JP2592866B2 - Modem - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a modulation / demodulation device used for various data transmission systems.

(Prior Art) In recent years, as networks have expanded, the reliability of online data transmission has become an important issue. Therefore, the modem used for data transmission,
There is a tendency to use a network management system modem (hereinafter referred to as a modem with NMS) with a network monitoring function for monitoring the line quality and interface signal, and managing and controlling a remote modem. This NMS-equipped modem is provided with a monitoring channel for transmitting monitoring data, separately from a data channel for online data transmission. Using this monitoring channel, the center can monitor the status of the remote modem with NMS, perform test control, set the soft strap (set various operating parameters of the modem with NMS), and monitor the line quality at the center. Etc. can be realized.

FIG. 3 shows a data transmission system using this modem with NMS. In the figure, 41 is provided on the center side
A CPU 42 is a modem with an NMS on the center side, and 46 is an NMS controller. A terminal 45 and a modem with NMS 44 are provided on the remote side. Modem 42 with NMS and NMS modem 44
Transmits and receives a modulated signal connected by the dedicated line 43. The CPU 41 is connected to the modem 42 with NMS.
A terminal 45 is connected to the modem with S 44, and the CPU 41 and the terminal 45 eventually perform data transmission via the NMS modem 42, the dedicated line 43, and the modem with NMS 44. An NMS controller 46 is connected to the NMS-equipped modem 42. The NMS controller 46 can perform monitoring data collection, test control, and soft strap setting using a monitoring channel.

However, the NMS-equipped modems 42 and 44 are configured to transmit / receive monitoring / control data related to transmission by only one line via a monitoring channel. For this reason, if data transmission via the one line (the dedicated line 43 in FIG. 3) becomes impossible for some reason, the monitoring channel uses the dedicated line 43 and the monitoring data is collected. become unable. Therefore, in this state, even if the center side tries to grasp the cause of the data transmission failure, the cause of the failure cannot be specified because the monitoring data cannot be obtained, and it takes a long time to recover. The problem has arisen.

(Problems to be Solved by the Invention) As described above, according to the conventional modulation / demodulation apparatus, the monitoring data is collected using the monitoring channel via one line, and therefore, the monitoring data is collected via the line. If all data transmission becomes impossible for some reason, monitoring data cannot be collected, the cause of the failure cannot be specified, and a long time is required for recovery.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional modem, and an object of the present invention is to accurately monitor the status of the modem of the partner station even when data transmission by one line becomes impossible. An object of the present invention is to provide a modem capable of collecting data, thereby easily identifying the cause of a failure, and not requiring much time for recovery.

[Configuration of the Invention] (Means for Solving the Problems) In the present invention, a CPU or a terminal is connected and connected to a partner modem via a first line, and the data of the first rotation is transmitted. A data channel modem unit that modulates and demodulates data transmitted and received between the CPU or terminal and a CPU or terminal connected to the other party's modem via a channel, and a monitoring channel of the first line. A modem having a monitoring channel modem unit for performing data modulation and demodulation for performing supervisory control on the partner modem, a second line for the partner modem and a second line
And a spare interface for connection via a line modem, and a modem controller with a network monitoring function for obtaining monitoring data of the state of the other party's modem and displaying a display based on the data on a display unit. Monitoring the state of the data transmission performed via the interface on the controller side of the first line and the first line;
If it is detected that data transmission is possible via the line, the monitoring control for the partner modem is performed via the monitoring channel modem and the first line, and the first line is When it is detected that data transmission is impossible through the backup interface, a call can be made between the backup interface and the modem for the second line and the other modem through the second line, Monitoring data relating to the state of the other party's modem via the modem for the second line and the second line, and giving it to the modem controller with network monitoring function which performs the monitoring data via the controller side interface. And a control unit that enables display.

(Operation) According to the above configuration, when data transmission by the first line becomes impossible, a spare interface is used, and monitoring data can be accurately collected via the second line,
The fault location can be specified using this.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a modulation / demodulation device according to an embodiment of the present invention.
It is the modem 1 with S. The NMS-equipped modem 1 has a terminal 7 connected to a dedicated line as a first line, an interface 5 connected to a DTE (data terminal equipment) such as a terminal or a CPU, and monitoring data of the state of a modem at a partner station. An interface 9 connected to an NMS controller for obtaining and transmitting control data and the like, and a spare interface 12 connected to a telephone line as a second line are provided. 2 switches the path of a signal transmitted / received through each interface and terminal, controls the state of data transmission performed through a line connected to the terminal 7, and performs data transmission through the line. If the monitoring channel modem unit 4 detects that
While monitoring data is collected via the above, when it is detected that data transmission via the above-mentioned line is impossible, the monitoring data collection path is switched to the spare interface 12 side to collect the monitoring data. Actually, for example, it is constituted by a data error check circuit, a relay, a relay control section, etc., and when a data error is detected by the data error check circuit, a signal is given to the relay control circuit to switch the relay. A data channel modem unit 3 and a monitoring channel modem unit 4 are provided between the control unit 2 and the terminal 7. The data channel modem 3 is connected to a partner station via a line connected to the terminal 7, and modulates and demodulates data transmitted to and from a device (terminal, CPU, etc.) of the partner station. The monitoring channel modem unit 4 is connected to a partner station via a line connected to the terminal 7, and transmits and receives monitoring / control data related to data transmission to and from the modem of the partner station. FIG. 2 shows the configuration of a data transmission system using such a modem 1 with an NMS.

