KR100307493B1 - Frame relay network access device in the isdn switching system - Google Patents

Abstract

An object of the present invention is to provide a frame relay network matching device for allowing a general general information communication network subscriber who does not have a frame relay network matching function to directly receive a frame relay network service through a corresponding general information communication network switching system. Provided frame relay network matching device is respectively provided in subscriber and relay line matching subsystem provided in switching system, and link setting and internet protocol for transmitting point-to-point protocol frame in cooperation with telephony processor (TP) in subsystem. A point-to-point protocol is provided in a redundant structure with a frame relay network matching control unit that provides address and data link connection identifier information for Internet traffic routing processing, and is transmitted from a subscriber through a route routed by the frame relay network matching control unit. The frame is assembled and transmitted in the format used in the frame relay network, while the data transmitted from the frame relay network is frame relay network matching handler including a plurality of frame relay network matching handlers that are decomposed and transmitted in the form of point-to-point protocol frames. It is composed of groups. Therefore, general general information communication network subscriber can receive frame relay network service at high speed without having to provide separate frame relay network terminal.

Description

FRAME RELAY NETWORK ACCESS DEVICE IN THE ISDN SWITCHING SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matching technology between an Integrated Services Digital Network (hereinafter referred to as ISDN) switching system and a Frame Relay network. Specifically, the present invention relates to each subscriber and relay switching subsystem (Access Switching Subsystem). The present invention relates to a frame relay network matching device distributed and received.

With the continuous development of the information society, various methods have been proposed as alternatives to transmit more information at high speed. Frame relay is one of them. The concept of frame relay was proposed in 1986 as a communication request for data that treats multiple LANs (remote LANs) between remote locations as if they were one LAN. It is suitable for handling data information in LANs that can be handled and bursty, and users can freely select more than the upper sublayers of the data link layer, and in LANs such as Transmission Control Protocol / Internet Protocol (TCP / IP). It has good affinity with general upper layer protocol.

Due to these features, the existing frame relay service accommodates enterprise groups using wide area network (WAN) services and leased lines to provide lower cost services. Recently, due to the explosive demand for explosive Internet services, the public packet network backbone network has been replaced by frame relay.

However, if the user wants to receive the service through the frame relay network, as shown in FIG. 1, a router having a dedicated line and a frame relay network connection function of the telephone company should be used, and a general analog modem subscriber or an ISDN subscriber wants to use the frame relay network. In this case, a data network interworking device such as AICPS (Advanced Information Communication Processing System), which is a separate network matching device, should be used.

Accordingly, the present invention provides a frame relay network matching device installed in a sub-system performing each subscriber or relay line connection so that a general Telecommunication network subscriber can be directly routed to a frame relay network to receive a service in a general information communication network switching system. The purpose is to provide.

In order to achieve the above object, an apparatus according to the present invention is connected between a time switch and a frame relay network in each subsystem providing a data connection path with a subscriber connection module and / or a trunk line connection module, and a plurality of general information and communication networks. (ISDN) A frame relay network matching device that provides a service through a frame relay network to a subscriber, the point-to-point protocol (PPP) transmitted from a predetermined integrated telecommunication network subscriber through a time switch to an assigned Internet Protocol (IP) address. Receives a frame, assembles the received point-to-point protocol frame according to the frame relay network format, transfers it to the frame relay network through the assigned data link connection identifier (DLCI) channel, and provides the frame relay network service information provided from the frame relay network. Is decomposed to a predetermined information network subscriber. A plurality of matching with a frame relay network handler for transmitting a frame relay network registration handler group; When a frame relay allocation and call is requested from a predetermined Telecommunication Information Network subscriber, the link layer is connected between a time switch and a corresponding frame relay network matching handler to receive a point-to-point protocol frame, and after link layer connection processing, When the Internet protocol address allocation is requested from the frame relay network matching handler, the frame relay network matching controller is configured to assign an internet protocol address and a data link connection identifier to perform routing processing.

1 is a structure diagram of a conventional frame relay service,

2 is a block diagram of a subsystem accommodating a frame relay network matching device according to the present invention;

3 is a functional block diagram of the frame relay network matching controller (FRADC) shown in FIG.

4 is a functional block diagram of the frame relay network matching handler (FRADH) shown in FIG.

