JPH0470034A - Subscriber's private network test system - Google Patents

Abstract

PURPOSE:To attain an effective test of an UP transmission channel of a subscriber's private network in an on-line state by transmitting a test cell to the UP transmission channel of the network having a loop-shaped bus constitution after multiplexing the test cell and comparing a transmitted test signal with an untransmitted test signal after separating the test cell from the UP transmission channel. CONSTITUTION:A subscriber's private network consists of a loop-shaped bus, and a test cell including a test signal and an identifier showing the identity of a test cell is produced. Then a transmission signal that multiplexed the test cell is sent to an UP transmission signal that multiplexed the test cell is sent to an up transmission channel of the network. Meanwhile the test cell is detected out of the transmission signal of the UP transmission channel and a test signal is separated from the test cell. This separated test signal is compared with the test signal of a test cell generating means 19. Thus the subscriber's private network can be effectively tested without interrupting a normal communication state.

Description

[Detailed Description of the Invention] [Summary] Regarding a home line test method for testing a home network connected to a subscriber network in asynchronous transfer mode, the test can be performed without interrupting the normal communication state and is efficient. The purpose of this test is to provide a home line test method that tests a home network connected to a network termination device of an asynchronous transfer mode subscriber network. a test cell generation means for generating a test cell including a test signal and an identifier indicating that the cell is a test cell; 1 multiplexing means;
a first separation means for detecting a test cell from a transmission signal of an uplink transmission channel of the home network and separating the test cells; and a test signal separated by the first separation means for testing the test cell generation means. the network terminating device includes a comparison means for comparing the transmission signal with the transmission signal of the subscriber network, and detects an empty cell in the transmission signal of the downlink transmission channel of the subscriber network, and multiplexes the test cell at the empty cell position. a second multiplexing means for transmitting to the downlink transmission channel of the home network; a second separation means for detecting the test cell from the transmission signal of the downlink transmission channel of the home network and separating the test cells; The network termination device has a comparison means for comparing the test signal separated by the separation means with the test signal of the test cell generation means, and the comparison means compares the test signal of the ratio test cell with the test signal of the test cell generation means. Configure to check the health of the home network.

[Industrial application field]

The present invention relates to a home line test method, and more particularly, to a home line test method for testing a home network connected to an asynchronous transfer mode subscriber network.

A plurality of terminals are connected to a home network connected to a network terminal (NT) of the network, and it is necessary to test this home network as well.

[Conventional technology]

In conventional digital networks and l5DN (Integrated Service Digital Network), synchronous transfer mode (ST) is used as an information transfer mode.
When testing such a home network in synchronous transfer mode, the transmission channel of the network has a constant speed, so the test was conducted in an offline state with the normal communication state canceled.

[Problem to be solved by the invention]

Broadband I5DNs, which are currently being constructed, are scheduled to use asynchronous transfer mode (ATM) as an information transfer mode.

Is it possible to test the home network of such asynchronous transfer motes in an offline state as in the past?In this case, there was a problem that communication would have to be interrupted.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a home line test method that allows testing to be performed without interrupting the normal communication state and allows for efficient testing.

[Means to solve the problem]

The home line test method of the present invention is a home line test method for testing a home network connected to a network termination device of a subscriber network in asynchronous transfer mode, in which the home network is configured with a loop bus, and test signals and test A test cell generating means for generating a test cell including an identifier indicating that it is a cell; a first multiplexing means for sending a transmission signal in which the test cells are multiplexed to an upstream transmission channel of the home network; A first separating means detects a test cell from a transmission signal of an uplink transmission channel and separates the test cell from a test signal of the test cell; and a test cell generating means separates the test signal from the first separating means. The network termination device has comparison means for comparing with the test signal.

Further, a second multiplexing means detects an empty cell in the transmission signal of the downlink transmission channel of the subscriber network, multiplexes the test cell at the empty cell position, and sends it to the downlink transmission channel of the home network; a second separation means for detecting test cells from the transmission signal of the downlink transmission channel and separating the test cells; and a comparison for comparing the test signal separated by the second separation means with the test signal of the test cell generation means. and means in the network terminating device.

[Effect]

In the present invention, test cells are multiplexed and sent out on an uplink transmission channel of a home network having a loop bus configuration, and the test cells are separated from the uplink transmission channel of this home network and the test signals before and after transmission are compared. , it is possible to efficiently test the upstream transmission channel of the home network in an online state.

In addition, test cells are multiplexed at vacant cell positions and sent to the downlink transmission channel of the home network, and the test cells are separated from the downlink transmission channel of the home network and the test signals before and after transmission are compared. Downlink transmission channels can be efficiently tested online.

〔Example〕

FIG. 1 shows a block diagram of an embodiment of a network termination device to which the system of the present invention is applied.

In the figure, an upstream transmission end 11a of an interface unit 11 on the inside of a network terminal (NT) 10 is shown.

11b, the downlink transmitting end 11c, and the lid, an ATM terminal 12. ~12° are connected in a loop. In other words, the home network has a loop bus configuration.

The interface section 14 on the subscriber network side is connected to an ATM subscriber network such as a broadband 15DN.

Here, the internal configuration of an ATM transmission channel is shown in FIG.

In the figure, a frame signal F is inserted at regular intervals, and following the frame signal F, a plurality of ATM cells S are arranged. There is a header part H at the beginning of each ATM cell, followed by an information field DF, and the header part H
Inside is +11 when the cell is in use and I when it is unused.
Busy bit BUSY which becomes O' and identifier I of each cell
D is provided.

