KR100707085B1 - System and method for multi-subscriber line - Google Patents

Abstract

A subscriber line multiplexing system having a particular subscriber line multiplexed between a subscriber side device and an exchange side device, wherein the subscriber side device encodes and outputs voice signals respectively output from a plurality of telephones. And a plurality of voice coding and decoding units for decoding the coded voice signals respectively provided from the subscriber line and providing them to the plurality of telephones, and are coded and provided from the plurality of voice coding and decoding units. A plurality of modems for modulating each of the voice signals at respective frequencies and outputting the respective voice signals, respectively demodulating each of the modulated voice signals provided by the subscriber line and providing the plurality of voice coding and decoding units respectively; Each side is connected to the modem, and the other side is connected to the subscriber line in common. Is includes a plurality of filters that respectively pass signals corresponding to the modulation frequency for each of the modems.

Description

Subscriber line multiplexing system and multi-telephone service method using the system {SYSTEM AND METHOD FOR MULTI-SUBSCRIBER LINE}

1 is a block diagram showing an embodiment of a subscriber line multiplexing system according to the present invention;

2 is a block diagram showing an embodiment of the exchanger shown in FIG. 1;

3 is a block diagram showing an embodiment of a subscriber-side device shown in FIG. 1;

4 is a block diagram showing an embodiment of the exchange side device shown in FIG. 1;

5 is a flowchart illustrating an embodiment of a multi-telephone service method using a subscriber line multiplexing system according to the present invention;

6 is a flowchart illustrating another embodiment of a multi-telephone service method using a subscriber line multiplexing system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: home 12, 14, 16: telephone

18 subscriber device 20 telephone station

22: exchange side device 24: exchanger

26: subscriber line

30, 32, 34, 62, 64, 66: speech coding and decoding section

36, 38, 40, 56, 58, 60: 3 modems 42, 44, 46, 50, 52, 54: filter

70, 72, 74: subscriber matching unit 76: number translation unit

78: control unit 80: switch

82: announcement broadcaster

The present invention relates to a subscriber line multiplexing system and a multi-telephone service method using the system, and more particularly, to a system for multiplexing a public switched telephone network (PSTN) subscriber line using a modem (MODEM) and a system thereof. A method for providing a PSTN multi-telephone service.

PSTN means a set of voice-based public telephone networks that are connected worldwide and include both commercial and state-owned networks. PSTN is a collection of circuit-switched telephone networks that have evolved since the days of the inventor of the telephone, Alexander Graham Bell. Today's PSTNs are technically almost completely digital, with the exception of the end link portion from the telephone company to the user.

PSTN actually provides the majority of long distance infrastructure in relation to the Internet. Internet service providers, called Internet Service Providers (ISPs), pay long distance carriers, lease high-speed leased lines, and use packet-switched schemes to allow many users to share the circuit. Therefore, each Internet user does not have to pay long distance charges such as long distance or international even when accessing a remote server, and many ISPs operate the service with only monthly access fee.

In a typical PSTN, an exchange installed at a telephone station allocates one subscriber line for each telephone number for a particular subscriber. That is, since the number of phone numbers and the number of subscriber lines are configured one-to-one, in order to attract a large number of subscribers, the subscriber lines must be hypothesized accordingly. Therefore, when there are a lot of subscribers as of today, the management of many subscriber lines as well as the subscriber line provisions is burdensome.

Looking at the conventional technology related to the subscriber line as follows.

Republic of Korea Patent Application No. 1986-0011208 'multi-access network device' is to allow the transmission and reception using the idle line to enable the communication of multiple pairs at the same time to improve the overall performance of the network.

To accomplish this, the transmission and reception lines of the communication controller C / C are connected with two transmission lines and two reception lines, respectively, and are transmitted through the transmission line T2 and the reception line R2 when communicating with the left subscriber. When receiving and communicating with the right subscriber, transmit and receive through the transmission line T1 and the reception line R1.

However, this conventional technique has a drawback of increasing the line installation cost because wires for transmitting and receiving are respectively installed between subscribers in order to form a multi-access network.

The present invention has been made to solve the above-mentioned problems of the prior art, a system for multiplexing one PSTN subscriber line using a modem so that a plurality of subscribers can use each phone number, and the PSTN system using the system. Its purpose is to provide a method for providing a multi-telephone service.

The present invention for achieving the above object has the following features.

