JPS6349949B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing failure in recovery when a failure occurs when a manual hold line is connected via a transport device.

When connecting telephone exchanges via a carrier, a signal conversion device is required to interface between the carrier and the exchange.

FIG. 1 is a block diagram showing a connection relay system when connecting telephone exchanges via a transport device. In the figure, T1 and T2 are telephones connected to an originating telephone exchange EXCH1 and a terminating telephone exchange EXCH2, respectively. Each telephone exchange EXCH1, EXCH2 is connected to a line via interoffice connection trunks TRK1, TRK2, respectively. Further, MUX1 is a transmitting side carrier multiplex converter, and MUX2 is a receiving side carrier multiplexer converter, and these are connected to each other by a multiplex carrier line.

SC1 and SC2 are signal conversion devices, and are provided to interface between the telephone exchange EXCH1 on the calling side and the carrier multiplex converter MUX1, and between the carrier multiplex converter MUX2 and the telephone exchange EXCH2 on the receiving side, respectively. . This is because the signal format and connection format are different between the telephone exchange side and the transport device side.

In such a signal conversion device, generally,
Receipt of fault information from the transport device or the terminating telephone exchange requires a blocking signaling function to prevent new calls from arriving from the originating telephone exchange.

FIG. 2 is a circuit diagram showing a closed circuit system in a conventional signal conversion device. In the figure, SC is a signal converter, and VF is a VF (audio frequency) unit.
Each of them is provided from CH1 to CH24 or CH30. MUX is a transport multiplexing device,
ALM is an alarm monitoring device. The carrier multiplex converter MUX is composed of an encoder COD, a decoder DEC, and a multiplex converter circuit MU.

In Fig. 2, A is a loop monitoring relay that monitors whether the caller is on or off, a is the contact of relay A, ANS is the relay for receiving the callee's response signal and alarm signal, and ans is the contact of the relay ANS. , SIGREC is a control signal receiving circuit that receives the response signal from the destination station and the alarm signal of the transport device. AL is a relay for detecting trouble in the transport device, and operates normally and recovers when trouble occurs. al is the contact point of relay AL.

In Fig. 2, when an incoming call is generated at the signal conversion device SC by closing the loop on the communication line from the originating telephone exchange, relay A is activated and an incoming call is received from the control signal sending circuit SIGTRS via contact a and terminal M. A start signal is sent to the side. Further, dial pulse signals and the like are sent out in the same manner.

On the other hand, when a response signal is sent from the incoming telephone exchange, it is received by the control signal receiving circuit SIGREC, and the relay ANS is operated via the terminal E. This switches the contact ans to reverse the polarity of the power supply of the loop monitoring circuit of the communication path.
It sends earth air to the T line and battery voltage to the R line as a response signal. When the called party ends the call, the relay ANS is restored and the polarity of the loop monitoring circuit power is restored and T
The line is the battery voltage, and the R line is the earth energy.

When a blockage signal from the called party or an alarm signal from the carrier device is received via the E terminal during no call, the blockage signal can be sent to the originating telephone exchange in the same way as the response signal.

In this way, in conventional signal conversion devices, alarm signals caused by troubles occurring within the conveyance device are sent through the alarm monitoring device and the VF unit.
It was received separately on the E terminal of each channel.

However, in this case, the following problem occurs. In other words, if a problem occurs while the line passes through the signal converter, the alarm monitoring device
The ALM relay AL is restored, and an alarm signal is sent to the E terminal of each signal conversion device via contact al.
Operate each relay ANS. In this way, the alarm signal is processed in the same way as the response signal, and the polarity of the power supply on the line's power supply circuit is reversed to the originating telephone exchange, so that the T line becomes ground voltage and the R line becomes battery voltage. A signal is sent out.

For this reason, lines using the calling party recovery control method are released without being affected by this blocking signal, but lines using the last party recovery control method hold the line until both the calling party and the called party turn on. In other words, in the case of a manual hold line in which a circuit with a line reservation (manual hold) function is prepared in the originating telephone exchange, the above-mentioned blocking signal is the same as the manual hold control signal, so the manual hold circuit of the originating telephone exchange is is held while the occlusion signal is being sent.