In FIG. 2, reference numerals 22 and 24 denote modems with NMS having the same configuration as the modem 1 with NMS shown in FIG. CPU 21 and NMS controller 26 are connected to modem 22 with NMS, and terminal 25 is connected to modem 24 with NMS. During normal operation, the CPU 21 and the terminal 25 transmit and receive data via the data channel modem units of the modems 22 and 24 with NMS. Also, the NMS controller 26
It is possible to monitor the status of the NMS-equipped modem 24, perform test control, and set a soft strap via the monitoring channel modem unit of the attached modem 22. In this embodiment, the modems 22 and 24 with NMS
Are connected to full-duplex modems 27 and 29 with NCUs, respectively, and are connected by telephone lines 28 including an exchange network between the full-duplex modems 27 and 29. With this configuration, the control unit of the modem 22 with NMS (FIG. 1)
Monitors the status of data transmission over the dedicated line 23,
If it detects that data transmission is possible,
When data transmission is continued using the data channel modem unit (FIG. 1) and the monitoring channel modem unit (FIG. 4), and it is detected that data transmission becomes impossible, the standby interface (FIG. 12) is used. ) Sends a signal to the full-duplex modem 27 to call the NMS modem 24 at the remote station to enable communication via the telephone line 28. The monitoring data on the status of the modem 24 with NMS is collected through the line 29 and the full-duplex modem 27, and the collected monitoring data is supplied to the NMS controller 26 via the interface 9. Here, the monitoring data includes NMS
Various interface signals handled by the attached modem 24, status line state data, and the like are included, and these data are displayed on a display unit (not shown) of the NMS controller 26. It is possible to identify whether the cause of the data transmission failure is any of the dedicated line 23, the modem 24 with NMS, and the terminal 25.

In this embodiment, a dedicated line and a telephone line are used, but the present invention is not limited to the type of line. Further, although a full-duplex modem is used by being externally connected to the spare interface, the modem need not be full-duplex, and the modem may be built in the modem.

[Effects of the Invention] As described above, according to the present invention, when data transmission by the first line is impossible via the backup interface using the second line, the state of the modem on the other side is determined. Monitoring data can be accurately collected, the location of the failure can be identified without requiring much time, and the recovery can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
FIG. 3 is a block diagram of a data transmission system using one embodiment of the figure, and FIG. 3 is a block diagram of a data transmission system using a conventional modem. 1,22,24 Modem with NMS 2 Control unit 3 Data channel modem unit 4 Monitor channel modem unit 5 9 Interface 7 Terminal 12 Reserved interface 21 CPU , 23… Dedicated line 25… Terminal, 26… NMS controller 27, 29… Full-duplex modem 28… Telephone line

Claims (1)

(57) [Claims] A first terminal connected to a CPU or a terminal;
Connected to the other party's modem via the line of
A data channel modem unit that modulates and demodulates data transmitted and received between the CPU or terminal and the CPU or terminal connected to the other party's modem via the data channel of the line, and monitors the first line. A monitoring channel modem unit for modulating and demodulating data for monitoring and controlling the partner modem via a channel, wherein a second line and a second line are provided for the partner modem. And a controller for connecting a modem controller with a network monitoring function for obtaining monitoring data of the state of the partner modem and displaying on the display unit based on the monitoring data. Monitoring the state of data transmission performed via the first line and the first line If it is detected that data transmission is possible, the supervisory control is performed on the partner modem via the supervisory channel modem and the first line, while the data is transmitted via the first line. When it is detected that transmission is impossible, a call can be made between the spare interface and the modem for the second line and the other modem through the second line, and the spare interface and the second line can be communicated. Data collected via the modem and the second line for monitoring the status of the other modem, and can be provided to the modem controller with network monitoring function for performing the monitored data via the controller interface and displayed. A modulation / demodulation device comprising: