KR0177231B1 - Information processing apparatus for aal-1 layer - Google Patents

Abstract

The present invention relates to an information processing apparatus for separately processing information of an AAL-1 layer. In the prior art, since the encoded audio / video data applied to the host CPU through the AAL layer processor has a large amount of data, loads of the AAL layer processor and the host CPU are increased. Accordingly, in the present invention, the information of the AAL-1 layer, that is, the encoded audio / video data having a large amount of data is extracted to the first-in, first-out part 24 without being provided to the host CPU 26 separately. Therefore, since the load of the host CPU 26 and the AAL layer processing unit 14 is reduced, there is an effect that the cell transmission amount can be further increased.

Description

Information processing device of A-1 layer

1 is a schematic diagram showing each function divided into seven hierarchical structures in a general packet communication network.

2 is a block diagram showing an embodiment of an A-1 layer information processing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: physical layer processing unit 12: register

14: AAL layer processing unit 16: AAL-1 header comparison unit

18: counter 20: multiplexer

22: first-in, first-out writing unit 24: first-in, first-out unit

26: host CPU 28: memory

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an information processing apparatus of an A-L-1 layer (hereinafter referred to as AAL (Asynchronous Transfer Mode) Adaption Layer (AAL) -1) layer in packet communication. An information processing apparatus.

Packet communication is a communication method for transmitting and exchanging digital data information in the form of a packet. Unlike a circuit-switched network, in a packet communication network, information does not have a continuous flow in bits but is connected in packets and is intermittently transmitted.

In this respect, when digital transmission and packet transmission are compared, digital transmission is represented as a regular and continuous flow of digital bits, whereas packet transmission is prepared for irregularly and intermittently flowing packets of digital bits.

In this case, it is not necessary to continuously occupy a specific panel for packet forwarding, and thus characteristic differences between the circuit switched network and the packet switched network appear.

Packet communication has also been introduced and developed for the communication of digital data connecting computers and computer terminal devices. Packet communication has a close relationship with data communication and computer communication, and in order to establish packet communication, methods such as transmission, exchange, and network operation must be well-organized for packet communication.

That is, methods related to packet structure, packet forwarding, network connection, transmission path, etc. should be clearly defined. As such, a communication protocol defined for packet communication is called a protocol.

In general, since packet communication is applied to a complex situation composed of numerous systems and networks, the communication process is very complicated.

Thus, if all of these communication processing functions are defined through one protocol, the protocol becomes extremely complicated. Instead, finely segmenting and layering the information transfer process will reduce the complexity and complexity of the development and realization of communications processing functions.

Proposed is a reference model for Open Systems Interconection (OSI). In the hierarchical structure of packet communication, each communication function may be divided into seven hierarchical structures in the general packet communication network as shown in FIG.

In the packet communication network, there are a packet-switched public data network (PSPDN), a local communication network, and a packet wireless communication network. First, a packet switched public data network is a combination of interconnected nodes, and packet transmission occurs at each node.

Next, the local communication network is a small communication network established for the local area, and in many cases, it has the characteristics of a wired data broadcasting network. That is, packets can be delivered directly to all receivers without going through intermediate nodes for exchange.

Regional networks are also used as small private networks for local areas. Representative examples are local area network (LAN) and metropolitan area network (MAN).

Among them, the local area network is a packet communication network that provides a transmission speed of 10Mbps or less in an area within a few km in diameter. MAN can be classified as a packet communication network that provides a transmission speed of 150Mbps or less in an area of 50km in diameter.

Here, the local communication network is characterized by transmission media, network topology, and medium access control (MAC) protocol.

On the other hand, it is a packet wireless communication network that has moved the local communication network wirelessly.

The information processing of the AAL-1 layer according to the prior art is as follows.

First, the physical layer processor receives 53 bytes of cells, removes 5 bytes of headers, and leaves 4 bytes of information.

Next, the register sequentially outputs the information of the physical layer processing unit while shifting the information.

In addition, the AAL layer processor receives the information from the register, removes the AAL header and leaves pure information. Subsequently, the AAL layer processing unit transmits pure information of the AAL-1 layer, that is, encoded audio / video data, to a host CPU (host central processing unit).

