KR20020052067A - Circuit Board for Intermixture Accommodation Frame Relay and ATM Subscriber in ATM Switching System - Google Patents

Abstract

PURPOSE: A circuit board for mixing and receiving frame relay/ATM subscribers in ATM exchange is provided to possess a frame relay and an ATM subscriber boards to one circuit board, thereby using the boards on occasion demands and enhancing the economy. CONSTITUTION: A line interface unit(21) converts an analog signal applied from the line of ATM subscriber or frame relay subscriber into a digital signal and then applies the digital signal to a framer(22), and also converts a digital signal applied from the framer(22) into an analog signal and then applies the analog signal to a line. The framer(22) removes the frame among the signal applied from the line interface unit(21), extracts TDM signal and then transmits the signal to an HDLC(High-level Data Link Control) processor(23) or an ATM physical layer processing unit(26), and also processes the TDM signal applied from the HDLC processor(23) or the ATM physical layer processing unit(26) as a frame and then outputs the processed signal to the line interface unit(21). The HDLC processor(23) converts the TDM signal into a packet and then outputs the packet to a CPU(24) through a local bus and also, converts the packet applied from the CPU(24) through the local bus into the TDM signal and then outputs the TDM signal to the framer(22). The CPU(24) processes the packet and then outputs the packet to an SAR(Segmentation and Reassembly) processing unit(25), and also processes the packet applied from the SAR processing unit(25) to the HDLC processing unit(23). The SAR processing unit(25) separates the packet, interfaces with UTOPIA(Universal Test and Operations Physical Layer Interface for ATM) and then outputs the packet to a backboard(27) of ATM exchange, and also reassemblies the separated packet applied from the backboard(27) by the interface with UTOPIA and then outputs the packet to the CPU(24). An ATM physical layer processing layer(26) extracts an ATM cell from the TDM signal applied from the framer(21), interface with UTOPIA and then outputs the ATM cell to the backboard(27) of ATM exchange, and also converts the ATM cell applied from the backboard(27) by the interface with UTOPIA to TDM signal and then outputs the signal to the framer(22).

Description

Circuit Board for Intermixture Accommodation Frame Relay and ATM Subscriber in ATM Switching System

The present invention relates to an Asynchronous Transfer Mode (ATM) exchange, which has a function of a frame relay subscriber board and an ATM subscriber board in one circuit board, and is used as a frame relay subscriber board or an ATM subscriber board as needed. It relates to a frame relay / ATM subscriber mix circuit board at an ATM exchange.

In general, an ATM switch includes various circuit boards, and includes a frame relay subscriber board for connecting a frame relay subscriber and an ATM subscriber board for connecting an ATM subscriber.

The ATM subscriber board provided in the conventional ATM switch is provided with a line interface unit 1, a framer 2, and an ATM physical layer processor 3, as shown in FIG. When receiving a signal applied from the ATM subscriber side, the line interface unit 1 converts an analog signal applied from the line on the ATM subscriber side into a digital signal and applies it to the framer 2 side, and the framer 2 The TDM signal is extracted by removing the frame from the signal applied from the line interface unit 1 and output to the ATM physical layer processing section 3. The ATM physical layer processing section 3 displays the ATM from the TDM signal applied from the framer 2. The cells are extracted, matched with UTOPIA (Universal Test & Operations Physical Layer Interface for ATM), and output to the backboard 4 side of the ATM exchanger. In the case of transmitting a signal to the ATM subscriber side, the ATM physical layer processing unit 3 matches the UTOPIA from the backboard 4 to UTOPIA, converts the applied ATM cell into a TDM signal, and outputs it to the framer 2, where the framer ( 2) frames the TDM signals applied from the ATM physical layer processing section 3 and outputs them to the line interface unit 1 side. Accordingly, the digital signals applied from the framer 2 by the line interface unit 1 are analog signals. And convert it to the ATM subscriber line.

