KR100233846B1 - Apparatus of transmitting data of broadcasting and atm - Google Patents

Abstract

The present invention relates to a broadcast and user information transmission device in an asynchronous transmission mode access apparatus for multiplexing asynchronous transmission mode data transmitted from an asynchronous transmission mode (ATM) network and digital broadcasting information provided from a digital headend to a subscriber. will be.

The access device provides asynchronous transmission mode information through the switching and forwarding function of the asynchronous transmission mode cells provided from the asynchronous transmission mode switching network to the subscriber through the service channel connection. What can be provided through the asynchronous transmission mode service connection in the access device is an on-demand video service connected to an asynchronous transmission mode switching network, an existing internet service, and a video telephone service. In addition, since the existing broadcasting channel is distributed and multiplexed, the existing asynchronous transmission mode data and the broadcasting data are fused to provide asynchronous transmission mode subscribers with both broadcasting and communication functions.

Description

Broadcast and asynchronous transmission mode data transmission device

The present invention provides an asynchronous transfer mode data provided from an asynchronous transfer mode network and a moving picture processing device (MPEG-2) provided from a digital headend; The present invention relates to a broadcast and asynchronous transmission mode data transmission device for simultaneously providing subscribers with 60 channels of digital cable broadcasting data of 6Mbps) through one asynchronous transmission mode channel.

Asynchronous transmission mode (hereinafter, referred to as ATM) access device may communicate with ATM switching network and subscriber network based on synchronous transmission method (STM-1; 155Mbps or STM-4c; 622Mbps). Through this access device, subscribers can be provided with high speed services such as high speed data service, video telephone, video on demand, search service and the like. In addition, the video processing device (MPEG-2) video developed through the development of multimedia signal processing technology provides better image quality than conventional analog TV in the 4 ~ 6Mbps band, thereby enabling digital multimedia information transmission. However, until now, communication networks and broadcasting networks have developed into separate networks, but in the ATM integrated access network, communication and broadcasting can be converged to provide a technology for transmitting to subscribers.

The ATM cells provided through the ATM network are 53 bytes, but in the broadcasting and ATM data transfer devices, a separate internal routing field is attached to the ATM cell header in front of the ATM cell header for switching processing inside the system. Allows automatic routing of. The moving picture processing device (hereinafter referred to as MPEG-2) information provided from the digital headend is composed of 188 bytes, and when it is mapped to the ATM Adaptation Layer 5 (AAL5) protocol and transmitted to the subscriber, An 8-byte AAL5 trailer is added to two consecutive MPEG-2 transport streams and configured as a 48-byte AAL5-PDU, and then an ATM header is added to the subscriber.

Broadcast information in the MPEG-2 transport stream format is distributed to subscribers as well as media data as well as information about program lists for subscribers to select channels. Since it serves to distribute to subscribers, it is possible to distribute an efficient broadcast service to many subscribers with limited bandwidth.

In the prior art, a broadcast service and a communication service are provided with separate networks. For example, cable TV networks and telephone and communication networks exist separately. Therefore, there is an advantage of providing various services by integrating broadcast data and communication data through a service access device to subscribers, and in the case of a broadcast, providing a subscriber through a selective channel processing device to maximize the service through efficient transmission bandwidth management. Can be.

However, the present invention provides a selective broadcast service by multiplexing an ATM service cell provided from an ATM network and a broadcast cell provided from an external broadcast headend in order to simultaneously provide subscribers with broadcast and communication services through an ATM subscriber access network device. An object of the present invention is to implement a broadcasting and communication information transmitting apparatus in an ATM environment for processing a service.

The present invention for achieving the above object is an ATM service channel access means for receiving an asynchronous transfer mode service cell provided from an ATM cell and a telephone network interface matching device connected to an ATM network and communicating with a switching processor, digital head-end Broadcast channel access means for receiving and distributing broadcast data from the network, switching processing means for switching user data provided from the service channel access unit and service data provided from the subscriber side, and multiplexing and separating broadcast data and ATM service cells Broadcast and service channel processing means for providing broadcast and service data to a subscriber, and control processing means for controlling and managing each processing unit of the apparatus through a processor.

