KR100258259B1 - Frame Relay Module in ISDN Switching System - Google Patents

Abstract

PURPOSE: A frame relay module is provided to quickly and efficiently perform frame relay protocol and data functions in ISDN exchange system. CONSTITUTION: The module(210) includes a plurality of frame relay handlers(25), each of which is connected to a time switch(22) and a sub-highway(23), and receives frame data provided thereto from a subscriber through the time switch(22). The frame relay handlers(25) process the received frame data based on a control signal to perform frame switch of one another, and apply a control signal for data switching of one another to an MSCI(26) through an U-line(24).

Description

Frame Relay Module of ISDN Switching System

The present invention relates to an ISDN switching system, and more particularly, to a frame relay module of an ISDN exchanger configured in a subscriber matching switching subsystem in an ISDN switching system.

Currently, most data networks operate based on packet transmission technology. Especially in public data networks, packet transmission technology based entirely on the X.25 standard is used as the international standard for network layers 1, 2 and 3. I am in charge.

Packet services within an ISDN exchange can be provided in two ways: Case A and Case B of the X.31 Recommendations. In the TDX-10 ISDN exchange, there is packet processing within the ISDN exchange, allowing subscribers to access B and D channels. The case B method can be used by all.

The TDX-10 packet-switched service does not distribute the packet handling subsystem, the packet handling subsystem, to each subscriber interface module, and all packet traffic passes through the TST switching network within the TDX-10. Switching Subsysem for Packet Switching (ASS-P) forms a centralized structure that is concentrated and processed.

However, the TDX-10 ISDN packet-switched architecture uses the X.25 protocol to perform complex processing such as error detection and recovery to ensure end-to-end transmission quality. Therefore, in order to meet the service needs of users in the future, a better way of technology is required.

On the other hand, in recent information society, there is a demand for a protocol that can replace the existing X.25 that can transmit more information at high speed, and frame relay is proposed as an alternative. The existing packet protocol is designed to guarantee the end-to-end transmission quality due to the lack of the development of the initial communication path. Therefore, error detection, error recovery, flow control, etc. are performed in the data link layer. DTP (Data Transfer Protocol) of X.25 PLP (Packet Layer Protocol) was implemented.

However, due to the development of the current transmission technology, the error occurrence rate is significantly lowered, thereby minimizing various control functions at the data link layer. In the network, only the core functions of Layer 2 required for data transmission are implemented. Frame relays, which enable short delay times and high speed transmission, have emerged by allowing user devices to perform them when needed. In fact, frame relay was proposed in 1986 as the evolutionary step of packet communication in ISDN, and is currently being spread worldwide for use in high-speed data communication.

First, referring to FIG. 1, a frame relay module of a conventional ISDN switching system, as shown, the frame relay module 10 includes a frame relay handler for performing link level processing on frame relay data received from a subscriber. Framr relay Handler (hereafter abbreviated as FRH) (F1-Fn) and Frame Relay Controller board (hereinafter abbreviated as FRC) (1) that performs the exchange function between a plurality of FRH (F1-Fn). It is composed.

That is, the FRHs (F1-Fn) are connected to a time switch (TSW) 2 and a subhighway (SHW) 3 to receive a frame transmitted from the subscriber through the TSW 2, The received frame data is processed and frame exchanged with other FRHs (F1-Fn) under the control of the FRC (1). At this time, the FRC 1 is connected to the FRH (F1-Fn) and the parallel bus 5 called L-BUS to exchange data between the FRH (F1-Fn).

The FRC 1 controls the FRHs (F1-Fn) to enable frame data exchange between the FRHs (F1-Fn).

In addition, the FRC 1 matches the upper TP 7 and transmits call processing related messages, operation and maintenance related messages, and statistical data received from the FRH F1-Fn to the upper TP 7, thereby transmitting the TP 7. Control and operate the frame relay call.

At this time, the FRC 1 transmits frame data through the MSCI 6 when the frame call is exchanged between other sub-systems rather than a call within the same sub-system.

However, in the prior art, the transmission rate between FRC (1) and FRH (F1-Fn) has a transmission rate of 2Mbps but between FRC (1) and MSCI (6) having a large number of FRH (F1-Fn). Since the speed is up to 8Mbps and generally 6Mbps, a bottleneck occurs, which causes a transmission delay in the network.

