KR100265072B1 - Asynchronous transfer mode access device and method - Google Patents

Abstract

Disclosed are an apparatus and a method for asynchronous transfer mode access. The apparatus is connected to a plurality of subscribers, the circuit interface unit for circuit matching and framing functions, the frame relay protocol processing unit for the frame relay service subscriber, the asynchronous transmission mode protocol processing unit for the asynchronous transmission mode subscriber, the circuit emulation circuit for the subscriber A service processor, a CPU and memory controller for controlling switching by designating an input / output port of a switch, and a switch unit for switching data input from a framer to the appropriate protocol processor under the control of the CPU and memory controller. In this method, modifications input from the network management system are input to the CPU and memory control unit via the network management system interface module, and the CPU and memory control unit causes the crosspoint switch to switch data arbitrarily input to the corresponding module. To perform the operation.

Description

Asynchronous transfer mode access device and method

The present invention relates to an asynchronous transfer mode (ATM) access device and method for accommodating various services, and more particularly, from one protocol processing board to each service regardless of the type of service of an input port. The present invention relates to an apparatus and a method for classifying and processing to facilitate user's operability and maintenance.

1 shows an implementation diagram of a service module in a conventional asynchronous transfer mode access device. In general, an asynchronous transmission mode access device is a device used by a high speed network operator to connect an existing tens of Kbps-class data communication service or an existing network to an asynchronous transmission mode network, and is a frame relay service or a circuit emulation service. (Circuit Emulation Service), asynchronous transmission mode cell relay service (ATM cell relay service) provides a variety of services.

In order to provide various services as described above, the conventional asynchronous transmission mode access device provided an independent service protocol module for processing each service protocol.

As shown in FIG. 1, a protocol module for a frame relay subscriber, a protocol module for a circuit emulation subscriber, and a protocol module for an asynchronous transmission cell relay subscriber are separately configured to accommodate a subscriber requesting a corresponding service.

2 to 4 show a service module configuration diagram of the asynchronous transmission mode access device constructed as described above.

As shown in FIG. 2, the frame relay inputs are received, the frame relay protocol processing unit 202 receives the frame relay inputs, processes the frame format, processes the pure data, and then converts the data into an asynchronous transmission mode cell.

As shown in Fig. 3, the circuit emulation service input of T1 or E1 is input via the T1 or E1 line connection unit 301, and a circuit emulation protocol processing unit for generating an asynchronous transmission mode cell from this frame type input ( 302).

4 shows a conventional asynchronous transmission mode service input to a T1 or E1 line connection 401, extracts a cell from the asynchronous transmission mode protocol processing section 402 and converts the header of the cell. It then processes the signaling protocol and sends it to the switch or MUX module.

However, the conventional asynchronous transmission mode access device configured as described above requires a change in cabling and additional purchase of hardware modules when a change in service of a subscriber already connected occurs.

For example, if a subscriber receives Frame Relay service and purchases an Asynchronous Router to receive asynchronous transfer mode service, and there is no remaining port of the asynchronous transfer mode service module, the network operator can There was a problem in that a separate asynchronous transmission mode service module should be purchased and mounted in a system. Thus, delays in service and additional expenses are required.

Each of the following patents is a patent for the technical field related to the present invention. That is, "Asynchronous Transfer Mode Switching System for Accessing I / O Links with Different Transfer Rates" by Kozaki Wong et al., US Pat. No. 5,446,738 et al., "Asynchronous Transfer Mode Meltplexing System" by Kim Kyeong S Wong. , US Pat. No. 5,509,007 to Takashima, et al., "Cell Multiplexing Apparatus for Processing Multiple Items of Information," US Pat. 5,450,411, "Network Interfaces for Multiplexing and Demultiplexing Isochronous and Burst Data Streams in Asynchronous Transmission Mode."

However, none of the above patents present or describe an asynchronous transmission mode access apparatus and method of the present invention.

The present invention is to solve the problems as described above, even if the service type of the already installed subscriber is changed, and receives a service change command from the network management system (Network Management Syst-em: NMS) to control the crosspoint switch in software It is an object of the present invention to provide an apparatus and method for performing a service change immediately without changing the cabling or adding hardware.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a mounting diagram of a service module in a conventional asynchronous transfer mode access device.

