JPS61239729A - Test system for digital subscriber line - Google Patents

Abstract

PURPOSE:To confirm the normalcy of a digital subscriber line from a digital terminal device by transmitting a control signal which is sent out of a signal processing circuit to a circuit termination part and then returning it as an echo control signal to the signal processing part. CONSTITUTION:When the digital terminal device 1 is powered on, the signal processing part 2 is set in test mode and a test mode signal T is sent to a circuit interface part 3. The circuit interface part 3 receiving the signal T selects an E channel for an echo control signal sent from the circuit termination part 6 by a selector 33 and connects it to a Dd channel for control signal reception extending to the signal processing part 2. Then, the signal processing part 2 transmits a calling signal as a control signal for a test to the circuit termination part 6 through a Du channel for control signal transmission, the circuit interface part 3, and the digital subscriber line 5. The circuit termination part 6 sends this calling signal to the circuit interface part 3 over the E channel through the digital subscriber line 5 and the signal is further transmitted to the signal processing part 2 over the Dd channel through the selector 33.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a digital subscriber line test method that enables transmission tests of control signals from digital terminal equipment via subscriber lines that have been digitalized in recent years. Digital home equipment in which a plurality of 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
(referred to as a channel) and a system for transmitting and receiving control signals such as for exchange connections! It includes a channel for II signal transmission and a channel for control signal reception (hereinafter referred to as D channel).

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 sent and received via the subscriber line between the digital terminal equipment and the line termination section. requested.

[Conventional technology]

FIG. 3 is a diagram showing an example of a conventional digital terminal device, and FIG. 4! a) and FIG. 4) are diagrams showing an example of the signal format transmitted through the subscriber line in FIG. 3;

In FIG. 3, the digital terminal device 1 has 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 unit 4 has two sets of B channels (Bl channel and B
2 channels), and the voice transmitted from the handset 41 is digitally encoded by the communication circuit 42 and the code/decoder 43, and then sent to the selector 4.
The digitally encoded audio transmitted to one of the B channels selected by 4 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 the B channel through which data signals transmitted and received by the Q9 terminal 45 attached thereto are transmitted to the line interface unit 3.

On the other hand, the signal processing unit 2 uses a control signal transmission channel (hereinafter referred to as D
u channel) and control signal reception channel (referred to as
It is connected to the line interface unit 3 by a set of D channels (hereinafter referred to as Dd channels), and various control signals for switching control are transmitted and received via the D channels.

The line interface section 3 uses the frame disassembly and assembly section 31 to process the voice or data signals transmitted through the Bl and B2 channels from the communication path section 4 and the control signals transmitted through the Du channel from the signal processing section 2 as shown in FIG. It is synthesized into a frame format as shown in a) and sent to the digital subscriber line 5.
The signal is transmitted to the line termination section 6 via the.

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 to a Bl or B2 channel as shown in FIG. 4('b), and a Dd At the same time, the control signal transmitted from the digital terminal bag xi via the D channel is turned back as an echo control signal, and the echo control signal channel (hereinafter referred to as the E channel) as shown in FIG. (named)).

The line interface unit 3 uses a frame disassembly and assembly unit 31 to disassemble various channels in the format shown in FIG. Alternatively, it is transmitted to the communication path section 4 via the B2 channel.1. Further, the control signal is transmitted to the signal processing section 2 via the Dd channel.

In addition, the line interface section 3 compares the echo control signal transmitted via the E channel with the control signal transmitted from the signal processing section 2 via the Du channel using the D channel monitoring section 32, and determines if they match. For example, it is confirmed that the control signal transmitted via the Du channel has been reliably transmitted to the line termination unit 6, and if there is no failure, the control signal transmitted via the Du channel is not transmitted to the line termination unit 6. The comparison result is transmitted to the signal processing section 2.

(Problem to be Solved by the Invention 3) As is clear from the above explanation, in a conventional digital terminal device, the control signal sent from the signal processing section 2 is transmitted to the line interface section 3 and the digital subscriber line 5.
from the line terminal 6 to the line interface 3 via the digital subscriber line 5 to the echo side 2.
Although it is returned as a B signal, it is not sent back to the signal processing section 2, so it was not possible to test whether the control signal sent from the signal processing section 2 was reliably transmitted to the line termination section 6. .

Means for Solving Problem C] The present invention solves the above problem 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.

