JPH0530130A - Inter-terminal line test system through atm network - Google Patents

Abstract

PURPOSE:To easily recognize transmission between terminals by providing a test cell generation circuit on one terminal and a recognition cell transmission circuit on the other terminal and transmitting a test cell and a recognition cell from the respective circuits. CONSTITUTION:When the test cell generation circuit 12 is driven by the instruction of a control part 10, the circuit 12 generates the test cell, and the test cell is transmitted from the insertion circuit 11 of the transmission-side terminal 1 to the reception-side terminal 3 through an ATM network 2. The test cell is detected in a test cell detection circuit 31 and is informed to a control part 30, whereby the recognition cell transmission circuit 32 is driven. The recognition cell generated in the circuit 32 is supplied from an insertion circuit 33 to a transmission line and it is transmitted in the intervals of data cells transmitted to the terminal 1. When the terminal 1 detects the recognition cell in the recognition cell detection circuit 13, it recognizes that the test cell is transmitted to the terminal 3. Thus, transmission between the terminals 1 and 3 of the ATM network 2 can easily be recognized and the reliability of data and serviceability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal line test system through an ATM network. 2. Description of the Related Art In recent years, research on ATM has been actively pursued as a communication method for realizing wideband ISDN. In ATM, the goal is to achieve high speed, and in the background of improving the reliability of transmission technology such as LSI and optical fiber, sequence management of the retransmission procedure is not adopted.

[0002]

2. Description of the Related Art When data is transmitted by a cell between two terminals communicating via an ATM network, the sequence management function of the retransmission procedure used in the conventional communication system is speeded up and the network is highly reliable. It has been eliminated due to its nature, and the protocol has been greatly simplified compared to conventional packet transmission. Therefore, when data is transmitted / received by a cell between two terminals communicating via an ATM network, it is not possible to transmit / receive a delivery confirmation procedure such as the conventional packet transmission between the terminals in a transmission unit (each cell). ..

However, in data communication, for example, in information processing by a computer, confirmation of delivery between terminals is indispensable, and some means must be provided. Specifically, there are various data generated in the financial system.

As a method therefor, it is conceivable to incorporate a sequence management function and a resending means in the upper layer (between user users) of the conventional ATM protocol, and its realization is under study.

[0005]

The method of incorporating the sequence management function and the retransmitting means in the upper layer described above means that the sequence management and the retransmitting procedure are added to the normal data transmission / reception procedure, and the normal processing (data (Send / receive processing)
There is a problem that processing becomes complicated because management of failure processing procedures is mixed.

It is an object of the present invention to provide an inter-terminal line test system via an ATM network which enables confirmation of delivery between terminals by the ATM layer without complicating the processing of the terminals.

[0007]

FIG. 1 illustrates the principle of the present invention. In FIG. 1, 1 is a sending side terminal and 2 is an ATM
A network, 3 represents a receiving side terminal. At the sending terminal 1, 1
Reference numeral 0 is a control unit, 11 is an insertion circuit, 12 is a test cell generation circuit, 13 is a confirmation cell detection circuit, and in the receiving side terminal 30, 30 is a control unit, 31 is a test cell detection circuit, 32 is a confirmation cell transmission circuit, Reference numeral 33 is an insertion circuit.

According to the present invention, when one of the two terminals connected via ATM transmits a test cell indicating a test between normal data cells to the other terminal, the other terminal detects the test cell together with the data cell. Then, the confirmation cell, which means reception of the test cell, is sent back to one terminal (source). By detecting this with one terminal, it is determined that the transmitted data has been delivered to the other party.

[0009]

When the sending side terminal 1 and the receiving side terminal 3 are connected via the ATM network 2, when it is desired to confirm that the data sent from the sending side terminal 1 is received by the receiving side terminal 3 of the other party. , The test cell generation circuit 12 is driven according to an instruction from the control unit 10. As a result, the test cell generation circuit 12 generates a test cell and sends it from the insertion circuit 11 to the ATM network 2.

This test cell has the same structure as a normal ATM cell (a header has 5 octets and an information field has 48 octets, for a total of 53 octets), but the information indicating that the test cell is a header or information field. Is set to any of.

The ATM cell output from the ATM network 2 is input to the receiving side terminal 3. The test cell therein is detected by the test cell detection line 31 and notified to the control unit 30. Then, the control unit 30 drives the confirmation cell transmission circuit 32. The confirmation cell transmission circuit 32 generates a cell in which information indicating the confirmation cell is set in a part of the header or the information field in advance, and the insertion circuit 33 outputs the A
It is supplied to the transmission path toward the TM network 2. This confirmation cell is also transmitted between the data cells transmitted from the receiving side terminal 3 to the transmitting side terminal 1.

