper, it is possible to provide a service nationwide without limiting the service providing area. This is because the last one mile can be used at low cost without laying a subscriber line from the station building to the user's house. Also, the use of dry copper makes it possible to provide all services from analog telephone services centered on personal use to ISDN (PRI) services centered on large consumers.

  In the present invention, RT (remote terminal: remote multiplex subscriber line transmission device) and TDM (time division multiplexer: time division multiplexing device) are installed. By using RT and TDM, it is possible to significantly reduce the cost related to the transmission path. A variety of signals sent from a large number of subscribers' homes are once collected by an RT device, and the signals are converted into optical signals by TDM and multiplexed. As a result, the number of cores used for dark fibers (borrowing non-operating optical fibers from NTT regional companies) connected at the office can be suppressed to a minimum of two cores.

  In the present invention, a circuit is connected through a circuit switch of a telecommunications carrier, that is, a circuit switching system is used. By adopting a circuit switching system, high voice quality can be maintained, additional services such as calling number notification, etc., outgoing / incoming calls with other telephones (mobile phone, PHS, pager), police (110) The same service as that of NTT regional companies is also possible for outgoing calls to the fire department (119).

  In the present invention, it is possible to provide analog telephone services, ISDN (BRI) and ISDN (PRI) services provided by NTT regional companies by adopting a circuit switching system. ISDN (BRI) is a basic interface of 2B + D, which can use two information channels (B) and one control channel (D), and is a communication service mainly for individuals and small businesses. ISDN (PRI) can use 23 information channels and one control channel, and is a communication service mainly for large-scale businesses.

  In the present invention, the following procedure is used to implement the present invention for a subscriber's house using an analog telephone of an NTT regional company. In the MDF (main distribution frame) connected to the NTT regional company through the dry copper from the analog telephone in the subscriber's home, the wiring to the NTT regional company is cut off, and the telecommunications carrier other than the NTT regional company Change the wiring. In more detail, the wiring change to the MDF is as follows. That is, the connection in the conventional MDF is that the terminal line side terminal board H of the MDF connected to the subscriber home line is connected to the terminal board V side of the MDF subscriber line side connected to the exchange in the NTT telephone office. Is done. This connection is made by the MDF subscriber in which the terminal line side terminal board H of the MDF connected to the subscriber home line is connected to the LS switch (subscriber line switch) of the telecommunications carrier implementing the present invention. The connection is changed to the terminal board V on the wire exchange side. As a result, the subscriber's home transmission path is connected via MDF to the RT equipment and TDM equipment installed by the telecommunications carrier implementing the present invention, and the inter-station relay transmission path (optical fiber) is connected. It will be connected to the LS switch via this. By taking these measures, subscribers who use analog telephones do not need to work on the subscriber's premises (wiring, installation or improvement of equipment / machines, etc.) except for ISDN (PRI) for large-scale businesses. It becomes.

  The procedure for carrying out the present invention for a subscriber's home using the ISDN of an NTT regional company is as follows. NTT regional companies have adopted a ping-pong transmission method (TCM transmission method = time division multiplex transmission method) developed for ISDN (BRI). In Western countries, the ISDN of the echo canceller transmission system is adopted. In the present invention, an echo canceller type RT apparatus is used. Therefore, a device for converting a signal sent by the ping-pong transmission method into an echo canceller method is essential. In order to eliminate work in the user's house and also realize cost reduction, a conversion device that can be installed on the side of the RT device installed in the telephone station and that can process conversions for multiple users is required. . The applicant has newly jointly developed this conversion device, and this conversion device is also used in the present invention. By taking these measures, for subscribers who use ISDN (BRI), construction (wiring, installation and improvement of devices / machines, etc.) in the subscriber's home becomes unnecessary.

  Twenty-three information channels and one control channel can be used. In ISDN (PRI), which is a communication service mainly for large-scale businesses, most of the information is transmitted from the subscriber's home via an optical fiber. Metal lines are only used in exceptional cases when it is difficult to install optical fibers. In the case of using a metal line, an NTT regional company adopts a high speed digital subscriber line (HDSL) transmission method. The RT device used in the present invention adopts an SHDSL (single pair high bit digital subscriber line) transmission system in terms of specifications. Therefore, it is necessary to cope by replacing the modem in the subscriber's home with an SHDSL compatible type.

