JP3542925B2 - Modem remote reset system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a remote reset system for a modem on a switched line that automatically resets a terminal by sending a reset signal in response to a reset request from a host.
[0002]
[Prior art]
With the development of personal computer communication and the like, communication with a host computer or the like via a communication network is frequently performed. As communication becomes more frequent, more and more obstacles to new information communication devices have been observed. Modem devices are no exception, and there are many obstacles such as not responding to the ring tone.
[0003]
To solve this problem, an example of a conventional control method using a modem is disclosed in Japanese Patent Application Laid-Open No. Hei 7-212489. The modem control device described in this publication automatically detects a failure when the modem does not respond to a call signal and automatically recovers from the failure. The configuration of this modem control device consists of a branching unit for branching the line between the switching network and the switching modem, and monitoring the line branched from the branching unit, and when there is an incoming call, detecting the number of ringers to the switching modem side. A fault occurrence detecting means for determining whether or not there is a fault, and a reset means for resetting and recovering the exchange modem side when a fault occurs in the fault occurrence detecting means. When there is an incoming call from the calling side through the switching network, the modem control unit monitors the ringer by the fault occurrence detecting means. When there is a fault on the exchange modem side, the modem controller resets. Thus, the failure can be recovered.
[0004]
[Problems to be solved by the invention]
In addition, many data network systems using conventional analog exchange lines are used. A common example of this system is “communication karaoke”.
[0005]
It is desirable for this system to have a function to request the terminal side to initialize (reset) the terminal side system when the terminal is abnormal, but the remote reset method used in the current system is There is a method of transmitting a reset request command when data communication is established, and the terminal modem that receives this command resets the system.However, in this method, the terminal modem functions normally. Is a prerequisite, and there is no guarantee that the modem will function properly in situations that require a system reset.
[0006]
Therefore, a method of resetting the system in response to the request from the host is required regardless of the state of the terminal system.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a remote reset system for a modem which performs a reset by transmitting a reset signal via a switching line when a reset request from a host is requested from a host.
[0008]
[Means for Solving the Problems]
A remote reset system for a modem according to the present invention includes a network capable of outputting a single tone as a reset signal from a host to a line of a target terminal in response to a request from the host, and resetting the terminal system. A terminal modem connected to the network via the switch, monitoring the switched line and detecting a single tone signal from the network, receiving the reset signal and receiving the reset signal to a terminal device, the network comprising: A host transmitting a reset signal and a line performing reset to the terminal device; a host modem transmitting a reset signal transmitted from the host and transmitting the reset signal; and a host modem transmitting the reset signal. having a an exchange for outputting a single tone serving as the reset signal line of the terminal to the object It is characterized in.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The configuration of the embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a diagram illustrating a system configuration according to an embodiment of the present invention. FIG. 2 is a diagram showing a remote reset circuit according to the present invention.
[0010]
For a terminal modem in a data network system using a general switched line, a terminal modem 10 provided with a reset request signal detection circuit independent of the function of the modem, and a request from the host for the terminal modem 10 And a network 12 that outputs a single tone as a reset signal to a line (telephone number) of a target terminal and can reset the terminal system in response to a request from the host.
[0011]
The network 12 includes a host 14 for transmitting a reset signal and a line for resetting to a terminal, a host modem 16 for calling a line for resetting and transmitting a reset signal, and a line (telephone number) for a target terminal. ) And an exchange 18 for outputting a single tone as a reset signal.
[0012]
The terminal modem 10 interfaces the received signal to the connected terminal device 20.
[0013]
The configuration of the terminal modem 10 is such that it is connected to the modem unit 22 and a LINE (switched line), constantly monitors, detects a single tone signal serving as a reset request signal output from the switch 18 in response to a request from the host, A remote reset circuit 24 for determining whether the single tone signal is a reset request signal from the host side.
[0014]
The remote reset circuit 24 receives a tone detection circuit 26 for detecting a single tone signal serving as a reset request signal output from the exchange in response to a request from the host side, and a single tone signal input from the tone detection circuit 26. And a timer circuit 28 for determining whether or not the single tone signal is a reset request signal from the host side to determine whether the tone is a continuous tone for a predetermined time.
[0015]
Therefore, when a data network system using a switched line is constructed, when the present invention is applied, a reset request is issued from the host side to the terminal side system irrespective of the operation of the terminal side modem. The advantage is that it can be done.
[0016]
In FIG. 1, a host modem 16 calls a switch 18 for a reset request and a line (telephone number) of a terminal device 20 requesting the reset. Here, the method of the reset request is arbitrary, but for example, a method of continuously inputting # or * by DTMF after the telephone number is considered. The exchange 18, which has received a reset request from the host and information on the line to be reset, outputs a single tone as a reset request signal to the requested line for a certain period of time.
[0017]
The input side of the tone detection circuit 26 is connected in parallel with the modem on a LINE (switched line). It should be noted here that the input impedance of the tone detection circuit 26 is sufficiently high with respect to the 600Ω termination of LINE. The design of the tone detection circuit 26 is arbitrary as long as it can detect a single tone in a frequency band of 0.3 to 4.3 kHz, but tone detection is always performed while a target tone is detected. It is necessary to design to turn on the signal.
[0018]
The tone detection circuit 26 constantly monitors the waveform on the LINE, turns on the tone detection signal when a tone having the same frequency as the predetermined reset request signal is detected, and notifies the timer circuit 28 at the subsequent stage. The timer circuit 28 monitors the tone detection signal input from the tone detection circuit 26. When the tone detection signal is turned on, and when the tone detection signal is continuously turned on for a predetermined period of time, the timer circuit 28 Outputs reset signal.
[0019]
Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is a timing chart of the operation of the remote reset circuit of the present invention. When the host 14 calls the telephone number and a reset request signal for the terminal to be reset to the exchange 18, the exchange 18 transmits a single tone of a predetermined frequency to the line of the requested terminal. Outgoing. When a tone of a predetermined frequency is detected on the LINE of (a), the tone detection signal (b) is turned on. When the tone detection signal of (b) is turned on, the timer circuit 28 starts the operation, and when the tone detection signal is on continuously for a predetermined period of time t, the timer circuit 28 sends a signal to the terminal device 20. To output a reset signal. The terminal device 20 resets itself according to the reset signal input from the timer circuit 28, and the initialization of the system is completed.
[0020]
Next, another embodiment of the present invention will be described. The basic configuration is as described above. However, the reset request signal output from the exchange 18 is changed to a single tone, and any one of 16 types of DTMF tones 0 to 9, A to D, #, and * is used. A setting method is also possible. If the frequency of the DTMF tone is used for the reset request signal, a commercially available DTMF detection IC can be used for the tone detection circuit 26, and the circuit can be configured at lower cost.
[0021]
【The invention's effect】
The remote reset system for a modem according to the present invention makes it possible to reset a terminal system from a host in a data network system using a switched line. This leads to an improvement in maintainability under the current situation where the terminal device is often unattended on the data network, and can further contribute to an improvement in the operation rate of the network.
[0022]
Further, in this system, by providing a remote reset circuit in the terminal modem, it is possible to obtain a reset request from the host side to the terminal side system irrespective of the operation of the terminal side modem. Can be
[Brief description of the drawings]
FIG. 1 is a diagram showing a system configuration according to an embodiment of the present invention.
FIG. 2 is a diagram showing a remote reset circuit according to the present invention.
FIG. 3 is a timing chart of the operation of the remote reset circuit of the present invention.
[Explanation of symbols]
10 Terminal Modem 12 Network 14 Host 16 Host Modem 18 Switch 20 Terminal Equipment 22 Modem Unit 24 Remote Reset Circuit 26 Tone Detection Circuit 28 Timer Circuit

