KR100267380B1 - Atm base access device - Google Patents

Abstract

The present invention relates to an asynchronous transmission mode base (ATM based) access device comprising a broadband station apparatus and a subscriber access device, wherein the operating communication data such as operational control, performance and alarm monitoring control between the broadband station apparatus and the subscriber access apparatus are provided. As a technology for communication protocol processor for sending and receiving, it is possible to monitor the operation communication channel between broadband station device and subscriber access device in ATM base access device and to quickly maintain in case of failure and to ensure reliable transmission of data. In addition, since the routing structure for IPC data processing is simplified because the IPC cell is designed to handle the same as a general service cell, the routing circuit for IPC data processing can be simplified, and even when a plurality of subscriber access devices are connected to the broadband office device. IPC channel operation method can be applied in the same way, which is advantageous in terms of system scalability There is one advantage.

Description

Asynchronous transfer mode base access device

The present invention relates to an asynchronous transmission mode base (ATM based) access device comprising a broadband station apparatus and a subscriber access device, wherein the operating communication data such as operational control, performance and alarm monitoring control between the broadband station apparatus and the subscriber access apparatus are provided. It is a technology for operational communication protocol handler for exchanging data.

In general, as a method for exchanging operational communication data between systems in an ATM base access device, a null protocol without application protocol is applied to application data on an ATM connection in the form of a permanent virtual circuit (PVC). There are a variety of methods such as a method of delivering in a null protocol and a method of delivering application data using a point-to-point protocol.

In the former case, the development period is shortened and the implementation is easy, but the reliable transmission of data is not guaranteed, while the latter is not so disadvantageous in terms of development period or implementation aspects, and thus the protocol can be secured. These protocols are selected based on their strengths and weaknesses and the importance of the application system.

In particular, in a device in which one broadband bureau and a plurality of subscriber access devices are connected by high-speed optical, such as an ATM access device to which the present invention is applied, since a large number of subscriber service lines are connected to one subscriber access device, a real-time service failure occurs. Highly reliable communication channel operation between devices is required for reporting of alarms, eliminating the causes of failures, and maintaining the system uninterruptedly.

Thus, standard protocols are indispensable for reliable exchange of data between devices.

Existing ATM access devices transmit operational communication data using standard protocols that are as easy to use as null protocols or have already been verified, such as Transmission Control Protocol-Internet Protocol (hereinafter referred to as TCP / IP). Regardless of which protocol was used, there was no way to distinguish the cause of the failure, ie, which layer of the protocol stack for operational communication, so there was a problem in that it was difficult to maintain the system.

Disclosure of Invention It is an object of the present invention to provide a protocol processor for implementing an operational communication channel capable of transmitting reliable operational communication data and providing an uninterrupted service in view of the conventional problems and requirements as described above.

1 is a schematic configuration diagram of an ATM base access device to which the present invention is applied.

2 is a block diagram showing an operational communication protocol processor block embedded in an access device according to the present invention and a protocol stack according thereto.

3 is a detailed block diagram of an IPC cell processing unit of FIG. 2;

<Description of Symbols for Major Parts of Drawings>

1: General Phone 2: Private Line Subscriber

3: Set-Top Box 10: ATM based access device

11 broadband device 12 subscriber access device

13: IPC channel 110, 120: operational communication protocol processor

111, 122: IPC processing section 112, 121: OAM processing section

113, 123: optical transmission and reception unit 114: cell bus

115: protocol stack 111-1: IPC data processing unit

111-2: IPC cell processing unit 111-3: IPC cell generation unit

111-4: routing processing unit

In order to achieve the above object, asynchronous transmission including broadband subscriber station located at the national office and subscriber access device located at the subscriber side to provide voice level, leased line and broadband services to subscribers in the high demand area. A mode based access device, comprising:

An IPC processing unit that generates inter-processor communication (IPC) data when an operator command or report is automatically generated, and makes an ATM cell via a transmission control protocol-Internet protocol (TCP / IP) stack to transmit and reverse the function;