The frame signal output section 15 in the network termination device 10 generates a transmission signal with the busy bit BUSY of each cell S set to 10' using the ATV transmission channel configuration shown in FIG. 2, and supplies it to the test signal multiplexing section 16. In addition, the test signal generation/comparison unit 17 generates a cell with the BUSY set to 111, the identifier ID set to a value indicating a test cell, and the information field DF set as a test signal of a test pattern, and calculates the actual communication capacity (speed). The signal is supplied to the test signal multiplexing section 16 in a smaller capacity than that of the test signal multiplexing section 16, and the test signal multiplexing section 16 multiplexes it into a transmission signal as shown in FIG. In FIG. 3, a cell with a busy node BUSY of '0' is called an empty cell, and a cell with an identifier -D or a value indicating a test cell is called a test cell.

The transmission signal shown in FIG. 3 is sent out from the home network upstream channel output terminal 11a of the interface section 11, and
M terminal 12. ~12. is supplied to the terminal 11b of the interface section 11 through the test signal detection/separation section 1.
8.

Each of the ATM terminals 12+ to 12.degree. transmits the test cell of the transmission signal as it is without performing any processing to prevent the test signal in the information field DF from being modified.

The test signal detection/separation unit 18 separates the test cell with the value indicating the identifier ID or the test cell, and supplies the test signal in the information field DF to the test signal generation/comparison unit 17. Compare whether the pattern of the separated test signal is a test pattern or not. When the pattern of the separated test signal is different from the test pattern, the alarm generation section 19 puts the alarm signal into the information field, an alarm cell with an alarm identifier is generated, and the alarm multiplexing section 20 detects and separates the test signal. The test cell is multiplexed with the alarm cell in the vacant cell in the separated transmission signal by the section 18. This transmission signal is sent from the terminal 14a of the interface section 14 to the uplink transmission channel of the subscriber network.

The downlink channel of the subscriber network entering the terminal 14b of the interface section 14 is supplied to the empty cell detection section 21 through the interface section 14, where it is detected whether the busy bit BUSY in the transmission signal is 10' or an empty cell. The test signal multiplexing section 22 multiplexes the test cell from the test signal generating/comparing section I7 onto the detected empty cell to produce a transmission signal as shown in FIG. This transmission signal is sent out from the home network downstream channel output terminal 11c of the interface unit 11, and is sent from the ATM terminal 124~]2. The signal is then supplied to the terminal 11 (l) of the interface section II, from where it is supplied to the test signal detection/separation section 23.

The test signal detection/separation section 23 separates the test cell having the identifier ID or the value indicating the test cell, and supplies the test signal in the information field DF to the test signal generation/comparison section 17 . The test signal generation/comparison unit 17 compares whether the pattern is the separated test signal pattern or the test pattern in the same way as when testing the home network upstream transmission channel, and if they are different, the alarm generation unit 19 and alarm multiplexing unit 20 Alarm cells are generated, multiplexed onto vacant cells, and sent to the uplink transmission channel of the subscriber network.

In this way, test cells are multiplexed and sent out on the upstream transmission channel of a home network with a looped bus configuration, and the test cells are separated from the upstream transmission channel of this home network and the test signals before and after transmission are compared. Uplink transmission channels of a home network can be efficiently tested online.

In addition, the test cells are multiplexed at vacant cell positions and sent to the downlink transmission channel of the home network, and the test cells are separated from the downlink transmission channel of the home network and the test signals before and after transmission are compared. The downlink transmission channel can be tested online and efficiently.

〔Effect of the invention〕

As mentioned above, according to the in-house line test method of the present invention, it is possible to conduct a test without interrupting the normal communication state.
It allows efficient testing and is extremely useful in practice.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of a network termination device according to the present invention, Fig. 2 is a diagram showing an ATM transmission channel configuration, and Fig. 3 is a diagram showing a transmission channel configuration at an uplink NT transmitting end of a home network. FIG. 4 is a diagram showing the transmission channel configuration at the NT transmitting end in the downlink direction of the home network. 21-12. , is an ATM terminal, 5 is a frame signal output section, 6.22 is a test signal multiplexing section, 7 is a test signal generation/comparison section, 8.23 is a test signal detection/separation section, 9 is an alarm generation section, 20 is an alarm A multiplexing section 21 indicates an empty cell detection section. Patent Applicant: Fujitsu Limited In the figure, 10 is a network termination device, 11.14 is an interface section, Figure 2 shows the internal configuration of the transmission channel of ATV.

Claims (2)

[Claims] (1) Network termination equipment (10
) In the home network test method that tests a home network connected to means (17); first multiplexing means (16) for transmitting a transmission signal in which the test cells are multiplexed to an uplink transmission channel of the home network; a first separating means (18) that detects the test signal of the test cell and separates the test cell; and the first separating means (18).
The test signal separated by the test cell generating means (17)
The network terminating device (10) has a comparison means (17) for comparing the test signal with the test signal, and the normality of the home network is confirmed by a match in the comparison means (17). Net test method. (2) Network terminal equipment (10
) In the home network test method that tests a home network connected to means (17); a second means for detecting an empty cell in a transmission signal of a downlink transmission channel of the subscriber network, multiplexing a test cell at the position of the empty cell, and transmitting the test cell to the downlink transmission channel of the home network; multiplexing means (21, 22); second separating means (23) for detecting a test cell from the transmission signal of the downlink transmission channel of the home network and separating the test cell from the test signal of the test cell; The second separation means (23)
The test signal separated by the test cell generating means (17)
The network terminating device (10) has a comparison means (17) for comparing the test signal with the test signal, and the normality of the home network is confirmed by a match in the comparison means (17). Net test method.