JPS5970348A - System for substituting urgent emergent call - Google Patents

Abstract

PURPOSE:To attain important call even if the function of an exchange is made inactive, by accommodating in switching a specific subscriber and an incoming relay line to other substituting exchange. CONSTITUTION:When the exchange function is made inactive due to a failure, etc. occurred in an exchange 10, a central controller 11 can no longer transmit a command s1 to a monitor 15 at each prescribed period. Then, the monitor 15 detects the disordered function of the exchange 10, switches switching devices 16, 17, 18 so as to switch a specific subscriber 21 and the incoming relay line 3 to the substituting exchange 5. Thus, the call produced in the specific subscriber 21 and the incoming relay line 3 is connected with the substituting exchange 5 to attain an urgent emergency call.

Description

DETAILED DESCRIPTION OF THE INVENTION +81 TECHNICAL FIELD OF THE INVENTION The present invention relates to an emergency call replacement system, and more particularly to an emergency call replacement system in an automatic switching system accommodating subscribers and incoming trunk lines.

Prior art and problems FIG. 1 is a diagram showing an example of an automatic switchboard to which the present invention is applied. FIG. 1 shows an electronic exchange 1 that accommodates subscribers 2, main trunk lines 3, and outgoing trunk lines 4. In FIG. The electronic exchange 1 has a central control unit 11, a network 12, an incoming trunk 13, and an outgoing trunk 14, and exchanges and connects accommodated subscribers 2, a large trunk line 3, and an outgoing trunk line 4 to each other. If a failure or the like occurs in the electronic exchange 1 and the exchange connection function becomes paralyzed, all subscribers 2 or incoming trunk lines 3
Calls originating from the service become unreachable, and there is no way to recover.

As is clear from the above explanation, in the conventional electronic exchange 1, if the exchange connection function is paralyzed, calls occurring to all subscribers 2 or incoming trunk lines 3 will be unable to communicate, and there is no remedy. There wasn't.

In particular, disruption of emergency calls for police, fire, medical, etc. will have a serious impact on society.

[fll Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of conventional automatic exchanges as described above, and to realize a means for securing especially important emergency calls even when the functions of the automatic exchange are paralyzed. is in

(dl.Structure of the Invention) The object of the present invention is to provide, in an automatic exchange that accommodates subscribers and incoming trunk lines, a detection means for detecting functional paralysis of the automatic exchange; This is achieved by providing a switching means for switching a predetermined specific subscriber and the incoming trunk line to another automatic exchange predetermined as an alternative exchange.

(el　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram illustrating an emergency call alternative method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, the electronic exchange 0 is equipped with a monitoring device 15, switching devices 16, 17, and 18, and accommodates a specific subscriber 21 related to emergency calls and other general subscribers 2. Subscribers 2z and 2z.

Further, an electronic exchange 5 other than the electronic exchange 10 accommodating the subscriber 6, the main trunk line 7, and the outgoing trunk line 8 is predetermined as an alternative exchange. The central control device 11 also has a function of transmitting a command S1 to the monitoring device 15 at predetermined intervals when the electronic exchange 10 is operating normally.

The monitoring device 15 that periodically receives the command S1 determines that the electronic exchange 10 is operating normally, and switches the switching device 16
．． The switching instruction S2 is not transmitted to 17 and 18. The switching devices 16, 17 and 18 that do not receive the switching instruction S2 switch the specific subscriber 21 and the general subscriber 22 to the network 12.
and connect the trunk line 3 to the incoming trunk 13. As a result, the electronic exchange 10 performs switching connections in the same manner as the electronic exchange 1 in FIG. If a failure or the like occurs in the electronic exchange 10 in such a state and the exchange connection function becomes paralyzed, the central control device 11 no longer sends the command S1 to the monitoring device 15.
becomes impossible to transmit at predetermined intervals. The monitoring device 15 detects that the electronic exchange 10 is paralyzed due to the periodic failure to receive the command S1 from the central control device 11, and transmits a switching instruction S2 to the switching devices 16, 17 and 18. The switching devices 16 and 18 switch the specific subscriber 21 and the main trunk line 3 accommodated in the electronic exchange 10 to the alternative exchange 5.