Therefore, even if the caller turns on the telephone, the manual hold line will not be restored properly, and the caller will not be able to make another call. In addition, when an alarm signal is received before a response, this alarm signal is received via the E terminal in the same way as the response signal, so an erroneous response occurs even though the response has not yet been received, causing erroneous charges. .

The present invention aims to eliminate such drawbacks of the prior art, and its purpose is to generate a common system alarm for each system instead of receiving an alarm signal at the E terminal of each line when a transport device fails. It is an object of the present invention to provide a system for transmitting a blockage signal that prevents failure of recovery of a manual hold line and prevents new call incoming by receiving a signal from a carrier device on a separate line.

In order to achieve this objective, in the method for preventing failure in recovery in the event of a fault in a manual hold line of the present invention, a telephone exchange equipped with a circuit with a line hold function and a terminal equipment of a transport device are connected via a signal conversion device. In the manual hold line that is used for manual hold, a separate line is provided to receive an alarm signal based on a failure on the receiving side as a common system alarm signal for each arbitrary number of lines from the monitoring device in the transport device to the signal converter, and it is also sent to the signal converter. A common control signal processing circuit is provided for commonly processing control signals of the side and the receiving side, and upon reception of the common system alarm signal, the caller's hook-on and hook-off from the originating telephone exchange is controlled through the communication path of the signal conversion device. By cutting off the power supply to the loop monitoring circuit that monitors the status for each line or all at once in the pre-common control signal processing circuit, the caller can disconnect the line via the circuit equipped with the line hold function. It is characterized in that it is opened by the caller and then blocked for new calls from the originating telephone exchange.

Examples will be described below.

FIG. 3 is a circuit diagram showing the configuration of an embodiment of the method for preventing failure in recovery in the event of a failure in a manual hold line according to the present invention. In this figure, the same parts as in FIG. 2 are indicated by the same numbers, and A-
DECT is an electronic loop monitoring detector, DRV is a relay drive circuit, SC-COM is a signal converter common section, COM-CONT is a common control signal processing circuit,
G and BAT are power supply terminals to the loop monitoring circuit, and under normal conditions, earth air is supplied to the terminal G, and battery voltage is supplied to the terminal BAT.

In FIG. 3, the method of relaying the hook-on and off signals from the originating station to the terminating station and the relaying of the response signal or blockage signal from the terminating station to the originating station are performed by the common control signal processing circuit in the signal converter. COM−
Except that it is processed via CONT, it is sent to the opposite telephone exchange in the same way as a conventional signal conversion device. The electronic detector A-DECT detects an incoming call by closing the loop on the communication line by the originating telephone exchange, which activates the common control signal processing circuit COM-CONT via the corresponding M terminal. An activation signal is sent from the multiplex converter MU via the control signal multiplex converter SIG-MUX of the carrier multiplex converter MUX. Also, when a response signal is sent from the incoming telephone exchange, the control signal multiplex conversion circuit
Common control signal processing circuit COM- via SIG-MUX
CONT operates, and a signal is sent from the corresponding E terminal to the relay drive circuit DRV, which operates the relay ANS, switches the contact ans, and reverses the polarity of the power supply of the loop monitoring circuit of the communication path. .

When the signal conversion device SC is used for incoming calls, if a trouble occurs in the transport device, the detection relay AL of the alarm monitoring device ALM is restored,
The alarm signal is sent to the common part of the signal converter via contact al.
Received by relay ALM' of SC-COM. relay
Since ALM′ operates normally, it is restored by receiving an alarm signal. In this way, alarm signals are received for each system consisting of 24 channels or 30 channels.

When the relay ALM' is restored, the earth voltage and battery voltage applied to the terminals G and BAT through its contact alm' are cut off, and therefore each signal converter
Power supply to the loop monitoring circuit in the SC stops. In this way, the T line and the R line of each signal converter are made to have no potential, and the potential-free signals on the T and R lines are sent to the originating telephone exchange as a blocking signal in this system.

