KR100692490B1 - Routing apparatus in digital subscriber line access multiplexor system - Google Patents

Abstract

A routing device of a DSLAM(Digital Subscriber Line Access Multiplexer) system is provided to expand the number of subscribers who can access an ATM(Asynchronous Transfer Mode) network by using an NIU(Network Interface Unit) only, without employing an SIU(Subtending Interface Unit). An ATM cell bus(330) is equipped. An optical transceiving module(312) consists of the first interface connected to an ATM network and the second interface connected to a subscriber expanding shelf. The first cell router(318) transmits an ATM cell sent to the subscriber expanding shelf from the ATM network, to the ATM cell bus(330) according to set routing information, receives an ATM cell to be transmitted to the ATM network from the shelf, in the ATM cell bus(330), and sends the received cell to the ATM network through the first interface according to the set routing information. The second cell router(320) receives an ATM cell to be transmitted to the shelf from the network, in the cell bus(330), sends the received cell to the shelf through the second interface according to set routing information, and sends the ATM cell to be transmitted to the network from the shelf, to the bus(330) according to the set routing information.

Description

Routing device of a DRAM system {ROUTING APPARATUS IN DIGITAL SUBSCRIBER LINE ACCESS MULTIPLEXOR SYSTEM}

1 is a diagram illustrating a conventional DRAM system.

2 illustrates a DRAM system according to a preferred embodiment of the present invention.

The present invention relates to a routing device of a Digital Subscriber Line Access Multiplexor (DSLAM) system.

In general, a digital subscriber line (DSL) is a transmission method for providing a bidirectional broadband high-speed data service to a home or business through a conventional copper telephone line (twisted wire pair drop cable) that has been installed.

These DSLs include asymmetric digital subscriber line (ADSL), high bit-rate digital subscriber line (HDSL), symmetric high speed digital subscriber line (SHDSL), and ultra high speed. And a Very High Data Speed Digital Subscriber Line (VDSL). These are collectively called xDSL.

Among these xDSL, ADSL is the most widely used method to provide high-speed data service to users of home and small business.

Therefore, the xDSL service will be described using an ADSL service system as an example.

In general, a system for ADSL service is located at an access node of an access network such as an ATM network and a public switched telephone network, and performs a DSLAM system performing a subscriber line aggregation function, and a network management device that manages a DSLAM system. System) ADSL transceiver that is located at the end of subscriber zone and performs data transmission / reception interface function between DSLAM system and subscriber, that is, ADSL Transmission Unit Receiver (ATU-R) and between DSLAM system and ATU-R And a splitter for filtering / integrating high frequency components for the data region and low frequency components for the voice region.

Therefore, the ADSL service system having such a configuration connects subscribers with Internet Service Provider service networks based on ATM networks, thereby providing subscribers with ADSL services such as Internet services and Plain Old Telephone Service. Will be provided together.

A DSLAM system among ADSL service systems having such a configuration will be described with reference to FIG. 1.

1 is a view showing an example of a conventional DSLAM system.

As shown in FIG. 1, the DSLAM system includes a converged shelf 100 and a modem shelf 200.

The aggregation self 100 includes a network interface unit (hereinafter referred to as "NIU") 110 and an extended self interface unit (hereinafter referred to as "SIU") 130.

The NIU 110 includes an optical transceiver module 112, a universal network interface (UN) module 114, a cell processor module 116, and a cell router 118.

The optical transmission / reception module 112 converts the STM-1 / 4 data transmitted through the optical cable from the ATM network into data of an electrical signal and provides it to the UNI module 114.

The UNI module 114 extracts an ATM cell from the data of the electrical signal provided by the optical transmission / reception module 112 and provides it to the cell processor module 116.

The cell processor module 116 demultiplexes the ATM cells provided by the UNI module 114 and provides them to the cell router 118.