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 a frame relay module of an ISDN exchanger that can perform a frame relay protocol and data functions more efficiently and quickly in an ISDN exchange system. .

In order to achieve the above object, the present invention provides a frame relay module configured in a subscriber matching exchange sub-system of an ISDN switch, connected to a time switch and a sub highway, and receives frame data transmitted from a subscriber through the time switch. A plurality of frame relay handlers for processing the received frame data according to a control signal and exchanging frames with each other, and applying control signals for data exchange to the frame relay handlers FR1-FRn through a U-link ( FR1-FRn) provides a frame relay module of the ISDN exchange.

1 is a block diagram of a frame relay module of an ISDN switching system according to the prior art,

2 is a block diagram of a frame relay module of an ISDN switching system according to the present invention;

<Description of the code | symbol about the principal part of drawing>

22: time switch 23: sub highway

27: telephony processor FR1-FRn: frame relay handler

210: frame relay module

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

First, referring to FIG. 2, a configuration diagram of a frame relay module of an ISDN exchange system is illustrated. As shown in FIG. 2, the frame relay module 210 performs link level processing on frame relay data received from a subscriber. (Framr relay Handler; FRH) (FR1-FRn).

That is, FRHs (FR1-FRn) are connected to a time switch (TSW) 22 and a subhighway (SHW) 3 to receive a frame transmitted from the subscriber through the TSW 22, The received frame data is processed and frame exchange is performed with other FRHs (FR1-FRn) under the control of a control processor embedded in the FRHs (FR1-FRn).

In addition, each FRH (FR1-FRn) is connected to the message switch (MSCI) 26 through the U-Link (24), allowing data communication with other subscriber matching subsystems (ASS), Communication with a higher telephony processor (TP) 27 and a high-level data link control (HDLC) format may be performed to perform call processing or to report operation and maintenance related information.

That is, as described above, the FRH (FR1-FRn), as well as its own FRH (FR1) information, share control information through the IPC (Inter Processor Communication) communication with other FRH (FR2-FRn) and each FRH (FR1-FRn) enables frame data exchange between each other, and controls frame data transmitted to other subscriber matching subsystems to transmit frame data in turn.

In addition, a buffer (not shown) is placed in each FRC (FR1-FRn) to prevent collision between MSCI and FRC due to speed difference.

Each FRH (FR1-FRn) matches the upper TP (27) and transmits the call processing-related messages of FRH (FR1-FRn) itself, operation and maintenance messages, and statistical data to the upper TP (27). Allow the 27 to control and operate the frame relay call.

At this time, each FRH (FR1-FRn) transmits frame data through the MSCI 26 when the frame call is exchange between other subsystems rather than calls within the same subsystem.

As described above, the present invention integrates the block in which the bottleneck of the frame relay handler occurs as described above, thereby facilitating the quick exchange of frame data in the ISDN exchange system.

The principles of the invention have been described above in connection with specific devices, which are described by way of example only, and are not limited to the spirit of the invention as described in the appended claims.

Claims (3)

A frame relay module configured in a subscriber match exchange subsystem of an ISDN exchange, It is connected to the time switch 22 and the sub highway 23, and receives the frame data transmitted from the subscriber through the time switch 22, and processes the received frame data according to a control signal to exchange frames with each other. And a plurality of frame relay handlers (FR1-FRn) for applying control signals for data exchange to the frame relay handlers (FR1-FRn) through a U-link. The method of claim 1, The frame relay handler FR1-FRn, The telephony processor 27 can control and operate the frame relay call by transmitting the call processing related message, the operation and maintenance related message, and the statistical data received in accordance with the upper TP 27 to the upper telephony processor 27. Frame relay module in an ISDN exchange. The method of claim 2, The frame relay control board 21, It is connected to the message switch (MSCI) 6 via the U-link 24 so that the frame data is exchanged between other sub-systems through the message switch 6 when the frame call is exchange between other sub-systems rather than a call in the same subsystem. Frame relay module for an ISDN exchange configured to transmit to a subsystem.

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