According to the present invention, there is provided a subscriber line multiplexing system having a particular subscriber line multiplexed between a subscriber side device and an exchange side device, wherein the subscriber side device encodes voice signals respectively output from a plurality of telephones provided. A plurality of voice coding and decoding units for respectively outputting and decoding each coded voice signal provided from the subscriber line and providing them to the plurality of telephones, and the plurality of voice coding and decoding units A plurality of modems for modulating and outputting each of the voice signals coded and provided to respective frequencies, and demodulating each of the modulated voice signals provided from the subscriber line and providing them to the plurality of voice coding and decoding units, respectively. Each one side is connected to each of the plurality of modems, the other side is the subscriber Are connected in common are applied to the furnace comprises a plurality of filters that respectively pass signals corresponding to the modulation frequency for each of the modems.

Each modulation and demodulation frequency used by the plurality of modems is set differently.

The plurality of voice coding and decoding units use a voice coder method.

The plurality of filters are band pass filters, and the frequency bands to pass are different.

According to another aspect of the present invention, there is provided a subscriber line multiplexing system having a particular subscriber line multiplexed between a subscriber side device and an exchange side device, wherein the exchange side device is configured to output a voice signal output from each subscriber line of an exchange provided. And a plurality of voice coding and decoding units for respectively coding and outputting each of the coded speech signals provided by the subscriber line and providing them to the respective subscriber lines, and from the plurality of voice coding and decoding units. A plurality of modems for modulating and outputting each of the coded speech signals at respective frequencies and demodulating each of the modulated speech signals provided from the subscriber line and providing them to the plurality of voice coding and decoding units, respectively; Each one side is connected to each of the plurality of modems, the other side is Are connected in common to a group subscriber line is applied to include a plurality of filters that respectively pass signals corresponding to the modulation frequency for each of the modems.

Each modulation and demodulation frequency used by the plurality of modems is set differently.

The plurality of speech coding and decoding units use a vocoder scheme.

The plurality of filters are band pass filters, and the frequency bands to pass are different.

According to still another aspect of the present invention, there is provided a multi-telephone service method in an exchange providing a switching service using a subscriber line multiplexing system that multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A first step of determining whether there is an idle line among subscriber lines corresponding to each sub phone number of the specific representative phone number when dialing a specific representative phone number; and if there is an idle line, sub-call selection to the specific caller. A second step of providing a guide broadcast for determining; a third step of determining whether the selected sub phone is in a call when the specific caller selects a specific sub phone; and a call to the specific caller when the selected sub phone is not in a call. To establish a call between the selected sub-phones A fourth step, said second step to the first step 41 is performed using a subscriber line multiplex system with a modem and vocoder scheme.

In the first step, if there is no idle line, the specific caller is provided with an announcement during a call.

In the third step, when the selected sub-phone is busy, the busy call announcement is provided to the specific caller.

The specific caller may be allowed to select the sub phone by number.

According to a fourth aspect of the present invention, there is provided a multi-telephone service method in an exchange providing a switching service using a subscriber line multiplexing system that multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A first step of providing a guide call to the specific caller so that the specific caller can select a place corresponding to each of the plurality of phone numbers as a number when dialing a specific representative phone number of the plurality of phone numbers; A second step of forming a call between the specific caller and the telephone of the selected place when the caller selects a number corresponding to the place where the call is desired, wherein the first step and the second step are modem and vocoder schemes. This is done using the included subscriber line multiplexing system.

The specific caller may select a place corresponding to each of the plurality of telephone numbers by number.

A place corresponding to a plurality of telephone numbers may be selected so that a specific caller may select *, #, or a combination of numbers, a combination of * and #, etc. in addition to the numbers, which may be applied to other embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing an embodiment of a subscriber line multiplexing system according to the present invention, in which a home 10 and a telephone station 20 are connected by a subscriber line 26. The premises 10 have a plurality of telephones 12, 14, 16 and subscriber side devices 18, and the telephone station 20 has an exchange side device 22 and an exchange 24. The third telephone 16 is a cordless telephone and is composed of a fixing device and a portable device.

In the same figure, the subscriber-side device 18 of the premises 10 multiplexes a plurality of telephones 12, 14, 16 on one subscriber line 26, which will be described in detail with reference to FIG. Shall be.

The switch side device 22 of the telephone station 20 multiplexes a plurality of subscriber lines to one subscriber line 26, which will be described in detail with reference to FIG.

In addition, the exchanger 24 is generally used, referring to FIG. 2 as follows.

FIG. 2 is a block diagram illustrating an exemplary embodiment of the switch 24 shown in FIG. 1, and includes a plurality of subscriber matching units 70, 72, and 74, a number translation unit 76, a control unit 78, and a switch 80. , And the announcement broadcaster 82.