An operation / maintenance (OAM) processing unit for monitoring the failure of the IPC channel of the IPC processing unit and quickly identifying the cause of the failure in the event of failure;

It analyzes routing tag information of cells inputted from IPC processing unit through cellbus, receives IPC cells matching its own address, transmits them to the subscriber access device, and classifies cells through built-in routing table. An operational communication protocol processor including an optical transmitter and receiver is included in the broadband station apparatus;

An IPC processing unit that generates inter-processor communication (IPC) data when an operator command or report is automatically generated, and makes an ATM cell via a transmission control protocol-Internet protocol (TCP / IP) stack to transmit and reverse the function;

An operation / maintenance (OAM) processing unit for monitoring the failure of the IPC channel of the IPC processing unit and quickly identifying the cause of the failure in the event of failure;

Checking the virtual path identifier (VPI) value of the cell input through the cell bus from the broadband station device to classify the cells, and during transmission, the operation includes an optical transmitter / receiver that removes the routing tag information from the cell information and transmits the same. And a communication protocol processor included in the subscriber access device.

The above objects, features, and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, terms used in the present invention are defined prior to the description as follows.

Broadband station device is defined as a device installed in a company that receives voice level, leased line class, and broadband signals into ATM cells, adds routing information to each cell, and transmits optically to the subscriber access device and performs the reverse function. do.

The subscriber access device is defined as a device that receives a cell from the broadband office device and delivers it to the subscriber, and performs the reverse function.

Operational communication data is defined as overall data necessary for operating the system such as operational control, performance and alarm monitoring control between the broadband station equipment and subscriber access device, and the communication channel for operational communication data is defined as the operational communication channel. Interprocessor communication (hereinafter referred to as IPC) data and IPC channel are named respectively.

FIG. 1 is a diagram showing the basic configuration of a broadband station apparatus 11 and a subscriber access apparatus 12 in an ATM base access apparatus 10 to which the present invention is applied. It has a large number of subscriber access devices (12) located in a high-density demand area such as the voice level (1), leased line (2) and broadband service (3) to accommodate the broadband station device 11 and the subscriber access device ( 12) an access device 10 for optically transmitting the spaces.

The access device 10 performing the above functions includes: a broadband station apparatus 11 for integrating subscriber service in a telephone station and performing ATM function and reverse function;

A plurality of subscriber access devices (12) for receiving the ATM signal from the broadband station device (11) and performing a function and a reverse function for providing a service to each subscriber;

The plurality of subscriber access devices 12 are configured to include an IPC channel 13 connected to the central office management device 11 to provide centralized control.

Here, the IPC channel 13 exists as many as the number of subscriber access devices 12, each of the IPC channel 13 is operated on the PVC of a specific virtual path identifier / virtual line identifier (hereinafter referred to as VPI / VCI).

That is, the broadband station apparatus 11 and the subscriber access device 12 are connected point-to-point so that each subscriber access device 12 has an IPC channel 13 with the broadband station device 11, and between the two devices. Communication is possible with the VPI / VCI value of the pre-appointed cell header, and the receiving side recognizes the IPC channel 13 as the VPI / VCI information.

Eventually, IPC data is exchanged between two devices in the form of an ATM cell like a general user cell, so that the broadband office device 11 in the access device 10 can centrally manage a plurality of subscriber access devices 12, and can also control remotely. Done.

As mentioned above, a method of exchanging information by mapping IPC data to an ATM cell without a protocol is possible, but the TCP / IP protocol is used between two devices for the importance of IPC data and reliable transmission of data.

The present invention provides a protocol processor for maintaining reliable data exchange between devices and compatibility between devices using existing protocols that are easy to use and have proven functionality. Here, the device-to-device compatibility means that the system can be operated even when the manufacturer connects different subscriber access devices 12 to the broadband station device 11.