Meanwhile, as shown in FIG. 2, the frame relay subscriber board provided in the conventional ATM switch includes a line interface unit 11, a framer 12, a high-level data link control (HDLC) processor 13, and a CPU. (14; Central Processing Unit) and SAR (Segmentation and Reassembly) processing unit 15 is provided. When receiving a signal applied from the frame relay subscriber side, the line interface unit 11 converts an analog signal applied from the line on the frame relay subscriber side into a digital signal and applies it to the framer 12 side, and the framer 12 ) Extracts a TDM signal from the signal applied from the line interface unit 11 to extract the TDM signal, and outputs the TDM signal to the HDLC processor 13, where the HDLC processor 13 converts the TDM signal from the framer 12 into a packet. After converting and outputting the packet to the CPU 14 side through the local bus, the CPU 14 processes the packet applied from the HDLC processor 13 and outputs the packet to the SAR processing unit 15 side. The packet applied from 14) is divided, matched with UTOPIA, and output to the backboard 16 side of the ATM switch. In the case of transmitting a signal to the frame relay subscriber side, when the SAR processing unit 15 reassembles and divides the divided packet applied to the UTOPIA from the backboard 16 and outputs it to the CPU 14 side, the CPU 14 outputs the SAR processing unit. The packet applied from the processor 15 is processed and output to the HDLC processor 13, whereby the HDLC processor 13 converts the packet applied from the CPU 14 via the local bus into a TDM signal to the framer 12 side. Framer 12 outputs the TDM signal from the HDLC processor 13 to the line interface unit 11, and the line interface unit 11 outputs the digital signal from the framer 12. Is converted into an analog signal and output to the line side of the frame relay subscriber.

As described above, in the conventional ATM exchanger, the ATM subscriber board and the frame relay subscriber board are separately designed and manufactured to be applied to the system. Since it is necessary to install it, the economical efficiency is lowered, and in the manufacturing process, the ATM subscriber board and the frame relay subscriber board have to be manufactured separately, which leads to a problem in that productivity is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to provide both a frame relay subscriber board and an ATM subscriber board in one circuit board to a frame relay subscriber board or an ATM subscriber board as needed. To provide a frame relay / ATM subscriber mix circuit board in an ATM switch that can be used to improve economics.

1 is a diagram showing the configuration of an ATM subscriber board provided in a conventional ATM switch.

2 is a diagram showing the configuration of a frame relay subscriber board provided in a conventional ATM switch.

FIG. 3 is a diagram showing the configuration of a frame relay / HT subscriber subscriber circuit board in an ATM switch according to the present invention. FIG.

Explanation of symbols on the main parts of the drawings

21: line interface unit 22: framer

23: HDLC processor 24: CPU

25 SAR processing unit 26 ATM physical layer processing unit

A feature of the present invention for achieving the above object is a line interface unit for converting a signal received from the line into a digital signal, and converts the signal transmitted to the line side into an analog signal; A framer for extracting a TDM signal by removing a frame from the signal input from the line interface unit, and framing the TDM signal output to the line interface unit; An HDLC processor for converting a TDM signal input from the framer into a packet and converting a packet output to the framer side into a TDM signal; A CPU for processing packets input and output to the HDLC processor; Splitting the packet applied through the CPU from the HDLC processor and matching it to UTOPIA and outputting it to the backboard side of the ATM exchanger, reassembling the divided packet applied to UTOPIA from the backboard and outputting it to the HDLC processor side through the CPU A SAR processing unit; ATM physical layer which extracts ATM cell from TDM signal applied from the framer, matches it to UTOPIA and outputs it to the backboard side, converts ATM cell matched to UTOPIA from the backboard and converts it into TDM signal and outputs it to the framer side It includes a processing unit.

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

As shown in FIG. 3, the frame relay / ATM subscriber mix circuit board in the ATM switch according to the present invention includes a line interface unit 21, a framer 22, an HDLC processor 23, a CPU 24, and a SAR processor. 25 and the ATM physical layer processing section 26 are provided. The line interface unit 21 converts an analog signal applied from a line of an ATM subscriber side or a frame relay subscriber side into a digital signal and applies it to the framer 22 side, and applies a digital signal applied from the framer 22. It converts into analog signal and outputs it to the line side. The framer 22 extracts the TDM signal by removing the frame from the signal applied from the line interface unit 21 and outputs the TDM signal to the HDLC processor 23 or the ATM physical layer processor 26, and the HDLC processor 23 or the ATM physical. The TDM signal applied from the layer processing unit 26 is framed and output to the line interface unit 21 side. The HDLC processor 23 converts a TDM signal applied from the framer 22 into a packet and outputs the packet to the CPU 24 through the local bus, and converts a packet applied from the CPU 24 through the local bus into a TDM signal. Output to the framer 22 side. The CPU 24 processes the packet applied from the HDLC processor 23 and outputs it to the SAR processor 25, and processes the packet applied from the SAR processor 25 to the HDLC processor 23. The SAR processing unit 25 divides the packet applied from the CPU 24, matches it with UTOPIA, outputs it to the backboard 27 side of the ATM switch, and reassembles the divided packet that is matched and applied to the UTOPIA from the backboard 27. To the CPU 24. The ATM physical layer processing unit 26 extracts an ATM cell from a TDM signal applied from the framer 22, matches it with UTOPIA, outputs it to the backboard 27 side of the ATM switch, and matches the UTOPIA from the backboard 27. The applied ATM cell is converted into a TDM signal and output to the framer 22 side.

