KR100194635B1 - Connection Structure for HDSL Transmission in ATM Switching System - Google Patents

Abstract

The present invention relates to a connection structure for HDSL transmission in an ATM switching system. The present invention relates to an HDSL transmission scheme that compresses a digital signal by multi-value modulation technology and reduces the effects of loss or crosstalk in a high-frequency region, which is a disadvantage of metallic cables. In order to efficiently transmit digital signal up to 2Mbps by using existing metallic cable as it is, it is connected to physical layer low speed subscriber matching means of ATM switch and it is long-distance by 4-wire two-way transmission to existing metallic cable. HDSL subscriber matching means for performing an effective function to realize high-speed data communication up to; HDSL subscriber control means for managing the maintenance functions of the plurality of HDSL subscriber matching means and reporting to higher call connection control processor means; The data and clock inputted from the HDSL subscriber matching unit are recovered to extract a frame, and the ATM cell is extracted and transferred to the ATM layer processing low speed subscriber matching unit. And physical layer slow subscriber matching means for configuring an ATM cell received by the ATM layer processing low speed subscriber matching means into an E1 frame and transmitting the same to the HDSL subscriber matching means. Adds a writing tag to the ATM cell received from the physical layer low-speed subscriber matching means, converts it into an internal cell, delivers it to the ATM switch means, and converts the internal cell received from the ATM switch means into an ATM cell, and delivers it to the physical layer slow subscriber matching means ATM layer processing persistent subscriber matching means; ATM layer processing Converts internal cells received from low-speed subscriber matching means to serial data and transmits them to ATM switch means through ATM switch links, and converts serial data received from ATM switch means through parallel ATM switch links into parallel data. ATM switch means for delivering to layer processing slow subscriber matching means; It performs various maintenance functions and connection management functions of the physical layer low-speed subscriber matching means with the signal cells input through the ATM switch means, and manages the maintenance functions of the HDSL subscriber matching means by the ESL-485 communication with the HDSL subscriber control means. It is equipped with call connection control processor means to provide broadband service to users who have difficulty in mineralization by using existing metallic cable and smoothly installs FTTH (Fiber To The Home) to install optical fiber to each home. It is expected to be a stepping stone to push forward, and it can be used as a network having a configuration that can flexibly respond while providing economically combining the current narrowband service and the future broadband service.

Description

Connection Structure for HDSL Transmission in ATM Switching System

The present invention relates to a connection structure for HDSL transmission in an asynchronous transmission mode (hereinafter referred to as ATM) switching system.

Recently, with the development of high speed and broadband technology, various broadband services such as high speed data transmission, video communication and multimedia communication are provided. In order to transmit such a large amount of information, a transmission line network using a broadband optical fiber is required in a metallic transmission line network mainly composed of copper wires. However, since communication networks have been established mainly as telephones, it is not economical to replace all of them with optical fibers to realize optical subscriber networks, and most users of telecommunications are narrowband services centered on telephones.

Therefore, there is a problem in that a network having a configuration capable of responding flexibly while providing economically combining the current narrowband service and the future broadband service is problematic.

The present invention devised to solve the above problems compresses the transmission band of digital signal by multi-value modulation technique, and applies HDSL transmission method to ATM switch which reduces the effect of loss or crosstalk in high frequency band which is disadvantage of metallic cable. By using the existing metallic cable as it is, the purpose is to efficiently transmit digital signals up to 2Mbps.

1 is an HDSL transmission device connection configuration in an ATM switching system.

2 is a connection diagram for an HDSL transmission service according to the present invention.

3 is a block diagram of an ATM subscriber registration device according to the present invention.