1 is a block diagram of a broadcast and asynchronous transmission mode (ATM) data transfer apparatus according to the present invention.

FIG. 2 is a detailed configuration diagram of the broadcast and service channel processor of FIG. 1. FIG.

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

11: Asynchronous Transfer Mode (ATM) Service Channel Connection

12: telephone channel connection unit 13: switching processing unit

14: broadcast channel access unit 15: broadcast and service channel processing unit

16: control processing unit

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

1 is a block diagram of a broadcast and ATM data transmission apparatus for receiving ATM service data and broadcast data services of an ATM network according to the present invention. Reference numeral 11 denotes an ATM service channel access processing unit, 12 a telephone channel connection unit, 13 a switching processing unit, 14 a broadcasting channel connection unit, 15 a broadcasting and service channel processing unit, and 16 a control processing unit.

This device, which integrates and delivers ATM service and broadcast data to subscribers in an access network, receives a system clock and a reset signal to provide all signals for ATM service data and broadcast data to each processing block. First, the ATM service channel access unit 11 connected to the ATM network by STM-1 (155Mbps) or STM-4c (622Mbps) communicates with internal routing information in order to transmit ATM cells transmitted from the ATM network to corresponding subscribers. The internal routing tag corresponding to the ATM channel header is added to the switching processor 13 so as to be recognized, and the internal routing cell is received in reverse, and the internal routing tag is removed and then transmitted to the ATM network. .

The telephone channel access unit 12, which provides the existing telephone service to the subscriber, communicates with the telephone network by 2.048 (E1) line, and uses circuit mimic to transmit the E1 signal including 30 channels of 64Kbps telephone signal to the ATM network. After configuring the AAL1-PDU for each of several E1 channels, the ATM cell is converted into STM-1 (155 Mbps) to the ATM service channel access unit 11 to provide telephone data to the subscriber through a switching process. On the contrary, when transmitting to the telephone network, ATM cells provided from the subscriber side are provided from the ATM service channel access unit 11 and demultiplexed to separate the ATM header and the AAL1-PDU. It extracts timing information from AAL1 header and transmits E1 frame to telephone network through clock recovery for network synchronization with telephone network. The switching processing unit 13 including 16 input ports and 16 output ports is connected to the ATM network and the telephone network through the ATM service channel connection unit 11, and is connected to the subscriber side through the broadcasting and service channel processing unit 15. The internal routing cells provided from both interfaces do not switch by referring to the channel header of the existing ATM cell, but the routing information corresponding to the ATM channel header is added in the form of the ATM service channel access unit 11 and the broadcast and service channel. It functions to switch to each corresponding port by referring to internal routing cells provided from the processor 15. The broadcast channel connection unit 14, which is connected to an external digital headend and is connected to the STM-1, provides a broadcast distribution function. The MPEG transport stream, which is about 60 channels of broadcast data transmitted from the headend, is mapped to AAL5-PDU in two units. It is separated into eight ATM cells. Refer to Korean Patent Application No. 95-55917 for ATM cellization processing by mapping to AAL5-PDU for MPEG transport stream. The ATM cellized MPEG transport stream is configured in the same format as the internal routing cell and functions to copy and distribute to the corresponding broadcast and service channel processing unit 15. The broadcast and service channel processing unit 15 that can accommodate 16 input / output channels so as to correspond to the 16 input / output ports provided from the switching processing unit 13 respectively includes the broadcast data and the switching processing unit provided from the broadcast channel connection unit 14 ( 13) multiplex the internal routing cell, which is the ATM service data provided from 13), and separately transmit and transmit broadcast and service data to four optical termination devices that the broadcast and service channel processing unit 15 can provide. The reason why it can be separated and transmitted by four optical terminators is 622Mbps of switch link interface with the switching processor 13. After separating them into four 155Mbps, each 155Mbps ATM service data and 60 channels of broadcasting are provided. 360Mbps multiplexes the data and transmits it to the optical termination device connected by STM-4c (622Mbps), and transmits it to the subscriber through the optical termination device. On the contrary, since the amount of data transmitted from subscribers through the optical termination device is composed of a small amount of broadcast channel control information and a bidirectional service channel, the actual traffic of the uplink channel is composed of a link of STM-1 (155Mbps). 4 x 1 multiplexes 4 STM-1 (155 Mbps) signals provided from four optical termination devices connected to the service channel processor 15 and transmits the same to the switching processor 13. In this case, in the case of the broadcast channel control signal, a process of controlling the broadcast channel through filtering is performed. The control processing unit 16 including the processor and the peripheral logic provides a signal for control and management necessary for the corresponding block, and performs various processes required for system management.