2 is a block diagram of a conventional frame relay service module.

3 is a block diagram of a conventional circuit emulation service module.

4 is a block diagram of a conventional asynchronous transmission mode cell relay service module.

5 is a functional configuration diagram of an asynchronous transmission mode access device according to an embodiment of the present invention.

6 is a flowchart illustrating a flow of an asynchronous transmission mode access method according to an embodiment of the present invention.

7 is a service module implementation diagram in an asynchronous transmission mode access device to which the present invention is applied.

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

201, 301, 401: T1 or E1 line connection

202: frame relay protocol processing unit

302: circuit emulation protocol processing unit

402: asynchronous transfer mode protocol processing unit

501: line interface unit

502: crosspoint switch unit

503: frame relay protocol processing unit

504: asynchronous transfer mode protocol processing unit

505: a circuit emulation service processor

506: CPU and memory control unit

The asynchronous transmission mode access device according to the present invention, which was created to achieve the above object, includes a circuit interface unit for connecting and connecting a plurality of subscribers to perform circuit matching and framing functions, a frame relay protocol processing unit for a frame relay service subscriber, and asynchronous transmission. Asynchronous transmission mode protocol processing unit for mode subscribers, circuit emulation service processing unit for subscribers, CPU and memory control unit for controlling switching by designating the input / output port of the switch, control of the CPU and memory control unit And a switch unit for switching to the appropriate protocol processing unit.

In a preferred embodiment of the present invention, the subscriber is preferably T1 or E1.

The CPU and memory control unit receives an instruction of a network management system interface module to designate an input / output port.

The CPU and memory control unit manages the protocol modules, and the switch unit is preferably a crosspoint switch.

A preferred embodiment of the asynchronous transmission mode access method for achieving another object of the present invention comprises the step of receiving a modification, the step of receiving data regardless of the type, the step of switching the input data by type.

In another embodiment of the present invention, the modification may be modified by any service of any port, and it is preferable that the modification is input by software in a network management system.

The switching of the types may include transferring the modifications to the CPU and memory controller, and controlling the switch unit to output data connected to a specific input port to a corresponding protocol processor, according to the control. Preferably, the switch further comprises the step of switching.

In the step of controlling the switch unit by the CPU and memory control unit, the CPU and memory control unit preferably transmits the switching information to the switch unit, the switching information is preferably in accordance with the service attribute of each port from the configuration management module of the network management system Preferably, the switching information is transmitted at system initialization of the asynchronous transmission mode access device.

While the invention is susceptible to various modifications and alternative forms, only specific embodiments thereof are shown in the drawings and will be described in detail.

It is to be understood, however, that the invention is not limited to the specific forms referred to in the specification, but rather that the invention is defined by the appended claims, all modifications, equivalents, and substitutes falling within the spirit and scope of the invention. It should be understood to include.

Hereinafter, an asynchronous transmission mode access apparatus and method of the present invention will be described with reference to the accompanying drawings.

5 is a functional block diagram of an asynchronous transmission mode access device according to an embodiment of the present invention.

According to an embodiment of the present invention, the asynchronous transmission mode access device connects a plurality of T1-class or E1-class subscribers to perform line matching and framing functions, such as a line interface unit 501 and a framer. Crosspoint switch unit 502 and frame relay service for switching a plurality of T1 or E1 level data inputted from the control unit to the appropriate protocol processing unit 503, 504, 505 under the control of the CPU and memory control unit 506. It manages the frame relay protocol processing unit 503 for the subscriber, the asynchronous transmission mode protocol processing unit 504 for the asynchronous transmission mode subscriber, the circuit emulation service processing unit 505 for the circuit emulation subscriber and this protocol module, and manages the network management system. Set the input / output port of the crosspoint switch by receiving the command of the interface module. For controlling it consists of a CPU and a memory control section 506.

According to another embodiment of the present invention, among the N T1 or E1 subscribers connected through the circuit interface unit 501, port 1 provides a frame relay service, port 2 provides an asynchronous transmission mode service, and port 3 provides a circuit emulation service. Assume the requesting subscriber.

