KR20000015191A - Synchronous transport module interface apparatus for controlling bidirectional usage parameter in adsl digital subscriber line access multiplexer - Google Patents

Abstract

PURPOSE: A synchronous transport module interface apparatus is provided to perform a traffic transmitting control with respect to a downstream traffic transmitted to a user and an upstream traffic transmitted to ATM (Asynchronous Transfer Mode) exchanger. CONSTITUTION: The apparatus comprises a processor (100) which performs a usage parameter control (UPC) with respect to an upstream traffic transmitted from a DSLAM (digital subscriber line access multiplexer) and a downstream traffic transmitted from a ATM exchanger, a cell bus (200) which receives a ATM cell from a user and a ATM cell from a bidirectional UPC part and transmits to the DSLAM, a bidirectional UPC part (300) which performs the usage parameter control with respect to an upstream traffic from the cell bus and a downstream traffic from an UNI part, an UNI part (400) which receives a series data and coverts into a parallel data and extracts the ATM cell from the parallel data and monitors/controls a STM-1 interface (synchronous transport module level 1 interface) and converts the ATM cell from the bidirectional UPC part into a series data and then transmits to an optical transmitting-and-receiving part, an optical transmitting-and-receiving part (500) which converts an electric signal transmitted from the UNI part into an optical signal and transmits to the ATM exchanger and converts the optical signal from the ATM exchanger into an electric signal and transmits to the UNI part. Thereby, the traffics in the user and the ATM exchanger are effectively controlled.

Description

Bidirectional User Parameter Control Synchronous Transmission Module Interface Device of ADL Network Connection Device

The present invention relates to a Digital Subscriber Line Access Multiplexer (DSLAM) of an Asymmetric Digital Subscriber Line System (ADSL), and in particular, an UPSTREAM and an ATM switch from a user to an ATM switch. By enabling user parameter control on DOWNSTREAM from user to user, traffic from each user and traffic from ATM exchanger can be effectively controlled to improve the reliability of service. A bidirectional user parameter control synchronous transmission module interface device of an SL network access device.

In general, ADSL system is a system that provides both telephone service and video on demand (VOD) over existing telephone lines, 1.5 Mbps (or 6 Mbps) in the direction from the telephone company to the user, the user from the telephone company In the up direction, the transmission speed between the down and the up direction is realized asymmetrically with a transmission rate of 16Kbps.

FIG. 1 is a block diagram of a DSLAM and an STM-1 interface board of a general ADSL system.

The ATM switch 3 exchanges an ATM cell to a corresponding user to perform an Asynchronous Transfer Mode service. The DSLAM 1 connects the ATM network and the Public Switched Telephone Network (PSTN) to the ADSL system. Thus, the ATM cell transmitted from the ATM switch 3 is transmitted to the ADSL system, and the ATM cell from the ADSL system is transmitted to the ATM switch 3. A synchronous transport module level 1 interface (STM-1 interface) 2 matches an ATM switch 3 and a DSLAM 1.

Before providing a service, the ADSL system negotiates a service bandwidth and a quality of service (QOS) for each ADSL service. Here, service bandwidth and quality of service that are negotiated for each user are called user parameters.

Thus, in order to provide good quality service to all ADSL users, the ADSL system must check whether the ADSL service is provided while complying with the negotiated level of service bandwidth and quality of service for each user. The traffic control by the user parameter control is performed by the STM-1 interface unit 2. Thus, the traffic transmitted from each user is examined to determine whether the traffic is suitable for the service bandwidth and quality of service negotiated with the user, that is, the user parameter.

2 shows a block configuration of such a conventional synchronous transmission module interface unit.

As shown therein, the processor unit 10 controls user parameter control (UPC) to be performed on the upstream traffic from the DSLAM 1 and matches signals between the ATM switch 3 and the DSLAM 1. . The cell bus unit 20 generates routing information by converting cell destination information (VPI, VCI) in the ATM cell received from the DSLAM 1, and transmits the ATM cell by the generated routing information. The one-way UPC unit 30 performs User Parameter Control (UPC) on the ATM cell transmitted from the cell bus unit 20. The UNI unit 40 receives serial data from the optical transmitter / receiver unit 50, converts the serial data into parallel data, extracts an ATM cell from the parallel data, monitors and controls a synchronous transmission module frame (STM-1 frame), and The ATM cell transmitted from the one-way UPC unit 30 is converted into serial data and then transmitted to the optical transmitter / receiver unit 50. The optical transmitter / receiver 50 converts the electrical signal transmitted from the UNI unit 40 to the ATM switch 3 by photoelectric conversion, and converts the optical signal transmitted from the ATM switch 3 into photoelectric conversion. 40). The network synchronizer 60 receives a clock from the outside for synchronization of the ATM ADSL system and provides a synchronization clock to the STM-1 interface. The reset unit 11 resets the processor unit 10, the dynamic RAM 12 stores the processing result data of the processor unit 10, and the ROM 13 stores the processor unit. Store the program for the operation of (10). The flash memory 14 stores data with a high frequency used in the processor unit 10. The power supply unit 70 supplies power to the STM-1 interface.

The network synchronizer 60 receives the data streams E1 and STM-1 from the outside, and recovers the E1 receiving and clock restoring unit 62 and the E1 receiving and clock restoring unit 62 to separate the data and the clock. And a clock synchronizing section 61 which outputs the clock in synchronization with the system clock.

Referring to the operation of performing traffic control in the STM-1 interface unit, when the ATM cell is transmitted from the DSLAM (1), the cell bus unit 20 converts the cell destination information (VPI, VCI) of the ATM cell Routing information is generated, and the generated routing information is transmitted to the one-way UPC unit 30 so that the ATM cell is transmitted to the destination.

The one-way UPC unit 30 accesses the connection using the virtual path identifier (VPI) and the virtual channel identifier (VCI) of the transmitted ATM cell. Therefore, the user performs parameter control (UPS) by inspecting traffic transmitted from the corresponding user of each connection. So it checks whether the ATM cell is being sent from the user at the level specified in the user parameters negotiated before service (service bandwidth, quality of service, etc.). Thus, limited system resources are concentrated on a specific user so that an unfair situation in which a poor quality service is provided to other users does not occur.

However, such a conventional STM-1 interface device performs traffic control only for the upstream (UPSTREAM) transmitted from the user, received by the DSLAM, and then transmitted to the ATM switch, and for the DOWNSTREAM transmitted from the ATM switch to each user. There was a disadvantage that traffic control cannot be performed.

In addition, since it is not possible to control traffic only for upstream and traffic for downstream, it is difficult to ensure that the service is provided at a negotiated level for each user.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is the STM-1 interface board of the ADSL DSLAM system, the downlink traffic transmitted to the user and the uplink transmitted to the ATM switch. By allowing traffic transmission control to be appropriate for each user parameter for the traffic, it is possible to service while guaranteeing the bandwidth and quality of service of the pre-allocated user for the traffic transmitted from the downward to the upward and the downward to the downward. The present invention provides a bidirectional user parameter control synchronous transmission module interface device of an SDL network access device.

In order to achieve the above object, the bidirectional user parameter control STM-1 interface device of the ADSL network access device according to the present invention,

A processor controlling to perform user parameter control (UPC) on the upstream traffic from the DSLAM and the downstream traffic from the ATM switch;

A cell bus unit for receiving an ATM cell from the DSLAM, receiving an ATM cell from a bidirectional UPC unit, and transmitting the ATM cell to the DSLAM;

A bidirectional UPC unit for performing user parameter control on the uplink traffic transmitted from the cell bus unit and the downlink traffic transmitted from the UNI unit;

After receiving serial data from the optical transmitter and receiver, converting into parallel data, extracting ATM cells from the parallel data, monitoring and controlling STM-1 frames, converting ATM cells transmitted from the bidirectional UPC unit into serial data, and UNI unit for transmitting to the optical transmission and reception unit;

It is characterized in that it comprises an optical transmission and reception unit for converting the electric signal transmitted from the UNI unit to all-optical conversion to the ATM switch, and the photoelectric conversion of the optical signal transmitted from the ATM switch to the UNI unit.

1 is a block diagram of a general ADSL network access device and the STM-1 interface;

2 is a block diagram of a conventional STM-1 interface unit;

3 is a block diagram of a bidirectional UPC STM-1 interface unit of the ADSL network access apparatus according to the present invention.

<Explanation of symbols for main parts of the drawings>

1: DSLAM 100: processor unit

200: Selbus 300: Bidirectional UPC

310: downward UPC section 320: upward UPC section

400: UNI unit 500: Optical transmitting and receiving unit

60: Network donation

Hereinafter, a bidirectional user parameter control synchronous transmission module interface device of an SDL network access device of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a bidirectional user parameter control STM-1 interface device of an ADSL network access device according to the present invention.

As shown therein, the processor unit 100 controls the user parameter for the traffic from the DSLAM 1 and the user parameter for the traffic from the ATM switch 3. The cell bus unit 200 generates routing information by converting cell destination information (VPI, VCI) in the ATM cell received from the DSLAM 1, transmits the ATM cell by the generated routing information, and controls traffic. do. The ATM cell is received from the DSLAM 1 and transmitted to the bidirectional UPC unit 300, and the ATM cell is received from the bidirectional UPC unit 300 and transmitted to the DSLAM 1. The bidirectional UPC unit 300 performs user parameter control on the ATM cell transmitted from the cell bus unit 200 and the ATM cell transmitted from the UNI unit 400, respectively.

The UNI unit 400 receives serial data from the optical transmitter / receiver 500, converts the serial data into parallel data, extracts an ATM cell from the parallel data, monitors and controls an STM-1 frame, and the bidirectional UPC unit 400. After converting the ATM cell transmitted from the serial data to the serial data transmission unit 500. The optical transmitter / receiver 500 converts the electrical signals transmitted from the UNI unit 600 to all-optical signals and transmits them to the ATM switch 3, and photoelectrically converts the optical signals transmitted from the ATM switch 3 to the UNI unit ( 400). The network synchronizer 60 receives a clock from the outside for synchronization of the ATM ADSL system and provides a synchronization clock to the STM-1 interface. The reset unit 11 resets the processor unit 100, the dynamic RAM 12 stores the processing result data of the processor unit 100, and the ROM 13 stores the processor unit. Store a program for the operation of (100). The flash memory 14 stores data having a high frequency used by the processor unit 100. The power supply unit 70 supplies power to the STM-1 interface.

The bidirectional UPC unit 300 includes an uplink UPC unit 320 for performing user parameter control (UPC) by inspecting traffic for an ATM cell transmitted from each user transmitted by the cell bus unit 200, and the UNI. It consists of a downlink UPC unit 310 for inspecting the traffic for the ATM cell to each user transmitted from the unit 400 to perform user parameter control.

Referring to the operation of the bidirectional user parameter control STM-1 interface device of the ADSL network access device (DSLAM) according to the present invention as follows.

Since the operation of performing the user parameter control (usage parameter) for the UPSTREAM transmitted from the user to the ATM switch 3 is the same as the operation method of the conventional STM-1 interface device, a description thereof will be omitted.

An operation of performing user parameter control on the DOWNSTREAM transmitted from the ATM switch 3 to the user will be described.

When the optical signal of 155.520Mbps is received from the ATM exchanger, the optical transmitter / receiver 500 photoelectrically converts the optical signal into an electrical signal and then transmits the optical signal to the UNI unit 400. The optical transmitter / receiver 500 includes one transceiver module and includes a 1300 nm laser diode. The 155MHz clock is recovered from the received data, and if there is no received data, it performs a signal detection function to monitor and notify the outside.

When an electrical signal is input from the optical transmitter / receiver 500 to the UNI unit 400, the UNI unit 400 performs an ATM physical layer function to receive electrical serial data. After converting the received serial data into parallel data, an ATM cell is extracted from the converted parallel data. It also monitors and controls the STM-1 frame.

When the extracted ATM cell is transmitted to the downlink UPC unit 310 of the bidirectional UPC unit 300, the downlink UPC unit 310 accesses the connection to the corresponding user by using the VPI and VCI of the ATM cell and inspects the traffic. do. Thus, the downlink UPC unit 310 controls to satisfy the negotiation level of each user for the traffic transmitted from the ATM switcher 3 to each user. Thus, each user is detected based on the service bandwidth and quality of service initially agreed upon, and the user who is receiving traffic from the ATM switch 3 in excess of the criteria.

The cell bus unit 200 receives an ATM cell from the bidirectional UPC unit 300, and in the header of the ATM cell, a virtual channel identifier (VCI) and a virtual path identifier, which are cell destination information, are transmitted. Convert routing path identifier (VPI) to generate routing information. Thus, this routing information routes ATM cells to each user.

The cell bus unit 200 inserts a dynamic generic flow control (GFC) field into an ATM cell to manage traffic and to control congestion.

In this way, the downlink UPC unit 310 controls traffic downstream from the ATM switch 3 to each user, thereby ensuring a negotiated level of downlink quality of service.

In addition, the uplink UPC unit 320 of the bidirectional UPC unit 300 performs traffic control on the upstream from the user to the ATM switch 3, thereby ensuring a negotiated level of uplink quality of service.

In this way, user parameter control is performed not only for the traffic from the user to the ATM switch but also for the traffic from the ATM switch to each user, thereby providing a service that satisfies the pre-negotiated level for all users, thereby improving the reliability of the service. .

As described above, the bidirectional user parameter control synchronous transmission module interface device of the DSL network access device according to the present invention, as well as the downlink traffic transmitted from the ATM switch to the user, is transmitted from the user to the ATM switch. By checking whether or not the user's traffic is suitable for the agreed service bandwidth and quality of service, and controlling the transmission in advance, it is possible to effectively control the traffic at the user and the traffic at the ATM exchange. .

In addition, the downlink traffic to the user as well as the uplink traffic transmitted from the user to the ATM switch are controlled to provide the service while guaranteeing the bandwidth and the quality of the pre-allocated user, thereby improving the reliability of the service. It has an effect.

Claims (2)

In the synchronous transmission module interface (STM-1 interface) device of the DSL network connection device (DSLAM), A processor for controlling user parameter control (UPC) on the uplink traffic transmitted in the DSLAM and the downlink traffic from the ATM switch; A cell bus unit for receiving an ATM cell from a user in the DSLAM, receiving an ATM cell from a bidirectional UPC unit, and transmitting the ATM cell to the DSLAM; A bidirectional UPC unit configured to control user parameters for the uplink traffic transmitted from the cell bus unit and the downlink traffic transmitted from the UNI unit; After receiving serial data from the optical transmitter and receiver, converting into parallel data, extracting ATM cells from the parallel data, monitoring and controlling STM-1 frames, converting ATM cells transmitted from the bidirectional UPC unit into serial data, and UNI unit for transmitting to the optical transmission and reception unit; The optical transmission and reception of the electrical signal transmitted from the UNI unit to the ATM switch, and the optical signal transmission unit for transmitting the optical signal transmitted from the ATM switch to the UNI unit, characterized in that it comprises a DL network connection Bidirectional user parameter control synchronous transmission module interface device of device (DSLAM). The method of claim 1, wherein the bidirectional UPC unit, After accessing each connection using the virtual path identifier (VPI) and the virtual channel identifier (VCI) of the ATM cell transmitted from the cell bus unit, the uplink traffic from each user is examined to control user parameters. After accessing each connection by using the uplink UPC unit and the virtual path identifier and the virtual channel identifier of the ATM cell transmitted from the UNI unit, the downlink traffic from the ATM switch to each user is examined to control user parameters. A bidirectional user parameter control (UPC) STM-1 interface device of a DSLAM, characterized in that the downlink UPC unit to perform.