KR20020070611A - ACCESS SWITCHING SUBSYSTEM FOR x-DIGITAL SUBSCRIBER LINE IN SWITCHING SYSTEM - Google Patents

Abstract

PURPOSE: An access switching subsystem for xDSL(x-Digital Subscriber Line) of a full electronic exchange is provided to easily accommodate xDSL subscribers, and to increase and decrease an xDSL subscriber interface block according to the number of xDSL subscribers. CONSTITUTION: An xDSL subscriber interface block(110) divides voice and xDSL data from subscribers, to convert the xDSL data into ATM(Asynchronous Transfer Mode) cells for provision to a network interface circuit(130) and provides divided voice signals to a concentrator(120). Also, the xDSL subscriber interface block(110) converts the ATM cells from the network interface circuit(130) into xDSL data for provision to a subscriber with the voice signals of the concentrator(120). The network interface circuit(130) converts the ATM cells of the xDSL subscriber interface block(110) into STM-1(synchronous Transfer Mode) frames for provision to an ATM exchange through an optical fiber(14), and converts the STM-1 frame signals from the ATM exchange into ATM signals for provision to the xDSL subscriber interface block. The concentrator(120) concentrates the voice signals in the xDSL subscriber interface block(110) for provision to a time switch(140), and provides the voice signals from the time switch(140) to the xDSL subscriber interface block. And the time switch(140) time-switches the voice signals from the concentrator for provision to a connection network control system of a full electronic exchange, and provides the voice signals from the connection network control system to the concentrator(120).

Description

ACCESS SWITCHING SUBSYSTEM FOR x-DIGITAL SUBSCRIBER LINE IN SWITCHING SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electronic switchgear for accepting x-Digital Subscriber Lines (xDSL), and more particularly to an electronic switchgear for accepting digital subscription lines in an xDSL subscriber-matched exchange subsystem.

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 methods of forming the xDSL network is a method of accommodating a plurality of subscribers in the network by configuring a communication line using optical fiber, for this purpose, conventionally FLC (Fiber Loop Carrier) and DSLAM (Digital Subscriber Line Access Multiplexer) Was constructed. The FLC consists of the central office terminal (COT) of the PSTN exchange and a number of remote devices, and the COT is connected to the PSTN exchange and the ATM exchange, and the synchronous transmission mode of the time-divided channel-specific voice signal of the PSTN exchange and the ATM cell of the ATM exchange. -1 (Synchronous Transfer Mode: STM-1) frame is provided to the corresponding remote device (Remote Terminer ), and the STM-1 frame signal provided from the remote device is divided into PSTN by time-divided channel-specific voice signal and ATM cell It has a configuration provided to the exchange and the ATM exchange. Here, the COT and the remote devices are connected in an annular or end-station, and an optical fiber is used as the connection medium.

DSLAM is connected to remote devices. DSLAM multiplexes ATM cell and channel-specific voice signals from remote devices by subscriber, and has a splitter inside to provide channel-specific voice signals and downlink data signals. Provide the remote device with the voice signal and the uplink data signal provided from the subscriber.

Meanwhile, as described above, in the xDSL technology, FLC and multiple DSLAMs must be configured separately from the PSTN and the ATM switch, and the FLC must be connected to the PSTN exchange for transmitting voice signals, and connected to the ATM switch for delivery of ATM cells. Should have a configuration In addition, the conventional xDSL technology has to configure a separate FLC and a plurality of DSL A M to mediate the subscriber, the PSTN exchange and the ATM exchange period, the configuration is complicated, and the cost of the configuration has been the cause of the increase.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to provide a digital line service subscriber matching exchange subsystem of an all-electronic exchange that can accommodate ATM-based subscribers.