The protocol handler will be described in detail below.

2A shows a detailed block of the protocol processor 110, 120 embedded in the broadband station apparatus 11 and the subscriber access device 12 in the access device 10 according to the present invention. Since other configurations are well known, illustration and description are omitted.

FIG. 2B is a block diagram illustrating the inter-module operation and the used protocol stack 115 of the communication protocol processor for the IPC channel 13. Referring to the configuration of the protocol stack 115, IPC data and TCP / It consists of IP information, Ethernet address, asynchronous adaptation layer 5 (AAL5), and physical layer information.

In the above, IPC data is essential data for system operation such as alarm monitoring function, fault determination function, fault recovery function, testing, performance monitoring function and configuration state setting function.

IP and Ethernet addresses are unique values given to each subscriber access device 12.

Meanwhile, the operating communication protocol processor 110 embedded in the broadband station apparatus 11 generates IPC data through the TCP / IP stack 115 by generating an IPC data when a report is generated by an operator's command or automatically, and then makes an ATM cell. An IPC processing unit 111 for performing a function and a reverse function of adding a routing tag of several bytes to the 53-byte cell and transmitting the same to the cell bus 114;

Implemented in the same board as the IPC processing unit 111 to monitor the failure of the IPC channel, and to quickly determine the cause of failure in the failure, the protocol stack 115 to perform the operation of the ATM layer failure management / maintenance ( (Hereinafter referred to as OAM) processing unit 112;

Interpreting routing tag information from cells input through cellbus 114, accepting IPC cell that matches its address, removing routing tag, and mapping to synchronous signal payload to process pointer and overhead. It comprises a light transmitting and receiving unit 113 for performing a function and a reverse function for optical transmission to the subscriber access device 12 through the / O conversion.

In this case, the OAM processing unit 112 always activates a continuity check of ITU-T Recommendation I.610 to constantly monitor whether the IPC channel is operating normally. Monitor the IPC channel until the moment it is released.

In I.610, a negotiation procedure between pre-transmission and reception is required for continuity check, but for ease of implementation, the negotiation procedure is omitted and a continuity check cell is sent immediately.

In addition, the optical transmission and reception unit 113 for routing the IPC cell or OAM cell related to the IPC channel among the cells flowing from the subscriber access device 12 to the IPC processing unit 111 or OAM processing unit 112, routing therein The table exists.

That is, the routing table is read and the routing tag information recognizable by the IPC processing unit 111 and the OAM processing unit 112 is added to the 53-byte cell and sent to the cell bus 114.

Meanwhile, the operational communication protocol processor 120 embedded in the subscriber access device 12 generates IPC data through the TCP / IP stack 115 by generating an IPC data when a report is generated by an operator's command or automatically, and then makes an ATM cell. An IPC processing unit 121 that adds a routing tag of several bytes to the 53-byte cell and delivers the cell tag to the cell bus 114;

If there is no continuity check cell or user cell on the IPC channel, it is regarded as a fault on the IPC channel, and a virtual path-remote defect indication (VP-RDI) cell is sent to the sender, causing the sender to fail. OAM processing unit 121 to notify the operator to enable immediate action;

When receiving, it checks the VPI value of the receiving cell without a separate routing table, and if the cell is related to the IPC channel, only the routing information is added to the IPC processing unit 122 and the OAM processing unit 121 to be recognized and transmitted to the cell bus 114. At the time of transmission, the 53-byte cell from the IPC processing unit 122 and the OAM processing unit 121 maps the payload of the synchronous signal with the general service cell to perform optical transmission to the broadband station apparatus 11. It comprises a transmission and reception unit 123.