2 is a detailed configuration diagram of a broadcasting and service channel processing unit according to the present invention, which includes an internal routing demultiplexer 21 and a broadcast channel access unit 21 for demultiplexing an internal routing cell provided from the switching processor 13 into 1 × 4. A broadcast data distribution unit 22 for separating the broadcast data provided from 14 into four optical termination devices 1 and 4, channel selection blocks 23 to 26 for processing channel selection signals requested from subscribers; 1 x 4 demultiplexed routing cells (1: 4), 2 x 1 multiplexing blocks (27 to 29, 210) for multiplexing broadcast cells, and a transmitter block (211) for transmitting the multiplexed broadcast and routing cells to the optical termination device 214 to 214), a receiver block 215 to 218 for receiving broadcast control and service routing cells provided through four optical termination devices from subscribers, and a 1 x 2 demultiplexer to separate broadcast control and service routing cells. Channel Selection Blocks and Internal Routing Multiplexing It consists of the broadcast control and service routing cell separation blocks (219 to 222), and the 4 x 1 multiplexer of the split service routing cell where routing multiplexer 223 for transmission to the switching processing unit 13 for separating a.

The internal routing demultiplexer 21 configured as a 1 x 4 demultiplexer uses the 622Mbps-class internal routing cells provided from the switching processor 13 as four optical terminators (1: 4) to perform internal routing cells in units of 155Mbps. Demultiplex The internal routing cell demultiplexing process analyzes a pre-allocated internal routing information field negotiated with the switching processor 13 to multiplex the broadcast cells 1 and 4 together, and to the optical termination device 1 through 4 through a transmitter block. Function to transmit. For example, the routing cell 1 in which the internal routing cell is separated from the switching processor 13 through the internal routing demultiplexer 21 is a broadcast cell distributed from the broadcast distributor 22. After being multiplexed in the 2x1 multiplex block 27 with the broadcast cell 1 provided downward through the transmission, it is transmitted to the transmitter 211. The transmitter 211 performing the ATM layer function and the physical layer function removes the internal routing information from the input routing cell 1 and the broadcasting cell 1 and then, through the physical layer function, processes the ATM channel header assigned to the subscriber. It transmits to the external optical terminator 1 through the physical layer link of 4c. The remaining routing cells (2: 4) and broadcast cells (2: 4) are also transmitted to the optical termination device (2: 4) through the same process.

Upon reception, the receiver 215, which performs the physical layer function and the ATM layer reception function through the STM-4c link connected to the optical termination device from the subscriber, determines the suitability of the received ATM cells to broadcast and control normal ATM cells. Transmit to cell separator 219. The broadcast control and service routing cell separation unit 219 separates the broadcast control cell and the service routing cell 1 according to a pre-assigned ATM numbering system, and in the case of a service cell, adds an internal routing field to the ATM service cell to provide an internal routing multiplexer ( 223), and in the case of a broadcast control cell, the channel selector 23 selects whether to transmit about 60 channels of broadcast cells and provides only necessary broadcast channels according to a subscriber's request. It provides a function to efficiently accommodate broadcast services. The remaining service routing cells and the broadcast control cells are also transmitted to the internal routing multiplexer 223 through the same process.

