JPS5923666A - Forcible disconnecting method of automatic exchange - Google Patents

Abstract

PURPOSE:To urge a caller to finish a call and to disconnect a trunk at a specified time later by interrupting the call and letting the caller hear a previously stored disconnection announcement message when the call is not completed within the specified time after a previous blocking indication is outputted. CONSTITUTION:An extension telephone set A is connected to a channel device F through a trunk line circuit LC and a trunk line unit C connecting with trunk lines G1-G4 is connected to the device F. Further, an input/output device E is connected to the device F through a processor D and a sound recording and reproducing circuit B incorporating a sound recording tape rotation sensor is connected; and a circuit B, trunk line unit C, and device D are connected, and the device D is provided with a memory M and a timer T. The previous blocking indication is inputted from the device E and applied to the memory M of the device D to store the disconnection announcement message in the circuit B by the command. When the call is not completed within the specified time, the call is interrupted to let the caller hear the message stored in the circuit B, and the trunk TRK is disconnected forcibly at the specified time later.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forcibly disconnecting an automatic switching system when a fault occurs in its central office line unit or the like.

Generally, if a failure occurs in a part of a unit that accommodates multiple lines, and there are still lines in use when that unit is replaced, the unit cannot be replaced until the calls are completed. In such cases, all lines housed in that unit are typically pre-blocked to prevent lines within that unit from being used for new calls. However, the maintenance person has to wait for the ongoing call to end in order to avoid disconnecting the call, which is inconvenient as it takes a long time to replace the unit.

The present invention aims to eliminate all of the above-mentioned drawbacks of the conventional art, and will be described below with reference to an embodiment thereof with reference to the drawings. In the drawings, A is an extension telephone B is a recording and reproducing device, and a recording tape rotation detection sensor R is provided inside.

C is a central office line unit equipped with trunks 1 to 4 (TRKI-TRK4), D is a processing device, E is an input/output device such as a typewriter, F is a communication path device, G1-G44 is a central office line,
M is a memory provided inside the processing device iD, which has a control word corresponding to a line (trunk), and further includes a pre-blocking bit' in the control word. T is a timer, LC is a station line circuit, and IP is a maintenance person.

Next, the operation will be explained. Assume that an extension subscriber is making a call using extension telephone A through telephone line G1 through trunk 1 (TRK1) i of telephone line unit C and telephone line a extending downward from the communication line device.

Assume that an abnormality occurs in trunk 2 (TRK2) in this state. In order to repair this trunk, maintenance person P must replace the central office line unit with a non-Cffiff unit. To this end, unused trunks in central office line unit C are pre-blocked, callers are instructed to end the call, and finally all trunks are forcibly disconnected.

First, a line pre-blocking command is input to the processing device using the input/output device. The processing device has the pre-block bit inside the memo IJM, so if this pit 1 is set, if a call is currently in progress on that trunk, after the call ends,
If the trunk is empty, the trunk is immediately blocked.

In a blocked state, this trunk will not be captured when making a call from the extension to the central office line, and any incoming calls to this trunk from the central office line will be ignored. Further, a message indicating that the blockage state has been reached is printed out to the input/output device E through the processing device. As a result, maintenance engineer M knows that the trunk has been blocked, and that all the trunks housed in the unit he wants to replace have been blocked and no one is talking, so he can replace unit (k) at this point. can.

Furthermore, when a pre-blocking is performed, a pre-blocking bit is set on the memory M in the processing unit, and the timer T is set to start from this point.

When this timer exceeds a certain set value T1, the processing device starts the recording/playback device B, and records the trunk 1 of the main device B, extension telephone A, recording/playback device B, and central office line unit C. TRK1) is connected separately, and messages prerecorded on recording/playback device B are simultaneously sent to extension telephone A and trunk 1 (TRK1). On the other hand, the recording/playback device B includes a recording tape rotation detection sensor R.
This sensor detects the number of rotations, the detection signal is sent to the processing device, and when the processing device detects the detection signal a predetermined number of times, it connects the recording/playback device B, extension telephone, and trunk 1 (TRK1). ), and the original extension telephone A and trunk 1 (TRK1) are reconnected, and the call can be made again. From this point on, the processing device starts the timer again. When the timer generates the next set value T2, the processing device sends a disconnection command to the central office line unit C, and the central office line unit C does not receive this command. When disconnected, the connection with the central office line (01 to G4 is cut 9 and the central office line unit C is returned to the idle state.The call is terminated by sending a busy tone to the subscriber of the one-way telephone A from the tone trunk (not shown). Let me know when it's cut off.

Note that in order to detect the abnormal state of the trunk, the following diagnostic method can be used.

A Check the call status by specifying the trunk number from the switchboard or maintenance telephone and making a call to the central office line.

B Are you sure that the test tone passes through the specified trunk communication path manually or automatically? IIi I agree. In the case of an abnormality, the contents of the abnormality are printed out on the input/output device E.

The control system is diagnosed by exchanging test signals between the control circuit in the C trunk and the processing device. If an abnormality is detected, the contents of the abnormality are printed out on typewriter E.

As explained above, according to the present invention, if the call does not end within a certain period of time after issuing a pre-blocking instruction, a disconnection notice message recorded in advance on the recording device is overwritten to the caller during the call. Get to 13 quickly by letting both parties hear it during the call! While encouraging the caller to talk, if the call still does not end, the trunk is forcibly disconnected after a certain period of time, which reduces maintenance work as much as possible, and also allows existing calls to be disconnected for a certain period of time. d) The system is characterized by automatically sending out a warning message without interfering with the call and voluntarily prompting the user to end the call, and then forcibly disconnecting the call only after a certain period of time has elapsed.

[Brief explanation of the drawing]

The drawing is a block diagram for explaining a forced disconnection method of an automatic exchange according to an embodiment of the present invention. A: Extension telephone, B: Recording/playback circuit, C: Office line unit, D: Processing device, E
・・・・・・Input/output device.

Claims (1)

[Claims] A communication path device provided with a plurality of call switches for connecting a plurality of office lines via an extension line and a plurality of trunk units If, and a processing circuit for controlling the communication path device and the trunk unit. A command is sent from the output device to the processing circuit, and the processing device consults a built-in memory circuit that stores the call status of the trunk unit, blocks unused trunks, starts a timer circuit, and makes an announcement after a certain period of time has elapsed. Activates the recording and playback circuit for the above-mentioned announcement, interrupts the call path 1 in use, and after a certain period of time has passed after the end of the announcement, forcibly disconnects all the above-mentioned plurality of trunk units, and A forced disconnection method for an automatic switchboard that allows trunk unit replacement.