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

100: access switching processor (ASP) 110: subscriber matching unit (SI)

120: time switch and link unit (TSL) 130: telephony processor (TP)

140: frame relay network matching device 141: frame relay network matching controller

142-1 to 16: Frame relay network matching handler

301 and 420: control unit

302: shared buffer 303: routing table

304: IPC buffer 402: time switch matching unit

404: HDLC section 410: First buffer

430: second buffer 440: frame buffer

442: LAPF control unit 446: buffer arbitration unit

448: shared memory 450: L bus matching unit

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

FIG. 2 is a block diagram of a subsystem having a frame relay network matching device according to the present invention in an integrated information communication network (hereinafter referred to as ISDN) exchange system, which provides a frame relay service by including a frame relay service module (not shown). Access Switching Processor (hereinafter referred to as ASP) 100 that performs higher functions such as connection, disconnection, and management of physical paths between the subscriber to be received and the frame relay network matching device 140 to be described later. Subscriber Interface (SI) 110 to perform connection with the ISDN subscriber bit stream data is assembled in the form of a frame relay cell to perform a frame relay network connection and provide a frame relay cell form from the frame relay network Frame relay network matching device 140, which decomposes the service information to be provided to the corresponding ISDN subscriber, A time switch and link unit (hereinafter referred to as TSL) 120 which provides a data connection path between the self matching unit 110 and the frame relay network matching device 140 is not shown in the ASP 100. Sub-functions for controlling functions such as subscriber matching unit 110, time switch and link unit 120, and frame relay network matching device 140 to enable frame relay network matching while transmitting and receiving control signals with the frame relay service module. It consists of a Telephony Processor (abbreviated as TP) 130 to perform.

In particular, the frame relay network matching device 140 is connected to the TSL 120 and the frame relay network to perform an actual frame relay network matching function (Frame Relay network access device handler, hereinafter abbreviated as FRADH) ( 142) and TP 130 interworking with each other to establish a frame relay network service and assign an IP address and a Data Link Connection Identifier (DLCI, hereinafter abbreviated as DLCI) on the FRADH 142. Frame relay network matching control unit (hereinafter referred to as FRADC) 141, which includes a total of 16 pieces of FRADH (142) per subsystem, FRADC (141) to operate in a redundant structure It is provided.

The subsystem configured as shown in FIG. 2 operates as follows to connect with the frame relay network.

First, the ISDN subscriber requests a bearer channel connection between the user and the frame relay network matching device 140 by performing a user-network access protocol procedure through the D channel. That is, it requests B, D, and H channels to be used for frame transmission. The B channel is an information channel, the D channel is a signal or information channel, and the H channel is a high speed information channel. This request signal is transmitted to the ASP 100 via the SI 110 and the TP 130. The SI 110 is implemented as an existing BSI access module (BRI (Basic Rate Interface) module) when a subscriber who wants to receive a frame relay service through an ISDN exchange system is 64Kbps, and requires a high speed service of 64Kbps or more. In the case of an H-channel subscriber, it is implemented as a PSI access module (a module implemented with a primary rate interface (PRI)).

When the bearer channel connection request is received through the TP 130, the ASP 100 requests an outgoing frame relay assignment to the FRADC 141 of the frame relay network matching device 140 to link access procedure on the frame relay. Allocates a link. And after determining the time switch (TSL) channel for the connection between the SI 110 and the corresponding FRADH (142-1, ..., 142-16) in the frame relay network matching device 140, the frame relay network matching device ( When the frame relay call is requested to the FRADC 141 of 140, and the response signal according to the call request is received from the FRADC 141, the ISDN subscriber's terminal (not shown) and the SI 110 can receive the PPP frame. Perform a link layer connection with).

As shown in FIG. 3, the FRADC 141 includes a control unit 301 for performing an IPC (Inter Processor Communication) task, an MMC (Man Machine Communication) task, and other tasks required to operate the FRADC 141. A shared buffer 302 connected in parallel with the FRADHs 142-1 to 6, a routing table 303, and an IPC buffer 304 connected to the TP 130. When the outgoing frame relay allocation request and the call request are transmitted from the ASP 100 through the 130, the IPC buffer 304 transmits the request to the controller 301 through the IPC buffer 304. The IPC buffer 304 may transmit and receive data and statistical data related to call processing, operation, and maintenance in the IPC form with the TP 130. Accordingly, the upper processor can manage the ISDN subscriber and the corresponding switching information IP address.

The controller 301 allocates the LAPF link with reference to the routing table 303 and transmits a response signal according to the frame relay request to the TP 130 through the IPC buffer 304. PPP layer between the ISDN subscriber and the corresponding FRADH (142-1 to 16) in the frame relay network matching device 140, 142-1 is referred to for reference for convenience of description). The connection is made.