When the transmission side terminal 1 detects the confirmation cell detection line 13 in the cell transmitted from the ATM network 2, it notifies the control unit 10. As a result, the control unit 10 can confirm that the transmitted test cell has been transmitted to the partner terminal. If the confirmation cell cannot be detected, it is determined that a failure has occurred in the transmission line and the network. In that case,
It performs processing such as disconnecting the call, re-calling after disconnecting the call to make a new connection, and re-calling the switching route.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 2 is a block diagram of an embodiment of a terminal, and FIG. 3 is a block diagram of the arrangement of cells sent to the network and the configuration of test cells and confirmation cells.

In FIG. 2, 4 is a terminal, 40 is a control unit composed of a microprocessor (μP), 41-1 is an interface (I / F) of a data input device such as a keyboard.
A circuit 41-2 is an I / O with a data output device such as a display device.
F circuit, 42 is a cell generation circuit, 43-1 and 43-2 are voice input, analog-digital conversion circuit (A /
D), 44-1 and 44-2 are digital / analog conversion circuits (D / A) for outputting analog signals to the image display device and the audio output device, 45 is a cell disassembly / assembly section, 46 is a cell assembly circuit, and 47 is The multiplexing unit (MUX), 48 is a distribution unit (DM
UX), 49 is an insertion circuit, 50 is a test cell generation circuit, 5
1 is a confirmation cell transmission circuit, 52 is a confirmation cell detection circuit, 53
Is a test cell detection circuit.

In this terminal 4, data such as a keyboard is I / O
When input from the F circuit 41-1, a cell is generated in the cell generation circuit 42 under the control of the control unit 40 and is input to the multiplexing unit 47. Further, communication using voice and images (using a camera) as other media is possible for this terminal 4, and when voice signals and image signals from the cameras are input as analog signals, A / Ds 43-1, 43 At -2, the signals are converted into digital signals and input to the cell disassembling / assembling unit 45, disassembled into cells and supplied to the multiplexing unit 47.
Audio and video signal data are multiplexed and sent to the network.

The backward ATM cells transmitted from the partner terminal to the terminal 4 via the network are distributed to the respective types by the distribution unit 48, and the data is stored in the cell assembling circuit 46 and the I / F 41-.
The audio and image cells are output via the cell disassembly / assembly unit 45 and converted into analog signals by the D / A's 44-1 and 44-2 and output as audio signals and image signals.

When performing a test, when the control unit 40 gives an instruction to the test cell generation circuit 50 to transmit the test cell during the transmission of the data cell (or periodically), the test cell is generated and the insertion circuit 49 is generated. To the network.

The other terminal also has the configuration shown in FIG.
The test cell detection circuit 53 monitors the test cell from the transmission line input from the network, and when the test cell is detected, the control unit 40 is notified. As a result, when the control unit 40 of the partner terminal issues an instruction to the confirmation cell transmission circuit 51, the confirmation cell is transmitted to the network via the insertion circuit 49 between the data cells.

In the source terminal, the confirmation cell detection circuit 52 monitors cells from the network, and when the confirmation cell is detected, the control unit 40 is notified. This completes the test procedure of test cell generation and confirmation cell detection. If the confirmation cell does not return, this process is repeated, and if it is determined that the confirmation cell does not return in the same manner, processing such as call disconnection, re-call by the same route, and re-call by the switching route is executed.

The arrangement of cells transmitted from the terminal is shown by A in FIG. Data, data such as voice (actual data)
When there is no data cell to transmit, the test cell is inserted and transmitted. The test cell and the confirmation cell are B. As shown in, part (2) of the header (5 octets) of the cell
(Bit required) is assigned to the display of the test cell and the confirmation cell, or a part of the information field (48 octets) is similarly assigned to the display of the test cell and the confirmation cell.

[0021]

According to the present invention, it is possible to easily confirm the delivery between terminals of an ATM network and improve the reliability and serviceability of data. Furthermore, by using the terminal function as in the present invention, normal processing and failure processing (test operation) can be separated, and promotion of function sharing and simplification of processing can be achieved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram of an embodiment of a terminal.

FIG. 3 is a diagram showing the arrangement of cells sent to the network and the configuration of test cells and confirmation cells.

[Explanation of symbols]

 1 Transmitting Terminal 2 ATM Network 3 Receiving Terminal 10 Control Unit 11 Insertion Circuit 12 Test Cell Generation Circuit 13 Confirmation Cell Detection Circuit 30 Control Unit 31 Test Cell Detection Circuit 32 Confirmation Cell Transmission Circuit 33 Insertion Circuit

Claims (1)

Claim: What is claimed is: 1. In a terminal-to-terminal line test method via an ATM network, a test cell including a test display is sent from a test cell generation circuit from one of two terminals connected via the ATM network. When a test cell is generated and the test cell is generated, the test cell generation circuit transmits the test cell to the other terminal. When the other terminal detects the test cell, the confirmation cell including a display indicating reception of the test cell is transmitted as the confirmation cell. An inter-terminal line test method via an ATM network, characterized in that transmission is identified from the circuit to the one terminal, and the one terminal detects the confirmation cell to identify the delivery confirmation.