Calls are also disabled due to the generation of system alarm signals, so when the caller turns on the caller, the loop from the originating telephone exchange is released and recovery control begins, but the signal converter sends the T-line and R-line no potential. Since the blocking signal is being sent, the circuit with the line hold function in the originating telephone exchange releases the line without putting it on hold and prevents subsequent calls from the originating telephone exchange.

The signal converter SC is mostly composed of electronic circuits, and mainly uses ±5V, ±12V, and ±24VDC as its operating power supply. Therefore, the battery voltage, which is the main power source used in conventional signal converters, is reduced.
48VDC is only used in this case where it interfaces with the telephone exchange. Therefore-
The current consumption of 48VDC is very low, 24
For each channel or system unit of 30 channels, it is possible to supply power to the loop monitoring circuit of each signal converter through the contact alm' in the signal converter common section SC-COM.
Therefore, it has become possible to adopt the configuration shown in FIG.

In this way, in the system shown in Figure 3, the response signal and blocking signal from the called side are ultimately controlled in the same way as in the conventional case, but the alarm signal is controlled by the signal converter common section SC-COM. The loop supervisory circuit is controlled and sends a shutoff signal to the originating telephone exchange to turn off the power to the loop supervisory circuit. Unlike the conventional system, this blockage signal is not the same as the manual hold control signal, so when a trouble occurs with the carrier, the caller can press the button to put the line on hold like in the conventional system. Recovery without any problems. In addition, after recovery due to this blockage signal, new calls from the originating telephone exchange can be prevented. Furthermore, since the alarm signal and the response signal are separated, it is also possible to prevent the sending of an erroneous response signal that causes erroneous billing in the event of a failure.

As explained above, according to the method for preventing poor recovery in the event of a failure in a manual hold line of the present invention, it is possible to prevent invalid hold and erroneous billing due to poor recovery of the manual hold line when a trouble occurs in the transport device, and also prevent new calls from being received. This blocking system is realized by providing one small relay for each system in a common part of the alarm signal reception and signal conversion device through a separate line. Therefore, by using this system, it becomes possible to connect the manual hold line to the telephone exchange through the carrier device, and a very large effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a connection relay system when connecting telephone exchanges via a carrier device, FIG. 2 is a circuit diagram showing a closed circuit system in a conventional signal conversion device, and FIG. 3 is a circuit diagram showing a closed circuit system in a conventional signal conversion device. FIG. 2 is a circuit diagram showing the configuration of an embodiment of a method for preventing failure in recovery when a failure occurs in a manual hold line. T1, T2...Telephone, EXCH1, EXCH2
... Telephone exchange, TRK1, TRK2 ... Trunk for connecting between offices, MUX, MUX1, MUX2 ... Carrier multiplex converter, SC, SC1, SC2 ... Signal converter, VF ... VF unit, ALM ... Alarm monitoring Device, A, ANS, AL, ALM'... Electromagnetic relay, a, ans, al, alm'... Relay contact, HYB
...hybrid coil, SIGTRS...control signal sending circuit, SIGREC...control signal receiving circuit,
COD...encoder, DEC...decoder, MU...multiple conversion circuit, A-DECT...electronic detector,
DRV...Relay drive circuit, SC-COM...Common part of signal converter, COM-CONT...Common control signal processing circuit, SIG-MUX...Multiple conversion circuit for control signals.

Claims (1)

[Claims] 1. In a manual hold line that connects a telephone exchange equipped with a circuit with a line holding function and a terminal equipment of a carrier device via a signal conversion device, a common system is provided for transmitting an alarm signal based on a fault on the called side to any number of lines. In addition to providing a separate line for receiving alarm signals from the monitoring device in the transport device to the signal conversion device, the signal conversion device is provided with a common control signal processing circuit that commonly processes control signals on the sending side and the receiving side, and the common system The power supply to the loop monitoring circuit which monitors the caller's hook-on and hook-off status from the originating telephone exchange through the communication path of the signal conversion device upon reception of the alarm signal is supplied line by line or in the pre-common control signal processing circuit. By disconnecting all at once, the line via the circuit equipped with the line hold function is released by the caller's telephone call and is then blocked from new calls from the originating telephone exchange. A method for preventing poor recovery in the event of a failure in a manual hold line.