After the PPP layer connection is made, if the IP (Internet Protocol) address allocation is required in the PPP frame format from the ISDN subscriber to the corresponding FRADH 142-1 through the B and H channels established through the TSL 120, the corresponding FRADH 142-1 transmits to the control unit 301 through the shared buffer 302. The shared buffer 302 is composed of dual port buffers for L buses connected in parallel with the respective FRADHs 142-1 to 16 in the frame relay network matching device 140, and the FRADHs 142-1 to 16 and the FRADC 141. Enable data transfer between each other.

When the IP address allocation request is received through the shared buffer 302, the controller 301 allocates an IP address and a DLCI (Data Link Connection Identifier) channel with reference to the routing table 303. The routing table 303 is used for routing Internet traffic because the mapping table 303 includes mapping information of subscriber information of the corresponding switching system and address of a network connected through a frame relay network such as the Internet. When performing routing processing with reference to the routing table 303, if the destination address is an IP datagram having an Internet address other than the Internet address assigned to the switching system, the existing default as shown in FIG. In the same way as the route concept, the link number to the ISP is assigned and routed to the ISP's router of the IP datagram.

Through this routing process, a path is formed between the ISDN subscriber terminal, the frame relay network matching device 140, and the frame relay network, and the PPP frame received from the ISDN subscriber is transmitted to the frame relay network through the corresponding DLCI channel. The frame relay cell transmitted from the frame relay network through the DLCI channel is transmitted to the corresponding ISDN subscriber.

FRADH 142 provided in the frame relay network matching device 140 for transmission and reception for the PPP frame is configured and operated as shown in FIG.

Referring to FIG. 4, the FRADH 142 includes a High Data Link Ccntrol (HDLC) unit 404, a first buffer 410 for PPP, a controller 420, and a second buffer 430 for LAPF. And a frame buffer 440, a LAPF control unit 442, a buffer arbitration unit 446, a shared memory 448, and an L bus matching unit 450.

The FRADH 142 configured as described above is operated as follows.

First, the time switch matching unit 402 performs a physical matching and a rate matching function with the TSL 120. In case of one frame relay network matching board, 64Kbps 32 channel or 2.048Mbsp 1 channel can be selected to transmit / receive data.

In order to perform the PPP layer processing, the HDLC unit 404 may match a 64Kbps data transmission channel from the TSL 120 to access a single channel and an n × 64Kbps channel. The IP data transmitted from the ISDN subscriber is encapsulated in the PPP frame and received. The LCP (Link Control Protocol) procedure is performed to access the PPP layer. Using LCP, you can establish a PPP layer 2 connection and test the link layer. The PPP layer processed through the HDLC unit 404 is stored in the receive queue 411 in the first buffer 410. On the other hand, the cell information received and decomposed from the frame relay network is stored in the transmission queue 412, transmitted to the HDLC unit 404, formatted into a PPP frame, and transmitted to the TSL 120 for transmission to the ISDN subscriber.

The controller 420 has an operating system having real-time task management, memory management, time management, etc. for smoothly performing the corresponding function of the FRADH 142-1. Do this. That is, the PPP frame stored in the reception queue 411 is read and transmitted to the transmission queue 431 in the LAPF buffer 430. The data stored in the transmission queue 431 is stored in the frame buffer 440 again, and the frame buffer 440 is controlled by the control unit 420 to transmit the stored data to the LAPF control unit 442 in units of frames. The LAPF control unit 442 assembles the data transmitted in the frame unit from the frame buffer 440 into a frame relay cell and transmits the data to the frame relay network.

Meanwhile, when frame relay network service information is transmitted from the frame relay network, the LAPF controller 442 decomposes the received frame relay cell information and transmits the received frame relay cell information to the frame buffer 440. At this time, since the transmitted data is transmitted in a form in which pure subscriber information and a control signal are separated, the frame buffer 440 stores them separately. The pure subscriber information is transmitted to the first reception queue 432, and the control signal is transmitted to the second reception queue 433 to be stored separately. The separated and stored information is read by the control unit 420 and transmitted to the transmission queue 412, read by the HDLC unit 404, converted into a PPP frame format, and transmitted to the TSL 130.

As described above, the transmission / reception queues 411 and 412 provided in the first buffer 410 are configured to be allocated for each subscriber, and the transmission / reception queue 431 provided in the second buffer 430 to transmit and receive the PPP frame and the frame relay service information. 432 and 433 are configured to be allocated for each DLCI channel. Therefore, the transmission / reception queue to be used among the transmission / reception queues provided in the first buffer 410 is determined by the IP address provided by the FRADC 141, and the transmission / reception queue to be used among the transmission / reception queues provided in the second buffer 430 is the FRADC 141. Is determined by the DLCI channel provided by The resources for the allocated DLCI and IP address are managed by the control unit 420, and the allocation and release thereof are performed by the communication with the FRADC 141.