The cell router 118 transmits the ATM cell to the cell bus 120 according to the routing information of the ATM cell provided from the cell processor module 116.

On the other hand, the NIU 110 receives the ATM cell to be transmitted from the SIU 130 to the ATM network from the cell bus 120 and reverses the above-described operation, thereby converting the ATM cell into data of STM-1 / 4 and thereby ATM. Send to the network.

Meanwhile, the SIU 130 is a unit to which a modem self 200 is connected to expand the number of subscribers connected to an ATM network through the NIU 110, and is a cell router 132, a cell processor module 134, and a UNI. Module 136 and optical transceiver module 138.

The cell router 132 receives the ATM cell transmitted from the NIU 110 from the cell bus 120 and provides it to the cell processor module 134.

The cell processor module 134 performs cell processing according to the routing information of the ATM cell provided from the cell router 132. Cell processing operations of the cell processor module 134 include multiplexing for ATM cell transmission, monitoring / error management of ATM cell transmission, and virtual path identifier (VPI) / virtual channel identifier (VCI) mapping.

The UNI module 136 transfers the cell-processed ATM cells to the STM-1 (Synchronous Transport Module-1) or DS-3 (Digital Signal Level-3) interface through the expansion shelf connection port of the optical transceiver module 125. Transmit to 200.

Meanwhile, the SIU 130 receives data transmitted from the subscriber transceiver 240 connected to the modem shelf 200 through the optical transceiver module 138 and performs the above operation in reverse to perform the subscriber transceiver 240. The data transmitted from the cell is transmitted to the cell bus 120.

The modem self 200 is a system for expanding the number of subscribers for connecting to an ATM network and includes an NIU 210 and an ADSL service unit 230.

The NIU 210 includes an optical transceiver module 212, a UNI module 214, a cell processor module 216, and a cell router 218.

The optical transmission / reception module 212 converts the STM-1 or DS-3 data transmitted from the SIU 130 into data of an electric signal and provides it to the UNI module 214.

The UNI module 214 extracts an ATM cell from the data of the electrical signal provided by the optical transmission / reception module 212 and provides it to the cell processor module 216.

The cell processor module 216 demultiplexes the ATM cells provided by the UNI module 214 and provides them to the cell router 218.

The cell router 218 transmits the ATM cell to the cell bus 220 according to the routing information of the ATM cell provided from the cell processor module 216.

On the other hand, the NIU 210 receives the ATM cell to be transmitted from the SIU 130 to the ATM network from the cell bus 120 and reverses the above operation to convert the ATM cell into STM-1 or DS-3 data. Transmit to SIU (130).

The ADSL service unit 230 modulates the ATM cell received from the cell bus 220 into an analog signal and transmits the same to the subscriber transceiver device 240.

On the other hand, the ADSL service unit 230 converts a signal received from the subscriber transceiver device 240 into an ATM cell and transmits the signal to the cell bus 220.

As described above, the SILA 130 is used in the DSLAM system to expand the number of subscribers to access the ATM network.

However, this caused a lot of cost problems in constructing the DSLAM system.

Accordingly, the present invention is to solve the above problems, to provide a routing device of the DSLAM system for expanding the number of subscribers without using the SIU for the number of subscribers to access the ATM network.

In order to achieve the above object, a routing device of a DSLAM system having a subscriber extension self connected to at least one subscriber transceiver according to an aspect of the present invention is a subscriber extension self from an ATM network through a first interface. The ATM cell transmitted to the subscriber extension self through the second interface according to the set routing information, and the ATM cell transmitted from the subscriber extension self through the second interface through the first interface according to the set routing information It includes a network interface for transmitting to the network.

