KR20020070614A - x-DIGITAL SUBSCRIBER LINE SERVICE APPARATUS - Google Patents

Abstract

PURPOSE: An xDSL(x-Digital Subscriber Line) service device having a concentration function is provided to eliminate a need for dividing an STM(Synchronous Transfer Mode)-1 frame into voice signal and data areas, so as to effectively use a transmission path even when a voice signal or data amount is reduced temporarily. And the device configures an additional concentration within a remote unit, so as to effectively increase the number of subscribers. CONSTITUTION: In a host(100), the first ATM(Asynchronous Transfer Mode) converter(103) converts time division modulated channel voice signals from a PSTN(Public Switched Telephone Network) exchange(101) into ATM cells, and converts voice ATM cells into time division modulated channel voice signals. And the first multiplexer/demultiplexer(104) converts the voice ATM cells of the first ATM converter(103) and data ATM cells of an ATM exchange(102) into STM-1 frame signals for outputting, inputs STM-1 frame signals, and provides the voice ATM cells within the frame signals to the first ATM converter(103) and the data ATM cells to the ATM exchange(102). In a remote unit(200), the second multiplexer/demultiplexer(201) divides the STM-1 frame signals into voice ATM cells and data ATM cells for outputting, and converts supplied voice ATM cells and data ATM cells into STM-1 frames. The second ATM converter(202) converts the voice ATM cells from the first multiplexer/demultiplexer(104) into time divided channel voice signals, for provision to a concentrator(203), and converts the supplied time divided channel voice signals into voice ATM cells, for provision to the second multiplexer/demultiplexer(201). And an xDSL interface(204) divides the time divided channel voice signals and the ATM cells for provision to corresponding subscribers, inputs ATM cells and voice signals from subscribers, supplies inputted ATM cells to the second multiplexer/demultiplexer(201), and time-divides the voice signals for conversion into voice signals with a predetermined channel to provide the converted voice signals to the second ATM converter(202) through the concentrator(203). And the host(100) and the remote unit(200) are connected through an optical fiber(300).

Description

Digital subscriber line service device with aggregation function {x-DIGITAL SUBSCRIBER LINE SERVICE APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic switchboard for receiving a digital subscriber line (xDSL), and more particularly, to an xDSL service apparatus having a aggregation function.

xDSL was proposed in 1989 to deliver video, video, high-density graphics and Mbps data information using the existing copper wire (telephone line). Whereas conventional modems use only the Plain Old Telephone Service (POTS) band up to 3.4KHz, xDSL uses a much wider frequency range (eg 1 MHz for ADSL), which allows transmission rates from several Mbps to tens of Mbps over copper. Can be provided.

On the other hand, one of the xDSL network formation method is a method for accommodating a plurality of subscribers in the network by configuring a communication line using an optical fiber, a detailed block diagram is shown in FIG. As shown, the existing device consists of a host 10 and a remote device 20 residing at a remote location. Public Switched Telephone Network (PSTN) switch 11 and ATM switch 12 in host 10 are connected to Fiber Looper Carrier (FLC) 13, PSTN switch 11 is connected to a public telephone network The exchange 12 is connected to the internet network.

In the above configuration, channel-specific voice information modulated in a time division manner from the PSTN switch 11 is provided to the FLC 13, and ATM cells from the ATM switch 12 are provided to the FLC 13. The FLC 13 collects these voice information and ATM cell information to form a Synchronous Transfer Mode-1 (STM-1) frame, and transmits the STM-1 frame signal to a remote device 20 existing at a remote location. to provide. Here, in order for the FLC 13 to configure the ATM cell and the voice signal for each channel in one STM-1 frame unit, as shown in FIG. 2, the ATM cell region 31 and the channel-specific channel in the STM-1 frame 30 are shown. The voice signal area 32 should be divided and an ATM cell and a voice signal should be inserted in the area. Here, it will be readily understood from the description below that the ATM cell region 31 and the channel-specific voice signal region 32 should be configured to have a fixed size.

The STM-1 frame signal at the FLC 13 is provided to the remote device 20 via the optical fiber 40, and the FLC 21 within the remote device 20 sends the STM-1 frame signal back to the ATM cell and channel. It is separated into a separate voice signal and provided to a DSLAM (Digital Suscriber Line Access Multiplexer) 22. The DSLAM 22 multiplexes the ATM cell separated by the FLC 21 and the voice signal for each channel for each subscriber, and has a splitter or the like therein to provide the subscriber with the voice signal and the downlink data signal for each channel.