In the figure, a plurality of subscriber matching units 70, 72, and 74 each match a plurality of subscribers through respective subscriber lines. That is, one subscriber matching unit accommodates multiple subscribers over multiple subscriber lines. For example, the TDX-10 exchange accommodates 100,000 subscribers and the TDX-100 exchange accommodates 200,000 subscribers.

The number translation unit 76 receives the calling party number of a particular subscriber through the plurality of subscriber matching units 70, 72, and 74, and translates the calling party number to the control unit 78.

The control unit 78 controls the exchange function of the switch 80 based on the number translation information transmitted from the number translation unit 76 to form a call path between the caller and the called party. In addition, the controller 78 controls the guide broadcast of the specific content of the guide broadcaster 82 in some cases so that the guide broadcast is provided to the specific subscriber through the switch 80.

In the above-described TDX-10 exchanger and TDX-100 exchanger, the switch 80 is connected to a plurality of time division switch modules, each connected to a plurality of subscriber boards, and is connected to the plurality of time division switch modules, respectively, to exchange between a plurality of time division switches. It consists of an optical switch module. Therefore, it is possible to quickly exchange between each subscriber connected to a plurality of time division switch module.

The announcement service function of the switch 24 will be described with reference to FIG. 5 to be described later.

FIG. 3 is a block diagram showing an embodiment of the subscriber-side device 18 shown in FIG. 1, including a plurality of voice coding and decoding units 30, 32, 34, a plurality of modems 36, 38, 40, and It consists of a number of filters 42, 44, 46.

In the figure, the plurality of voice coding and decoding units 30, 32, and 34 in the subscriber-side device 18 code each of the voice signals output from the plurality of telephones 12, 14, and 16, respectively. Are respectively provided to the modems 36, 38, and 40, and each of the coded voice signals provided by the modems 36, 38, and 40 is decoded, respectively, and provided to the plurality of phones 12, 14, and 16, respectively. . In this way, the plurality of telephones 12, 14, and 16 are all busy in order for each device in the subscriber-side device 18 to operate. That is, when only the first telephone 12 is in a call, only the device related to the first telephone 12 is operated. Since the subscriber line 26 can be multiplexed by setting different modulation / demodulation frequencies used by multiple modems 36, 38, and 40 differently, each modulation / demodulation used by multiple modems 36, 38, and 40 is multiplexed. Set the frequency differently.

The plurality of voice coding and decoding units 30, 32, and 34 may be implemented by a vocoder method. Vocoders are modeled using the characteristics inherent in the voice signal to transmit various parameters of the model, and the receiving side reconstructs the voice signal using the received parameters. Vocoders operating at data rates of 4 to 10 Kbps have slightly lower sound quality than 16 to 64 Kbps waveform coding, but have better performance than waveform coding at bandwidths below 10 Kbps.

The above-described modem refers to a device that converts (modulates) an analog signal into a digital signal (demodulation) so that a digital signal from a computer can be transmitted through a telephone line.

The telephone lines or leased lines we use are voice-grade, so a lot of attenuation occurs when a digital signal passes through, so a modem is needed to transfer data between devices over 50 feet away. The modem can be largely divided into a transmitter and a receiver. The transmitter enters the modulator after the digital signal is input to the encoder and scrambled so that `1` or` 0` no longer comes out. Here, the carrier is modulated to a carrier frequency of about 1700-1800 Hz, transformed into an analog form, and then passed through a band-limited filter to the transmission line.

The receiving unit receives the frequency band of the desired part through the band limiting filter from the analog signal from the communication line, enters the automatic gain control (AGC), and divides it into an appropriate size. The analog signal is demodulated through a demodulator, converted into a digital signal, and then reduced back to the original data through a data decoder.

The plurality of modems 36, 38, and 40 modulate each of the voice signals coded and provided from the plurality of voice coding and decoding units 30, 32, and 34 to respective frequencies, thereby providing a plurality of filters 42, 44, and 46. Are respectively output to the plurality of filters 42, 44, and 46, and are respectively demodulated and provided to the plurality of speech coding and decoding units 30, 32, and 34, respectively.

The plurality of filters 42, 44, and 46 are each connected to a plurality of modems 36, 38, and 40, respectively, and the other side is commonly connected to the subscriber line 26 so that each modem 36, 38 is available. , 40) respectively pass the signal corresponding to the modulation frequency. That is, the plurality of filters 42, 44, 46 have different frequency bands to pass. For example, the first filter 42 passes only a frequency signal corresponding to the modulated demodulation frequency band of the first modem 36, and the second filter 44 corresponds to the modulated demodulation frequency band of the second modem 38. Only the frequency signal is passed, and the third filter 46 passes only the frequency signal corresponding to the demodulation frequency band of the third modem 40.

