JPH10224467A - Exchange network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exchange network with which the communication data of important subscriber as a predetermined specified subscriber can be automatically relieved even without any auxiliary exchange or requiring any instruction due to a maintenance person. SOLUTION: A time slot for relief for letting the communication data of important subscriber ride on in the case of relief is allocated to transmission lines 141 and 142 between a subscriber distributor 130 and exchanges 150 and 160 and the subscriber distributor 130 temporarily houses the important subscriber, who disables the transmission of communication data to the exchange at the housing destination of used line because of the fault generated at the transmission lines 141 and 142 or the exchanges 150 and 160, in the other exchange by letting the communication data of that important subscriber ride on the time slot for relief allocated to the transmission line with the other usable exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of multiplexing apparatuses for time-division multiplexing communication data of a subscriber, a plurality of exchanges accommodating a subscriber's line, and a plurality of exchanges connected therebetween. In a switching network constructed with a subscriber distribution device, if a failure occurs in any of the exchanges or any of the transmission paths between the exchange and the subscriber distribution device, communication data due to the failure is generated. TECHNICAL FIELD The present invention relates to a technique for rescuing communication data of a predetermined specific subscriber among subscribers who have become unable to transmit data.

[0002]

2. Description of the Related Art A conventional switching network is disclosed in, for example,
As described in Japanese Patent No. 6470, the configuration includes a plurality of working exchanges and one spare exchange.
If any one of the working exchanges fails,
A method is adopted in which communication data of all subscribers whose working lines are accommodated in the working exchange is transferred to a spare exchange.

[0003]

According to the conventional switching network, it is possible to rescue the communication data of all the subscribers whose working lines are accommodated in the working switchboard in which a failure has occurred, but one There is a major problem in capital investment, as it is necessary to provide a spare switch as redundant equipment.

[0004] In the event of a disaster such as an earthquake, two or more working exchanges may fail at the same time.
Since the conventional switching network does not consider such a case, when such a case actually occurs, the communication data of the subscriber whose use line is accommodated in only one of the working exchanges is stored in the spare network. There is a problem in that communication data of a subscriber who is transferred to an exchange and whose working lines are accommodated in other working exchanges are not transferred to a spare exchange and communication is interrupted.

Further, in the conventional switching network, since the transfer from the working switch to the spare switch is performed according to the instruction of the maintenance person, when the traffic is interrupted due to a disaster and the maintenance person cannot give the instruction. Has a problem that it is not possible to transfer from a working exchange to a spare exchange.

In recent years, with the introduction of various operators into the exchange business, even subscribers whose communication data is time-division multiplexed by the same multiplexing device become the accommodation destination of the used line. The phenomenon that exchanges are different has begun to occur.

[0007] Thus, between a plurality of multiplexing devices and a plurality of exchanges, the communication data transmitted from each of these multiplexing devices is transmitted to an exchange accommodating the line used by the corresponding subscriber. A switching network has been constructed in which a subscriber distribution device for transmitting communication data transmitted from each of these exchanges to a multiplexing device to which a corresponding subscriber is connected is installed.

[0008] An object of the present invention is to provide a system in which this subscriber distributing apparatus is used for an exchange which cannot transmit communication data due to the failure when a failure occurs in the exchange or the transmission path to the exchange. Is automatically transmitted to other available exchanges of communication data of a predetermined specific subscriber (hereinafter, referred to as an "important subscriber") among the subscribers accommodated. By doing so, it is possible to rescue communication data of important subscribers without providing a spare exchange and without requiring instructions from a maintenance person.

[0009]

In order to achieve the above object, the present invention, as a first aspect, comprises a plurality of subscribers connecting a plurality of subscribers and time-division multiplexing the communication data of these subscribers. A multiplex device, a plurality of exchanges accommodating lines used by a plurality of subscribers and performing exchange processing on communication data of these subscribers, and the plurality of exchanges are installed between the plurality of multiplex devices and the plurality of exchanges; The communication data transmitted from each of the plurality of multiplexing devices is transmitted to the exchange accommodating the line used by the corresponding subscriber, and the communication data transmitted from each of the plurality of exchanges is transmitted to the corresponding subscriber. In a switching network provided with a subscriber distribution device for transmitting data to a multiplexing device connected to a plurality of exchanges, communication data is transmitted to an exchange-facing transmission line, which is a transmission line between each of the plurality of exchanges and the subscriber distribution device. The time slots placed in the normal Separately, important subscriber of the communication data is a specific subscriber a predetermined is placed at the time of failure, one or more relief time slots so that has been permanently assigned.

[0010] The subscriber distribution device indicates important subscriber storage means for storing information indicating important subscribers, and indicates a rescue time slot assigned to each of the plurality of exchange-facing transmission paths. A rescue time slot storing means for storing information, and when a failure occurs in any of the plurality of exchanges and the plurality of exchange-facing transmission paths, communication data can be transmitted by the failure. Among the subscribers whose working lines are accommodated in the lost exchange, an important subscriber is determined based on the storage contents of the important subscriber storage means, and communication data cannot be transmitted due to the failure. One of the exchange-facing transmission paths other than the exchange-facing transmission path, based on the storage contents of the rescue time slot storage means, Select timeslot, the importance subscriber of the communication data obtained, so as to have a significant subscriber remedies put in relief the time slot selected,
The plurality of exchanges also perform exchange processing with respect to communication data of important subscribers to be placed in a rescue time slot allocated to an exchange-facing transmission line between the plurality of exchanges and the subscriber sorting device. .

According to the first aspect, when a failure occurs in any one of the plurality of exchanges and the plurality of exchange-facing transmission lines, the subscriber distribution device transmits communication data due to the failure. For important subscribers whose subscriber lines are accommodated in the exchange that has become unable to perform communication, the exchanges other than the exchange-facing transmission line that cannot automatically transmit communication data due to the failure. Since the rescue time slot is assigned to one of the opposing transmission lines, the line used by the important subscriber is temporarily accommodated in another exchange, and the communication of the important subscriber is performed. Data can be rescued.

[0012] Naturally, the greater the number of rescue time slots allocated to each exchange-facing transmission line, the greater the number of subscribers who can rescue communication data as important subscribers. .

According to a second aspect of the present invention, in the first aspect described above, the plurality of exchanges are provided with a rescue system assigned to an exchange-facing transmission path between itself and the subscriber distribution device. Information necessary for performing exchange processing on communication data of important subscribers placed in the rescue time slot, including at least the information indicating the rescue time slot and the telephone number uniquely specified for the rescue time slot. The communication information loaded in the rescue information storage means storing information and the rescue time slot allocated to the exchange-facing transmission path between the subscriber and the subscriber distributing apparatus is transmitted from the important subscriber. If the communication data represents the first outgoing call, the important subscriber is notified of a telephone number uniquely defined in the rescue time slot. And then, when the communication data loaded in the rescue time slot is communication data representing predetermined specific content from the important subscriber, a notification of the telephone number to the important subscriber And a telephone number notifying means for stopping the communication of the important subscriber after the telephone number notifying means stops the notification of the telephone number to the important subscriber. Can be.

[0014] The telephone number of the important subscriber rescued according to the first aspect described above is changed to a telephone number uniquely determined in the rescue time slot carrying the communication data of the important subscriber. However, according to the second aspect, the exchange temporarily accommodating the line used by the important subscriber notifies the changed telephone number at the time of the first outgoing call from the important subscriber. Therefore, the important subscriber can inform the called subscriber of the notified changed telephone number.

[0015] According to the second aspect, the exchange temporarily accommodating the line used by the important subscriber changes the notification given according to whether or not the important content has been transmitted by the important subscriber. It is possible to confirm whether or not the important subscriber has recognized the later telephone number. Here, the specific content may be various information such as information indicating that a predetermined number has been dialed and information indicating that hooking has been performed.

[0016] In the second aspect, the telephone number notifying means may further include, when exchange processing is being performed on the communication data of the important subscriber, the communication data of the important subscriber may be transmitted to the important subscriber. If the communication data represents the predetermined specific content from the important subscriber, the notification of the telephone number to the important subscriber is restarted, and then the communication data of the important subscriber is transmitted from the important subscriber. If the communication data represents predetermined specific contents, the notification of the telephone number to the important subscriber can be stopped.

[0017] In this way, the important subscriber can only transmit the specific content determined in advance during the call during the rescue,
The changed telephone number notified at the time of the first call can be notified again.

[0018] In the second aspect, the telephone number notifying means may further include, when an exchange process is being performed on the communication data of the important subscriber, the communication data of the important subscriber may be transmitted to the important subscriber. If the communication data represents predetermined specific content from, the notification of the telephone number to the important subscriber is restarted, and the notification of the telephone number to the destination subscriber of the important subscriber is performed. After that, when the communication data of the important subscriber is communication data representing predetermined specific content from the important subscriber, notification of the telephone number to the important subscriber and the destination subscriber is performed. Can be stopped.

[0019] In this way, the important subscriber can only transmit the specific content determined in advance during the call during rescue,
You will be notified of the changed phone number that was notified at the time of the first call, and at the same time, the other party will be notified of the changed phone number. You do not need to teach yourself.

According to a third aspect of the present invention, in the above-mentioned second aspect, the plurality of exchanges include a receiving means for receiving a designation to change the storage content of the rescue information storage means, There may be further provided a changing means for changing the storage content of the rescue information storage means in accordance with the specified content received by the receiving means.

