JPS615654A - Initial setting system of digital line terminator - Google Patents

Abstract

PURPOSE:To revise automatically the operating mode without interrupting power supply by providing a means for detecting a dial-enable signal or an incoming signal transmitted from a digital exchange to apply initial setting. CONSTITUTION:When a dial-enable signal is returned via a digital subscriber line SL, a signal detection circuit DET detects the dial-enable signal received by a transmission/reception circuit TR2 and inputs a detection signal (d) to a terminal NMI of a processor PU. The processor PU receiving the signal (d) starts the initial setting processing and applies initial setting to a transmission/reception circuit TR1 based on operating mode (m) set in a buffer memory BM. Then when an incoming signal is transmitted via the subscriber line SL in case of the incoming to the terminal DTE, the circuit DET detects the incoming signal received by the circuit TR2 and inputs the signal (d) to the terminal NMI of the processor PU. The processor PU applies initial setting to the circuit TR1 or the like based on the preset operating mode information (m).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the initial setting method of a digital line termination device for accommodating a digital data terminal in a digital exchange.

This type of digital data terminal is connected to the digital subscriber line via a digital line termination device. Note that digital data terminals have various data transmission speeds or data formats. Therefore, the digital line termination device needs to switch its operating mode depending on the performance of the digital data terminal it accommodates.

[Conventional technology]

FIG. 2 is a diagram showing an example of an initial setting method for a conventional digital line termination device. In FIG. 2, a digital line termination device DCE connects a digital data terminal DTE and a digital subscriber line SL. Operation mode information m corresponding to the accommodated digital data terminal DT is preset in the digital line termination device DCE. When the digital line termination device DCE is powered on in such a state, the power-on reset signal p is input to the power-on reset terminal POR of the processor PU.

As a result, the processor PU starts an initial setting process, and initializes the transmitting/receiving circuit TRI for transmitting and receiving digital data to and from the digital data terminal DT and other components based on the preset operation mode information 91m. As a result, the digital line termination device DCE starts operating in an operation mode suitable for the digital data terminal DT it accommodates.

[Problem to be Solved by the Invention 1] As is clear from the above explanation, in the conventional initial setting method of a digital line termination device, when the digital line termination device is turned on, it does not respond to the operation mode information input in advance. It was set by default.

Therefore, if the format of the digital data terminal to be accommodated changes and the operating mode of the digital line termination equipment must be changed, first turn off the power to the digital line termination equipment, input the new operation mode information, and then The power had to be turned on again, and the digital line termination equipment had to be shut down.

One way to solve this problem is to add a function to the processor that periodically monitors the operating mode information set in the buffer memory, and when it detects that the operating mode information has been updated, automatically Reinitialization is also considered, but such a solution would require extra functionality on the processor.

[Means for Solving the Problems] The present invention provides a digital line termination device for accommodating a digital data terminal in a digital exchange, which includes detection means for detecting a dialable signal or an incoming call signal transmitted from the digital exchange. The above-mentioned problem is solved by providing a processor whose initial setting processing is started by the detecting means, and by performing the initial setting of the digital line termination device by the processor.

[Effect]

According to the present invention, when a dialable signal is returned from the digital exchange via the digital subscriber line, and when an incoming call signal is transmitted from the digital exchange via the digital subscriber line, the processor Since the operating mode of the digital line termination device is initialized, there is no need to temporarily cut off the power to change the operating mode, and there is no need to add a function to the processor to monitor updates of operating mode information. Moreover, the load hardly increases.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 is a diagram showing an initial setting method of a black digital line termination device according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 3, a signal detection circuit DET that detects a dialable signal or an incoming call signal transmitted from a digital exchange via a digital subscriber line SL is connected to a digital line termination device DCE.
It is located inside.

In FIG. 1, when a call is made from the digital data terminal DTE, when a dialable signal is returned from the digital exchange via the digital subscriber line SL, the signal detection circuit DET detects the dialable signal received by the transmitter/receiver circuit TR2. is detected, and a detection signal d is input to the non-maskable included terminal NMI of the processor PU. The processor PU that has received the detection signal d starts an initial setting process and initializes the transmitter/receiver circuit TRI and others based on the operation mode information m set in the buffer memory BM.

Next, when an incoming call signal is transmitted to the digital data terminal DTE from the digital exchange via the digital subscriber line SL, the signal detection circuit DET detects the signal from the transmitter/receiver circuit T.
R2 detects the received call signal and inputs the detection signal □ signal d to the non-maskable included terminal NMI of the processor PU. The processor PU that has received the detection signal d initializes the transmitter/receiver circuit TRI and others based on the preset operation mode information m, as described above.

As is clear from the above description, according to this embodiment, the digital line termination device DCE is set in advance when a dialable signal or an incoming call signal is transmitted from the digital exchange via the digital subscriber line SL. Since the initial settings are made based on the operation mode information m, if you change the operation mode information m to be set, the initial settings will be automatically made based on the new operation mode information @m the next time a call is made or received. be done. 'Of course, no new functions are added to the processor PTJ, and the load on the processor PU hardly increases.

Note that FIG. 1 is merely one embodiment of the present invention, and for example, the configuration of the digital line termination device DCE is not limited to that shown in the figure, and many other modifications may be considered. In either case, the effects of the present invention remain the same.

〔Effect of the invention〕

As described above, according to the present invention, in the digital line termination device, the operation mode can be automatically updated without cutting off the power supply or adding new functions, and the operation mode can be updated automatically. Therefore, there is almost no increase in load, and the operability of the digital line termination device is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an initial setting method of a digital line terminating device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of an initial setting method of a conventional digital line terminating device. In the figure, d is a detection signal, DCE is a digital line termination device, DET is a signal detection circuit, DTE is a digital data terminal, m is operation mode information, MEM is a memory, and NM
I is a non-maskable included terminal, p is a power-on reset signal, P. R is a power-on reset terminal, SL is a digital subscriber line, and TRI and TR2 are transmitting/receiving circuits.

Claims (1)

[Claims] A digital line termination device for accommodating a digital data terminal in a digital exchange includes a detection means for detecting a dialable signal or an incoming call signal transmitted from the digital exchange, and a processor whose initial setting processing is activated by the detection means. 1. An initial setting method for a digital line terminating device, characterized in that the digital line terminating device is initialized by the processor.