FIG. 4 is a block diagram showing an embodiment of the exchange side device 22 shown in FIG. 1, which includes a plurality of voice coding and decoding units 62, 64, 66, a plurality of modems 56, 58, 60, and It consists of a number of filters 50, 52, 54.

In the same figure, a plurality of voice coding and decoding units 62, 64, 66 in the switch side device 22 code a plurality of modems 56 by respectively coding the voice signals output from each subscriber line of the switch 24. , 58, 60, respectively, and decoded coded speech signals provided by the plurality of modems 56, 58, 60, respectively, and provided to each subscriber line of the switch 24, respectively.

The plurality of modems 56, 58, and 60 modulate each of the speech signals coded and provided from the speech coding and decoding units 62, 64, and 66 to respective frequencies, respectively, to the plurality of filters 50, 52, and 54, respectively. And demodulate each modulated speech signal provided by the plurality of filters 50, 52, and 54, respectively, and provide the demodulated speech signals to the plurality of speech coding and decoding units 62, 64, and 66, respectively.

The plurality of filters 50, 52, and 54 are each connected to each of the plurality of modems 56, 58, and 60, respectively, and the other side is commonly connected to the subscriber line 26 so that each modem 56, 58 may be connected. Pass through the signal corresponding to the modulation frequency in step 60). In other words, the plurality of filters 50, 52, 54 have different frequency bands to pass. For example, the eleventh filter 50 passes only a frequency signal corresponding to the modulated demodulation frequency band of the eleventh modem 56, and the twelfth filter 52 corresponds to the modulated demodulation frequency band of the twelfth modem 58. Only the frequency signal is passed, and the thirteenth filter 54 passes only a frequency signal corresponding to the demodulated frequency band of the thirteenth modem 60.

5 is a flow chart illustrating an embodiment of a multi-telephone service method using a subscriber line multiplexing system according to the present invention. The modem and vocoder scheme multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A multi-telephone service method will be described step by step in the exchanger 24 providing the switching service using the subscriber line multiplexing system included. At this time, since the subscriber line multiplexing system has been described in detail with reference to FIGS.

First, the exchange 24 in the telephone station 20 may be configured to call a specific representative telephone number when a specific caller connected through his subscriber board (not shown in the drawing) dials the specific representative telephone number using his telephone. It is determined whether there is an idle line among subscriber lines corresponding to each sub telephone number (steps S10, S12).

The switch 24 provides the announcement to the specific caller for sub-phone selection when there is an idle line (step S14). The switch 24 can appropriately set the contents of the announcement broadcast for selecting a sub telephone to a specific caller in accordance with the subscriber's request or the service of the telephone company. For example, 'My father's room is 1, my second daughter Young-hee's room is 2, my son Cheol's room is 3, and my information is changed to 9. The announcement can be made as shown in FIG.

The switch 24 provides a busy call announcement to a specific caller when there is no idle line in step S12, that is, when all subscriber lines corresponding to each sub phone number are busy (step S24).

The switch 24 determines whether the selected sub phone is busy when the specific caller selects the specific sub phone (steps S16 and S18).

The exchanger 24 forms a call between the specific caller and the selected subphone when the selected subphone is not busy so that the user of the specific caller and the selected subphone can talk (step S20).

If the sub phone selected in step S18 is busy, the exchange 24 provides a busy call announcement to a specific caller and returns to step S14 (step S22).

6 is a flow chart illustrating another embodiment of a multi-telephone service method using a subscriber line multiplexing system according to the present invention. The modem and vocoder scheme multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A multi-telephone service method will be described step by step in the exchanger 24 providing the switching service using the subscriber line multiplexing system included. At this time, since the subscriber line multiplexing system has been described in detail with reference to FIGS.

First, the switch 24 guides a specific caller so that a specific caller can select a place corresponding to the plurality of phone numbers as a number when a specific caller dials a specific representative phone number of the plurality of phone numbers, a so-called lifetime number. The broadcast is provided (steps S30 and S32).

A specific caller may select a place corresponding to each of the plurality of telephone numbers by using * or # or a combination of numbers, a combination of * and #, etc. in addition to the numbers, which may be applied to other embodiments of the present invention. .

The exchange 24 performs the formation of a call between the specific caller and the telephone of the selected place when the specific caller selects a number corresponding to the place where the call is desired.

Since one subscriber line 26 described above can be multiplexed into a line capable of accommodating a plurality of subscribers, a separate telephone number is assigned to each sub-phone without assigning a representative telephone number to the subscriber line 26. You may. In this case, the line multiplexing technique may use a time division scheme in addition to the modem scheme implemented in the present invention.