* Explanation of symbols for main parts of the drawings

11: HDSL subscriber premises device 12.13: HDSL transmitter

14,23a ~ 23k-1: physical layer low speed subscriber matching device

15,24: ATM layer processing low speed subscriber matching device

16,25: ATM switch device 21a ~ 21k-1: HDSL subscriber matching device

22: HDSL subscriber control device 26: call connection control processor

31: low speed subscriber matching unit 32: HDSL mapper / framer

33: Controller 34.36: HDSL Song Receiver

The present invention for achieving the above object is connected to the physical layer low-speed subscriber matching means of the ATM switch, HDSL subscriber matching means for performing an effective function to realize high-speed data communication over a long distance by four-wire bidirectional transmission to the existing metallic cable ; HDSL subscriber control means for managing the maintenance functions of the plurality of HDSL subscriber matching means and reporting to higher call connection control processor means; The data and clock inputted from the HDSL subscriber matching unit are recovered to extract a frame, and the ATM cell is extracted and transferred to the ATM layer processing low speed subscriber matching unit. And physical layer slow subscriber matching means for configuring an ATM cell received by the ATM layer processing low speed subscriber matching means into an E1 frame and transmitting the same to the HDSL subscriber matching means. Adds a writing tag to the ATM cell received from the physical layer slow subscriber matching means, converts it into an inner cell, delivers it to the ATM switch means, and converts the internal cell received from the ATM switch means into an ATM cell, and delivers it to the physical layer slow subscriber matching means. ATM layer processing low speed subscriber matching means; ATM layer processing Converts internal cells received from low-speed subscriber matching means to serial data and transmits them to ATM switch means through ATM switch links, and converts serial data received from ATM switch means through parallel ATM switch links into parallel data. ATM switch means for delivering to layer processing slow subscriber matching means; It performs various maintenance functions and connection management functions of the physical layer low-speed subscriber matching means with the signal cells input through the ATM switch means, and manages the maintenance functions of the HDSL subscriber matching means by the ESL-485 communication with the HDSL subscriber control means. And a call connection control processor means.

In the present invention, it is possible to temporarily provide broadband services for users who have difficulty in mineralization by using existing metallic cables, and is expected to be a platform for smoothly promoting FTTH (fiber to the home) for installing optical fibers to each home. It is becoming.

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

1 is a diagram illustrating the connection of HDSL transmission devices in an ATM switching system. The system can efficiently transmit various media such as documents, pictures, images, audio, and video through a communication line (telephone network) in the home, and receive multimedia services. HDSL subscriber premises device 11, HDSL transmission device 12, which is a subscriber side device, HDSL transmission device 13, which is an exchange side device, in order to perform HDSL transmission on an existing subscriber line in 4-wire according to the HDSL line configuration. A physical layer slow subscriber matching device (14) that inputs a cell of an exchange slow subscriber in an E1 frame and, on the contrary, identifies a boundary of an ATM cell using header error control, and processes a physical layer, an input cell. An ATM layer processing low-speed subscriber matching device 15 for processing the ATM layer by performing header conversion function, routing information addition function, and operation maintenance processing function of the And an ATM switch device 16 for performing internal cell / ATM cell interconversion and serial data / parallel data signal conversion.

The switch side HDSL transmission device 13 is connected to the physical layer low-speed subscriber matching device 14 having a line speed of 2.048 Mbps at the ATM switch to perform DS1E subscriber line matching to alternate the existing E1 frame to line 1 and line 2. To form a 4-wire HDSL frame. The transmission speed of the data that can be transmitted through this HDSL frame is 2.048Mbps, and it is transmitted to the subscriber side HDSL transmitter 12 without data loss by a distance of 3-4Km over a 0.5mm line.

The HDSL subscriber premises device 11 connected to the subscriber-side HDSL transmission device 12 may have various types of services such as interactive digital video, Internet access, LAN access, video conferencing, and distance education, depending on the type of service utilizing HDSL. Configure to provide services to subscribers.

In order to connect the HDSL transmission apparatus capable of providing such a service to the ATM exchanger, the DS1E frame signal input from the HDSL subscriber premises apparatus 11 is input using the physical layer slow subscriber matching apparatus 14 accommodated in the ATM exchanger. It receives and processes various maintenance signals included in the frame overhead, extracts an ATM cell, and delivers it to the ATM layer processing low-speed subscriber matching device 15. The ATM layer processing low-speed subscriber matching device 15 converts the ATM cell received from the physical layer low-speed subscriber matching device 14 into an internal cell assigned with a virtual path / virtual channel identification number and transmits the same to the ATM switch device 16. .

Since the reverse direction of the above process is also established, the internal cell received from the ATM switch device 6 is converted into an ATM cell, transferred to the physical layer slow subscriber matching device 14, and then transferred to the HDSL subscriber home via the HDSL transmission devices 12 and 13. The device 11 performs a service of 2.048Mbps transmission speed.

2 is a connection diagram for the HDSL transmission service according to the present invention, which is effective for realizing high-speed data communication over a long distance by four-wire two-way transmission to an existing metallic cable by connecting to a physical layer low-speed subscriber matching means of an ATM switch. HDSL subscriber control that manages and maintains maintenance functions of the HDSL subscriber matching devices 21a to 21k-1 and the plurality of HDSL subscriber matching devices 21a to 21k-1 that perform the functions and reports them to the upper call connection control processor 26. The device 22 recovers the data and the clock inputted from the HDSL subscriber matching devices 21a to 21k-1, extracts the frame, and extracts the ATM cell to transfer to the ATM layer processing low speed subscriber matching device 24.

