JPH0433185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital subscriber line testing method that enables transmission testing of control signals from a digital terminal device.

Via the recently digitized subscriber line,
2. Description of the Related Art Digital home equipment in which one or more digital terminal devices are accommodated at a line termination section is being put into practical use.

In such digital home equipment, the digital terminal equipment has a plurality of communication channels (hereinafter referred to as B channels) for transmitting and receiving voice or data signals between the digital terminal equipment and the line termination unit via the subscriber line, and communication channels for exchange connections, etc. It includes a control signal transmission channel and a control signal reception channel (hereinafter referred to as D channel) for transmitting and receiving control signals.

In this type of digital home equipment, there is a strong need to realize a means that allows the digital terminal equipment to test the normality of various control signals transmitted and received via the subscriber line between the digital terminal equipment and the line termination section. requested.

[Conventional technology]

Figure 3 is a diagram showing an example of a conventional digital terminal device, and Figures 4a and 4b are diagrams showing an example of a conventional digital terminal device.
FIG. 2 is a diagram showing an example of a signal format transmitted through a subscriber line in the figure.

In FIG. 3, a digital terminal device 1 is composed of a signal processing section 2, a line interface section 3, and a communication path section 4, and is housed in a line termination section 6 via a digital subscriber line 5. Although the line termination section 6 can accommodate a plurality of digital terminal devices 1 via the digital subscriber line 5, only one is shown in FIG. 3, and the others are omitted.

The communication path section 4 is connected to the line interface section 3 through two sets of B channels (B1 channel and B2 channel), and the voice transmitted from the handset 41 is digitally encoded by a communication circuit 42 and a code/decoder section 43, and then sent to a selector. The digitally encoded audio transmitted to one of the B channels selected by the selector 44 and received from the B channel is decoded into an analog format via the selector 44, the code/decoder 43, and the communication circuit 42, and then transmitted/received. The information is transmitted to the device 41. Further, the selector 44 can also select a B channel through which data signals transmitted and received by the data terminal 45 attached thereto are transmitted to the line interface section 3.

On the other hand, the signal processing unit 2 is connected to the line interface unit 3 by a set of D channels consisting of a control signal transmission channel (hereinafter referred to as Du channel) and a control signal reception channel (hereinafter referred to as Dd channel). Sends and receives various control signals for exchange control via the channel.

The line interface unit 3 connects the communication path unit 4 to B.
The voice or data signals transmitted through the 1 and B2 channels and the control signal transmitted from the signal processing section 2 through the Du channel are synthesized by the frame disassembly and assembly section 31 into a frame format as shown in FIG. The data is transmitted to the line termination section 6 via the public line 5.

The line termination section 6 transmits voice or data signals and control signals to be transmitted to the digital terminal device 1 via the digital subscriber line 5 through a B1 or B2 channel as shown in FIG. 4b, and a Dd channel. At the same time, the control signal transmitted from the digital terminal device 1 via the D channel is returned as an echo control signal and sent back through the echo control signal channel (hereinafter referred to as the E channel) as shown in FIG. 4b. do.

The line interface section 3 receives a fourth signal transmitted from the line termination section 6 via the digital subscriber line 5.
Various channels of the format shown in FIG.
The control signal is transmitted to the signal processing unit 2 via the D channel.