The technical spirit of the present invention has been described above with reference to the accompanying drawings. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

As described above, the present invention uses a modem to multiplex one PSTN subscriber line so that multiple subscribers can use each phone number. Therefore, not only the construction cost of the subscriber line is greatly reduced, but also the maintenance of the subscriber line is simplified.

Claims (19)

A subscriber line multiplexing system having a particular subscriber line multiplexed between a subscriber side device and an exchange side device, The subscriber-side device is configured to code and output voice signals respectively output from the plurality of telephones provided, and each coded voice signal provided from the subscriber line side is decoded respectively and provided to each of the plurality of telephones. Speech coding and decoding section of, Modulate each of the voice signals coded and provided by the plurality of voice coding and decoding units at respective frequencies, and output the modulated voice signals provided by the subscriber line. A number of modems, One side of each of the plurality of modems is connected to each side, and the other side is connected to the subscriber line in common, the subscriber line multiplexing system including a plurality of filters for passing each signal corresponding to the modulation frequency of each modem . The method of claim 1, Subscriber line multiplexing system, characterized in that each modulation and demodulation frequency used by the plurality of modems are set differently. The method of claim 1, And said plurality of speech coding and decoding units uses a vocoder scheme. The method of claim 1, And wherein the plurality of filters are band pass filters. The method of claim 4, wherein And the plurality of band pass filters have different frequency bands to pass. A subscriber line multiplexing system having a particular subscriber line multiplexed between a subscriber side device and an exchange side device, The switch side apparatus codes and outputs the speech signal respectively output from each subscriber line of the provided exchange, and decodes each coded speech signal provided from the subscriber line side to provide each to the subscriber line. A plurality of speech coding and decoding units, Modulate each of the voice signals coded and provided by the plurality of voice coding and decoding units at respective frequencies, and output the modulated voice signals provided by the subscriber line. A number of modems, One side of each of the plurality of modems is connected to each side, and the other side is connected to the subscriber line in common, the subscriber line multiplexing system including a plurality of filters for passing each signal corresponding to the modulation frequency of each modem . The method of claim 6, Subscriber line multiplexing system, characterized in that each modulation and demodulation frequency used by the plurality of modems are set differently. The method of claim 6, And said plurality of speech coding and decoding units uses a vocoder scheme. The method of claim 6, And wherein the plurality of filters are band pass filters. The method of claim 9, And the plurality of band pass filters have different frequency bands to pass. A multiple telephone service method in an exchange providing a switching service using a subscriber line multiplexing system that multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A first step of determining whether there is an idle line among subscriber lines corresponding to each sub telephone number of the specific representative telephone number when the specific caller dials the specific representative telephone number; A second step of providing an announcement for selecting a sub phone to the specific caller when there is an idle line; A third step of determining whether the selected sub phone is busy when the specific caller selects a specific sub phone; A fourth step of forming a call between the specific caller and the selected sub phone when the selected sub phone is not in a call; The first to fourth steps are performed using a subscriber line multiplexing system including a modem and a vocoder scheme. (delete) The method of claim 11, And the sub telephone selection is made by using a subscriber line multiplexing system including a modem and a vocoder scheme for the specific caller to select a number. The method of claim 11, And providing an announcement during a call to the specific caller when there is no idle line in the first step, using a subscriber line multiplexing system including a modem and a vocoder scheme. The method of claim 11, And in the third step, providing a guide announcement during a call to the specific caller when the selected sub-phone is in a call, using a subscriber line multiplexing system including a modem and a vocoder method. A multiple telephone service method in an exchange providing a switching service using a subscriber line multiplexing system that multiplexes each subscriber line corresponding to a plurality of telephone numbers to a specific subscriber line. A first step of providing an announcement to the specific caller so that the specific caller can select a place corresponding to each of the plurality of phone numbers when the specific caller dials the specific representative phone numbers of the plurality of phone numbers; And when the specific caller selects a place where the call is desired, forming a call between the specific caller and the telephone of the selected place. The first and second steps are performed using a subscriber line multiplexing system including a modem and a vocoder scheme. (delete) The method of claim 16, And a subscriber line multiplexing system including a modem and a vocoder scheme to select a place corresponding to each of the plurality of telephone numbers by the specific caller. The method of claim 16, A multiplexing system using a subscriber line multiplexing system including a modem and vocoder so that the specific caller selects a place corresponding to the plurality of telephone numbers by one of *, #, a combination of numbers, and a combination of * and #. Phone service method.

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