And a physical layer low speed subscriber matching device 23a to 23k-1 configured to transmit the ATM cell received by the ATM layer processing low speed subscriber matching device 24 to the HDSL subscriber matching devices 21a to 21k-1 and configured as an E1 frame. A writing tag is added to the ATM cells received from the physical layer low-speed subscriber matching devices 23a to 23k-1, converted into internal cells, transferred to the ATM switch device 25, and the internal cells received from the ATM switch device 25 are transferred. The internal layer received from the ATM layer processing low-speed subscriber matching device 24 and ATM layer processing low-speed subscriber matching device 24, which is converted into an ATM cell and delivered to the physical layer low-speed subscriber matching devices 23a to 23k-1, is converted into serial data. ATM layer processing low-speed subscriber matching device by converting the serial data received from the ATM switch device 25 through the ATM switch link and converting the serial data received from the ATM switch device 25 into parallel data. 24 to perform various maintenance functions and connection management functions of the physical layer low-speed subscriber matching device 23a to 23k-1 with the signals inputted through the ATM switch device 25 to the cell. In addition, the HDSL subscriber control device 22 and the call connection control processor 26 for managing the maintenance function of the HDSL subscriber registration device (21a ~ 21k-1) by EIA-485 communication.

Here, since the switch link speed of the ATM switch can process a cell stream of 156 Mbps, a 2M low-speed subscriber (DS1E subscriber) can multiplex up to 75 subscriber links, but considering the hardware and system configuration, 64 subscribers Multiplex Therefore, the physical layer slow subscriber matching apparatuses 23a to 23k-1 are composed of 16 physical layer low speed subscriber matching apparatuses 23a to 23k-1 that accommodate 4 subscriber links.

In the physical layer low speed subscriber matching devices 23a to 23k-1, one pair of eight HDSL subscriber matching devices 21a to 21k-1 accommodating two HDSL subscribers is connected to four pairs. In other words, the physical connection of DS1E is a connection structure in which two HDSL subscriber matching devices are connected to one physical layer low-speed subscriber matching device to accommodate up to 64 HDSL subscriber matching devices in an ATM switching system.

The HDSL subscriber control device 22 monitors maintenance functions and information status with 32 HDSL subscriber matching devices 21a to 21k-1 through EIA-485 communication, and transmits all information to the upper call connection control processor 26. report.

3 is a block diagram of an HDSL transmission device according to the present invention, and a low speed subscriber matching unit performing an E1 framing and line matching function to match a low speed subscriber having a transmission rate of 2,048 Kbps (E1) supporting HDB3 line code. 31, 4 bytes of data are added to the standard E1 frame (32 bytes) of the PCM channel, which is connected to the low speed subscriber matching unit 31 and composed of serial data, converted into 36 bytes, and the transmission rate is 2304 Kbps. Is increased. HDSL mapper / framer 32, which is responsible for routing this PCM time slot to HDSL payload and multiplexing and demultiplexing of HDSL data streams, the low-speed subscriber matching section 31 and HDSL mapper / framer ( 32) to monitor and control the control signals and status registers of all channels to support and monitor the operation of the HDSL mapper / framer, and to support the EIA-485 communication port for the HDSL subscriber control unit 22 to perform maintenance functions. Perform the set function. And a controller 33 for controlling the HDSL transmitter / receiver 34 and 35 for 4-wire bidirectional transmission, and connected to the HDSL mapper / framer 32 and the controller 33 for digital analog conversion and 2B1Q digital. By performing analog transmission / reception, digitization of the received signal, and analog processing, the unbalanced transmission / reception signal is converted into a balanced line signal, and the HDSL transmission receivers 34 and 35 include 1/2 payload data and overhead ( 1168 Kbps) HDSL transmission receivers 34 and 35 capable of 4-wire bidirectional transmission.

As described above, the present invention connects a transmission scheme to a low-speed subscriber matching unit of an ATM switch and transmits a 2,048 Mbps transfer rate service to an existing metallic cable to a remote subscriber of 3 to 4 Km in four-wire bidirectional transmission to a conventional metallic cable. It is possible to provide broadband service to users who have difficulty in mineralization by using it, and it is expected to be a platform for smoothly promoting FTTH (Fiber To The Home) that installs fiber optic fiber to each home. There is an effect that can be used as a network having a configuration that can flexibly respond while providing economically combining services and future broadband services.

