JP2832352B2 - In-band signal equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an in-voice signal device.

(Prior Art) As a system using an in-band signal device (IBR), a system shown in FIG. 2 is conventionally known.

The system shown in FIG. 1 includes two exchanges 100 and 101 constituting a communication network, two in-band signal devices 103 and 104 interposed between the respective exchanges 100 and 101, and each of these in-band signals. A dedicated line 105 for connecting the devices 103 and 104 to each other.

Then, at the time of no call, that is, at the time of dialing, at the time of incoming call, at the time other than busy, the output of the signal SS from the switch which stops the call operation, for example, the switch 100, is stopped, and The in-band signal device 103 generates an in-band signal and transmits the in-band signal to the other in-band signal device via the dedicated line 105.
Send to 104. As a result, signal SR is output from this in-band signal device 104 to notify the other exchange 101 that the call operation of exchange 100 has been completed.

Further, when starting the call operation from this state, the switch that performs the call, for example, switch 100, outputs signal SS, and stops the output of the in-band signal from in-band signal device 103. As a result, the other in-band signaling device 104 stops outputting the signal SR and notifies the exchange 101 corresponding to the in-band signaling device 104 of the start of the call operation. As a result, the output of the signal SS from the exchange 101 is started, and the exchanges 100 and 101 can communicate with each other.

Thereafter, if the voice signal 4WS is output from the exchange 100,
This is the path from the in-band signal device 103 to the one line of the dedicated line 105 → the in-band signal device 104.
The signal is supplied to the exchange 101 as an audio signal 4WR. When the voice signal 4WS is output from the exchange 101, it is supplied to the exchange 100 through the route of the in-voice signal device 104 → the other line of the dedicated line 105 → the in-voice signal device 103 → the exchange 100. .

By the way, in such a conventional in-band signal device, when each of the exchanges 100 and 101 is in a call, no in-band signal is output from each of the in-band signal devices 103 and 104. However, there is a problem that it is difficult to detect a call failure due to disconnection due to being determined as a call state.

(Object of the Invention) In view of the above circumstances, the present invention provides an in-voice signal device capable of detecting an alarm and issuing an alarm when a communication line between the in-voice signal devices is disconnected. The purpose is.

(Summary of the Invention) In order to solve the above-mentioned problems, in the in-voice signal device according to the present invention, a state in which a signal SR indicating that an in-band signal is received from the in-voice signal device main body is not output. When the predetermined time has elapsed, it is determined that an abnormality such as disconnection has occurred.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of a signal apparatus in a voice band according to the present invention.

The in-band signal device 1 shown in FIG.
The state of the signal unit 4 in the audio band inserted between the dedicated line 3 and the signal input / output to / from the signal unit 4 in the audio band is monitored, and if there is an abnormality, this is notified. An abnormality detection circuit 5 is provided.

The in-band signal device main body 4 is configured to receive the in-band signal source
, A switch 7, buffer amplifiers 8 and 9, and an in-band detector 10, which are capable of outputting various signals output from the exchange 2 and various signals supplied via the dedicated line 3. The call mode is set based on the call mode or the non-call mode based on the call mode.

The switch 7 takes in the in-band signal output from the in-band signal source 6 when the signal SS is being output from the exchange 2 and supplies it to the buffer amplifier 8.

When the in-band signal is supplied from the switch 7, the buffer amplifier 8 takes in the
Send up. When the in-band signal is not supplied from the switch 7, the voice signal 4WS output from the exchange 2 is fetched and transmitted on the dedicated line 3.

Further, the buffer amplifier 9 takes in the signal supplied through the dedicated line 3 and supplies it to the in-band detector 10 or supplies it to the exchange 2 as a voice signal 4WR.

The in-band detector 10 is connected to the buffer amplifier 9
If the signal supplied from is an in-band signal, the signal is detected to generate a signal SR, which is supplied to the exchange 2.

Further, the abnormality detection circuit 5 includes an AND gate 11 for calculating a logical product of a signal input to the switch 7 and an output of the in-band detector 10, and a "1" signal (2 A timer 12 which detects when a value logic level "1" signal is output and generates an alarm signal by detecting this, a signal SS is output from the exchange 2, and the dedicated line 3 When an in-band signal is not supplied via the terminal (this state includes a call state) for a predetermined period of time, an alarm signal indicating that the dedicated line 3 has been disconnected is generated. It is supplied to a buzzer line (not shown).

Thus, in this embodiment, the signal from the exchange 2 is
When SS is output and no in-band signal is supplied via the dedicated line 3 for a predetermined period of time, it is determined that the dedicated line 3 has been disconnected and an alarm signal is generated. Therefore, when the leased line 3 is disconnected, it can be detected and recovered at an early stage.

In the above-described embodiment, the signal SS output from the exchange 2 is monitored, but only the in-band signal supplied via the dedicated line 3 may be monitored. In this case, when the in-band signal is not supplied for a predetermined time, that is, when the communication state is abnormally long, it is determined that the dedicated line 3 is disconnected, an alarm signal is generated, and a buzzer or the like sounds.

(Effects of the Invention) As described above, according to the present invention, when a communication line between signal devices in each audio band is disconnected, this can be detected and an alarm can be issued.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an in-band signal apparatus according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional in-band signal apparatus. DESCRIPTION OF SYMBOLS 1 ... In-band signal device, 2 ... Switch, 4 ... In-band signal device main body, 5 ... Judgment circuit (abnormality detection circuit).

Claims (1)

(57) [Claims] An in-band signal device connected to one end of a dedicated line outputs a signal SR indicating that an in-band signal has been received from the in-band signal device connected to the other end of the dedicated line. An in-band signal device comprising: a determination circuit that determines that an abnormality has occurred in the leased line and outputs an alarm when the state has not continued for a predetermined time.