The frame relay / ATM subscriber mixed accommodating circuit board according to the present invention configured as described above can be used as a frame relay subscriber board or an ATM subscriber board as necessary.

First, the operation process in the case of using as an ATM subscriber board is as follows.

When receiving a signal applied from the ATM subscriber side, the line interface unit 21 converts an analog signal applied from the line on the ATM subscriber side into a digital signal and applies it to the framer 22 side, and the framer 22 The TDM signal is extracted by removing the frame from the signal applied from the line interface unit 21 and output to the ATM physical layer processor 26. At this time, the ATM physical layer processor 26 is applied to the TDM signal applied from the framer 22. The ATM cell is extracted, matched with UTOPIA, and output to the backboard 27 side of the ATM switch.

When transmitting a signal to the ATM subscriber side, when the ATM physical layer processing unit 26 matches the UTOPIA from the backboard 27 to convert the applied ATM cell into a TDM signal and outputs it to the framer 22, the framer 22 Frames the TDM signal applied from the ATM physical layer processing unit 26 and outputs it to the line interface unit 21 side. Accordingly, the line interface unit 21 converts the digital signal applied from the framer 22 into an analog signal. To the ATM subscriber line.

The operation process in the case of using it as a frame relay subscriber board is as follows.

When receiving a signal applied from the frame relay subscriber side, the line interface unit 21 converts an analog signal applied from the line on the frame relay subscriber side into a digital signal and applies it to the framer 22 side, and the framer 22. ) Extracts the TDM signal from the signal applied from the line interface unit 21 and outputs the TDM signal to the HDLC processor 23. At this time, the HDLC processor 23 converts the TDM signal applied from the framer 22 into a packet. After converting and outputting the packet to the CPU 24 through the local bus, the CPU 24 processes the packet applied from the HDLC processor 23 and outputs the packet to the SAR processing unit 25 side. The packet applied from 24) is divided, matched with UTOPIA, and output to the backboard 27 side of the ATM switch.

In the case of transmitting a signal to the frame relay subscriber side, when the SAR processing unit 25 reassembles and divides the divided packet applied to the UTOPIA from the backboard 27 and outputs it to the CPU 24 side, the CPU 24 outputs the SAR processing unit. The packet applied from 25 is processed and output to the HDLC processor 23, whereby the HDLC processor 23 converts the packet applied from the CPU 24 via the local bus into a TDM signal to the framer 22 side. Framer 22 outputs the TDM signal from the HDLC processor 23 to the line interface unit 21, and the line interface unit 21 outputs the digital signal from the framer 22. Is converted into an analog signal and output to the line side of the frame relay subscriber.

As described above, in the present invention, by providing both the frame relay subscriber board and the ATM subscriber board in one circuit board, the present invention can be used as a frame relay subscriber board or an ATM subscriber board as needed, thereby improving economic efficiency.

Claims (1)

A line interface unit for converting a signal received from the line into a digital signal and converting a signal transmitted to the line side into an analog signal; A framer for extracting a TDM signal by removing a frame from the signal input from the line interface unit, and framing the TDM signal output to the line interface unit; An HDLC processor for converting a TDM signal input from the framer into a packet and converting a packet output to the framer side into a TDM signal; A CPU for processing packets input and output to the HDLC processor; Splitting the packet applied through the CPU from the HDLC processor to match it with UTOPIA and output it to the backboard side of the ATM exchanger A SAR processing unit; ATM physical layer which extracts ATM cell from TDM signal applied from the framer, matches it to UTOPIA and outputs it to the backboard side, converts ATM cell matched to UTOPIA from the backboard and converts it into TDM signal and outputs it to the framer side A frame relay / ATM subscriber mixing circuit board in an AT switch, characterized in that it comprises a processing unit.