The network interface unit may include an ATM cell bus; An interface unit having a first interface and a second interface; The ATM cell transmitted from the ATM network to the subscriber extension self via the first interface is transmitted to the ATM cell bus according to the set routing information, and the ATM cell to be transferred from the ATM cell bus to the ATM network from the subscriber extension self to the ATM network. A first cell router configured to transmit an ATM network through a first interface according to routing information received from the first interface; And receiving an ATM cell to be transmitted from the ATM network to the subscriber extension shelf from the ATM cell bus and transmitting the ATM cell to the subscriber extension shelf through the second interface according to the set routing information, and transmitting the ATM cell to be transmitted from the subscriber extension shelf to the network. And a second cell router for transmitting to the ATM cell bus according to the configured routing information.

Data transmission and reception between the first interface and the ATM network may be made of a STM-1 / 4 (Synchronous Transport Signal-1 / 4) interface.

Data transmission and reception between the second interface and the subscriber extension self may be performed by any one of a STM-1 (Synchronous Transport Signal-1) interface and a DS-3 (Digital Signal-Level3) interface.

Hereinafter, a DSLAM system according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

2 is a diagram showing the configuration of a DSLAM system according to a preferred embodiment of the present invention.

As shown in FIG. 2, the DSLAM system according to the present invention includes a concentrator shelf 300 and a modem shelf 400.

Aggregate shelf 300 includes NIU 310.

The NIU 310 includes an optical transceiver module 312, a UNI module 314, a cell processor module 316, and cell routers 318 and 320.

The optical transmission / reception module 312 converts the STM-1 / 4 data received from the ATM network into the STM-1 / 4 (Synchronous Transport Module-1 / 4) interface and converts the data into electrical data to provide the UNI module 314. .

The UNI module 314 extracts an ATM cell from the data of the electrical signal provided by the optical transmission / reception module 312 and provides it to the cell processor module 316.

The cell processor module 316 changes the VPI included in the ATM cell provided by the UNI module 314 according to the set routing information and provides it to the cell router 318.

Here, the final destination to which the ATM cell provided by the UNI module 314 will be transmitted is a terminal (not shown) connected to the ATU-R 382.

In addition, the routing information is reserved and used in the system the following VPI range for the VPC trunk. This routing information applies equally to devices performing routing of cells.

1 ~ 31: UBR traffic for each self (self_Id -1 + 1)

32 ~ 62: Traffic for CBR for each self (self_Id -1 + 32)

63 ~ 93: Traffic for RT-VBR for each self (self_Id -1 + 63)

94 ~ 124: Traffic for NRT-VBR for each self (self_Id -1 + 94)

Here, 1 to 124 represents a VPI range, and the self_Id may be configured as 1 for the aggregation self and 2 to 32 for the modem self.

Hereinafter, the VPC / VCC generation rule will be described.

The internal VPC generation rules are shown in Table 1 below.

   VPC Internal VPI Internal VCI Subtending VPI Subtending VCI X _c Index +32      0 X _c Index + 160       0

Internal VPI is a VPI for determining how many times SHELF is VPI, and XcIndex is a sequence number for establishing a connection.

Subtending VPI and Subtending VCI are VPI and VCI for looping a cell from cell router 318 to cell bus 330 to be received at cell router 320.

Next, the internal VPC generation rule will be described. The internal VPI / VCI value of VCC is set slightly differently depending on the connection.

First, the local connection in the aggregation self is shown in Table 2 below.

   VPC Internal VPI Internal VCI Spare VPI Spare VCI        0 X _c Index + 255        0       MAXVCC + 255 + 64 * slotNo + linkNo

And, in order to connect from the self-assembly to the external self is shown in Table 3 below.

   VPC Internal VPI Internal VCI Subtending VPI Subtending VCI        0 X _c Index + 255       Representative VPI X _c Index + 2047

Finally, the cell processor module connected to the UNI module uses the representative VPI as the internal VPI, and the other cell routers use '0' as the internal VPI.

 VCC Internal VPI Internal VCI  0 or representative VPI X _c Index + (255 or 2047)

The cell router 318 transmits the ATM cell provided from the cell processor module 316 to the cell bus 330 by performing a VPI / VCI mapping process according to the set routing information.