Claims (5)

HDSL subscriber matching means 21a, which is connected to an ATM switch and physical layer low-speed subscriber matching means 23a to 23k-1, and performs an effective function to realize high-speed data communication over a long distance by four-wire two-way transmission on an existing metallic cable. 21 k-1); HDSL subscriber control means 22 for managing the maintenance functions of the plurality of HDSL subscriber matching means 21a to 21k-1 and reporting them to the upper call connection control processor means 26; The data input from the HDSL subscriber matching means 21a to 21k-1 is recovered to a clock to extract a frame, the ATM cell is extracted and transferred to the ATM layer processing low speed subscriber matching means 24, and the ATM layer processing low speed subscriber matching. Physical layer low-speed subscriber matching means 23a to 23k-1 for constructing an ATM cell received by the means 24 into an E1 frame and transmitting the same to the HDSL subscriber matching means 21A to 21k-1; A writing tag is added to the ATM cells received from the physical layer low-speed subscriber matching means 23a to 23k-1, converted into internal cells, transferred to the ATM switch means 25, and the internal cells received from the ATM switch means 25 are transferred. ATM layer processing low-speed subscriber matching means 24, which are converted into ATM cells and transferred to physical layer low-speed subscriber matching means 23a to 23k-1; The internal cells received from the ATM layer processing low-speed subscriber matching means 24 are converted into serial data and transmitted to the ATM switch means 25 through the ATM switch link, and received from the ATM switch means 25 through the ATM switch link. An ATM switch means (25) for converting serial data into parallel data and transferring the same to the ATM layer processing low speed subscriber contention means (24); And perform various maintenance functions and connection management functions of the physical layer low-speed subscriber matching means 23a to 23k-1 with the signal cells input through the ATM switch means 25, and furthermore, the ATM subscriber control means 22 and the EIA. A connection structure for HDSL transmission in an ATM switching system, characterized in that it comprises call connection control processor means (26) for managing the maintenance function of the HDSL subscriber matching means (21a to 21k-1) by -485 communication. The ATM exchange as claimed in claim 1, wherein the physical layer slow subscriber matching means (23a to 23k-1) is composed of 16 physical layer low speed subscriber matching means (23a to 23k-1) accommodating four subscriber links. Connection structure for HDSL transmission in the system. 2. The physical layer slow subscriber matching means (23a to 23k-1) is composed of eight HDSL subscriber matching means (21a to 21k-1) for accommodating two HDSL subscribers. Connection structure for HDSL transmission in the ATM switching system, characterized in that connected. 2. The method of claim 1, wherein the HDSL subscriber control means 22 monitors the maintenance functions and information status by means of EIA-485 communication with 32 HDSL subscriber matching means 21a to 21k-1. A connection structure for HDSL in an ATM switching system characterized by reporting all information to (26). 2. The HDSL subscriber matching means 21a through 21k-1 provide an E1 framing and line matching function to match a low speed subscriber having a transmission rate of 2048 Kbps (E1) supporting HDB3 line code. A low speed subscriber matching unit 31 for performing; When the transmission speed is increased to 2304 Kbps by adding 4 bytes of data to the standard E1 frame (32 bytes) of the PCM channel composed of serial data connected to the low speed subscriber matching unit 31 and converting it to 36 bytes, the PCM An HDSL mapper / framer (32) responsible for routing time slots to HDSL payloads and for multiplexing and demultiplexing HDSL data streams; The low speed subscriber matching unit 31 and the HDSL mapper / framer 32 are interconnected to manage control signals and status registers of all channels to monitor and control the operation of the HDSL mapper / framer, and the HDSL subscriber control device 22 is maintained. A controller 33 for supporting and resetting the EIA-485 communication port to perform a maintenance function, and for controlling the HDSL transceivers 34 and 35 for 4-wire bidirectional transmission; And connected to the HDSL mapper / framer 32 and the controller 33 to perform digital analog conversion, 2B1Q digital / analog transmission / reception, digitization of a received signal, and analog processing to convert an unbalanced transmission / reception signal into a balanced line signal. The transmission receivers 34 and 35 include HDSL transmission receivers 34 and 35 capable of four-wire bidirectional transmission of 1/2 payload data and data including overhead (1168 Kbps). Connection structure for HDSL transmission in ATM switching system.