JPH0946395A - Terminal adapter with backup function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit fault information on an active line to the pocket pager that a maintenance person carries, to simplify the transmission means of fault information, and at the same time, to enable a quick transmission. SOLUTION: When the data signal from a DTE 1 is normally connected with the side of an exclusive line 5 an a line fault is detected in an exclusive line interface circuit 22, a switch control circuit 25 performs a pocket pager connection instruction for a pocket pager connection circuit 26 at first, performs a connection with a prescribed pocket pager for an INS line and transmits a fault notification message. Next, the switch control circuit 25 instructs an INS interface circuit 23 to connect with an opposite TA side and instructs a switch circuit 24 to switch the line to the INS line on the side of a backup after the connection processing is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter with a backup function, and more particularly to a terminal adapter with a backup function having a function of notifying a network management device or the like of information when a line failure has occurred and when the line has been restored.

[0002]

2. Description of the Related Art Conventionally, a terminal adapter with a backup function of this type uses a dedicated line as an active transmission line and an INS line as a backup transmission line as a transmission line to be connected, and an interface for connecting a terminal device and these lines. In addition to the function, it has a switching function that switches to the INS line when the current dedicated line fails.

The information about the line failure is notified to the network management device located in the central office, and the transmission route of this information is as shown in FIG. 3, for example. FIG. 3 is a block diagram showing a transmission route of fault information transmitted from a conventional terminal adapter.

In FIG. 3, the terminal adapter TA1
2 has the above-mentioned function and interfaces the data signal from the terminal device DTA11 and constantly sends it to the partner DTE11 via the dedicated line 14. When the TA 12 monitors the leased line 14 and detects a failure, the INS line 1
3 is connected to the other party's TA 12 and the current dedicated line is switched to this INS line to continue communication.

At this time, the failure information is TA1 of either one of them.
2 is transmitted to the network management device 18 through the analog public line 16 via the modem and MODEM 15.
The network management device 18 receives this failure information, issues an alarm and informs the maintenance person, and then takes action for recovery.

[0006]

As described above, since the conventional terminal adapter transmits the fault information to the network management device through the modem using the public line or the like, a line for this transmission is required. In addition, since the network management device is away from the terminal adapter that has detected the failure, there is a problem that it is not possible to quickly respond to the recovery.

[0007]

The terminal adapter with backup function of the present invention is an interface for connecting to the notification terminal device side line, the dedicated line of the working transmission line and the INS line of the backup transmission line in advance when the state changes. And the dedicated line are monitored to detect a failure, I
In a terminal adapter with a backup function, which comprises a switching unit for performing a connection process with an opposite side to an NS line and switching the dedicated line to the INS line, the switching unit has the INS line before the connection process with the opposite side. On the other hand, a pager connection processing circuit for transmitting a predetermined DTMF signal for connecting to a pager and transmitting a communication text, and a notification table for holding the notification text.

Further, the pager connection processing circuit is
After the failure of the dedicated line is recovered and the INS line is switched back to the dedicated line, a connection process may be performed again with respect to the pager to send a notification text.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the terminal adapter in FIG.

In FIG. 1, the terminal adapter TA2
Interfaces the data signal from the terminal device DTE1 and always transmits this data signal to the partner TA2 side via the dedicated line 5 for use. When a failure occurs in the leased line 5, TA2 sets the transmission line to the backup transmission line IN
It is designed to switch to the S line 4.

On the other hand, the INS line 4 is connected to the analog public line 6 between the exchanges 8 and 9 and can also be connected to the pager 7. When TA2 detects a failure of the leased line 5, before connecting the INS line 4 to the partner TA2 side, the connection process to the pager 7 side is first performed, the failure information is transmitted to the pager 7, and then the other party. The connection is processed on the TA2 side to switch the line.