The cell router 320 performs the VPI / VCI mapping process according to the set routing information for the ATM cell transmitted from the cell bus 330 to the cell processor module 316.

The cell processor module 316 performs the VPI / VCI mapping process according to the configured routing information and provides the ATM cell provided from the cell router 320 to the UNI module 314.

The UNI module 314 transmits the ATM cell provided from the cell processor module 316 to the modem self 340 through the expansion port of the optical transceiver module 312 to the STM-1 or DS-3 interface.

On the other hand, the NIU 310 receives the ATM cell to be transmitted from the modem self 340 to the ATM network through the expansion port of the optical transmission / reception module 312 and performs the above-described operation in reverse, thereby performing the corresponding ATM cell STM-1 /. Convert the data to 4 and send it to the ATM network.

Modem self 340 is a system for expanding the number of subscribers for connecting to an ATM network and includes an NIU 350 and an ADSL service unit 380.

The NIU 350 includes an optical transceiver module 352, a UNI module 354, a cell processor module 356, and a cell router 358.

The optical transmission / reception module 352 converts the STM-1 or DS 3 data transmitted from the NIU 310 of the aggregation self 300 into data of an electrical signal and provides the converted data to the UNI module 354.

The UNI module 354 extracts an ATM cell from the data of the electrical signal provided by the optical transmission / reception module 352 and provides it to the cell processor module 356.

The cell processor module 356 performs a VPI / VCI mapping process on the ATM cell provided by the UNI module 354 according to the configured routing information and provides the cell router 358.

The cell router 358 transmits the ATM cell provided from the cell processor module 356 to the cell bus 342 by performing a VPI / VCI mapping process according to the set routing information.

On the other hand, the NIU 350 receives the ATM cell to be transmitted from the ADSL service unit 380 to the ATM network from the cell bus 342 and performs the above operation in reverse, thereby converting the ATM cell into STM-1 or DS-3 data. The conversion is transmitted to the NIU 310 in the aggregation shelf 300.

The ADSL service unit 380 modulates the ATM cell received from the cell bus 342 into an analog signal and transmits it to the ATU-R 382.

In contrast, the ADSL service unit 380 converts an analog signal received from the ATU-R 382 into an ATM cell and transmits the same to the cell bus 342.

As described above, according to the DRAM system according to the present invention, the number of subscribers for accessing the ATM network can be expanded using only the NIU without using the SIU.

Claims (4)

A routing device of a DSLAM system having a subscriber extension shelf connected to at least one subscriber station, ATM cell bus; An optical transmission / reception module having a first interface connected to an ATM network and a second interface connected to the subscriber extension self; ATM cells transmitted from the ATM network to the subscriber extension self via the first interface of the optical transceiver module to the ATM cell bus according to the set routing information, and ATM cells to be transmitted from the ATM cell bus to the ATM network from the subscriber extension self A first cell router configured to receive an ATM from the ATM cell bus and transmit the ATM network through the first interface of the optical transceiver module according to the routing information; And Receive the ATM cell to be transmitted from the ATM network to the subscriber extension shelf on the ATM cell bus and transmit it to the subscriber extension shelf through the second interface of the optical transmission / reception module according to the set routing information, and transmit from the subscriber extension shelf to the ATM network. Routing apparatus of a DRAM system including a second cell router for transmitting the ATM cell to be transmitted to the ATM cell bus according to the set routing information. delete The method of claim 1, Routing apparatus of the DRAM system of the data transmission and reception between the first interface and the ATM network is a STM-1 / 4 (Synchronous Transport Signal-1 / 4) interface. The method of claim 1, The data transmission and reception between the second interface and the subscriber extension self is a routing device of a DRAM system comprising any one of a STM-1 (Synchronous Transport Signal-1) interface and a DS-3 (Digital Signal-Level3) interface.

Images