If a control signal is sent from the signal processing section through the Dd channel in such a state, the cough control signal will be transmitted to the line interface section 3.
and is transmitted to the line termination section 6 via the digital subscriber line 'll1A5, and is returned from the line termination section 6 as an echo control signal via the E channel to the line interface section 3 via the digital subscriber line 5, and further transmitted to the line interface section 3. The unit 3 sends the signal back to the signal processing unit 2 via the Dd 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 control signal is transmitted to the line termination section in the signal processing section. It becomes possible to check whether the digital subscriber line is normal or not 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 testing system according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the test signal transmission and reception process in FIG. 1. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 1, the test mode signal T transmitted from the signal processing section 2 causes the Dd channel and E transmitted from the line termination section 6 connected to the Dd channel leading to the signal processing section 2 to A selector 33 for selecting a 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, when the line interface section 3 does not receive the test mode signal T from the signal processing section 2, the line interface section 3 selects the Dd channel transmitted from the line termination section 6 by using the selector 3.3, and selects the Dd channel transmitted from the line termination section 6. Connect to a channel. In such a state, as in FIG.
The echo control signal transmitted from the line termination section 6 to the E channel via the digital subscriber line 5 is checked by the D channel monitoring section 32 against the control signal sent out by the signal processing section 2. Only the results are transmitted to the signal processing section 2.

1 and 2, when digital terminal device 1 is powered on, signal processing section 2 is set to test mode and transmits test mode signal T to 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 selects the D channel transmitted from the line termination section 6.
Connect to ci channel.

Next, the signal processing unit 2 sends a calling signal as a test control signal to the line interface unit 3 through the Du channel.The line interface unit 3 converts the calling signal transmitted from the signal processing unit 2 into a digital The line termination unit 6 receives the calling signal transmitted by the Du channel from the line interface unit 3 and transmits it to the line termination unit 6 via the subscriber line 5 via the Du channel.
0 line interface section 3 sets up the call issued by the user, and transmits the calling signal as an echo control signal to the line interface section 3 via the E channel via the digital subscriber line 5. The echo control signal, ie, the calling signal, is transmitted to the signal processing section 2 via the selector 33 through the Dd channel.

The signal processing unit 2 compares the echo control signal transmitted from the line interface unit 3 through the Dd channel with the calling signal previously sent to the line interface unit 3 via the control channel Du, and if they match, the calling signal is certain. The 0 line interface unit 3 determines that the signal has been transmitted to the line 88 end 6, sends a disconnection signal through the Du channel, terminates the test mode, and sets the normal operation mode.
The disconnection signal thus transmitted is transmitted via the digital subscriber line 5 to the line termination section 6 via the Du channel. The line termination section 6, which has received the disconnection signal, releases the call set by the previously received calling signal.

As is clear from the above description, according to this embodiment, the signal processing section 2 set to the test mode when the power is turned on transmits the test mode signal T to the line interface section 3, thereby transmitting the test mode signal T to the line termination section 6. The echo control signal sent back from the network via the E channel can be received by the signal processing section 2 through the Dd channel, and the calling signal sent to the line termination section 6 via the line interface section 3 can be returned and received as an echo control signal. Therefore, the subscriber line test can be executed from the digital terminal device l.

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. may be considered, but the effects of the present invention will not change in any case, and the configurations of the line interface section 3 and the communication path section 4 are not limited to those shown in the drawings, and may be modified in many other ways. Although variations are considered, the effects of the present invention do 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 signal processing section as an echo control signal, so that the control signal is controlled in the signal processing section. It becomes possible to confirm that the signal has been transmitted to the line '4IA terminal, and it becomes possible to confirm the normality of the digital subscriber line from the digital terminal "AK."

[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. 3 is a diagram showing a conventional digital terminal device. FIG. 4 (al and in FIG. 4) is a diagram showing an example of the signal format transmitted through the subscriber line in FIG. 3. 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/decoder, 45 is a data terminal, B1 and B2 are voice or data signal transmission/reception channels, Du is a control signal transmission channel , Dd is a control signal reception channel, E is an echo control signal channel, and T is a test mode signal. 1st concave 2nd concave

Claims (1)

[Claims] comprising a signal processing section and a line interface section, the signal processing section having a control signal transmission channel and a control signal reception channel between it and the line termination section via the line interface section; In the digital terminal device, the section includes an echo control signal channel for receiving an echo control signal sent back from the line termination section, when the line interface section receives a test mode signal from the signal processing section, the echo control signal is sent back from the line termination section. A digital subscriber line testing system characterized in that an echo control signal transmitted from the line termination section via a signal channel is transmitted to the signal processing section via the control signal reception channel.