In order to achieve the above object, the present invention provides an all-electronic switch that accommodates an x-Digital Subscriber Line (xDSL), which includes an xDSL subscriber interface block, a network matching circuit, an aggregation device, and a time switch. The subscriber interface block separates voice and xDSL data from a subscriber, converts the xDSL data into an ATM cell, provides it to the network matching circuit, provides the separated voice signal to the concentrator, and provides an ATM from the network matching circuit. Convert a cell into xDSL data and provide the subscriber with a voice signal of the concentrator; The network matching circuit converts an ATM cell of the xDSL subscriber interface block into a synchronous transfer mode-1 (STM-1) frame and provides it to the ATM switch over the optical fiber, and the STM-1 from the ATM switch. Converting a frame signal into an ATM signal and providing the xDSL subscriber interface block to an xDSL subscriber interface block, wherein the concentrator collects the voice signal of the xDSL subscriber interface block and provides the voice signal from the time switch to the xDSL subscriber station block. And provide a subscriber interface block, wherein the time switch is configured to time-switch voice signals from the concentrator to provide to the network control system of the all-electronic switchboard, and to provide the voice signals of the network control system to the concentrator. do.

1 is a schematic block diagram of an electronic switch having a digital line service subscriber matching exchange subsystem according to the present invention;

2 is a block diagram of a digital line service subscriber matching exchange subsystem of an electronic switching system according to the present invention;

Figure 3 is a block diagram illustrating another embodiment of a digital line service subscriber matching exchange subsystem of an electronic switching center according to the present invention.

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

1: Switch 2: ATM Switch

11: xDSL subscriber match exchange subsystem

12: network control subsystem

13: central control subsystem

110, 150, 160: xDSL subscriber interface block

111: splitter 112: converter

113: ATM processing unit 114: cell bus matching unit

120: concentrator 130: network matching circuit

140: time switch 151, 161, 170: conversion unit

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

1 is a schematic block diagram of a PSTN exchanger carrying out a method according to the invention, where 1 denotes a PSTN exchanger.

The PSTN switch 1 has an xDSL Access Switching Subsystem for xDSL 11, an Interconnection Network Subsystem 12 and a Central Control Subsystem 13. .

The xDSL matched exchange subsystem (11) is connected with xDSL subscribers and has a time switch inside to mediate telephone voice transmission between subscribers or between the subscriber and the network control subsystem (12) and between the subscriber and the ATM switch (2). Mediate the transmission of data information. The network control subsystem 12 functions to connect between the xDSL match exchange subsystem 11 and the central control subsystem 13, and has a space switch therein to provide the xDSL subscriber match exchange subsystem 11 It serves to switch the call from and provide it to the subscriber. The central control subsystem 13 means a functional block that performs overall management of the entire network management, system maintenance, and the like in the switch 1.

The xDSL subscriber interface exchange subsystem 11 has an xDSL subscriber interface block 110 as shown in FIG. 2, and the xDSL subscriber interface block 110 has a splitter 111 as shown. The xDSL data and the telephone voice signal provided from the subscriber are separated, and the separated telephone voice signal is provided to the concentrating device 120 of FIG. Since the xDSL data separated from the splitter 111 is an analog state, the converter 112 converts the xDSL data into digital and provides the same to the ATM processing unit 113. The ATM processing unit 113 receives the xDSL data from the converter 112 and configures the ATM cell. The ATM cell of the ATM processing unit 113 is provided to the cell bus 115 through the cell bus matching unit 114.

In the above description, only the process of providing the xDSL subscriber matching exchange sub-system 11 with voice information and xDSL data from the subscriber to the concentrator 120 and the cell bus 115 is understood that the reverse process is also performed. That is, the ATM processing unit 113 divides the ATM cells received through the cell bus matching unit 114 into, for example, bytes and provides them to the conversion device 112, and the conversion device 112 is provided from the ATM processing unit 113. The data is received and converted into an analog and provided to the splitter 111. The splitter 111 integrates the data from the conversion device 112 and the voice information from the concentrating device 120 and transmits it to the subscriber.