In the above description, the voice and data from the telephone network and the ATM network are provided to the subscriber and vice versa, that is, the voice information and the ATM cell provided from the subscriber are demultiplexed by the DSLAM 22 and provided to the FLC 21. The FLC 21 signals these voice information (demultiplexed and time-divided by channel) and upstream data into STM-1 frames and provides them to the FLC 13 of the host 10. The FLC 13 separates the STM-1 signals into ATM cells and channel-specific voice signals, and provides channel-specific voice signals to the telephone network through the PSTN switch 11, and ATM cells are connected to the Internet through the ATM switch 12. Provided by net.

In the above-described conventional technology, the optical fiber 40 is used as the transmission path between the host 10 and the remote device 20, so that a plurality of subscribers can be connected to one host 10. Occurs.

First, in order to signal the ATM cell and the channel-specific voice signal by the FLC 13 in the host 10 to the STM-1 frame, the ATM cell area and the voice signal area are separated and configured in the STM-1 frame as described above. Their size must be fixed. In this case, when the area is divided and fixed in the STM-1 frame, for example, the voice signal from the PSTN exchange may be small, and thus the voice signal may be left in the voice signal area of the STM-1 frame. It causes a problem that the furnace is wasted.

In addition, the related art has a problem in that a remote concentrator does not have a separate concentrator for a telephone network. That is, the absence of a concentrator means that a subscriber should always provide a voice channel, which causes a waste of transmission paths.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an xDSL service apparatus having an aggregation function capable of transmitting voice and data more efficiently without wasting transmission lines.

In order to achieve the above object, the present invention provides a digital subscriber line (xDSL) service apparatus, a public switched telephone network (PSTN) switch connected to a telephone network, and an asynchronous transfer mode connected to an internet network. A first ATM converter for converting a time division modulated voice-to-channel voice signal from a PSTN switch into an ATM cell, converting a voice ATM cell into a time division modulated voice-to-channel voice signal, and providing the PSTN switch to the PSTN switch; Converts the voice ATM and the data ATM cell of the ATM switch into a STM (Synchronous Transfer Mode) -1 frame signal and outputs the STM-1 frame signal to convert the voice ATM cell in the frame signal into the first ATM; A host provided to a conversion section, the host including a first multiplexer / demultiplexer for providing a data ATM cell to the ATM switch; Connected to the host, the STM-1 frame signal from the host is divided into an ATM cell as a voice signal and the ATM cell as the data, and the STM-1 frame is applied to the voice ATM cell and the data ATM cell. Converts a voice ATM cell from the first multiplexer / demultiplexer and a time-divided channel-specific voice signal to a concentrator, and provides an applied time-divided channel-specific voice signal to a voice ATM cell A second ATM converter configured to provide the second multiplexer / demultiplexer to the second multiplexer / demultiplexer, a time-divided channel-specific voice signal from the concentrator, and an ATM cell from the second multiplexer / demultiplexer, and provide the same to the corresponding subscriber. Inputs an ATM cell and a voice signal, and inputs the input ATM cell to the second multiplexer / demultiplexer. Ball, and by the time-sharing the speech signal converted into a voice signal of a predetermined channel with a remote device having a digital subscriber line to provide matching to the second ATM conversion unit 2 via the concentrator.

1 is a block diagram of a conventional digital subscriber line service apparatus;

2 is a structural diagram of an STM-1 frame used in a conventional digital subscriber line service apparatus;

3 is a block diagram of a digital subscriber line service apparatus having an aggregation function according to the present invention;

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

100: host 101: PSTN exchange

102: ATM exchanger 103: ATM conversion unit

104: Multiplexer / Demultiplexer

200: remote device 201: multiplexer / demultiplexer

202: ATM conversion unit 203: concentrator

204: xDSL matching unit

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

3 is a block diagram of an xDSL service device having a condensation function according to the present invention, having a host 100 and a remote device 200 as shown, wherein the host 100 and the remote device 200 are optical fibers. 300 is connected.

The host 100 has a PSTN switch 101 and an ATM switch 102 as shown, which are connected to a general telephone network and the Internet, respectively. As illustrated, the ATM converter 103 is connected to the PSTN switch 101, and the ATM converter 103 converts the channel-specific voice signals provided from the PSTN switch 101 into ATM cells. At this time (Virtual Channel Identifier) VCI in the header of the ATM cell, and (Virtual Pa th Identifier) VPI must be set to alert the channel of the audio signal. The ATM cell from the ATM converter 103 is provided to the multiplexer / demultiplexer 104, and the multiplexer / demultiplexer 104 converts the voice signal ATM cell from the remote device 200 to the ATM converter 103 as described below. To provide. The ATM converting unit 103 inputs an ATM cell from the multiplexer / demultiplexer 104 and restores the time-divided channel-specific voice signal according to the VPI and VCI information in the ATM cell and provides the same to the PSTN switch 101.

