JPS61187496A - Emergency calling connection control system - Google Patents

Abstract

PURPOSE:To enhance a service by informing a connection unable to a calling for a connection unable in case of the failure of a PCM line between a remote concentrator and a host office. CONSTITUTION:An emergency calling connecting equipment 7 carries out the control of a remote concentrator 2 based on a calling information from a subscriber 1. Even when the emergency calling connecting equipment 7 is connected to the host office 6, since the number of an analog lines is small, a connection is limited only to an emergency calling. Accordingly, as for an ordinary connecting calling, the connection is impossible. In such a case, the emergency calling connecting equipment 7 activates an announce equipment 8 through a trunk (TKT) 9. Thereby, from the announce equipment 8, to calling subscribers, a temporary connection unable due to the failure of the line is informed. Therefore, to a connection unable calling of a connection calling, the explanation of a situation of the system is made possible.

Description

[Detailed Description of the Invention] [Summary] In a switching system in which a remote concentrator accommodating a plurality of subscribers is connected to a master station via a PCM line, when a PCM line failure occurs, the subscriber accommodated in the remote concentrator This system improves service for subscribers accommodated in remote line concentrators by notifying them of unconnectable calls.

[Industrial application field]

The present invention relates to an emergency call connection control method in a switching system in which a remote line concentrator accommodating a plurality of subscribers and a master station are connected by a PCM line.

There is a switching system in which a remote line concentrator accommodates a plurality of subscribers dispersed from urban areas to remote locations, and the remote line concentrator is connected to a master station located in the urban area via a PCM line. In such a switching system, all subscribers accommodated in the remote concentrator are unable to make calls due to a failure in the PCM line.

Therefore, there is a demand for improved services for system users when such PCM lines fail.

[Conventional technology]

As one form of the above-mentioned service, an emergency call connection device is installed in the remote line concentrator, and in the event of a failure of the PCM line, the remote line concentrator and the emergency call connection device are connected and the remote line concentrator operates in the same way as an independent station. It is known to enable call connections between subscribers housed in remote concentrators. It is also known to connect this emergency call connection device to a master station or other switching station so that emergency calls made to police stations, fire departments, etc. can be connected. .

In this way, when an emergency call connection device is connected to a remote line concentrator, call connections can only be made between subscribers accommodated in the remote line concentrator, and emergency calls, such as calls to a police station or fire department, can be made. For calls, outgoing connections are possible.

[Problem that the invention seeks to solve]

Therefore, in such a conventional device, normal outgoing calls other than emergency calls are temporarily unconnectable. For these unconnectable calls, only a busy tone is sent and the reason for the unconnectable calls is unknown, resulting in a concentration of unconnectable calls due to re-calls. This kind of condition is
It cannot be said that good service is being provided to subscribers.

An object of the present invention is to improve the above-mentioned conventional drawbacks and to improve service by notifying a call that cannot be connected due to a fault in the PCM line between a remote concentrator and a master station. That is.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the present invention. In the figure, 1 is a subscriber, 2 is a remote concentrator, 3.4 is a digital terminal (DT), 5 is a PCM line, 6 is a master station, and 7 is a
is an emergency call connection device. Also, 10 is an outgoing trunk (OCT) including a DA converter, etc., 11 is an incoming trunk (ICT),
1.2 is an analog line.

Under normal conditions, the calling information of the subscriber 1 is transferred from the remote concentrator 2 to the master station 6 via the control channel of the PCM line, etc.
The central control device of the master station 6 identifies whether it is an extension connection or an outgoing connection, and control information such as channel assignment is transferred from the master station 6 to the remote line concentrator 2, and the remote line concentrator 2 connects the extension line according to the control information. Alternatively, outgoing connection control will be performed.

At this time, the emergency call connection device 7 is separated from the remote line concentrator 2.

In the event of a failure in the PCM line 5, when the remote line concentrator 2 detects the occurrence of the failure, the remote line concentrator 2 connects the emergency call connection device 7.
Make a connection between This emergency call connection device 7 notifies a call that cannot be connected that the connection is impossible.

[Effect]

In the case of a temporary connection failure for an outgoing connection call from subscriber 1 due to a PCM line failure, the emergency call connection device 7 will notify the connection failure, and the calling subscriber 1 will be unable to connect to the incoming call. It is determined that there is a problem with the PCM line rather than that the subscriber is busy, and there is no longer a concentration of unconnectable calls, thereby improving service to the subscriber.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts. 9 is a trunk (TXT) for connecting the announcement device 8.

The emergency call connection device 7 controls the remote line concentrator 2 based on call information from the subscriber 1. Even when the emergency call connection device 7 and the master station 6 are connected, since the number of analog lines 12 is small, outgoing connections are limited to emergency calls.