  The present invention relates to a communication terminal device such as a fixed telephone, a personal computer, or a facsimile installed in a subscriber's house, and a line terminator or modem for connecting the communication terminal device to a communication network (modem and line terminator are synonymous). ), Protector, outdoor metal wire telephone line, main distribution board, converter, remote multiplex subscriber line transmission device, time division multiplex device, optical fiber communication line, LS (subscriber line) ) A direct connection telecommunications system that connects the exchange and the inter-station trunk line. The converter has a function of mutually converting an ISDN transmission method into a ping-pong transmission method and an echo canceller method.

  In the case of a fixed telephone, the communication terminal device such as a fixed telephone, a personal computer or a facsimile is connected to a company-user responsibility demarcation point, which will be described later, via a telephone line modular jack. For digital equipment such as a personal computer or a facsimile, it is converted from digital to analog by a terminating device or a modem, which will be described later, and connected to a maintenance branch point. When a modem is connected, it is further connected between the modem and a digital device such as a personal computer or a facsimile by an exchange facility for building use.

  The terminator or modem has a function of converting a general digital signal into a communication line signal in accordance with a communication device such as a fixed telephone, a facsimile, or a personal computer.

  The maintenance branching point, which is an intermediary means, is used to classify maintenance responsibilities between the communication terminal device user and the telecommunications carrier in the event of a problem, and is an important branching point for quick processing of troubles. It becomes a point to distinguish between the problem on the line and the problem on the communication terminal equipment.

  The protector is installed at the end of an outdoor line, which will be described later, and has a function of protecting indoor communication terminal equipment from external troubles such as lightning or surge.

  Generally, a metal wire is used as the outdoor line. Metal wires are originally intended for voice transmission, and the quality for voice transmission is very good. The metal line telephone line is a facility for connecting a main wiring board (to be described later) in the telephone exchange to a protector installed on the user side. Generally, it is a facility owned by an NTT regional company, and when it is used by a telecommunications carrier other than the NTT regional company, it will be used after a separate contract. In the present invention, the outdoor metal telephone line is rented from an NTT regional company as a dry copper.

  The main wiring board is installed between the telephone line and the exchange in the telephone office of the NTT regional company, and has a function of a wiring distribution device for organizing cables because it needs to accommodate a large amount of cables. Yes. Here, when implementing the present invention, by changing the line to the NTT regional company in the main wiring board to the line to the direct connection telecommunications carrier, the exchange of the NTT regional company is not used. Telecommunications can be performed.

  The remote multiple subscriber line transmission apparatus is an apparatus that performs the following processing depending on the type of communication signal. In the case of an analog signal, the analog signal is converted into a digital signal and a line concentrating process is performed. In the case of a digital signal, the concentrating process is performed with the digital signal as it is.

  The time division multiplexing apparatus is an apparatus that converts a signal transmitted from the remote multiplex subscriber line transmission apparatus into an optical signal and multiplexes the optical signal. The multiplexed signal is transmitted to an optical fiber communication line described later.

  The optical fiber communication line is an optical communication network for inter-station relay that transmits a large amount of data held by an NTT regional company. Since a large amount of optical fiber is laid, it involves huge laying, and therefore enormous costs are incurred. In the present invention, in order to minimize costs, in principle, only two cores are rented as dark fibers.

  The LS switch (subscriber line switch) receives data transmitted through the optical fiber communication line via the time division multiplexer and connects it to a predetermined line of a direct connection telecommunication carrier communication network. It is.

  Among the above, an arrangement has been made with an NTT regional company so that the outdoor line can be rented as a dry copper and the optical fiber communication line can be rented as a dark fiber at a lower cost than the NTT local company. Regarding the installation of remote multiplex subscriber line transmission equipment and time division multiplex equipment, an arrangement has been made with an NTT regional company so as to secure a cheap installation space within the NTT regional company by colocation.

  A specific embodiment will be described with reference to FIG. FIG. 1 is an overall configuration diagram of a direct access telecommunication system 1. FIG. 2 is an overall configuration diagram of a connection form of a conventional NTT regional company (telecommunications carrier (A)). The analog telephone line is connected to an NTT exchange such as D70 and is connected to a communication network of an NTT regional company.