In addition, the line interface unit 3 compares the echo control signal transmitted via the E channel with the control signal transmitted from the signal processing unit 2 via the Du channel by the D channel monitoring unit 32, and matches the echo control signal transmitted via the E channel with the control signal transmitted via the Du channel. This confirms that the control signal sent via the Du channel was definitely transmitted to the line termination unit 6, and if it does not match, it is determined that the control signal was not transmitted to the line termination unit 6 via the Du channel. The comparison result is transmitted to the signal processing section 2.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in a conventional digital terminal device, the control signal sent from the signal processing unit 2 is sent via the line interface unit 3 and the digital subscriber line 5 to the line termination unit 6 via the Du channel. The echo control signal is transmitted from the line termination unit 6 via the digital subscriber line 5 to the line interface unit 3 via the E channel, and is monitored by the D channel monitoring unit 32. However, the D channel monitoring unit 32
Conflicts channel transmission with other digital terminal devices connected to the same bus (when multiple digital terminal devices start D channel transmission at the same timing) is controlled at the layer 1 level. It does not check the D channel frame, but only checks bit by bit. Therefore, the D channel monitoring section 32
Therefore, it is not possible to test the normality of the D channel frame. The present invention switches the signal line of the D channel signal and sends the echo control signal back to the signal processing section, thereby using the D channel reception processing of the signal processing section as it is, and controlling the terminal regarding the transmission and reception of the D channel frame. We are trying to realize a digital subscriber line test method that tests the normality and normality of the line.

[Means for solving problems]

The present invention solves the above problems by taking the following measures.

That is, in the present invention, for example, when the power is turned on, the signal processing section transmits a test mode signal to the line interface section in order to perform a control signal transmission/reception test.

When the line interface unit receives the test mode signal from the signal processing unit, it enables the echo control signal transmitted from the line termination unit via the E channel to be transmitted to the signal processing unit via the Dd channel.

When a control signal is sent from the signal processing section through the Du channel in such a state, the control signal is transmitted to the line termination section 6 via the line interface section 3 and the digital subscriber line 5, and is echoed from the line termination section 6. A control signal is sent to the line interface unit 3 via the digital subscriber line 5 via the E channel.
The line interface section 3 is sent back to Dd.
The signal is sent back to the signal processing unit 2 via the channel.

[Effect]

That is, according to the present invention, the control signal sent from the signal processing section is transmitted to the line termination section and then returned to the signal processing section as an echo control signal, so that the signal processing section does not perform normal D channel reception processing. Through similar processing, it becomes possible to confirm that the control signal has been properly transmitted as a D channel frame to the line terminal, and it becomes possible to confirm the normality of the digital subscriber line from the digital terminal device. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a digital subscriber line test method according to an embodiment of the present invention, and FIG.
It is a figure which shows an example of the signal transmission and reception process for a test in a figure. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 1, a test mode signal T transmitted from the signal processing section 2 is transmitted into the line interface section 3, and a Dd channel and a A selector 33 for selecting an E channel is provided.

In FIG. 1, the communication path section 4 transmits and receives voice or data signals to and from the line interface section 3 via two sets of B channels, as in FIG. 3.

On the other hand, the line interface section 3 is connected to the signal processing section 2.
When the test mode signal T is not transmitted from the line termination section 6, the selector 33 selects the Dd channel transmitted from the line termination section 6 and connects it to the Dd channel leading to the signal processing section 2. In such a state, as in FIG. 3, the control signal transmitted by the Dd channel from the line termination section 6 via the digital subscriber line 5 is transmitted to the signal processing section 2 by the Dd channel, and The echo control signal transmitted by the E channel from the section 6 via the digital subscriber line 5 is compared with the control signal sent by the signal processing section 2 by the D channel monitoring section 32, and only the comparison result is sent to the signal processing section 2. is transmitted to.

1 and 2, when the digital terminal device 1 is powered on, the signal processing section 2 is set to a test mode and transmits a test mode signal T to the line interface section 3. In FIG. In the line interface section 3 that has received the test mode signal T, the selector 33 selects the E channel transmitted from the line termination section 6 and connects it to the Dd channel leading to the signal processing section 2.

Next, the signal processing section 2 sends a calling signal as a test control signal to the line interface section 3 through the Du channel. Line interface section 3
transmits the calling signal transmitted from the signal processing unit 2 to the line termination unit 6 via the digital subscriber line 5 and the Du channel. The line termination unit 6 receives the calling signal transmitted from the line interface unit 3 through the Du channel and connects the digital terminal device 1
At the same time, the calling signal is transmitted as an echo control signal to the line interface section 3 via the digital subscriber line 5 and the E channel. The line interface section 3 transmits the echo control signal transmitted from the E channel, that is, the calling signal, to the signal processing section 2 via the Dd channel via the selector 33.