Therefore, it becomes impossible to connect to a normal outgoing connection call. In that case, the emergency call connection device 7 activates the announcement device 8 via the trunk 9. Thereby, the announcement device 8 notifies the calling subscriber that connection is temporarily unavailable due to a line failure. Therefore, it is possible to explain the system status for unconnectable calls such as outgoing calls.

FIG. 3 is a block diagram of another embodiment of the present invention;
The same reference numerals as in the figure indicate the same parts. In the figure, 13 is an announcement device, 14 is a trunk (TKT), and 15 is an operator stand. When a fault occurs in the PCM line 5 and a normal outgoing connection call is made from the subscriber 1 while the remote line concentrator 2 and the emergency call connection device 7 are connected,
The emergency call connection device 7 activates the outgoing trunk 10 and activates the incoming trunk 11 of the master station 6 via the analog line operator 2. The master station 6 activates the announcement device 13 by controlling the connection between the incoming trunks 11 and the trunks 14 or by using a fixed connection to notify the calling subscriber that the outgoing call is temporarily unconnectable due to a line failure. It is.

The father station 6 can also control connection to the operator console 15 by activating the incoming trunk 11. In this case, the operator will notify the calling subscriber that connection is temporarily unavailable due to a line failure.

FIG. 4 is a block diagram of still another embodiment of the present invention, in which the same reference numerals as in FIG. 2 indicate the same parts.

In the figure, 16 is a switching station different from the master station 6, 17 is an announcement device, 18 is a trunk (TKT), 19 is an operator console, 2o is an outgoing trunk (OCT), 21 is an incoming trunk (ICT), 22 is an analog line. This embodiment uses the remote concentrator 2 and the PCM times &? An exchange 16 different from the master station 6 connected by I5 and an emergency call connection device 7
This figure shows a case where the exchange 16 is connected to the exchange 16 and is provided with an announcement device 17 or an operator console 19.

When a fault occurs in the PCM line 5 and a normal outgoing connection call is made from the subscriber 1 while the remote concentrator 2 and the emergency call connection device 7 are connected, the emergency call connection device 7 The trunk 20 is activated, and the incoming trunk 21 of the exchange 16 is activated via the analog line 22. this person trunk 2
The announcement device 17 is activated by the connection control between the trunk 1 and the trunk 1, or by the fixed connection, and notifies the calling subscriber that the outgoing call is temporarily unconnectable due to a line failure. Furthermore, by activating the incoming trunk 21, the connection can be controlled or fixedly connected to the operator console 19, and the operator can notify the calling subscriber that the connection is not possible.

As mentioned above, when a failure occurs in the PCM line 5, the remote line concentrator 2 and the emergency call connection device 7 are read directly, and the remote line concentrator 2
operates like an independent station, and enables internal connection or outgoing connection for emergency calls to police stations, fire departments, etc., and announces devices 8, 13.1 for calls that cannot be connected out.
7 or operator console 15.19 to notify the calling subscriber that connection is temporarily unavailable due to a line failure.

〔Effect of the invention〕

As explained above, the present invention connects a remote concentrator 2 in which a plurality of subscribers 1 are accommodated to a master station 6 via a PCM line 5, and when a fault in the PCM line 5 occurs, the remote concentrator NIA device 2 Connect the emergency call connection device 7, and for unconnectable calls,
This notifies the calling subscriber that the connection is temporarily unavailable due to a line failure, and the calling subscriber is notified that the outgoing connection is not simply due to a busy call, thereby reducing the concentration of unconnectable calls. can be avoided. It is also possible, of course, to include announcements such as the timing of recovery from line failures.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, and FIGS. 2, 3, and 4 are block diagrams of different embodiments of the present invention. 1 is a subscriber, 2 is a remote line concentrator, 3 and 4 are digital terminals (DT), 5 is a PCM line, 6 is a master station, 7 is an emergency call connection device, 8, 13.17 is an announcement device, 9
, 14.18 is the trunk (TXT), 10.20 is the outgoing trunk (OCT), and 11.21 is the incoming trunk (IC
T), 12.22 is an analog line, and 15.19 is an operator console. Block diagram of the principle of this investigation Block diagram of an example of this investigation

Claims (2)

[Claims] (1) a remote line concentrator (2) accommodating a plurality of subscribers (1); a master station (6) connected to the remote line concentrator (2) via a PCM line (5); and the PCM Due to a failure in the line (5), the remote line concentrator (
2) operates as an independent station and enables call connection with the master station (6); Connecting a call connection device (7) to the remote line concentrator (2), and notifying the calling subscriber of the unconnectable call of the subscriber accommodated in the remote line concentrator (2). An emergency call connection control method characterized by: (2) In claim 1, when a subscriber makes a call that cannot be connected, the system connects to an announcement device or an operator console to notify the calling subscriber that the connection cannot be made. Features of emergency call connection control method.