Accordingly, the host CPU performs a specific program to decode the encoded audio / video data in software and restore the original audio / video data.

However, in the related art, since the encoded audio / video data applied to the host CPU through the AAL layer processor has a large amount of data, the load of the AAL layer processor and the host CPU is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object thereof is to provide an AAL-1 layer information processing apparatus which extracts information of the AAL-1 layer and processes it separately.

In order to achieve the above object, the present invention provides a physical layer processing unit for receiving a cell, removing a header and leaving information, a register for sequentially outputting the information from the physical layer processing unit while shifting information, and receiving the information from the register. An AAL layer processing unit for removing headers and leaving pure information, a memory for storing pure information from the AAL layer processing unit, a host CPU for controlling the AAL layer processing unit for storing order information in the memory, and predetermined information An AAL-1 header comparator for comparing the information of the register with the information of the register and outputting a comparison signal when the information of the register is information of the AAL-1 layer, a counter for receiving and counting the comparison signal of the AAL-1 header comparator; A multiplexer for multiplexing the count signal of the counter and information of the register; First-in-first-out write unit that outputs a first-in-first-out (FIFO) write signal under control of a counter, and first-in-first-out information according to the AAL-1 layer of the register according to a write signal of the first-in-first-out write unit. Characterized in that it comprises a first-in, first-out part.

When described in detail by the accompanying drawings an embodiment of the present invention as follows.

2 is a block diagram showing an embodiment of an AAL-1 layer information processing apparatus according to the present invention. The physical layer processor (TDC 1500 chip) 10 receives a 53-byte cell to remove a 5-byte header. Leave 48 bytes of information.

Next, the register 12 sequentially outputs the information from the physical layer processing section 10 by shifting the predetermined control clock. That is, the register 12 sequentially outputs information while shifting once per control clock.

In addition, the AAL layer processor (TDC 1560 chip) 14 receives the information from the register 12, removes the AAL header and leaves pure information.

The host memory (DRAM) 28 stores pure information from the AAL layer processor 14. At this time, the host CPU 26 controls the AAL layer processing unit 14 to store pure information in the memory 28.

Subsequently, after the SOC signal (Start Of Cell) is generated, the AAL-1 header comparison unit 16 compares predetermined information with information of the register 12 after four control clocks, and the information in the register 12 is AAL-. In case of information of one layer, a comparison signal is output.

The counter 18 receives the comparison signal from the AAL-1 header comparator 16 and counts it. Next, the multiplexer 20 multiplexes the count signal of the counter 18 and the information of the register 12 and outputs them. The first-in, first-out write unit 22 also outputs a first-in, first-out write signal under the control of the counter 18.

Therefore, the first-in first-out section 24 first-in-first-out information according to the AAL-1 layer of the register 12 according to the write signal of the first-in first-out write section 22.

As described above, the present invention extracts the information of the AAL-1 layer, that is, the encoded audio / video data having a large amount of data to the first-in, first-out part 24 without providing the host CPU 26 separately. Serve Therefore, since the load of the host CPU 26 and the AAL layer processing unit 14 is reduced, there is an effect that the cell transmission amount can be further increased.

Claims (1)

A physical layer processing unit 10 for receiving a cell, removing a header, and leaving information; A register (12) for sequentially outputting the information from the physical layer processing section (10); An AAL layer processor (14) for receiving information from the register (12), removing the AAL header and leaving pure information; An AAL-1 header comparator 16 for comparing preset information with information in the register 12 and outputting a comparison signal when the information in the register 12 is information of the AAL-1 layer; A counter 18 that receives and compares the comparison signal of the AAL-1 header comparison unit 16; A multiplexer (20) for multiplexing the count signal of the counter (18) and the information of the register (12); A first-in, first-out write unit 22 for outputting a first-in, first-out write signal according to the control of the counter 18; And a first-in, first-out unit (24) for first-in, first-out of the information according to the AAL-1 layer of the register (12) according to the write signal of the first-in first-out write unit (22).