As described above, in the present invention, the subscribers can receive various services in a single line by integrating various services using an access device to services provided separately from the existing broadcasting network and the communication network. In consideration of the asymmetric data rate, subscribers can copy and transmit common data such as broadcasts downward, and transmit and control relatively few uplink data to the network side. have.

Claims (2)

After the device is initialized by the system clock and reset signal input from the outside, it receives the asynchronous transmission mode service cell from the asynchronous transmission mode network and switches through the related function processing of the internal routing information additional function for the interface with the switching function. An asynchronous transmission mode service channel interface for interfacing with a processing unit and performing a reverse function thereof; It is connected to the existing telephone network by the E1 line and processes the related functions such as using the asynchronous transmission mode adaptation layer 1 circuit mimicking to match the E1 frame to the asynchronous transmission mode network, and then converts the asynchronous transmission mode into a synchronous transmission mode. A telephone channel connection for providing a telephone service to a subscriber through communication with the asynchronous transmission mode service channel connection through one link, and performing a reverse function thereof; A switching processor for inputting and outputting internal routing cells associated with a corresponding network side or subscriber side through routing information recognized by a switching function with respect to internal routing cells provided from the asynchronous transmission mode service channel access unit and the broadcast and service channel processor; Receives the transport stream from the broadcast headend and uses the asynchronous transmission mode based on the asynchronous transmission mode adaptive layer 5 protocol, adds necessary information to recognize the corresponding output port, and then distributes it to the subscriber. With broadcast channel connection to say, 1 x 4 demultiplexing function for outputting to 4 ports with respect to the internal routing cell provided from the switching processing unit, and demultiplexed internal routing cell and broadcast cell by receiving broadcast data provided from the broadcast channel access unit. A broadcasting and service channel processing unit for distributing asynchronous transmission mode cells to optical termination devices which are subscriber side distribution devices through 2 x 1 multiplexing; And a control processor for controlling and managing each block of the broadcast and asynchronous transmission mode service data delivery device. The method of claim 1, wherein the broadcast and service channel processing means, After receiving the internal routing cell of 622Mbps from the switching processor and performing 1x4 demultiplexing by 155Mbps based on routing information, it is separated into routing cell 1, routing cell 2, routing cell 3, and routing cell 4, respectively. Internal routing demultiplexing means, After receiving broadcast data from the broadcast channel connection unit, broadcast data for distributing broadcast cell 1, broadcast cell 2, broadcast cell 3, and broadcast cell 4 to each channel selection block with the necessary information for distinguishing four output ports. Distribution processing means, A plurality of channel selection processing means for outputting only broadcast channel data according to a channel selection signal provided from the broadcast control and service routing cell separation block; A plurality of 2x1 multiplexing processing means for multiplexing the broadcasting cells provided from the channel selection block and the routing cells provided by the internal routing multiplexer; A plurality of transmission processing means for removing internal routing information for internal cells transmitted from the plurality of 2x1 multiplexing processing means, and then performing normalized asynchronous transmission mode cell transmission to optical termination devices serving as subscriber distribution devices; A plurality of receiving processing means for checking the asynchronous transmission mode cells received from the subscriber and the optical termination apparatus, adding internal routing information corresponding to the asynchronous transmission mode channel header, and transmitting the upper routing information; A plurality of broadcast control and service routing cell separation processing means for analyzing the internal routing cells transmitted from the plurality of reception processing means to separate the channel selection signal cell for broadcast channel control and the service routing cells to be transmitted to the network; And internal routing multiplexing processing means for multiplexing 4 x 1 multiplexing routing cells provided from the plurality of broadcast control and service routing cell separation blocks to a switching processor.

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