Here, the OAM processing unit 121 performs a function of generating a loopback cell according to an operator's command to find a fault layer in the stack 115 of FIG. 2 when the IPC channel is abnormal, and in the broadband station apparatus 11 The difference in function between the OAM processing unit 111 and the OAM processing unit 121 in the subscriber access unit 12 is that the OAM processing unit 121 of the subscriber access unit 12 omits routing tag information when OAM cells are generated and the cell bus 114 is omitted. The same is true except that

In addition, the optical transmission and reception unit 123 is connected to the IP address and Ethernet (Ethernet) address in the stack 115 of Figure 2 in order to maintain compatibility between one broadband station device 11 and the subscriber access device 12 Each subscriber access device 12 is pre-assigned with a unique value, and the IPC data type is managed in the same version in the access device 10 of the present invention as data of the C language structure.

The VPI value of the IPC channel related ATM cell header used in each part of FIG. 2A is filled with a predefined value in the access device 10 and is always the same value on each IPC channel and is the same up and down.

FIG. 3 is a block diagram showing the internal functions of the IPC processing units 111 and 122 configured in the broadband station apparatus 11 and the subscriber access apparatus 12. In the broadband station apparatus 11 and the subscriber access apparatus 12, FIG. It is treated in the same way.

Converts the operational communication data to be transmitted to the subscriber access device 12 (or the broadband station device 11) into an AAL5 type message via TCP / IP, and converts the message input from the IPC cell processing unit 111-2. An IPC data processor 111-1 for analyzing;

The AAL5 type ATM cell inputted from the subscriber access device 12 (or the broadband office device 11) performs a recombination function, and transmits the data converted into a message format to the IPC data processing unit 111-1. An IPC cell processing unit 111-2;

The AAL5 message received from the IPC data processor 111-1 is divided into a 53-byte ATM cell, and a routing tag is added to add a routing tag to be transmitted to the subscriber access device 12. An IPC cell generation unit 111-3 which transmits only 53 bytes of cells to the routing processing unit 111-4 without routing tag information when transmitting to the broadband station apparatus 11;

It is responsible for the cell bus interface function of the broadband station device 11 (or subscriber access device 12), and can be transmitted to the subscriber access device 12 (or broadband station device 11). And a routing processor 111-4 which performs a function of routing to 113 and 123 and a reverse function thereof.

Referring to the operation of the operational communication protocol processor (110, 120) configured as described above are as follows.

First, the case where data is transmitted from the broadband station apparatus 11 will be described.

When the operational communication data to be transmitted to the subscriber access device 12 is generated, the data is converted into an AAL5 type message via TCP / IP in the IPC processing unit 111 in the broadband station device 11, and again 53 bytes Create an ATM cell and add a routing tag.

The generated data is input to the optical transmitter / receiver 113, the routing tag is removed, and then transmitted to the subscriber access device 12 through the E / O conversion.

In this case, the OAM processing unit 112 monitors the IPC channel from the time point at which the subscriber access device 12 is connected to the moment the connection is released, and transmits a continuity check cell, thereby enabling the receiver to detect a failure.

When the data is input, the subscriber access device 12 checks the VPI value of the received cell. If the cell is related to the IPC channel, the subscriber access device 12 adds only routing information to be recognized by the IPC processing unit 122 and the OAM processing unit 121. To be entered.

On the other hand, the process of transmitting from the subscriber access device 12 to the broadband office device 11, the IPC processing unit 122 converts the message in the form of AAL5 type through TCP / IP, and again the ATM of 53 bytes The cell is generated and transmitted to the optical transmitter / receiver 123.

In the broadband station device 11, when a cell is input from the subscriber access device 12, routing tag information recognizable by the IPC processor 111 or the OAM processor 112 is added by referring to a routing table stored therein. Input to each processing unit.

As described in detail above, when the operational communication protocol processor of the present invention is used, reliable monitoring of data is possible because of continuous monitoring and failure of the operational communication channel between the broadband station device and the subscriber access device in the ATM base access device. This has the advantage of being guaranteed, and the routing circuit for IPC data processing is simplified by designing a cell routing structure that can handle the IPC cell the same as a general service cell.