The signal processing section 2 receives signals from the line interface section 3.
The reverberation control signal transmitted by the Dd channel,
It is compared with the calling signal previously sent to the line interface unit 3 through the control channel Du, and if they match, it is determined that the calling signal has been reliably transmitted to the line termination unit 6, and a disconnection signal is sent through the Du channel. ,
End test mode and set normal operation mode. The line interface section 3 transmits the disconnection signal transmitted from the signal processing section 2 to the digital subscriber line 5.
is transmitted to the line termination section 6 via the Du channel. The line termination unit 6 that received the disconnection signal,
The call set by the previously received calling signal is released.

As is clear from the above description, according to this embodiment, the signal processing unit 2 set to the test mode when the power is turned on transmits the test mode signal T to the line interface unit 3, thereby transmitting the test mode signal T to the line termination unit. 6
From E, the echo control signal returned by the present invention is made receivable by the signal processing section 2 through processing similar to normal D channel reception processing, and sent to the line termination section 6 via the line interface section 3. Since the signal can be sent back and received as an echo control signal, testing of the subscriber line can be performed from the digital terminal device 1.

Note that FIGS. 1 and 2 are only one embodiment of the present invention, and for example, the control signal sent by the signal processing unit 2 for testing is not limited to the calling signal, and may be used in many other ways. Although the following modifications are considered, the effects of the present invention remain unchanged in either case. Further, the configurations of the line interface section 3 and the communication path section 4 are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention will not change in any case.

〔Effect of the invention〕

As described above, according to the present invention, in the digital terminal device, the control signal sent from the signal processing section is transmitted to the line termination section, and then returned to the interface section as an echo control signal, and is normally used for the Dd channel. By switching the signal line to be received using a selector and sending the echo control signal back to the signal processing section in the same way as the D channel signal, the signal processing section performs the same processing as normal D channel reception processing.
It becomes possible to confirm that the control signal has been normally transmitted as a D channel frame to the line terminal, and it becomes possible to easily confirm the normality of the digital subscriber line from the digital terminal device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a digital subscriber line test method according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of the test signal transmission and reception process in FIG. 1, and FIG.
The figure shows an example of a conventional digital terminal device, and FIGS. 4a and 4b are diagrams showing an example of the signal format transmitted through the subscriber line in FIG. In the figure, 1 is a digital terminal device, 2 is a signal processing unit, 3 is a line interface unit, 4 is a communication path unit, 5 is a digital subscriber line, 6 is a line termination unit, 31 is a frame disassembly unit, and 32 is a D channel monitoring section, 33 and 44 are selectors, 41 is a handset, 42 is a communication circuit, 43 is a code decoding section, 45
is a data terminal, B1 and B2 are channels for transmitting and receiving voice or data signals, Du is a channel for transmitting control signals, Dd is a channel for receiving control signals, E is a channel for echo control signals, T is a test mode signal,
shows.

Claims (1)

[Scope of Claims] 1. A signal processing unit and a line interface unit are provided, and the signal processing unit connects a control signal transmission channel and a control signal reception unit to a line termination unit via the line interface unit. In the digital terminal device, the line interface unit has an echo control signal channel for receiving an echo control signal sent back from the line termination unit, wherein the line interface unit receives an echo control signal sent back from the line termination unit. When a test mode signal is received, an echo control signal transmitted from the line termination section via the echo control signal channel is transmitted to the signal processing section via the control signal receiving channel, and the echo control signal is transmitted to the signal processing section via the control signal receiving channel. A digital subscriber line testing method characterized by testing the normality in the processing section.