On the other hand, ATM cells from the xDSL subscriber match exchange subsystem 11 must be converted to STM-1 frame signals in order to be provided to the ATM exchanger 2 via the optical fiber 14. To this end, the xDSL subscriber match exchange subsystem 11 of the present invention includes a network matching circuit 130, and the network matching circuit 130 includes a conversion circuit 132 and matching units 131 and 133. Here, the matching unit 131 is for transmitting / receiving ATM cells by matching with the xDSL subscriber interface block 110, and the matching unit 133 is matched with the optical fiber 14 and is provided to / from / to the ATM switch. -1 transmits and receives a frame signal. The conversion circuit 132 in the network matching circuit 130 converts an ATM cell from the matching unit 131 into an STM-1 frame signal and then provides the matching unit 133 to the optical fiber 14 through the matching unit 133. And converts the STM-1 frame signal provided from 133 into an ATM cell and provides it to the xDSL subscriber match exchange subsystem 11 through the matching unit 131.

From the above-described configuration, voice signals from subscribers connected to the xDSL subscriber matching exchange subsystem 11 are provided to the time switch 140 through the concentrator 120 and switched in the time switch 140 to control the network. The xDSL data from the subscribers is provided to the subsystem 12 and is provided to the ATM switcher 2 in the form of an STM-1 frame via the xDSL subscriber interface block 110 and the network matching circuit 130.

Conversely, the voice signal from the network control system 12 is provided to the splitter 111 via the time switch 140 and the concentrator 120, and the STM-1 frame signal from the ATM switch 2 is network matched. The circuit 130 and the ATM processing unit 113 are provided to the splitter 111 in units of 1 byte, and the splitter 111 synthesizes these signals and provides them to the subscriber.

However, since the number of subscribers that the aforementioned xDSL subscriber interface block 110 can accommodate is limited, it is necessary to expand the number of xDSL subscriber interface blocks 110. 3 illustrates an embodiment when the xDSL subscriber interface block 110 is extended. In the embodiment of FIG. 3, two xDSL subscriber interface blocks 150 and 160 are configured in addition to the xDSL subscriber interface block 110, and it should be noted that the number of added xDSL subscriber interface blocks may be added or subtracted as needed.

The added xDSL subscriber interface blocks 150 and 160 perform the same operation as the xDSL subscriber interface block 110. That is, the voice signal and data are input from the subscriber, the voice signal is provided to the concentrator 120, and the data is converted into an ATM cell and output.

Here, the xDSL subscriber interface block 110 and the network matching circuit 130 may be configured in the same board B1, but the xDSL subscriber interface blocks 150 and 160 must be selectively configured in correspondence to the number of subscribers. It should consist of boards B2 and B3 different from (110). Since the xDSL subscriber interface block 110 and the xDSL subscriber interface blocks 150 and 160 are connected by the optical fibers 15 and 16, the boards B2 and B3 configure the converters 151 and 161 to form the xDSL subscriber interface blocks 150 and 160. Each ATM cell is converted into an STM-1 frame signal and provided to the board B1. In the board B1, an STM-1 frame signal provided from the converters 151 and 161 in the boards B2 and B3 is converted into an ATM cell. A separate converter 170 for converting and providing the network matching circuit 130 should be configured. That is, the conversion unit 170 converts the STM-1 frame signals from the conversion units 151 and 161 into an ATM cell and provides the same to the network matching circuit 130, and the network matching circuit 130 provides the xDSL subscriber interface block 110. And STM-1 frame signaling of the ATM cells from the converters 151 and 161 to the ATM switch 2 via the optical fiber 14.

In the above-described example, only the case where xDSL data from the subscriber is provided to the ATM switch 2 is described. However, after the telephone voice signal from the subscriber is separated from the splitter 111 in the xDSL subscriber interface blocks 110, 150 and 160, the aggregation apparatus ( It will have to be provided to the time switch 140 via 12).

On the other hand, each of the above components must perform the reverse function of the above-described function, that is, to provide the subscriber with the voice signal from the ATM cell and the network control system 12 from the ATM exchanger (2). To this end, the network matching circuit 130 receives the STM-1 frame signals provided from the ATM switch 2 and converts the STM-1 frame signals into ATM cells, and outputs the ATM cells corresponding to the xDSL subscriber interface block 110. 110, but the ATM cells corresponding to the xDSL subscriber interface blocks 150 and 160 should be provided to the conversion unit 170.

The converter 170 receives the ATM cell from the network matching circuit 130, converts the ATM cell into an STM-1 frame, and provides the converted cells to the corresponding converters 151 and 161, respectively. Is converted into an ATM cell and provided to the xDSL subscriber interface blocks 150 and 160.

The xDSL subscriber interface blocks 110, 150, 160 operate the same as the xDSL subscriber interface block 110 of FIG. 2, and the concentrator 120 receives the voice signals from the network control subsystem 12 to the corresponding xDSL subscriber interface block 110. 150, 160).

As described above, the present invention has the effect of easily accommodating xDSL subscribers by configuring the xDSL matched exchange subsystem in the electronic switchboard. In addition, the xDSL matched exchange sub-system of the present invention can increase or decrease the internal xDSL subscriber interface block according to the number of xDSL subscribers, thereby effectively adapting to the number of xDSL subscribers.

Claims (4)

An electronic switchboard that accepts a digital subscriber line (xDSL), xDSL subscriber interface block, network matching circuit, concentrator and time switch, The xDSL subscriber interface block separates voice and xDSL data from a subscriber, converts the xDSL data into an ATM cell, provides the network matching circuit, provides the separated voice signal to the concentrator, and provides the network matching circuit. Convert the ATM cell into xDSL data and provide the subscriber with the voice signal of the concentrator; The network matching circuit converts an ATM cell of the xDSL subscriber interface block into a synchronous transfer mode-1 (STM-1) frame and provides it to the ATM switch over the optical fiber, and the STM-1 from the ATM switch. Convert the frame signal into an ATM signal and provide it to an xDSL subscriber interface block; The concentrating device is configured to condense the voice signal of the xDSL subscriber interface block to the time switch and provide the voice signal from the time switch to the xDSL subscriber interface block; The time switch provides time-switched voice signals from the concentrator and provides them to the network control system of the electronic switchboard, and digital line service subscriber matching of the electronic switchboard is configured to provide the voice signals of the network control system to the concentrator. Exchange subsystem. The method of claim 1, The xDSL subscriber interface block, A splitter that separates voice and xDSL data from the subscriber and synthesizes the input voice and xDSL data and provides the synthesized voice and xDSL data to the subscriber; A converter for digitizing xDSL data from the splitter and converting the xDSL data in a digital state to an analog and providing the same to the splitter; An ATM processor for converting xDSL data of the changer into an ATM cell, inputting an ATM cell, converting the xDSL data into xDSL data, and providing the same to the converter; A matching unit for matching the ATM processing unit and a cell bus, And said cell bus is connected to said network matching circuit. The method according to claim 1 or 2, Forming a plurality of xDSL subscriber interface blocks; Any one of the xDSL subscriber interface blocks is connected with the network matching circuit, The remaining xDSL subscriber interface blocks, which are not connected to the network connection circuit, are connected to a first converter, and the first converter converts an ATM cell into the STM-1 frame signal and converts the STM-1 frame signal into the ATM cell. Configured to convert, The first converter is coupled to a second converter via an optical fiber, the second converter being configured to convert an ATM cell into the STM-1 frame signal and to convert the STM-1 frame signal into the ATM cell , And said second converting section is connected with said network matching circuit. The method of claim 3, wherein The xDSL subscriber interface block and the second converter connected to the network matching circuit and the network matching circuit are configured in one board, And each xDSL subscriber interface block not connected to the network matching circuit is configured in a single board, respectively, with the corresponding first conversion section.