In addition, the IPC channel operation method can be applied to the same number of subscriber access devices to the broadband office device, which is advantageous in terms of scalability of the system.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (8)

Asynchronous transmission mode (ATM) -based access, which includes a broadband local station located at the national office and a subscriber access unit located at the subscriber side to provide voice level, leased lines, and broadband services to subscribers in a high-density area. In the apparatus, An IPC processing unit for generating an ATM cell via a transmission control protocol-Internet protocol (TCP / IP) stack after generating an interprocessor communication (IPC) data when an operator command or report is generated automatically, and performing the reverse function and the reverse function; OC processing unit to monitor the failure of IPC channel of IPC processing unit and to identify the cause of failure in case of failure, and analyze routing tag information of cells inputted from IPC processing unit through cell bus A broadband communication device comprising an operation communication protocol processor including an optical transmission / reception unit for receiving and transmitting an IPC cell corresponding to the terminal to the subscriber access device and classifying cells through a built-in routing table; An IPC processing unit for generating an ATM cell via a transmission control protocol-Internet protocol (TCP / IP) stack after generating an interprocessor communication (IPC) data when an operator command or report is generated automatically, and performing the reverse function and the reverse function; Operation / maintenance (OAM) processing unit to monitor the failure of IPC channel of IPC processing unit and quick cause of failure in case of failure, and virtual path identifier (VPI) value of the cell inputted from cell broadband station through cell bus Asynchronous transmission mode base, characterized in that the subscriber access device comprises an operational communication protocol processor comprising an optical transmission and reception unit for transmitting and removing routing tag information from cell information after transmission. Access device. The method of claim 1, IPC channels for centralized management control of a plurality of subscriber access devices in the broadband office device are connected by point-to-point and exist as many as the number of subscriber access devices. Asynchronous transmission mode base access device, characterized in that the transmission and reception of the operation communication data using the IPC cell of the same VPI value up and down. The method of claim 1, The IPC processing unit included in each of the broadband station apparatus and the subscriber access unit converts the operational communication data to be transmitted to the mutual device into a specific type of message via TCP / IP, and analyzes the message input from the IPC cell processing unit. An IPC data processor; An IPC cell processing unit performing a recombination function on a specific type of ATM cell inputted from a mutual device, and transmitting data converted into a message format to the IPC data processing unit; Creates an ATM cell by dividing a specific type of message received from the IPC data processing unit, and transmits it to the routing processing unit by adding a routing tag when transmitting it to the subscriber access device, and routing tag when transmitting to the broadband station device. An IPC cell generation unit for omitting information and transmitting the information to the routing processing unit; And a routing processor configured to perform a cell bus interface function in each device to route data to an optical transmitter / receiver in each device so that data can be transmitted / received. The method of claim 1, The OAM processing unit respectively configured in the broadband communication device and the operating communication protocol processor in the subscriber access device uses the continuity check cell to constantly monitor the IPC channel, and uses the loop back cell to determine the cause of failure when the IPC channel fails. Asynchronous transfer mode base access device. The method of claim 1, In order to generate operational communication data into an IPC cell in the operational communication protocol processor in the broadband station apparatus and the subscriber access device, IPC data, which are essential data for system operation such as alarm monitoring function, fault diagnosis function, fault recovery function, testing, performance monitoring function and configuration status setting function, TCP / IP information, Ethernet address, ATM adaptation layer 5 (AAL5) and ATM cells, An asynchronous transmission mode base access device, characterized in that to use a protocol stack made up of physical layer information. The method of claim 5, And the IP address and the Ethernet address are assigned with unique values for each subscriber access device in order to maintain compatibility with the subscriber access device connected to the broadband office device. The method of claim 1, And a light transmitting / receiving unit in the broadband station device includes a routing table for routing an IPC cell. The method of claim 1, And the optical transmitter / receiver in the subscriber access device uses only the VPI value of the IPC cell header as routing information to route the IPC cell.