The multiplexer / demultiplexer 104 inputs an ATM cell from the ATM converter 103 as described above, while inputting a data ATM cell provided from the ATM switch 102. The multiplexer / demultiplexer 104 converts the voice ATM cell of the ATM converter 103 and the data ATM cell of the ATM switcher 102 into an STM-1 frame and provides it to the optical fiber 300. In this case, since the multiplexer / demultiplexer 104 frames the ATM cells from the ATM converter 103 and the ATM switch 102 in the input order, the STM-1 frame is separately divided into the voice signal region and the ATM. There is no need to separate them into cell areas.

Meanwhile, the multiplexer / demultiplexer 104 inputs an STM-1 frame signal of the remote device 200 provided through the optical fiber 300, and converts the STM-1 frame signal into an ATM cell to convert the ATM into the ATM 103 and the ATM. To the exchange 102. Here, the VPI and VCI in the header of the ATM cell are configured to inform whether the ATM cell is to be provided to the ATM converter 103 (ie, is it a voice signal) or to the ATM switch 102, so that the multiplexer / demultiplexer 104 ) Can easily provide ATM cells to corresponding ATM converter 103 and ATM switch 102.

The remote device 200 connected to the host 100 via the optical fiber 300 includes a multiplexer / demultiplexer 201 as shown, and the multiplexer / demultiplexer 201 is provided through the optical fiber 300. The STM-1 frame signals are returned to the ATM cell, and the voice ATM cell, which is voice data, is provided to the ATM converter 202, and the data ATM cell of the ATM network is provided to the xDSL matcher 204.

The ATM converting unit 202 returns ATM cells from the multiplexer / demultiplexer 201, that is, ATM cells having a voice signal, to the condensing device 203 by returning them to the time division modulated channel-specific voice data, and from the concentrating device 203 The time-divided channel-specific voice data provided are ATM cellized and provided to the multiplexer / demultiplexer 201. Here, the ATM converter 202 must set the channel of the time division modulated voice signal using the VPI, VCI in the ATM cell provided from the multiplexer / demultiplexer 201, and the time division modulation provided from the concentrator 203. The VPI and VCI of the ATM cell should be determined corresponding to the channel of the voice signal for each channel.

In addition, the multiplexer / demultiplexer 201 is provided with time division modulated channel-specific voice data from the concentrator 203 and ATM cells from the xDSL matching unit 204, and these signals, i.e., channel-specific voice data and xDSL matching. The signal of the unit 204 is converted into an STM-1 frame signal and provided to the host 100.

The condenser 203 performs the condensing function in the same way as the condenser in the general PSTN exchanger. That is, since the subscribers do not always use the telephone, the concentrator 203 may determine the number of subscribers connected through the xDSL matching unit 204 and the number of acceptable time division modulated voice channels of the multiplexer / demultiplexer 201 and the number of subscribers connected through the xDSL matching unit 204, for example. The number of subscribers can be increased by installing n.

The xDSL matching unit 204 inputs voice data of the time division modulated voice channel from the concentrator 203 and ATM cells from the multiplexer / demultiplexer 201 and multiplexes for each subscriber, and includes a splitter therein. By providing the channel-specific voice signal and downlink data to the subscriber. In addition, the xDSL matching unit 204 separates the voice signal and upstream data provided from the subscriber to time-division modulated voice signal is provided to the concentrator device 203, the ATM cell as the uplink data is provided to the multiplexer / demultiplexer 201. do. In other words, the xDSL matching unit 204 performs the same function as the conventional DSLAM.

The operation of the present invention having the above-described configuration will be described below.

First, a process of transmitting voice signals and uplink data from subscribers to a telephone network and an ATM network will be described. The subscriber's voice signal and upstream ATM cell data are separated by the xDSL matching unit 204 into the voice signal and the upstream ATM cell data, and the voice signal is time-division modulated and provided to the concentrator 203 as a voice signal of a predetermined channel.

The voice signal of the subscriber provided through the concentrator 203 is converted into a voice ATM cell at the ATM converter 202 and provided to the multiplexer / demultiplexer 201, and the data ATM cell of the xDSL matching unit 204 is also a multiplexer / demultiplexer ( 201). The multiplexer / demultiplexer 201 collects data ATM cells of the voice ATM cell xDSL unit 204 of the ATM converter 202, converts the data ATM cells into an STM-1 frame signal, and provides the same to the host 100.

The multiplexer / demultiplexer 104 in the host 100 inputs the STM-1 frame signal provided from the remote device 200 to provide voice ATM cells to the ATM converter 103, and the data ATM cells to the ATM switch 102 To provide. The ATM converter 103 converts the voice ATM cells from the multiplexer / demultiplexer 104 into a time-divided channel-specific voice signal and provides the same to the PSTN switch 101.

Next, a process of providing each subscriber with voice signals of the telephone network and data of the Internet network provided through the PSTN switch 101 and the ATM switch 102 will be described below.

First, the time-division modulated channel-specific voice signal provided from the PSTN exchanger 101 is provided to the multiplexer / demultiplexer 104 after being converted into the voice ATM cell by the ATM converter 103, and the ATM cell of the ATM switch 102 is also multiplexed. / Demultiplexer 104 is provided. Multiplexer / demultiplexer 104 is a remote device (200 converts the data ATM cells in the voice ATM cell and the ATM switch (102) from the ATM conversion unit 103 into a single STM-1 frame signal, and through the optical fiber 300, To provide.

The multiplexer / demultiplexer 201 in the remote device 200 inputs an STM-1 frame signal from the host 100 to provide voice ATM cells to the ATM converter 202, and the ATM cells, which are downlink data, are xDSL matching units. Provided at 204. The ATM converter 202 converts the voice ATM cells from the multiplexer / demultiplexer 201 into a time-divided channel-specific voice signal and then provides the xDSL matching unit 204 through the concentrator 203. The xDSL matching unit 204 multiplexes the voice data of the time division modulated voice channel from the concentrator 203 and the data ATM cells from the multiplexer / demultiplexer 201 on a subscriber-by-channel basis and provides the subscriber with a channel-specific voice signal and the corresponding ATM cell. To provide.

As described above, in the apparatus of the present invention, the STM-1 frame signal is changed while the time division modulated voice signal for each channel is changed to an ATM cell during the time division modulated voice signal for each channel and the ATM cell. By converting to STM-1 frame, it is not necessary to divide the STM-1 frame into a voice signal and a data area (ATM cell area), so that the transmission path can be effectively used even when the amount of the voice signal or data is temporarily reduced.

In addition, the present invention has the effect that the number of subscribers can be efficiently increased by configuring a separate concentrator in the remote device.

Claims (3)

In the x-digital subscriber line (xDSL) service device, Public Switched Telephone Network (PSTN) switch connected to telephone network, Asynchronous Transfer Mode (ATM) exchange connected to internet network, ATM cellization of time division modulated channel-specific voice signals from PSTN exchange, and time division modulation channel of voice ATM cell Converts a first voice signal and provides the PSTN switch to the PSTN exchanger; a voice ATM and a data ATM cell of the ATM switch are converted into STM (Synchronous Transfer Mode) -1 frame signals and outputted; A host having a first multiplexer / demultiplexer for inputting an STM-1 frame signal to provide a voice ATM cell in a frame signal to the first ATM converter and to provide a data ATM cell to the ATM switch; Connected to the host, the STM-1 frame signal from the host is divided into an ATM cell as a voice signal and the ATM cell as the data, and the STM-1 frame is applied to the voice ATM cell and the data ATM cell. Converts the voice ATM cell from the first multiplexer / demultiplexer and the time-divided channel-specific voice signal to a concentrator, and provides an applied time-division channel-specific voice signal to the voice ATM cell. A second ATM converter configured to provide the second multiplexer / demultiplexer to the second multiplexer / demultiplexer, a time-divided channel-specific voice signal from the concentrator, and an ATM cell from the second multiplexer / demultiplexer, and provide the same to the corresponding subscriber. Inputting an ATM cell and a voice signal, and inputting the input ATM cell to the second multiplexer / demultiplexer And a remote device having a digital subscriber line matching unit for time-dividing the voice signal, converting the voice signal into a voice signal of a predetermined channel, and providing it to the second ATM conversion unit through the aggregation device. Device. The method of claim 1, And said host and remote device are connected via an optical fiber. The method according to claim 1 or 2, The first and second ATM converters configure an ATM cell such that the channel of the time division modulated voice signal is represented in a header, and sets a channel of the time division modulated voice signal using the header of the ATM cell. A digital subscriber line service device having an aggregation function.