  Communication terminal equipment such as fixed telephone 2, personal computer 3 or facsimile 4, DSU 5 or modem 6 for connecting the communication terminal equipment to a communication network, maintenance branching point 8, protector 9, and outdoor metal telephone line 10 A main distribution board (MDF) 11 installed in the NTT telephone office, a remote multiplex subscriber line transmission device 12, a converter 13, a time division multiplexing device 14, an optical fiber communication line 15, a subscriber line switch ( LS switch) 16 is connected. Although the equipment configuration is partially different between the analog fixed telephone 2 and the personal computer 3 or the facsimile 4 used in ISDN or the like, in the following description, in the case of the analog fixed telephone, ISDN (BRI), ISDN (PRI), in order. explain.

  FIG. 3 shows an embodiment of a direct connection telecommunication system when an analog fixed telephone 2 is used in a subscriber's house. Since the fixed telephone 2 is an analog communication terminal device, it is directly connected to the security branch point. The remote multiple subscriber line transmission device (RT) 12 converts an analog signal into a digital signal. FIG. 4 is a connection explanatory diagram of an analog telephone of a conventional NTT regional company. The outdoor metal telephone line is connected to an NTT exchange such as D70 via a main distribution board, and is connected to a communication network of an NTT regional company.

  An outdoor metal telephone line 10 connected from a subscriber's home using the analog fixed telephone 2 to a main wiring board (MDF) 11 installed in the nearest NTT regional company telephone station is connected to the main wiring board (MDF) 11. , Disconnect the connection to the switch of the NTT area company (where, the switch of the NTT area company means the subscriber line switch (a) of the telecommunications carrier (A)). Next, an operator (telecommunications carrier (B)) other than the NTT regional company uses the terminal line side terminal (H) 17 connected to the outdoor metal telephone line 10 of the main wiring board (MDF) 11 for telecommunications. Replacing the jumper line to the subscriber line switch side terminal (V) 18 of the MDF connected to the remote multiple subscriber line transmission equipment (RT) 12 installed in the NTT regional company telephone station which is the operator (A) Connect by. This jumper line replacement work will be done by consigning to the NTT regional company that manages the telephone office.

  The subscriber line connected to the subscriber line switch side terminal (V) 18 of the MDF is an analog dedicated package (not shown) of the remote multiple subscriber line transmission apparatus (RT) 12 installed in the telephone office. ) To convert analog signals to digital signals.

  Signals sent in the remote multiplex subscriber line transmission device (RT) 12 are collected (bundled signals) and sent to a time division multiplexing device (TDM) 14. The time division multiplexing device (TDM) 14 converts the received signal into an optical signal, further multiplexes it to 150 or 600 megahertz, and converts it into an SDH (SYNCHRONUS DIGITAL HIERARCHY / synchronous digital hierarchy) system. The signal is transmitted from the telephone office via a communication network of an optical fiber communication line installed or leased by a business operator other than the NTT regional company, and the business operator other than the NTT regional company (that is, a telecommunications business operator ( B)) is transmitted to the LS switch 16 installed (here, the LS switch 16 means the subscriber line switch (b) of the telecommunications carrier (B)).

  The signal transmitted to the LS switch 16 is transmitted to the GS switch or LS switch installed by the NTT local company on the receiving side or another provider via the communication network of the optical fiber communication line installed or leased by the provider, or the provider. It is transmitted to a communication terminal such as a fixed telephone on the receiving side through another LS exchange or the like.

  The maintenance branch point 8 is used to analyze and isolate the problem by classifying the communication terminal device user and the telecommunications carrier when a problem occurs, and is an important branch point for quick processing of trouble. It becomes a point to distinguish whether it is a problem on a communication line or a problem of a communication terminal device.

  The protector 9 is installed at the end of an outdoor line 7 to be described later, and has a function of protecting the indoor communication terminal device 2 from an obstacle from the outside.

  The outdoor metal telephone line 10 connects the main wiring board (MDF) 11 of the nearest telephone office and the protector 9 installed on the subscriber's house side. Generally, it is a communication facility owned by an NTT regional company.

  By using the outdoor metal telephone line 10 not only in the frequency band necessary for digital transmission but also in including the telephone frequency band, providing the same quality as the fixed telephone provided by NTT regional companies. Can do. The outdoor metal telephone line 10 is a so-called “dry copper”, and is a subscriber line that is obliged to be opened by an NTT regional company.