Claims (5)

A network that can output a single tone as a reset signal from the host to a target terminal line at the request of the host, and reset the terminal system;
A terminal modem connected to the network through a switched line, monitoring the switched line and detecting a single tone signal from the network, receiving the reset signal and receiving the reset signal to a terminal device ,
The network is
A host transmitting the reset signal and a line for resetting to the terminal device;
A host modem for calling a line for performing the reset transmitted from the host and transmitting the reset signal;
An exchange for outputting a single tone serving as the reset signal transmitted from the host modem to a line of the target terminal;
Modem remote reset system characterized by Rukoto to have a. The terminal modem is
Upon detection of a reset request signal monitoring single tone communications are call through the exchange, No placement claim 1 Symbol characterized by having a remote reset circuit for outputting said reset signal to said terminal device Remote reset system for modem. The remote reset circuit,
A tone detection circuit for detecting the single tone;
Determine whether the detected single tone is not another signal by measuring the detection time of the single tone, and when the single tone is the reset request signal, send the reset signal to the terminal device. A timer circuit to output,
The remote reset system for a modem according to claim 2, further comprising: Modem remote reset system according to claim 1, wherein, characterized in that said single tone in DTMF tones. The timing of the output of the reset signal, the beyond the detection time of a single tone, the modem remote reset system according to claim 2 or 3, wherein the single tone is after completion.

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