The substitute exchange 5 accommodates the switched specific subscriber 21 in a substitute subscriber terminal 56 provided in advance in the network 12, and also connects the switched incoming trunk line 3 to a substitute trunk 57 provided in advance. do. Furthermore, the central control unit 11 in the alternate exchange 5 has a function of switching and connecting the specific subscriber 21 accommodated in the alternate subscriber terminal 56 and the incoming trunk line 3 connected to the alternate trunk 57. Therefore, subsequent calls occurring to the specific subscriber 21 and the incoming trunk line 3 are switched and connected by the alternative exchange 5, and the emergency call is secured. On the other hand, the switching device 17 connects the general subscriber 22 to the talkie
It connects to the device 19 and notifies it that it is in a call-disabled state. Note that while receiving the command s2, the switching devices 16 and 18 monitor the call status of the specific subscriber 21 or the main trunk line 3 by known means. When the exchange connection function of the electronic exchange 10 is eventually restored, the central control device 11 again starts transmitting the command sl to the monitoring device 15 at predetermined intervals. The monitoring device 15, which has periodically received the instruction S1, transmits a switching instruction S2 to the switching devices 16, 17 and 18. The switching devices 16 and 18 that have received the switching command S2 immediately switch to the electronic exchange 10 to accommodate the specified subscriber 21 or the incoming trunk line 3 that is currently being switched, if the specific subscriber 21 or the incoming trunk line 3 that is being switched is in an idle state, and then remain in a talking state. In this case, the telephone exchange is switched to the electronic exchange 10 after waiting for the end of the telephone call. On the other hand, the switching device 17 immediately switches and accommodates the general subscriber 22 to the network 12.

As is clear from the above description, according to the present embodiment, even if the exchange connection function of the electronic exchange 10 is paralyzed, calls occurring to the specific subscriber 21 and the incoming trunk line 3 related to the emergency emergency call can be substituted. Continued processing by the exchange 5 ensures that the emergency call is secured.

Note that FIG. 2 is only one embodiment of the present invention, and for example, the monitoring device 15 is limited to one that detects functional paralysis due to interruption of the command S1 periodically transmitted from the central control device 11. Although there are many variations in the transmission of the command indicating functional paralysis from the central control unit 11, the effects of the present invention remain the same in any case. Further, the object of the present invention is not limited to the electronic exchange 1, and even if applied to other automatic exchanges, the effects will remain the same.

(f) Effects of the Invention According to the present invention, even if the exchange connection function is paralyzed due to a failure or the like in the automatic exchange, the emergency call can be secured by an alternative exchange, thereby suppressing the social impact. I can do it.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of an automatic exchange to which the present invention is applied, and FIG. 2 is a diagram showing an emergency call alternative system according to an embodiment of the present invention. In the figure, 1 and 10 are electronic exchanges, 11 is a central control unit, 12 is a network, 13 is a large trunk, and 14
Exit trunk, 15 is monitoring device, 16.17 and 18
19 is a switching device, 19 is a talkie device, 2 and 6 are subscribers, 21 is a specific subscriber, 22 is a general subscriber, 3 and 7 are main trunk lines, 4 and 8 are outgoing trunk lines, 5 is an alternative exchange, 5
6 indicates an alternative subscriber terminal, 57 indicates an alternative trunk, SL indicates a command, and s2 indicates a switching instruction.

Claims (1)

[Claims] At an automatic switchboard that accommodates subscribers and incoming trunk lines,
a detection means for detecting a functional paralysis of the automatic exchange; and a predetermined specific subscriber accommodated in the automatic exchange and the incoming trunk line, which are predetermined as an alternative exchange when the detection means detects a functional paralysis. and a switching means for switching to another automatic exchange.