According to the third aspect, the maintenance person is, for example,
By entering the specified content in a predetermined command format,
It is possible to assign an arbitrary telephone number to the rescue time slot, and to register information necessary for performing exchange processing on communication data of important subscribers put on the rescue time slot. Here, the receiving method of the receiving means includes a method of receiving an input from an input device of a maintenance terminal directly connected to each of the plurality of exchanges, and a method of receiving a maintenance network from a maintenance terminal installed in a remote place. Various methods are conceivable, such as a method of receiving the designated content transmitted via the.

According to a fourth aspect of the present invention, in any one of the first to third aspects described above, the subscriber distributing apparatus is characterized in that the important subscriber rescue means finds the important subscriber. And information indicating the rescue time slot selected by the important subscriber rescue means may be further provided with an output means for outputting the information in association with the information.

According to the fourth aspect, the maintenance person can know the important subscriber who is currently being rescued and the rescue time slot in which communication data of the important subscriber is loaded. Here, as an output method of the output means, a method of displaying on a display device of a maintenance terminal directly connected to the subscriber sorting device, or a method of outputting to a maintenance terminal installed at a remote place via a maintenance network. Various methods are conceivable, such as a transmission method.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects described above, the subscriber distribution device includes the important subscriber storage means and the rescue time slot. Receiving means for receiving a designation to change any of the stored contents of the storage means;
According to the specification received by the reception unit, the important subscriber storage unit and the rescue time slot storage unit may further include a change unit that changes the specified storage content.

According to the fifth aspect, the maintenance person is, for example,
By entering the specified content in a predetermined command format,
It becomes possible to register / cancel any subscriber as an important subscriber and to register / cancel any time slot as a rescue time slot. Here, as the receiving method of the receiving means, a method of receiving an input from an input device of a maintenance terminal directly connected to the subscriber sorting device, or a method of receiving a maintenance network from a maintenance terminal installed in a remote place. Various methods are conceivable, such as a method of receiving the designated contents transmitted via the Internet.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects described above, the important subscriber storage means includes a priority order given in advance for each important subscriber. The important subscriber rescue means, in order from the important subscriber having the highest priority stored in the important subscriber storage means, the communication data of the important subscriber for the selected rescue It can be put on a time slot.

According to the sixth aspect, since the communication data of the important subscriber can be relieved in order from the important subscriber having the highest priority, for example, a failure due to a widespread disaster such as an earthquake disaster can be obtained. If the number of important subscribers becomes larger than the number of available rescue time slots, such as when the number of available exchanges decreases, as shown in By doing so, confusion due to interruption of communication will not be caused.

According to a seventh aspect of the present invention, in any one of the first to fifth aspects described above, the subscriber distributing apparatus is characterized in that the important subscriber storage means stores information stored in the important subscriber storage means. And the rescue destination storage means for storing information for associating the important subscriber indicated by with the rescue time slot indicated by the information stored in the rescue time slot storage means. The means is based on the information stored in the rescue destination storage means.
The rescue time slot associated with the obtained important subscriber is selected, and the plurality of exchanges set the communication data of the important subscriber accommodating the used line in the time slot in which the communication data of the important subscriber is to be carried at normal time. A rescue destination telephone number in which a uniquely determined telephone number and a telephone number uniquely determined in a rescue time slot used when rescue communication data of the important subscriber are stored in association with each other. If a fault occurs in the storage means and the exchange-facing transmission path between itself and the above-mentioned subscriber sorting device, if there is an incoming call to an important subscriber accommodating the used line, the above-mentioned rescue is performed. Based on the contents stored in the destination telephone number storage means, the incoming call is forwarded to a telephone number uniquely defined in a rescue time slot used when rescue communication data of the important subscriber. It may further have a signal transfer means.

According to the seventh aspect, in particular, when the failure occurs in the exchange-facing transmission line and the exchange itself can operate, the communication data is lost due to the failure of the exchange-facing transmission line. It is possible to transfer an incoming call to an important subscriber who can no longer transmit a call to a telephone number uniquely defined in a rescue time slot carrying communication data of the important subscriber. Because
A subscriber who sends a call to a rescuing important subscriber does not need to be aware of the changed telephone number.

However, in the seventh aspect, in order to enable call transfer, it is necessary to associate a rescue time slot for carrying communication data at the time of rescue for each important subscriber. This conflicts with the sixth aspect.

According to an eighth aspect of the present invention, in the above-mentioned seventh aspect, the plurality of exchanges are configured such that a failure occurs in an exchange-facing transmission line between itself and the subscriber distribution device. Further, an output means for outputting the contents stored in the rescue destination telephone number storage means to the outside may be further provided.

[0032] According to the eighth aspect, the maintenance person can store the telephone number of the important subscriber whose usage line is accommodated in the exchange in which the failure has occurred in the exchange-compatible transmission line, and the communication data of the important subscriber. Since the changed telephone number can be known by being relieved, it is possible to know which telephone number is being forwarded to which telephone number. Here, as an output method of the output means, a method of displaying on a display device of a maintenance terminal directly connected to each of the plurality of exchanges, or a method of outputting to a maintenance terminal installed in a remote place via a maintenance network. Various methods are conceivable, such as a method of transmitting the data.

According to a ninth aspect of the present invention, there is provided any one of the seventh and eighth aspects described above.
The subscriber allocating device includes: a receiving unit that receives a designation of changing a storage content of the rescue destination storage unit; and a changing unit that changes storage content of the rescue destination storage unit in accordance with the specification content received by the receiving unit. And can further be provided.

According to the ninth aspect, the maintenance person can, for example,
By entering the specified content in a predetermined command format,
It becomes possible to change the correspondence relationship between the important subscribers and the rescue time slots for carrying the communication data at the time of rescue. Here, as a receiving method of the above receiving means,
A method for receiving an input from an input device of a maintenance terminal directly connected to the subscriber distribution device, and a method for receiving designated contents transmitted from a maintenance terminal installed in a remote place via a maintenance network Various methods are conceivable.

According to a tenth aspect of the present invention, in any one of the seventh to ninth aspects described above, the plurality of exchanges change storage contents of the relief destination telephone number storage means. Receiving means for receiving the designation of the purport, and changing means for changing the storage content of the relief destination telephone number means in accordance with the specification content received by the receiving means.

According to the tenth aspect, the maintenance person changes the telephone number to which the incoming call is transferred to the important subscriber, for example, by inputting the specified content in a predetermined command format. Becomes possible. Here, the receiving method of the receiving means includes a method of receiving an input from an input device of a maintenance terminal directly connected to each of the plurality of exchanges, and a method of receiving a maintenance network from a maintenance terminal installed in a remote place. Various methods are conceivable, such as a method of receiving the designated content transmitted via the.

As described above, according to the switching network of the present invention, unlike the conventional switching network, even if a spare exchange is not provided and an instruction from a maintenance person is not required, the important subscriber can be used. Communication data can be saved.

[0038]

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

First, the switching network according to the first embodiment of the present invention will be described.

FIG. 1 is a block diagram showing the configuration of the switching network of the first embodiment.

In FIG. 1, 101 to 106 are subscribers,
Reference numerals 111 and 112 denote multiplexing devices, 130 denotes a subscriber distribution device, and 150 and 160 denote exchanges.

Further, in FIG.
Each of the multiplexing devices 111 and 112 and the subscriber sorting device 1
30 (hereinafter referred to as a “multiplexer-facing transmission line”). Time slots t01 to t03 are allocated to the multiplexing device facing transmission path 121, and time slots t04 to t0 are allocated to the multiplexing device facing transmission line 122.
6 has been assigned.

Also, in FIG.
The subscriber sorting device 130 and the exchanges 150 and 16 are respectively provided.
0 (hereinafter, referred to as “exchange-facing transmission path”). Time slots t10 to t14 are assigned to the exchange-facing transmission path 141, and time slots t20 to t24 are assigned to the exchange-facing transmission path 142.

The multiplexers 111 and 112 connect a plurality of subscribers and time-division multiplex communication data of these subscribers.

In the example of FIG. 1, the multiplexing device 111 connects the subscribers 101 to 103 and transmits the communication data a to c of the subscribers 101 to 103 to the time allocated to the multiplexing device transmission line 121, respectively. Time-division multiplexing is realized by putting on slots t01 to t03. The multiplexing device 112 connects the subscribers 104 to 106, and
The communication data df of 4 to 106 are respectively transmitted to the time slot t0 assigned to the
Time division multiplexing is realized by putting the values on 4 to t06.

The exchanges 150 and 160 accommodate lines used by a plurality of subscribers, and perform exchange processing on communication data of these subscribers.

In the example of FIG. 1, the exchange 150
The exchanges 160 accommodate the lines used by the subscribers 102, 104, and 105, respectively.

Also, as shown in FIG.
Has a storage device 151, a control device 152, a communication path device 153, and a communication abnormality monitoring device 154, and connects a maintenance terminal 155. Similarly, the exchange 160 has a storage device 161 Device 162 and communication path device 163
And a communication abnormality monitoring device 164.
5 are connected.

The subscriber distribution device 130 transmits the communication data transmitted from each of the plurality of multiplexing devices to the exchange accommodating the line used by the corresponding subscriber, and also transmits the communication data from each of the plurality of exchanges. The communication data is transmitted to the multiplexing device to which the corresponding subscriber is connected.