Then, the N T1 or E1 inputs are first performed with line matching and framing functions in the line interface unit 501, and as the output, N serial data are input to the crosspoint switch unit 502 regardless of the type (604). ).

The crosspoint switch unit 502 is used to initialize the service attributes (frame relay, asynchronous transmission mode) of each port (port 1 to port N) from the configuration management module of the network management system when the asynchronous transmission mode access device system is initialized. Etc.) and receives the switching information from the CPU and the memory controller 506 (603) and performs the switching function (606).

That is, port 1 switches to frame relay service processor 503, port 2 switches to asynchronous transfer mode protocol processor 504, and port 3 switches to circuit emulation protocol processor (607).

As described above, when it is necessary to change the service of a particular subscriber during use by configuring an asynchronous transmission mode processing device, the network operator inputs modifications in the network management system without changing cables or adding hardware as in the prior art. It can be done in software.

7 is a flowchart illustrating a flow of an asynchronous transmission mode access method according to an embodiment of the present invention.

According to another embodiment of the present invention, when port 3 is a circuit emulation subscriber and wants to change it to a frame relay subscriber, if a modification is input from the network manager system (S1), the network manager of the asynchronous transmission mode access device When the interface module receives this command and transfers it to the CPU and memory control unit 506 of the protocol module (S2), the CPU and memory control unit 506 controls the crosspoint switch unit 502 (S3).

Regardless of the type, even when data is input (S6), the data is transferred to the switch unit for processing (S7). Switching (S4) occurs so that the port 3 data connected to a specific input port of the crosspoint switch unit 502 is output to the frame relay protocol processing unit, and transfers data according to each processing unit (S5).

6 shows an example in which a service module is implemented in the asynchronous transmission mode access device to which the present invention is applied. This allows software to control the input to the line interface processor to handle any service.

According to the present invention operating as described above, when a service change of a subscriber port is required, any service can be provided to any port that can be easily changed by software without changing cabling or adding hardware, and is individually provided to each protocol module. The CPU, the memory control unit and the line interface unit used in common can be used in common. Therefore, unnecessary space can be reduced and material costs can be reduced.

Claims (12)

A line interface unit for connecting a plurality of subscribers to perform line matching and framing functions; A switch unit configured to switch data input from the framer to a suitable protocol processor under control of the CPU and the memory controller; A frame relay protocol processor for processing data received from the switch unit; An asynchronous transmission mode protocol processing unit processing data received from the switch unit; A circuit emulation service processor which processes data received from the switch unit; And And a CPU and a memory control unit for controlling switching to each protocol processing unit by transferring information to the switch unit. The asynchronous transmission mode access device according to claim 1, wherein the subscriber is T1 or E1. The apparatus of claim 1, wherein the CPU and the memory controller designate an input / output port by receiving a command of a network management system interface module. 2. The apparatus of claim 1, wherein the CPU and memory control unit manages the protocol modules. The asynchronous transmission mode access device according to claim 1, wherein the switch unit is a crosspoint switch. A line interface unit for connecting a plurality of subscribers to perform line matching and framing functions; A switch unit configured to switch data input from the framer to a suitable protocol processor under control of the CPU and the memory controller; A frame relay protocol processor for processing data received from the switch unit; An asynchronous transmission mode protocol processing unit processing data received from the switch unit; A circuit emulation service processor which processes data received from the switch unit; And In the asynchronous transmission mode device including a CPU and a memory control unit for controlling the switching to the respective protocol processing unit by transferring information to the switch unit, Receiving a service change; Receiving data in the interface unit regardless of the type; And And switching the input data by type. 7. The method of claim 6, wherein said service change can be modified to any service on any port. 8. The method of claim 7, wherein the service change is input in software at a network management system. The method of claim 6, wherein the switching of the input data by type Delivering the modifications to a CPU and a memory controller; Controlling the switch unit to output data connected to a specific input port to a corresponding protocol processor; And And switching the switch according to the above control. 10. The method of claim 9, wherein the CPU and memory controller controls the switch unit, wherein the CPU and memory controller transmits the switching information to the switch unit. 12. The method of claim 10, wherein the switching information is based on a service attribute of each port from a configuration management module of a network management system. The method of claim 10, wherein the switching information is transmitted at system initialization of the asynchronous transmission mode access device.