Next, the configuration and operation of TA2 will be described with reference to FIG. A terminal interface circuit 21 for transmitting and receiving data signals to and from the DTE 1 side; a dedicated line interface circuit 22 for monitoring the dedicated line 5 and outputting fault information when a fault is detected and transmitting and receiving data signals;
An INS interface circuit 23 for connecting and disconnecting the NS line 4 to and from the partner TA2 and transmitting and receiving a data signal;
Always connect the DTE1 side data signal to the leased line 5 side,
Switching circuit 24 connected to the INS line 4 side by a switching signal
A pager connection circuit 26 that connects the INS line 4 to a predetermined pager by a pager connection signal and transmits a predetermined communication amount; and a communication table 27 that holds the communication amount.
It comprises a pager connection signal, a connection signal to the partner TA, and a switching control circuit for outputting a switching signal according to the failure information from the leased line interface circuit 22.

Next, the operation will be described. In the normal state, the switching circuit 24 is in a state of connecting the signal of the leased line interface circuit 22 and the signal of the terminal interface circuit 21. The switching control circuit 25 constantly monitors the failure information of the leased line interface circuit 22 and, when an abnormality or the like occurs in the leased line 5, first instructs the pager connection circuit 26 to connect to a pager.

The pager connection circuit 26 sends a predetermined pager call signal through the INS line interface circuit 23 to perform connection processing, and after connection, the notification table 2
The notification text preset in 7 is acquired, converted into a DTMF tone, and transmitted.

After the completion of the pager notification, the switching control circuit 25 instructs the INS line interface circuit 23 to perform the connection process for the partner TA, and after the connection is completed, the switching circuit 24 opens the line. It is instructed to switch from the dedicated line interface circuit 22 side to the INS line interface circuit 23 side.

In the notification table 27, for example, a sentence for notifying an occurrence event such as "Soutinikirikae" is set in advance.

In addition, the line from the INS line 4 to the dedicated line 5
When switching back to the side, the switching control circuit 25
4 is instructed to switch the line back to the dedicated line interface circuit 5 side. Further, after the switching back is completed, the pager connection circuit 26 is instructed to connect to the pager, and the pager connection circuit 26 sends out a notification sentence such as "Popularity" after the connection.

It should be noted that the pager is carried by the maintenance person, and the maintenance person receives the call and knows the location of the faulty line from the notification text and immediately starts the fault recovery.

[0019]

As described above, the terminal adapter with backup function according to the present invention uses the existing pager service to notify the contents of the failure, and therefore, the line and management device for transmitting the failure information are provided. The cost of network management can be reduced without need. In addition, since the pager is used, it is possible to notify the maintenance person of the occurrence of the failure promptly, so that there is an effect that the failure can be quickly recovered.

[Brief description of drawings]

FIG. 1 is a block diagram of a system showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a terminal adapter in FIG.

FIG. 3 is a block diagram showing a conventional system.

[Explanation of symbols]

 1 Terminal Equipment (DTE) 2 Terminal Adapter (TA) 4 INS Line 5 Private Line 6 Analog Public Line 7 Pager 8 INS Switch 9 Analog Public Line Switch 21 Terminal Interface Circuit 22 Private Line Interface Circuit 23 INS Interface Circuit 24 Switching Circuit 25 Switching control circuit 26 Pager connection circuit 27 Notification table

Claims (2)

[Claims] 1. An interface unit for connecting respectively to a terminal device side line, a dedicated line of a working transmission line and an INS line of a backup transmission line, and a partner for the INS line when the dedicated line is monitored and a failure is detected. In a terminal adapter with a backup function, which comprises a switching unit for performing connection processing with the other side and switching the dedicated line to the INS line, the switching unit switches to the pager for the INS line before the connection processing with the other party. 2. A terminal adapter with a backup function, comprising: a pager connection processing circuit for sending a predetermined DTMF signal for transmitting the connection processing and communication text, and a notification table for holding the notification text. 2. The pager connection processing circuit, after the failure of the leased line is restored and the INS line is switched back to the leased line, reconnects to the pager and sends a notification sentence. The terminal adapter with backup function according to claim 1.