    The main wiring board (MDF) 11 is installed between a telephone line and an exchange in a telephone office of an NTT regional company. Since it is necessary to accommodate a large amount of telephone lines, it has a function of wiring distribution for organizing cables. In carrying out the present invention, a line connected to an NTT regional company (that is, a telecommunications carrier (A)) in the main wiring board (MDF) 11 is connected to an operator other than the NTT regional company (that is, telecommunications). By changing the wiring to the line of the business operator (B), it becomes possible to perform telecommunications without using an exchange of an NTT regional company. As a result, it is possible to cope with only the wiring change work of the main wiring board (MDF) 11 in the telephone office of the NTT regional company, and the work on the user side becomes unnecessary.

  The remote multiple subscriber line transmission device (RT) 12 is a device that performs the following processing depending on the type of communication signal. In the case of an analog signal, the analog signal is converted into a digital signal and a line concentration process is performed. In the case of a digital signal, the concentrating process is performed with the digital signal as it is.

  The time division multiplexing device (TDM) 14 converts the digital electrical signal transmitted after the concentration processing from the remote multiple subscriber line transmission device (RT) 12 into an optical signal, and multiplexes the optical signal. It is a device to apply. The multiplexed optical signal is transmitted to an optical fiber communication line 15 described later. For this transmission, the optical fiber communication line 15 is leased as a dark fiber from an NTT regional company. In general, the minimum number of core wires used is sufficient, and the cost can be greatly reduced.

  The optical fiber communication line 15 is an optical communication network that transmits a large amount of data held by a communication carrier other than the NTT regional company. Since a large amount of installed optical fibers involve large-scale installation, the burden of depreciation and maintenance costs is large. However, by renting them as so-called dark fibers, it is possible to significantly reduce costs.

  The subscriber line switch (LS switch) 16 receives the optical signal received via the optical fiber communication line 15 after returning the signal multiplexed by the time division multiplexer 14. The subscriber line switch (LS switch) 16 can be connected to a desired line via a communication network of a telecommunication carrier other than the NTT regional company.

  Among the above, the outdoor metal telephone line 10 is rented from an NTT regional company as a so-called dry copper.

    Among the above, the optical fiber communication line 15 is rented from an NTT regional company as a so-called dark fiber.

  Among the above, the remote division subscriber line transmission apparatus (RT) 12 and the time division multiplexing apparatus 14 installed in the NTT telephone office are so-called collocation space in the telephone office of the NTT area company by arrangement with the NTT area company. Secure.

  FIG. 5 is an embodiment of a direct access telecommunication system for use with ISDN (BRI) in a subscriber's home. In the subscriber's house, a DSU (Digital Service Unit) 5 which is an indispensable facility for using ISDN (BRI) is provided. In ISDN (BRI), an audio analog signal is converted into a digital signal in a DSU (Digital Service Unit) 5. FIG. 6 is a connection explanatory diagram of ISDN (BRI) of a conventional NTT regional company. The outdoor metal telephone line is connected to an NTT exchange such as an ISM via a main distribution board, and is connected to a communication network of an NTT regional company.

  As in the case of a subscriber's house using an analog fixed telephone 2, an outdoor metal telephone line 10 which is a subscriber line connected to a main distribution board (MDF) 11 installed at the nearest NTT regional company telephone station is connected. In the main wiring board (MDF) 11, the connection to the switch of the NTT regional company is cut off. Next, a remote multiplex subscriber line transmission device (RT) in which a terminal line side terminal (H) connected to the outdoor metal telephone line 10 of the main wiring board (MDF) 11 is installed by an operator other than the NTT regional company. 12 is connected to the subscriber line switch side terminal (V) of the MDF to be connected to the MDF by replacing the jumper line. This jumper line replacement work will be done by consigning to the NTT regional company that manages the telephone office.

  Thereafter, from the subscriber line switch side terminal (V) 18 of the main distribution board (MDF) 11, the remote multiplex subscriber line is passed through a converter 13 having a function of mutual conversion of a ping-pong transmission system to an echo canceller system. Connect to the transmission device (RT) 12.

  Among the above, the converter 13 has a function of converting the ping-pong transmission method into the echo canceller method, and conversely, a function of converting the echo canceler method into the ping-pong transmission method. In Japan, the ping-pong transmission method has been adopted by the NTT regional company as the transmission method of ISDN. On the other hand, the echo canceller system is widely used in Europe and America. By converting the ping-pong transmission method to the echo canceller method, it becomes possible to procure and use the relay equipment for the echo canceller method that is generally used and widely used in Europe and the United States at a low cost. Thus, by using the converter that converts the ping-pong transmission system to the echo canceller system, the cost required for relaying can be greatly reduced.

  Since the subscriber's home uses a ping-pong transmission device, it is necessary to convert the echo canceller method to the ping-pong transmission method in order to transmit to the subscriber's home. Therefore, the converter 13 needs to have a function of mutually converting the echo canceller system and the ping-pong transmission system.

  In ISDN (BRI), the transmission path and transmission method after the remote multiplex subscriber line transmission device (RT) 12 are the same as in the case where the analog fixed telephone 2 is used at the subscriber's home (FIG. 3). .

  FIG. 7 is an embodiment of a direct access telecommunication system for use in ISDN (PRI) at a subscriber's home. ISDN (PRI) can use 23 information channels and one control channel, and is a communication service mainly for large-scale businesses. For this reason, a private branch exchange (PBX) 7 is generally installed at the subscriber's home. FIG. 8 is a connection explanatory diagram of the conventional ISDN (PRI) of the NTT regional company. The outdoor metal telephone line is connected to an NTT exchange such as an ISM via a main distribution board, and is connected to a communication network of an NTT regional company.

  In the case of ISDN (PRI), a private branch exchange facility (PBX) 7 can be provided to connect to a large number of communication terminal devices. A large number of communication terminal devices such as a fixed telephone 2, a personal computer 3 and a facsimile 4 can be connected simultaneously. Can be used for business use.

  In ISDN (PRI), in order to convert the HDSL transmission method into the SHDSL transmission method at the subscriber's home, the modem is replaced with an SHDSL compatible modem. The wiring switching in the main wiring board (MDF) 11 is the same as in the case of the analog fixed telephone 2. The difference in the case of the analog fixed telephone 2 is that the transmitted signal has already been digitized. In the ISDN (PRI), unlike the ISDN (BRI), the wiring is switched directly to the remote multiple subscriber line transmission device (RT) 12 without passing through the converter 13.

  In ISDN (PRI), the transmission path and transmission method after the remote multiple subscriber line transmission device (RT) 12 are the same as those in the case where the analog fixed telephone 2 is used at the subscriber's home (FIG. 3). .

  In the private market, fixed-line telephone service is provided only by NTT regional companies except for some CATV operators. (The CATV operator only offers a slightly lower usage fee than the NTT regional company only in the areas where the subscriber line can be laid. Direct telephone service of the new electric power company is a dedicated line of the NTT regional company. Therefore, it is not possible to expect the benefit of reducing call charges even if individuals with few calls use it.) Therefore, the new direct phone service according to the present invention makes it easy for anyone in a wide area to call charges. Since a significant reduction can be realized, many benefits are given to a large number of individual users. In the group / corporate market, NTT regional companies offer ISDN (PRI) with a low unit price per line. Shindenden, on the other hand, sells two types of direct-line telephone services for large consumers. One is to connect the user's home and the new electric power company with a dedicated line of the NTT regional company. The call charge can be reduced, but the basic charge is high. (Because the leased line usage fee paid to NTT regional companies is high.) The other is a direct-acquisition telephone service for IP telephones superimposed on ADSL. The price is low, but it is inferior to the fixed telephone function in terms of voice quality and connectivity to fixed telephones and mobile phones. The overwhelming price advantage of the direct telephone service according to the present invention is clear even when compared with the telephone service of NTT regional companies or Shindenden company. In particular, there is a great need for small and small corporations that cannot receive ISDN (PRI) from NTT regional companies and direct telephone service from Shindenden. The direct telephone service according to the present invention does not lose its price advantage even when compared with IP telephones that are rapidly increasing the number of subscribers. Moreover, IP telephones have not yet reached the standard provided by fixed telephones in terms of connectivity with other telephones (fixed telephones and mobile phones), emergency calls, additional service functions, and voice quality. Until these problems are solved, IP telephone users are forced to use conventional fixed telephones together. (You must continue to pay basic usage fees and additional service fees to NTT regional companies.) In addition, when the NTT regional companies transition to this business model, installation of special machinery and equipment, There is no need for improvement work or improvement / replacement of private branch exchanges (PBXs) used by large-scale businesses. There is no special obstacle to the transition to this business model. In view of the above, the industrial applicability of direct-to-phone service using this business model is extremely high.

Overall configuration diagram according to an embodiment of the present invention Overall configuration diagram of conventional NTT regional company connections Example of an analog telephone according to an embodiment of the present invention Connection diagram of conventional analog telephones of NTT regional companies Example of ISDN (BRI) according to an embodiment of the present invention Connection diagram of conventional NTT regional company ISDN (BRI) Examples of ISDN (PRI) according to embodiments of the present invention Connection diagram of conventional NTT regional company ISDN (PRI)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Direct connection telecommunication system 2 Fixed telephone 3 Personal computer 4 Facsimile 5 DSU (digital service unit)
6 Modem 7 Private branch exchange (PBX)
8 Maintenance branch point 9 Guard 10 Outdoor metal telephone line 11 Main wiring board (MDF)
12 Remote multiple subscriber line transmission equipment (RT)
13 Converter 14 Time Division Multiplexer (TDM)
15 Optical fiber communication line 16 Subscriber line switch (LS switch)
17 MDF (H) main wiring board terminal line side terminal 18 MDF (V) main wiring board subscriber line switch side terminal

Claims (5)

A subscriber's analog telephone of the telecommunications carrier (A),
From the analog telephone to the nearest telecommunications carrier (A) the terminal line side terminal of the main wiring board installed at the telephone station;
Metal wire phone line from the analog phone to the terminal line side terminal,
A subscriber line switch side terminal of the main wiring board;
A subscriber line switch (b) installed by a telecommunications carrier (B) other than the telecommunications carrier (A);
A remote multiplex subscriber line transmission device installed by a telecommunications carrier (B) in the telephone station;
A transmission path from the subscriber line switch (b) to the subscriber line switch side terminal of the main distribution board via the remote multiple subscriber line transmission device,
The connection to the terminal line side terminal connected to the subscriber line switch side terminal is changed from the connection to the subscriber line switch (a) owned by the telecommunications carrier (A) to the subscriber line switch ( A direct connection telecommunication system, characterized in that it is replaced by a connection to b). The terminal line side terminal of the main wiring board installed in the nearest telecommunications carrier (A) telephone station from the ISDN (BRI) terminal device of the telecommunications carrier (A) subscriber's home;
A metal line telephone line from the ISDN (BRI) terminal device to the terminal line side terminal;
A line terminating device constituting a part of the ISDN (BRI) terminal device installed in the subscriber premises;
A subscriber line switch side terminal of the main wiring board;
A subscriber line switch (b) installed by a telecommunications carrier (B) other than the telecommunications carrier (A);
A remote multiplex subscriber line transmission device installed by a telecommunications carrier (B) in the telephone station;
A transmission path to the subscriber line switch side terminal of the main distribution board via the remote multiple subscriber line transmission device;
A converter having a function of converting a signal sent by the ISDN ping-pong transmission method between the remote multiple subscriber line transmission device and the subscriber line switch side terminal into a signal of an echo canceller method;
The connection to the terminal line side terminal connected to the subscriber line switch side terminal is changed from the connection to the subscriber line switch (a) owned by the telecommunications carrier (A) to the subscriber line switch ( A direct connection telecommunication system, characterized in that it is replaced by a connection to b). The terminal line terminal of the main wiring board installed in the nearest telecommunications carrier (A) telephone station from the ISDN (PRI) phone at the subscriber's home of the telecommunications carrier (A),
A metal line telephone line from the ISDN (PRI) telephone to the terminal line side terminal;
An SHDSL compatible (system) modem installed in the subscriber premises;
A subscriber line switch side terminal of the main wiring board;
A subscriber line switch (b) installed by a telecommunications carrier (B) other than the telecommunications carrier (A);
A remote multiplex subscriber line transmission device installed by a telecommunications carrier (B) in the telephone station;
A transmission path to the subscriber line switch side terminal of the main distribution board via the remote multiple subscriber line transmission device,
The connection to the terminal line side terminal connected to the subscriber line switch side terminal is changed from the connection to the subscriber line switch (a) owned by the telecommunications carrier (A) to the subscriber line switch ( A direct connection telecommunication system, characterized in that it is replaced by a connection to b).   A direct connection comprising all three direct connection telecommunication systems, the direct connection telecommunication system of claim 1, the direct connection telecommunication system of claim 2, and the direct connection telecommunication system of claim 3. Telecommunications system The direct connection telecommunication system according to claim 1, the direct connection telecommunication system according to claim 2, and the direct connection telecommunication system according to claim 3. Direct connection telecommunication system

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