In the example of FIG. 1, the subscriber sorting device 130
The communication data a to c of the subscribers 101 to 103 carried in the time slots t01 to t03 assigned to the multiplexing device facing transmission line 121 respectively correspond to the time assigned to the switching device facing transmission line 141. A slot t10, a time slot t22 assigned to the exchange-facing transmission path 142, a time slot t12 assigned to the exchange-facing transmission path 141, and
By assigning the communication data a to c of the subscribers 101 to 103 carried in the time slots t10, t22, and t12 to the time slots t01 to t03, respectively, the distribution of the subscribers is realized. Similarly, the subscriber sorting device 130 converts the communication data d to f of the subscribers 104 to 106 that have been loaded in the time slots t04 to t06 assigned to the multiplexing device transmission line 122,
The time slot t20 is assigned to the time slot t20 assigned to the exchange-facing transmission line 142, the time slot t21 assigned to the exchange-facing transmission line 142, and the time slot t11 assigned to the exchange-facing transmission line 141, respectively. , T21, and t11, the communication data d to f of the subscribers 104 to 106, respectively, are loaded in the time slots t04 to t06, thereby realizing the distribution of the subscribers.

As shown in FIG. 1, the subscriber distribution device 130 includes a storage device 131, a control device 132,
A communication path device 133 and a communication abnormality monitoring device 134 are provided, and a maintenance terminal 135 is connected.

Further, as shown in FIG. 1, the subscriber sorting device 130 and the exchanges 150 and 160 are both connected to a remote maintenance terminal 170 via a maintenance network 171.

A feature of the first embodiment is that, when a failure occurs in any of the exchanges or any of the exchange-facing transmission paths, the failure makes it impossible to transmit communication data due to the failure. Communication data of predetermined specific subscribers (hereinafter, referred to as "important subscribers") among the subscribers.

Therefore, in the first embodiment,
One or more rescue time slots, in which communication data of important subscribers are carried at the time of rescue, are always assigned to the exchange-facing transmission path, separately from time slots at which communication data is carried at the normal time.

In the example of FIG. 1, the time slot t14 of the exchange-facing transmission line 141 and the time
The second time slot t24 is allocated as a rescue time slot.

FIG. 2 is a diagram showing an image of data stored in storage device 131 of subscriber distribution device 130.

In FIG. 2, reference numeral 201 denotes a subscriber data table, and reference numeral 202 denotes a rescue time slot table.

The subscriber data table 201 includes, for each piece of subscriber identification information 203 for identifying a subscriber, path information 204 necessary for realizing the distribution of the subscriber,
Transmission line identification information 205 for identifying the exchange-facing transmission line to which the time slot in which the communication data of the subscriber is placed is assigned, and an important subscriber flag indicating whether or not the subscriber is an important subscriber. Reference numeral 206 denotes a stored table.

In the example of FIG. 2, the subscribers 101, 104, 1
A value (“YES”) indicating that the subscriber is an important subscriber is stored in the important subscriber flag 206 corresponding to the “05”. That is, in the first embodiment, the subscribers 101, 1
04 and 105 are important subscribers.

The above-mentioned distribution of subscribers is performed by the control unit 1
32 is performed by controlling the communication path device 133 in accordance with the path information 204 in the subscriber data table 201 stored in the storage device 131.

The rescue time slot table 20
Reference numeral 2 denotes a table in which time slot identification information 207 for identifying a rescue time slot and an in-use flag 208 indicating whether the rescue time slot is in use are stored.

As described above, in the first embodiment, the time slot t14,
And a time slot t2 of the exchange-facing transmission line 142.
4 is assigned as a rescue time slot, so as shown in FIG.
Stores values indicating the time slots t14 and t24.

FIG. 3 shows the storage device 1 of the exchanges 150 and 160.
It is a figure which shows the image of the data memorize | stored in 51,161.

In FIG. 3, reference numerals 301 and 302 represent
6 is a subscriber data table stored in storage devices 151 and 161 of exchanges 150 and 160.

The subscriber data table 301 contains, for each time slot identification information 303 for identifying a time slot assigned to the exchange-facing transmission line 141,
The subscriber information 304, which is information necessary for performing exchange processing on the communication data of the subscriber carried in the time slot, the telephone number 305 uniquely defined for the time slot, and the time slot This is a table in which a rescue flag 306 indicating whether the time slot is a rescue time slot is stored.

Similarly, the subscriber data table 302
Time slot identification information 303 for identifying a time slot assigned to the exchange-facing transmission line 142
Each time, the subscriber information 304 which is information necessary for performing an exchange process on the communication data of the subscriber carried in the time slot, the telephone number 305 uniquely defined for the time slot, A rescue flag 30 indicating whether or not the time slot is a rescue time slot
6 are stored tables.

As described above, in the first embodiment, the time slot t14,
And a time slot t2 of the exchange-facing transmission line 142.
4 is assigned as a rescue time slot, as shown in FIG. 3, the rescue flag 306 corresponding to the time slot t14 in the subscriber data table 301.
Is a value indicating that the time slot is a rescue time slot (“YE
S ") is stored in the subscriber data table 302.
The rescue flag 30 corresponding to the middle time slot t24
6 shows a value (“YE
S ”) is stored.

As will be described later, in the first embodiment, since the important subscriber to whom communication data is placed in the rescue time slot is unspecified, the subscriber information 304 of the rescue time slot is included in the rescue time slot. For example, only the minimum information required for performing the exchange process, such as whether the terminal is at home or public, or whether the terminal is a touch phone or a dial phone, is stored. It is necessary to be a subscriber according to the contents of the subscriber information 304.

Next, an operation of rescuing an important subscriber in the first embodiment will be described.

Prior to the description, the operation of registering various information will be described.

In order to make the subscribers 101, 104, and 105 important subscribers, first, these subscribers 101, 10
For 4,105, it is necessary to register that it is an important subscriber.

This registration is performed by the maintenance person by the maintenance terminal 135.
Alternatively, a command of a predetermined format is input from the remote maintenance terminal 170 to the subscriber distribution device 130,
This is performed by rewriting the subscriber data table 201 stored in the storage device 131 of the subscriber distribution device 130. Specifically, in the subscriber data table 201 shown in FIG. 2, "YES" is set to the important subscriber flags 206 corresponding to the subscribers 101, 104, and 105.

The format of a command input by the maintenance person when registering the important subscriber is, for example, as shown in FIG.

In FIG. 4, reference numerals 401 and 402 denote important subscriber setting commands. Of these, the important subscriber setting command 401 is a command to be entered when registering that the subscriber is an important subscriber. User setting command 40
Reference numeral 2 denotes a command to be input when canceling the important subscriber.

As shown in FIG. 4, the important subscriber setting command 401 has, as a first parameter, information indicating registration, and as a second parameter, a subscriber to be registered as an important subscriber. You have a phone number.

The important subscriber setting command 402 is
As the first parameter, information indicating cancellation is provided,
As the second parameter, the telephone number of the subscriber whose important subscriber is to be released is included.

On the other hand, in order to assign the time slots t14 and t24 as the rescue time slots, first,
For these time slots t14 and t24, it is necessary to register that they are rescue time slots.

This registration is performed by the maintenance person by the maintenance terminal 135.
Alternatively, a command of a predetermined format is input from the remote maintenance terminal 170 to the subscriber distribution device 130,
This is performed by rewriting the rescue time slot table 202 stored in the storage device 131 of the subscriber distribution device 130. Specifically, in the rescue time slot table 202 shown in FIG. 2, information for identifying the time slots t14 and t24 is set in the time slot identification information 207.

The format of the command input by the maintenance person when registering that the time slot is a rescue time slot is shown in FIG.
Since it is easy to guess from the command format shown in FIG.

At this time, the maintenance person further inputs a command in a predetermined format to the exchanges 150 and 160 from the maintenance terminals 155 and 165 or the remote maintenance terminal 170, and , 160, the subscriber data tables 301 and 302 stored in the storage devices 151 and 161 need to be rewritten. Specifically, the rescue flag 30 corresponding to the time slot t14 in the subscriber data table 301 shown in FIG.
6 is set to "YES" and the time slot t1
4 is to set the subscriber information 304 corresponding to
In the subscriber data table 302 shown in FIG. 3, "YES" is set to the rescue flag 306 corresponding to the time slot t24, and the subscriber information 304 corresponding to the time slot t24 is set.

The subscriber data tables 301 and 30
Since the format of the command input by the maintenance person when rewriting 2 is easily guessed from the command format shown in FIG. 4, the description is omitted.

The registration operation described above is particularly
When the operation is performed from the remote maintenance terminal 170, the operation can be performed collectively.

In the state where various information is registered as described above, for example, a failure occurs in the exchange 160 or the exchange-facing transmission line 142, and the subscriber sorting device 130
Is the subscriber 1 whose exchange 160 accommodates the used line.
The operation of the important subscriber rescue according to the first embodiment will be described by taking as an example a case where the communication data b, d, e of 02, 104, 105 cannot be transmitted.

Exchange 160 or Exchange Opposite Transmission Line 14
If a failure occurs in the second, the exchange-facing transmission line 142 becomes unusable. Therefore, in the subscriber distribution device 130, the communication abnormality monitoring device 134 detects that fact and notifies the control device 132.

The control device 132 is a communication abnormality monitoring device 13
4 informs that the exchange-facing transmission line 142 is unusable, refers to the rescue time slot table 202 stored in the storage device 131, and switches to the exchange-facing transmission line other than the exchange-facing transmission line 142. Select an assigned rescue time slot.

In the rescue time slot table 202 shown in FIG. 2, only the time slot t14 assigned to the exchange-to-exchange transmission line 141 satisfies the condition. Therefore, the control unit 132 selects the rescue time slot t14. It will be.

Subsequently, the control device 132 sets the in-use flag 208 corresponding to the selected rescue time slot t14 in the rescue time slot table 202 to a value (“YES”) indicating that it is in use. Rewrite.

Subsequently, the control device 132
With reference to the subscriber data table 201 stored in No. 1, an important subscriber to whom communication data is transmitted on the exchange-facing transmission line 142 that has become unavailable is determined.

The subscriber data table 201 shown in FIG.
Then, since the important subscribers 104 and 105 satisfy the condition, the control device 132 determines one of the important subscribers 104 and 105. Here, the control device 132
However, the description is continued assuming that the important subscriber 104 has been selected.

Subsequently, the control device 132 indicates that the path information 204 corresponding to the determined important subscriber 104 in the subscriber data table 201 is to be extended between the time slot t04 and the time slot t20. The information is rewritten to information indicating that a path is established between the time slot t04 and the time slot t14.

Thus, under the control of the control device 132, the communication path device 133 controls the time slot t05 assigned to the multiplexer-facing transmission line 122 and the time slot t05 assigned to the exchange-facing transmission line 142.
22 is switched between the time slot t05 assigned to the multiplexing device opposite transmission line 122 and the rescue time slot t14 assigned to the switching device opposite transmission line 141. Because
The communication data d of the important subscriber 104 is stored in a time slot t05,
The important subscriber 1 is placed in the rescue time slot t14 assigned to the exchange-facing transmission path 141.
The used line 04 is temporarily accommodated in the exchange 150.

The exchange 150 stores information necessary for performing an exchange process in the subscriber information 304 corresponding to the rescue time slot t14 in the subscriber data table 301 shown in FIG. The exchange process can be performed on the communication data d of the important subscriber 104 put on the rescue time slot t14.

Therefore, even if the exchange-facing transmission line 142 becomes unusable, the communication data of the important subscriber 104 can be rescued.

As for the other important subscriber 105, in the example described above, the exchange-facing transmission line 142 is used.
Since only one rescue time slot t14 is allocated to the exchange-facing transmission line 141 other than the other, the rescue time of the subscriber 104 is as follows.
Since there is no available rescue time slot, the rescue will not be performed. However, the control device 132 continues until the important subscriber to be rescued runs out or no rescue time slot becomes available. Perform the operation.

The flowchart of the important subscriber rescue operation described above is as shown in FIG. Further, as a result of performing the important subscriber rescue operation described above, the destination of the communication data d of the important subscriber 104 in the switching network shown in FIG. 1 is changed as shown in FIG.

As described above, according to the first embodiment, when a failure occurs in any of the exchanges or any of the exchange-facing transmission lines, communication data can be transmitted due to the failure. The communication data of important subscribers whose working lines are accommodated in the exchange that cannot be used is automatically transmitted to other available exchanges. The communication data of the important subscriber can be rescued without requiring an instruction from the user.

In the first embodiment, the subscriber allocating apparatus 130 determines, for each of the important subscribers being rescued, the subscriber identification information 203 of the important subscriber and the communication of the important subscriber. A list in which the time slot identification information 207 of the rescue time slot in which the data is placed is output to the maintenance terminal 135 or the maintenance network 1
For example, it can be transmitted to the remote maintenance terminal 170 via the communication terminal 71.

In this way, the maintenance person can know the important subscriber currently being rescued and the rescue time slot in which communication data of the important subscriber is loaded.

In the first embodiment, the line used by the important subscriber being rescued is temporarily accommodated in another exchange, so that the telephone number of the important subscriber being rescued is The telephone number is changed to a telephone number uniquely determined for the rescue time slot in which the communication data of the subscriber is carried.

Therefore, in particular, the subscriber sorting device 130
Associates, for each of the important subscribers being rescued, the subscriber identification information 203 of the important subscriber and the time slot identification information 207 of the rescue time slot in which the communication data of the important subscriber is placed. If the list is transmitted to the remote maintenance terminal 170 via the maintenance network 171, the remote maintenance terminal 170 further temporarily stores the line used by the important subscriber from the list. Since the exchange (the exchange 150 in the example described above) that is accommodated can be known, the subscriber data table 301 stored in the storage device 151 of the exchange 150 is referred to via the maintenance network 171. Thus, a telephone number uniquely determined for the rescue time slot is obtained, and the obtained telephone number is output in association with the subscriber identification information 203 of the important subscriber. Rukoto can.

In this way, the maintenance person can know the important subscriber who is currently being rescued and the changed telephone number of the important subscriber.

For example, when the subscriber identification information 203 includes the subscriber name and the telephone number of the subscriber, the output content of the remote maintenance terminal 170 can be as shown in FIG.

Note that the subscriber sorting device 130 transmits a notification indicating that the important subscriber has been rescued to the remote maintenance terminal 170 via the maintenance network 171, and the remote maintenance terminal 171 transmits the notification to the remote maintenance terminal 170. Is received, the maintenance network 1
The storage device 13 of the subscriber distribution device 130 via 71
1 and refers to the subscriber data table 201 and the rescue time slot data 202 which are stored in the maintenance network 171.
Alternatively, the subscriber data table 201 and the rescue time slot data 202 stored in the storage device 131 of the subscriber distribution device 130 may be referred to via the.

As described above, in the first embodiment, since the line used by the rescuing important subscriber is temporarily accommodated in another exchange, the telephone line of the rescuing important subscriber is used. The number is changed to a telephone number that is uniquely defined for the rescue time slot in which the communication data of the important subscriber is placed.

At this time, the important subscriber being rescued can make a call without being conscious of the changed telephone number.
Other subscribers cannot call the rescuing important subscriber without knowing the changed telephone number. Moreover, the exchange temporarily accommodating the line used by the important subscriber being rescued can notify the important subscriber of the changed telephone number, but the incoming call to the important subscriber can be notified. Cannot reach the subscriber who sent the important subscriber the changed telephone number.

Therefore, in order for the important subscriber under rescue to inform other subscribers of the changed telephone number, the first telephone call from the rescuing important subscriber is notified of the changed telephone number. It is conceivable to make such a configuration, and an embodiment in which such configuration is performed will be described below as a second embodiment.

In the second embodiment, after the important subscriber rescue operation similar to that of the above-described first embodiment is performed, at the time of the first call from the rescuing important subscriber, the changed telephone number is talked to. The notification is made by using.

In the second embodiment, the exchange 15
0, 160 is used to determine whether or not it is the first call when a call is made from an important subscriber under rescue, that is, whether or not it is necessary to notify the changed telephone number. Instead of the subscriber data tables 301 and 302 shown,
Subscriber data tables 1601 and 1602 shown in FIG.
Is stored in the storage devices 151 and 161.

As shown in FIG. 16, the subscriber data table 1601 has the subscriber data table 3 shown in FIG.
In addition to the stored contents of “01”, a telephone number notification skip flag 1603 indicating whether to skip a telephone number notification operation described later is stored.

Similarly, in addition to the contents stored in subscriber data table 302 shown in FIG. 3, telephone data table 1602 indicates whether or not to skip telephone number notification in a telephone number notification operation described later. A number notification skip flag 1603 is stored.

Note that the telephone number notification skip flag 160
A value (“NO”) indicating that the telephone number notification is not skipped is set to 3 as an initial value.

Next, the operation of the telephone number notification in the second embodiment will be described by taking as an example a case where the exchange 150 temporarily accommodates the line used by the important subscriber 104.

Since the important subscriber rescue operation in the first embodiment is performed, the important subscriber 104
In the exchange 150 temporarily accommodating the used line, when an important subscriber 104 makes a call, the control device 152 sets the subscriber data table 1 shown in FIG.
Reference is made to a telephone number notification skip flag 1603 in 601 corresponding to the rescue time slot t14 in which the communication data of the important subscriber 104 has been loaded.

If the telephone number notification skip flag 1603 is “NO”, it means that the telephone number notification is not skipped, that is, it is the first call from the important subscriber 104, The device 153 controls the rescue time slot t under the control of the control device 152.
Make a pass between 14 and Talkie.

Here, since the only rescue time slot assigned to the exchange-facing transmission line 141 is the rescue time slot t14, the talkie is also assigned a telephone number uniquely specified for the rescue time slot t14. It is sufficient to use only a talkie that fixedly sends a message for notifying the user. The communication path device 153 extends a path between them, but two or more rescue time slots are provided in the exchange-facing transmission path 141. If is assigned, prepare the same number of messages as the number of rescue time slots, and control the talker to send the corresponding message, or use the same number of rescue time slots as the number of rescue time slots. Prepare and make a pass between the corresponding talkies.

Subsequently, the control device 152 controls the important subscriber 1
It is determined whether a predetermined number (hereinafter, referred to as a “special number”) has been transmitted from the subscriber data table 04 and, if it has been transmitted, the important subscriber 1 in the subscriber data table 1601.
Telephone number notification skip flag 160 corresponding to the rescue time slot t14 in which the communication data of No. 04 is loaded.
3, a value indicating that the telephone number notification is to be skipped ("YE
S "), the path between the rescue time slot t14 and the talkie is disconnected, and the system waits for the telephone number of the destination subscriber to be transmitted.

Thus, when there is a second or subsequent call from the important subscriber 104, since the telephone number has already been notified, no path is set between the rescue time slot t14 and the talkie. Then, it waits for the telephone number of the destination subscriber to be transmitted.

The reason why the path between the rescue time slot t14 and the talkie is cut off after waiting for the special number from the important subscriber 104 to be transmitted is that the important subscriber 104 recognizes the telephone number. At the exchange 150 side.

The sequence of the telephone number notification operation described above is as shown in FIG.

As described above, according to the second embodiment, the switching system temporarily accommodating the line used by the important subscriber makes the telephone after the change the first call from the important subscriber. Since the number is notified, the important subscriber can notify the called party of the notified telephone number after the change.

Further, according to the second embodiment, the exchange temporarily accommodating the line used by the important subscriber notifies the exchange according to whether or not the important subscriber has dialed a predetermined special number. It is possible to confirm whether the important subscriber has recognized the changed telephone number.

In the second embodiment, in order to confirm whether or not the important subscriber recognizes the notified telephone number after the change, the important subscriber is hooked instead of dialing the special number. It may be.

Further, in the second embodiment,
If a predetermined special number is transmitted from the important subscriber while the important subscriber being rescued is talking, the notification of the telephone number to the important subscriber is restarted. When a predetermined special number is transmitted from the user, the notification of the telephone number to the important subscriber can be stopped.

That is, in the exchange 150 temporarily accommodating the line used by the important subscriber 104, the control device 152, when a predetermined special number is transmitted from the important subscriber 104, the communication path device 153 , The path between the rescue time slot t14 in which the communication data of the important subscriber 104 is loaded and the time slot in which the communication data of the other party is loaded is held, and the rescue time is set. A path is set between the time slot t14 and the talkie.

Thereafter, the control device 152 sets the important subscriber 1
04 to determine whether or not a predetermined special number has been transmitted, and if it has been transmitted, a rescue time slot t
The path between 14 and the talkie is disconnected, and the hold state is released.

The time slot in which the communication data of the subscriber of the call partner is placed is the time slot in which the call partner
In the case of a subscriber accommodating the used line at 50, the time slot is assigned to the exchange transmission line 141, but the other party is a subscriber accommodating the used line at another exchange. In some cases, the time slot is assigned to a transmission path (not shown) between the exchange 150 and another exchange.

Thus, the important subscriber 104 can
During a call during rescue, simply dialing a predetermined special number allows the user to be notified of the changed telephone number notified at the time of the first call.

In this case as well, in order to notify again the changed telephone number notified at the time of the first call,
Instead of having the important subscriber dial the special number, the subscriber may be hooked.

Further, in the second embodiment,
When the important subscriber being rescued is talking on the phone and a special number is transmitted from the important subscriber, notification of the telephone number to the important subscriber is resumed, and The destination subscriber is also notified of the telephone number, and then, when the important subscriber transmits a predetermined special number, the telephone number is notified to the important subscriber and the subscriber of the other party. Can be stopped.

That is, in the exchange 150 temporarily accommodating the line used by the important subscriber 104, the control unit 152, when a special number predetermined from the important subscriber 104 is transmitted, the communication path unit 153. By cutting the path between the rescue time slot t14 in which the communication data of the important subscriber 104 is loaded and the time slot in which the communication data of the other party is loaded, the rescue time is reduced. A path is established between the slot t14 and the talkie, and a path is established between the time slot in which the communication data of the subscriber of the call partner is loaded and the talkie.

Thereafter, the control device 152 sets the important subscriber 1
04 to determine whether or not a predetermined special number has been transmitted, and if it has been transmitted, a rescue time slot t
In addition to disconnecting the path between the time slot 14 and the talkie, disconnecting the path between the time slot carrying the communication data of the subscriber of the call partner and the talkie, the rescue time slot t14 and the subscriber of the call partner A path between the time slot carrying the communication data and the time slot is established again.

The sequence of the telephone number notification operation described above is as shown in FIG.

In this way, the important subscriber 104
During a call during rescue, simply dialing a predetermined special number will allow you to be notified again of the changed telephone number that was notified at the time of the first call, and at the same time to the other party of the caller Since the telephone number is notified, there is no need to give the changed telephone number by itself.

In this case, in order to notify again the changed telephone number notified at the time of the first call,
Instead of having the important subscriber dial the special number, the subscriber may be hooked.

In the important subscriber rescue operation according to the first and second embodiments, the control unit 132 of the subscriber distribution device 130 rescues the important subscribers in order from the first found important subscriber. When the number of important subscribers to be rescued is larger than the number of available rescue time slots, the control unit determines which important subscriber is rescued and which is not rescued. 132.

For example, when the number of available exchanges is reduced as in the case of a failure caused by a widespread disaster such as an earthquake, the number of important subscribers is larger than the number of available rescue time slots. In such a case, if the communication of government offices is interrupted, confusion will be caused.

In order to prevent such confusion, priority may be given to important subscribers, and the communication data of the important subscribers may be relieved in order from the important subscriber having the highest priority. Hereinafter, such an embodiment will be described as a third embodiment.

[0138] In the third embodiment, the subscriber allocating apparatus 130 uses the subscriber data table 2 shown in FIG.
01, the subscriber data table 1 shown in FIG.
701 is stored in the storage device 131.

As shown in FIG. 17, the subscriber data table 1701 has the subscriber data table 2 shown in FIG.
In addition to the stored contents of 01, a priority 1702 is stored.

In the example of FIG. 17, the important subscribers 101 and 10
Priority 1702 corresponding to 4,105, respectively,
“2”, “1”, and “3” are stored. That is,
In the third embodiment, the subscribers 104, 101, 1
It is assumed that the priority is higher in the order of 05.

In the third embodiment, it is necessary to further register the priority when registering that the subscriber is an important subscriber.

This registration is performed by the maintenance person by the maintenance terminal 135.
Alternatively, a command of a predetermined format is input from the remote maintenance terminal 170 to the subscriber distribution device 130,
This is performed by rewriting the subscriber data table 1701 stored in the storage device 131 of the subscriber distribution device 130. Specifically, in the subscriber data table 1701 shown in FIG.
In other words, “YES” is set in the important subscriber flag 306 corresponding to No. 5, and a value indicating the priority is set in the priority 1702 corresponding to the subscribers 101, 104, and 105.

Note that the format of a command to be input by the maintenance person when registering an important subscriber and the priority order is as follows.
For example, as shown in FIG.

In FIG. 18, reference numerals 1801 to 1803 denote important subscriber setting commands. Of these, the important subscriber setting command 1801 is a command to be entered when registering that the user is an important subscriber. The important user setting command 1802 is a command to be input when canceling the important subscriber, and the important subscriber setting 1803 is a command to be input when changing the priority given to the important subscriber.

As shown in FIG. 18, the important subscriber setting command 1801 has, as a first parameter, information indicating registration, and as a second parameter, a subscriber to be registered as an important subscriber. And a value indicating the priority to be assigned as the third parameter.

An important subscriber setting command 1802
Has, as a first parameter, information indicating cancellation, and has, as a second parameter, a telephone number of a subscriber to be canceled as an important subscriber.

An important subscriber setting command 1803
Has, as a first parameter, information indicating that the priority is to be changed, has, as a second parameter, a telephone number of a subscriber whose priority is to be changed, and has, as a third parameter, Has a value indicating the priority order.

Next, when a failure occurs in the exchange 160 or the exchange-facing transmission line 142, the subscriber
Is the subscriber 1 whose exchange 160 accommodates the used line.
The operation of the important subscriber rescue according to the third embodiment will be described by taking as an example a case where the communication data b, d, and e of 02, 104, and 105 cannot be transmitted.

Switch 160 or Switch Opposite Transmission Line 14
If a failure occurs in the second, the exchange-facing transmission line 142 becomes unusable. Therefore, in the subscriber distribution device 130, the communication abnormality monitoring device 134 detects that fact and notifies the control device 132.

The control device 132 is a communication abnormality monitoring device 13
4 informs that the exchange-facing transmission line 142 is unusable, refers to the rescue time slot table 202 stored in the storage device 131, and switches to the exchange-facing transmission line other than the exchange-facing transmission line 142. Select an assigned rescue time slot.

In the rescue time slot table 202 shown in FIG. 2, only the time slot t14 allocated to the exchange-to-exchange transmission line 141 satisfies the condition, so the control device 132 selects the rescue time slot t14. It will be.

Subsequently, the control device 132 sets the in-use flag 208 corresponding to the selected rescue time slot t14 in the rescue time slot table 202 to a value (“YES”) indicating that it is in use. Rewrite.

The operation up to this point is the same as in the first embodiment.

Subsequently, the control device 132
With reference to the subscriber data table 1701 stored in No. 1, an important subscriber to whom communication data is transmitted through the unusable exchange-facing transmission line 142 and which has the highest priority is obtained. .

The subscriber data table 17 shown in FIG.
01, since the important subscriber 104 satisfies the condition,
The controller 132 will seek the important subscriber 104.

Subsequently, the control device 132 uses the path information 204 corresponding to the found important subscriber 104 in the subscriber data table 1701 to indicate that a path is to be established between the time slot t04 and the time slot t20. From the information,
It is rewritten with information indicating that a path is established between the time slot t04 and the time slot t14.

Thus, under the control of the control device 132, the communication path device 133 can control the time slot t05 assigned to the multiplexing device opposite transmission line 122 and the time slot t05 assigned to the switching device opposite transmission line 142.
22 is switched between the time slot t05 assigned to the multiplexing device opposite transmission line 122 and the rescue time slot t14 assigned to the switching device opposite transmission line 141. Because
The communication data d of the important subscriber 104 is stored in a time slot t05,
The important subscriber 1 is placed in the rescue time slot t14 assigned to the exchange-facing transmission path 141.
The used line 04 is temporarily accommodated in the exchange 150.

The exchange 150 exchanges the subscriber information 304 corresponding to the rescue time slot t14 in the subscriber data table 301 shown in FIG. 3 or the subscriber data table 1601 shown in FIG. Is stored in the rescue time slot t.
It is possible to perform an exchange process on the communication data d of the important subscriber 104 carried on 14.

Therefore, even if the exchange-facing transmission line 142 becomes unusable, communication data of the important subscriber 104 can be rescued.

It is to be noted that, regarding the important subscriber 105 having the next highest priority after the important subscriber 104, in the example described above, the exchange-to-exchange transmission line 1 other than the exchange-to-exchange transmission line 142 is used.
Since there is only one rescue time slot t14 assigned to the rescue time slot t14,
When the subscriber 104 is rescued, there is no available rescue time slot because the rescue time slot is no longer available. However, the control device 132 determines whether there is no more important subscriber to be rescued, or the available rescue time. The above operation is performed until no slots remain.

The flowchart of the important subscriber rescue operation described above is as shown in FIG.

As described above, according to the third embodiment, it is possible to rescue the communication data of the important subscriber in order from the important subscriber having the highest priority. Like a widespread disaster,
When the number of important subscribers becomes larger than the number of available rescue time slots, such as when the number of available exchanges decreases, by increasing the priority of government agencies, etc., The disruption due to the interruption of communication is not caused.

Next, a switching network according to a fourth embodiment of the present invention will be described.

The block diagram showing the configuration of the switching network of the fourth embodiment is the same as that of FIG.

That is, in the fourth embodiment, similarly to the first embodiment, the exchange-facing transmission line 14
One time slot t14 and a time slot t24 of the exchange-facing transmission line 142 are allocated as rescue time slots.

A feature of the fourth embodiment is that, in the case where a failure has occurred in an exchange-facing transmission line and the exchange itself can operate, communication data is transmitted due to the failure of the exchange-facing transmission line. The exchange which relieves the communication data of the important subscriber who has become unable to do so, and temporarily accommodates the line used by the important subscriber, changes the incoming call to the important subscriber to the important subscriber. The incoming call is forwarded to a telephone number uniquely specified in the rescue time slot in which the communication data is placed.

However, in order to enable this incoming call transfer, it is necessary to associate a rescue time slot for carrying communication data at the time of rescue for each important subscriber.

Therefore, in the fourth embodiment, the subscriber allocating apparatus 130 includes the subscriber data table 201 and the rescue time slot table 20 shown in FIG.
2 instead of the subscriber data table 901 shown in FIG.
Is stored in the storage device 131.

As shown in FIG. 9, the subscriber data table 901 contains subscriber identification information 9 for identifying a subscriber.
02, path information 903 necessary for realizing the distribution of the subscriber, and transmission path identification information for identifying an exchange-facing transmission path to which a time slot in which communication data of the subscriber is placed is assigned. 904 and an important subscriber flag 90 indicating whether the subscriber is an important subscriber or not.
5, when the subscriber is an important subscriber, time slot identification information 906 for identifying a rescue time slot for carrying communication data of the important subscriber, and a telephone number 907 of the subscriber. When the subscriber is an important subscriber, a telephone number 90 uniquely specified in a rescue time slot for carrying communication data of the important subscriber.
8 are stored.

In the example of FIG. 9, the value ("YES") indicating that the subscriber is an important subscriber is stored in the important subscriber flag 905 corresponding to the subscribers 101 and 104. That is,
In the fourth embodiment, it is assumed that the subscribers 101 and 104 are important subscribers.

In the example shown in FIG. 9, the important subscribers 101,
Information indicating the time slots t24 and t14 for rescue is stored in the time slot identification information 906 corresponding to 104, respectively. That is, in the fourth embodiment, the important subscriber 101 is associated with the rescue time slot t24, and the important subscriber 104 is associated with the rescue time slot t14.

In the example of FIG. 9, the telephone numbers 907 and 9
08 is stored. As described later, the maintenance terminal 1 stores a list in which telephone numbers before rescue and telephone numbers to which calls are transferred during rescue are associated.
35 or a terminal for remote maintenance 170 so as to enable output.

In the fourth embodiment, exchanges 150 and 160 store subscriber data tables 1001 and 1002 shown in FIG. 10 instead of subscriber data tables 301 and 302 shown in FIG. 151, 16
1 is stored.

As shown in FIG. 10, in the subscriber data table 1001, each time slot identification information 1003 for identifying a time slot assigned to the exchange-facing transmission line 141 is added to the time slot. Subscriber information 1004, which is information necessary for performing an exchange process on the communication data of the incoming subscriber; a telephone number 1005 uniquely defined for the time slot;
Important subscriber flag 1006 indicating whether or not the subscriber to whom communication data is to be placed in the time slot is an important subscriber.
And a telephone number 1007 uniquely specified for a rescue time slot for carrying communication data of the important subscriber when the subscriber to whom the communication data is carried in the time slot is an important subscriber. Have been.

Similarly, the subscriber data table 1002
Is time slot identification information 1 for identifying a time slot assigned to the exchange-facing transmission line 142.
For each 003, subscriber information 1004 which is information necessary for performing exchange processing on the communication data of the subscriber carried in the time slot, a telephone number 1005 uniquely defined for the time slot, An important subscriber flag 1006 indicating whether or not a subscriber to whom communication data is to be loaded in the time slot is an important subscriber, and an important subscriber flag 1006 when the subscriber to which communication data is to be loaded in the time slot is an important subscriber. A telephone number 1007 which is uniquely defined in a rescue time slot for carrying communication data of an important subscriber is stored.

As described above, in the fourth embodiment, it is assumed that the subscribers 101 and 104 are important subscribers, and the important subscriber 101 is associated with the rescue time slot t24. Since the subscriber 104 is associated with the rescue time slot t14, as shown in FIG. 10, the rescue time slot t14 corresponds to the time slot t10 in the subscriber data table 1001 in which the communication data of the subscriber 101 is placed. In the important subscriber flag 1006, a value (“YE
S ") is stored in the subscriber data table 100.
The telephone number 1007 corresponding to the time slot t10 in which the communication data of the subscriber 101 is placed in 1 stores a telephone number uniquely defined in the rescue time slot t24. Also, as shown in FIG. 10, a value indicating that the user is an important subscriber ("" in the important subscriber flag 1006 corresponding to the time slot t20 in which the communication data of the subscriber 104 is placed in the subscriber data table 1002. YES ") is stored, and the telephone number 1007 corresponding to the time slot t20 in which the communication data of the subscriber 104 is placed in the subscriber data table 1002.
Stores a telephone number uniquely determined for the rescue time slot t14.

As described later, in the fourth embodiment, since the important subscriber to whom communication data can be placed in the rescue time slot is determined,
Unlike the embodiment, the subscriber information 1004 corresponding to the rescue time slot stores the same contents as the subscriber information of the important subscriber in which communication data is loaded in the rescue time slot.

Next, an operation of rescuing an important subscriber in the fourth embodiment will be described.

Prior to the description, the operation of registering various information will be described.

In order for the subscribers 101 and 104 to be important subscribers, it is necessary to first register these subscribers 101 and 104 as important subscribers.

This registration is performed by the maintenance person by the maintenance terminal 135.
Alternatively, a command of a predetermined format is input from the remote maintenance terminal 170 to the subscriber distribution device 130,
This is performed by rewriting the subscriber data table 901 stored in the storage device 131 of the subscriber distribution device 130. Specifically, in the subscriber data table 901 shown in FIG. 9, "YES" is set in the important subscriber flag 905 corresponding to the subscribers 101 and 104, and the subscriber 1 is set.
Time slot identification information 906 corresponding to 01 and 104
Is set to indicate the time slots t24 and t14 for rescue, and the telephone numbers 90 corresponding to the subscribers 101 and 104 are set.
8 is to set a telephone number uniquely determined for the rescue time slots t24 and t14.

Note that the format of a command to be entered by the maintenance person when registering an important subscriber is, for example, as shown in FIG.
As shown in FIG.

In FIG. 11, reference numerals 1101 to 1103 denote important subscriber setting commands. Among them, the important subscriber setting command 1101 is a command to be input when registering that the subscriber is an important subscriber. The user setting command 1102 is a command to be input when canceling the fact that the user is an important subscriber. The important subscriber setting 1103 is a telephone number that is uniquely defined in the rescue time slot. This is the telephone number of the person.)
This is a command to be input when changing.

As shown in FIG. 11, the important subscriber setting command 1101 has, as a first parameter, information indicating registration, and as a second parameter, a subscriber who should register that it is an important subscriber. And the third parameter is the telephone number of the call transfer destination.

An important subscriber setting command 1102
Has, as a first parameter, information indicating cancellation, and has, as a second parameter, a telephone number of a subscriber to be canceled as an important subscriber.

Also, the important subscriber setting command 1103
Has, as a first parameter, information indicating that the telephone number of the call transfer destination is to be changed, and has, as the second parameter, a telephone number of an important subscriber whose telephone number of the call transfer destination is to be changed, The three parameters include a telephone number that is the telephone number of the call transfer destination after the change.

At this time, the maintenance person further inputs a command of a predetermined format to the exchanges 150 and 160 from the maintenance terminals 155 and 165 or the remote maintenance terminal 170, and , 160, the subscriber data tables 1001 and 1002 stored in the storage devices 151 and 161 need to be rewritten. Specifically, the subscriber data table 1001 shown in FIG.
, The important subscriber flag 1006 corresponding to the time slot t10 in which the communication data of the subscriber 101 is placed
, A value indicating that the subscriber is an important subscriber (“YES”) is set, and a telephone number 1007 corresponding to the time slot t10 in which the communication data of the subscriber 101 is placed is uniquely set to the rescue time slot t24. In the subscriber data table 1002 shown in FIG. 10, the important subscriber flag 1006 corresponding to the time slot t20 in which the communication data of the subscriber 104 is loaded is set in the subscriber data table 1002 shown in FIG. In addition to setting a value (“YES”) indicating that there is, the telephone number 1007 corresponding to the time slot t20 in which the communication data of the subscriber 104 is placed is replaced with a telephone number uniquely defined in the rescue time slot t14. It is to set.

Note that the subscriber data table 1001,1
Since the format of the command input by the maintenance person when rewriting 002 is easily guessed from the command format shown in FIG. 11, the description is omitted.

The registration operation described above is particularly
When the operation is performed from the remote maintenance terminal 170, the operation can be performed collectively.

In the state where various information is registered as described above, for example, a failure occurs in the exchange-facing transmission line 141, and the subscriber distribution device 130 causes the subscriber 150 whose exchange 150 101, 103, 10
The operation of the important subscriber rescue according to the fourth embodiment will be described by taking as an example the case where the communication data a, c, and f cannot be transmitted.

When a failure occurs in the exchange-facing transmission line 141, the exchange-facing transmission line 141 becomes unusable.
In the subscriber distribution device 130, the communication abnormality monitoring device 134 detects that fact and notifies the control device 132.

The control device 132 is a communication abnormality monitoring device 13
4 is notified that the exchange-facing transmission path 141 is unusable, the important subscriber flag 905 in the subscriber data table 901 stored in the storage device 131 is searched for an important subscriber.

The subscriber data table 901 shown in FIG.
Then, since the important subscribers 101 and 104 satisfy the condition, the control device 132 finds one of the important subscribers 101 and 104. Here, the control device 1
32 will continue the description as if the important subscriber 101 was found.

Subsequently, the control device 132
1 with reference to the transmission line identification information 904 in the subscriber data table 901 stored in the important subscriber 1
It is determined whether it is necessary to rescue the 01 communication data a.

Here, since the exchange-facing transmission line 141 to which the time slot t10 in which the communication data a of the important subscriber 101 is to be assigned is the disabled exchange-facing transmission line, the control device 132 , It is determined that the communication data a of the important subscriber 101 needs to be rescued.

Subsequently, the control device 132 transmits the important subscriber 1
From the time slot identification information 906 corresponding to 01, a rescue time slot associated with the important subscriber 101 is obtained.

The subscriber data table 901 shown in FIG.
Since the information indicating the rescue time slot t24 is set in the time slot identification information 906 corresponding to the important subscriber 101, the control device 132 determines the rescue time slot t24.

Subsequently, control device 132 converts path information 904 corresponding to important subscriber 101 in subscriber data table 901 from information indicating that a path is established between time slot t01 and time slot t10. , The information indicating that a path is established between the time slot t01 and the time slot t24.

Thus, under the control of the control device 132, the communication path device 133 controls the time slot t01 assigned to the multiplexing device opposite transmission line 121 and the time slot t01 assigned to the switching device opposite transmission line 141.
10 is replaced between the time slot t01 assigned to the multiplexing device opposite transmission line 121 and the rescue time slot t24 assigned to the switching device opposite transmission line 142. Because
The communication data a of the important subscriber 101 includes a time slot t01 assigned to the multiplex apparatus opposite transmission path 121,
The important subscriber 1 is placed in the rescue time slot t24 assigned to the exchange-facing transmission line 142.
The use line 01 is temporarily accommodated in the exchange 160.

The exchange 160 sets the rescue time slot t2 in the subscriber data table 1002 shown in FIG.
4 is included in the subscriber information 1004 corresponding to the important subscriber 101.
Since the same contents as the subscriber information of the important subscriber 101 stored in the rescue time slot t24 can be exchanged.

Therefore, even if the exchange-facing transmission line 141 becomes unusable, the communication data of the important subscriber 101 can be rescued.

[0202] Regarding another important subscriber 104, in the above-described example, the exchange-facing transmission line 142 to which the time slot t20 in which the communication data d of the important subscriber 104 is placed is available. Yes,
It is not necessary to rescue the communication data d of the important subscriber 104, but the control device 132 performs the above operation until there is no more important subscriber to be rescued.

Next, an explanation will be given of the call transfer operation in the fourth embodiment when the exchange 160 temporarily accommodates the line used by the important subscriber 101 as described above.

Even if the line used by the important subscriber 101 is temporarily accommodated in the exchange 160, the incoming call to the important subscriber 101 is transmitted to the important subscriber 101 by the originating subscriber.
Since the user does not know the telephone number after the change of "01", the exchange 150
To reach.

In the fourth embodiment, the exchange 150
Since the switch itself can operate, in the exchange 150, the control device 152 recognizes from the communication abnormality monitoring device 154 that the exchange-facing transmission line 141 is unusable.

Then, the control device 152 controls the important subscriber 1
When the call arrives at 01, the exchange-facing transmission path 141 to which the time slot t10 in which the communication data a of the important subscriber 101 is placed cannot be used. Data table 100
1 and refer to the telephone number 1007 in the
The call is forwarded to the transfer destination 7.

In this example, the transferred incoming call arrives at exchange 160, and exchange processing is performed by exchange 160, so that a call can be made between important subscriber 101 and the originating subscriber. .

A flowchart of the above-described incoming call transfer operation is as shown in FIG. Further, as a result of performing the important subscriber rescue operation and the call transfer operation described above, the destination of the communication data a of the important subscriber 101 in the switching network shown in FIG. 1 is changed as shown in FIG. .

As described above, according to the fourth embodiment, the location where a failure has occurred is the exchange-facing transmission line,
When the exchange itself can operate, the communication data of the important subscriber carries an incoming call to the important subscriber whose communication data can no longer be transmitted due to a failure in the transmission line facing the exchange. The call can be forwarded to the telephone number specified for the rescue time slot specified, so that subscribers who call important subscribers who are rescuing need not be aware of the changed telephone number. Will be completed.

[0210] In the fourth embodiment, for example, for all important subscribers, the subscriber allocating apparatus 130 transmits the normal telephone number 907 of the important subscriber and the communication of the important subscriber. Telephone number 908 uniquely specified for a rescue time slot for carrying data
Can be output to the maintenance terminal 135 or transmitted to the remote maintenance terminal 170 via the maintenance network 171.

Here, the output contents of the list can be the contents shown in FIG.

In this way, the maintenance person can know the telephone number of the important subscriber and the telephone number to which the important subscriber is to be transferred.

[0213] Further, the subscriber distributing apparatus 130 transmits a notification indicating that the important subscriber has been rescued to the remote maintenance terminal 170 via the maintenance network 171. Is received, the storage device 1 of the subscriber distribution device 130 via the maintenance network 171.
The subscriber data table 901 stored in the storage device 31 is referred to, or when an instruction is given from a maintenance person, the subscription data stored in the storage device 131 of the subscriber distribution device 130 via the maintenance network 171. The user data table 901 may be referred to.

In the fourth embodiment, an incoming call to an important subscriber being rescued is forwarded by an exchange in which a line used by the important subscriber is temporarily accommodated. Reference numerals 150 and 160 denote, for example, the exchange-facing transmission line 14 between itself and the subscriber sorting device 130.
In the event that a failure occurs in 1,142, for each of the important subscribers accommodating the line in use, the normal telephone number 1005 of the important subscriber and the incoming call to the important subscriber A list in which the telephone numbers 1007 to which the call is transferred can be output to the maintenance terminals 155 and 165 or transmitted to the remote maintenance terminal 170 via the maintenance network 171.

In this manner, the maintenance person can rescue the telephone number of the important subscriber whose communication line is accommodated in the exchange in which the failure has occurred in the exchange-compatible transmission line, and the communication data of the important subscriber. Thus, the changed telephone number can be known, so that it is possible to know which telephone number is being forwarded to which telephone number.

Further, the exchanges 150 and 160 transmit a notification indicating that the incoming call to the important subscriber has been transferred to the remote maintenance terminal 170 via the maintenance network 171. However, upon receiving this notification, the user refers to the subscriber data tables 1001 and 1002 stored in the storage devices 151 and 161 of the exchanges 150 and 160 via the maintenance network 171 or receives an instruction from the maintenance person. May be referred to the subscriber data tables 1001 and 1002 stored in the storage devices 151 and 161 of the exchanges 150 and 160 via the maintenance network 171.

[0219]

As described above, according to the switching network of the present invention, unlike the conventional switching network, automatic switching can be performed without providing a spare switch and without requiring instructions from a maintenance person. Thus, the communication data of the important subscriber can be rescued.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a switching network according to a first embodiment.

FIG. 2 is an explanatory diagram showing an image of data stored in a storage device of the subscriber distribution device according to the first embodiment.