The buffer arbitration unit 446 arbitrates the frame buffer 440 so that the control unit 420 and the LAPF control unit 442 do not access the same time, and the HDLC unit 404 and the control unit 420 mediates processing so that access is not simultaneously processed.

The FRADC 141 transmits and receives data through the shared memory 448 and the L bus matching unit 450. That is, when the PPP link layer connection is finished and the IP address allocation request from the subscriber is received, the IP address allocation is requested to the FRADC 141 managing the table, and the shared memory 448 and the L bus matching unit 450 are connected. When the allocated IP address and DLCI channel information are received from the FRADC 141, the IP address is transmitted to the ISDN subscriber, and the DLCI channel is transmitted to the LAPF controller 442 to access the frame relay network. For this process, the shared memory 448 uses dual port memory, and the L bus matching unit 450 performs matching processing so that 16-bit addresses and data are muxed and transmitted through the L bus. .

As described above, the present invention implements such that the frame relay network matching device is distributed to each subscriber and relay line connection subsystem in the integrated telecommunication network switching system, so that many ISDN subscribers having a general terminal are connected to the frame relay network. The advantage is that you can search the provider's database or content providers (CP) on the Internet at speeds above 64 Kbps.

Claims (5)

Frame relay network which is connected between time switch and frame relay network in each subsystem that provides data connection path between subscriber access module and relay line connection module and provides services through the frame relay network to many general Telecommunication network subscribers. In the matching device: Receives a point-to-point protocol frame transmitted from a predetermined integrated information network subscriber through the time switch with an assigned Internet protocol address, and assembles the received point-to-point protocol frame according to the frame relay network format to allocate an assigned data link connection identifier. A frame relay network matching handler including a plurality of frame relay network matching handlers for transmitting to a frame relay network through a channel and decomposing the frame relay network service information provided from the frame relay network to the predetermined integrated telecommunication network subscribers. group; If a frame relay allocation and call is requested from the predetermined general information communication network subscriber, the link layer is processed to be connected between the time switch and the corresponding frame relay network matching handler to receive the point-to-point protocol frame, and the link layer After the connection process, if the Internet protocol address assignment is requested from the corresponding frame relay network matching handler, includes a frame relay network matching control unit for routing by assigning the Internet protocol address and the data link connection identifier, The frame relay network matching controller is configured in a redundant structure, and each frame relay network matching controller is connected to the frame relay network matching handler in a parallel bus structure. . The method of claim 1, The frame relay network matching handler includes: a time switch matching unit (402) for performing a physical matching and speed matching function with the time switch; A first control unit (404) for performing the point-to-point protocol layer processing of the point-to-point protocol frame received from the subscriber; A first buffer 410 for storing data hierarchically processed by the first controller 404 or transmitting the stored data to the first controller 404; A second controller 442 for performing matching processing between the point-to-point protocol frame format and the frame relay network format through the assembling or disassembling process; A frame buffer 440 for storing data assembled or disassembled by the second control unit 442 so as to be transmitted in units of frames; A second buffer 430 for storing information output from the frame buffer 440 or transmitting the stored information to the frame buffer 440; A matching unit (450, 448) for matching processing to transmit and receive information with the frame relay network matching control unit; The second buffer 430 reads a point-to-point protocol frame stored in the first buffer 410 according to a route routed by the Internet address and data link connection identifier information transmitted through the matching units 450 and 448. Frame relay network matching in the integrated information communication network switching system, characterized in that it comprises a third control unit (420) for transmitting the transmission to the first buffer 410 and reading the information stored in the second buffer (430) Device. The method of claim 2, The first buffer 410 has a structure in which a transmission / reception queue is allocated to each subscriber of the comprehensive information communication network, and the second buffer 430 has a structure in which a transmission / reception queue is allocated for each data link connection identifier. The receiving queue provided in the second buffer 430 is provided for the pure data transmission and the control signal separately frame relay network matching device in the integrated telecommunications network switching system. The method of claim 3, wherein The frame relay network matching controller includes a routing table using a mapping relationship between the plurality of general information communication network subscriber information and the Internet address to route traffic on the frame relay network matching handler. Frame relay network matching device The method of claim 2, The frame relay network matching handler arbitrates the first buffer 410 such that the first control unit 404 and the third control unit 420 do not simultaneously access the frame relay network matching handler, and controls the frame buffer 440 to the second control unit ( 442) and a buffer arbitration unit (446) for arranging such that the third control unit (420) does not access at the same time.