FIG. 3 is an explanatory diagram showing an image of data stored in a storage device of the exchange according to the first embodiment.

FIG. 4 is an explanatory diagram showing a format of a command input by a maintenance person in the first embodiment.

FIG. 5 is a flowchart of an important subscriber rescue operation in the first embodiment.

FIG. 6 is a sequence diagram of a telephone number notification operation according to the second embodiment.

FIG. 7 is another sequence diagram of a telephone number notification operation according to the second embodiment.

FIG. 8 is an explanatory diagram showing a state of an exchange network as a result of performing an important subscriber rescue operation in the first embodiment.

FIG. 9 is an explanatory diagram showing an image of data stored in a storage device of the subscriber sorting device according to the fourth embodiment.

FIG. 10 is an explanatory diagram showing an image of data stored in a storage device of an exchange according to a fourth embodiment.

FIG. 11 is an explanatory diagram showing a format of a command input by a maintenance person in the fourth embodiment.

FIG. 12 is an explanatory diagram showing an example of output contents of a maintenance terminal or a remote maintenance terminal of the subscriber sorting device according to the fourth embodiment.

FIG. 13 is a flowchart of an incoming call transfer operation in the fourth embodiment.

FIG. 14 is an explanatory diagram showing a state of an exchange network as a result of performing an important subscriber rescue operation and a call transfer operation in the fourth embodiment.

FIG. 15 is an explanatory diagram showing an example of output contents of the remote maintenance terminal according to the first embodiment.

FIG. 16 is an explanatory diagram showing an image of data stored in a storage device of the exchange according to the second embodiment.

FIG. 17 is an explanatory diagram showing an image of data stored in a storage device of the subscriber distribution device according to the third embodiment.

FIG. 18 is an explanatory diagram showing a format of a command input by a maintenance person when registering an important subscriber in the third embodiment.

FIG. 19 is a flowchart of an important subscriber rescue operation according to the third embodiment.

[Explanation of symbols]

101: subscriber, 102: subscriber, 103: subscriber, 1
04 ... subscriber, 105 ... subscriber, 106 ... subscriber, 11
DESCRIPTION OF SYMBOLS 1 ... Multiplexing device, 112 ... Multiplexing device, 121 ... Multiplexing device opposite transmission line, 122 ... Multiplexing device opposite transmission line, 130 ... Subscriber distribution device, 131 ... Storage device, 132 ... Control device, 133 ... Communication line device, 134 … Communication error monitoring device
135 ... maintenance terminal, 141 ... exchange transmission line, 14
Reference numeral 2 denotes an exchange-facing transmission line, 150 denotes an exchange, 151 denotes a storage device, 152 denotes a control device, 153 denotes a communication path device, and 154.
... communication abnormality monitoring device, 155 ... maintenance terminal, 160 ... exchanger, 161 ... storage device, 162 ... control device, 163 ...
Communication path device, 164: communication abnormality monitoring device, 165: maintenance terminal, 170: remote maintenance terminal, 171: maintenance network, 2
01 ... subscriber data table, 202 ... rescue time slot table, 203 ... subscriber identification information, 204 ... path information, 205 ... transmission line identification information, 206 ... important subscriber flag, 207 ... time slot identification information, 208 ... Busy flag, 301 ... subscriber data table, 302 ...
Subscriber data table, 303: time slot identification information, 304: subscriber information, 305: telephone number, 306:
Rescue flag, 401 ... important subscriber setting command, 40
2 ... important subscriber setting command, 901 ... subscriber data table, 902 ... subscriber identification information, 903 ... path information,
904: transmission line identification information, 905: important subscriber flag,
906: time slot identification information, 907: telephone number,
908: telephone number, 1001: subscriber data table,
1002 subscriber data table, 1003 time slot identification information, 1004 subscriber information, 1005 telephone number, 1006 important subscriber flag, 1007 telephone number, 1101 important subscriber setting command, 1102 ...
Important subscriber setting command, 1103 ... Important subscriber setting command, 1601 ... Subscriber data table, 1602 ...
Subscriber data table, 1603... Telephone number notification skip flag, 1701.
... priority, 1801 ... important subscriber setting command, 18
02 ... important subscriber setting command, 1803 ... important subscriber setting command.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Funayama 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.Information and Communication Division (72) Inventor Masanori Okuyama 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Within the Information & Communication Business Department, Hitachi, Ltd. (72) Inventor Yasuo Otsubo 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Makoto Iwamoto 3-19, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 Nippon Telegraph and Telephone Corporation (72) Inventor Chihiro Sato 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Akira Tokutake 3-19 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 Nippon Telegraph and Telephone Corporation

Claims (13)

[Claims] 1. A plurality of multiplexing devices for connecting a plurality of subscribers and time-division multiplexing the communication data of these subscribers, and accommodating communication lines of the plurality of subscribers, the communication data of these subscribers being accommodated. A plurality of exchanges that perform switching processing, and are installed between the plurality of multiplexing devices and the plurality of exchanges, and transmit communication data respectively transmitted from the plurality of multiplexing devices to a line used by a corresponding subscriber. A switching network for transmitting communication data transmitted from each of the plurality of exchanges to a multiplexing device connected to a corresponding subscriber while transmitting the communication data to the exchanges accommodated therein; In addition to the time slot in which the communication data is normally carried, a predetermined specific subscriber is provided on the exchange-facing transmission path, which is a transmission path between each of the exchanges and the above-mentioned subscriber sorting device. One or more rescue time slots, in which communication data of the important subscriber is placed at the time of failure, are always assigned, and the subscriber sorting device stores the information indicating the important subscriber. Storage means; rescue time slot storage means for storing information indicating rescue time slots assigned to each of the plurality of exchange-facing transmission paths; and the plurality of exchanges and the plurality of exchange-facing transmission paths If a failure occurs in any of the subscribers, the storage contents of the important subscriber storage means are selected from the subscribers whose lines are accommodated in the exchange in which communication data cannot be transmitted due to the failure. On the basis of the above, an important subscriber is sought, and an exchange other than the exchange opposite the transmission line that cannot transmit communication data due to the failure. From the transmission path, one of the rescue time slots is selected based on the storage contents of the rescue time slot storage means, and the important important subscriber's communication data is loaded onto the selected rescue time slot. The plurality of exchanges have a subscriber rescue means, and the plurality of exchanges are also capable of transmitting communication data of important subscribers placed in a rescue time slot allocated to an exchange-facing transmission line between the exchange and itself. And a switching network. 2. The exchange network according to claim 1, wherein said plurality of exchanges include information indicating a rescue time slot assigned to an exchange-facing transmission path between the plurality of exchanges and the subscriber sorting device; And a rescue storing information necessary for performing an exchange process on communication data of an important subscriber placed in the rescue time slot, including at least a telephone number uniquely defined in the rescue time slot. Information storage means, and communication data carried in a rescue time slot assigned to the exchange-facing transmission line between itself and the above-mentioned subscriber sorting device, wherein communication data representing the first transmission from an important subscriber In this case, the important subscriber is notified of the telephone number uniquely specified in the rescue time slot, and thereafter, the rescue time is notified. When the communication data which have been put on lot, a communication data representing a predetermined specific content was from heavy main subscriber,
Telephone number notifying means for stopping the notification of the telephone number to the important subscriber; and the communication data of the important subscriber after the telephone number notifying means stops the notification of the telephone number to the important subscriber. A switching network for performing a switching process for 3. The switching network according to claim 2, wherein said telephone number notifying means transmits said important subscriber's communication data when said important subscriber's communication data is being exchanged. If the important subscriber is communication data representing predetermined specific content, notification of the telephone number to the important subscriber is resumed, and thereafter, the communication data of the important subscriber is transmitted to the important subscriber. A communication network which stops notification of the telephone number to the important subscriber when the communication data represents predetermined specific content from the communication network. 4. The switching network according to claim 2, wherein said telephone number notifying means transmits said important subscriber's communication data when said important subscriber's communication data is being exchanged. If the communication data represents predetermined specific content from the important subscriber, the notification of the telephone number to the important subscriber is restarted, and the destination subscriber of the important subscriber is also notified of the telephone number. Providing a notification, and then, if the communication data of the important subscriber is communication data representing predetermined specific content from the important subscriber, a telephone number to the important subscriber and the destination subscriber. A switching network for stopping the notification of a message. 5. The exchange network according to claim 2, wherein said plurality of exchanges include: a receiving means for receiving a designation to change a storage content of said rescue information storage means; A switching unit for changing the storage content of the rescue information storage unit in accordance with the received specified content. 6. The switching network according to claim 1, wherein said subscriber allocating device comprises: information indicating an important subscriber determined by said important subscriber rescue means; An exchange network, further comprising output means for outputting information indicating a rescue time slot selected by the important subscriber rescue means to the outside in association with the information. 7. The switching network according to claim 1, wherein said subscriber allocating device is one of said important subscriber storage means and said rescue time slot storage means. Receiving means for receiving a designation to change any of the storage contents; and storing the designated storage of the important subscriber storage means and the rescue time slot storage means in accordance with the specification contents received by the receiving means. A switching network, further comprising changing means for changing contents. 8. The switching network according to claim 1, wherein said important subscriber storage means further stores a priority assigned to each important subscriber in advance. The important subscriber rescue means, in order from the high priority important subscriber stored in the important subscriber storage means, the communication data of the important subscriber,
An exchange network characterized by being mounted on a selected rescue time slot. 9. The switching network according to claim 1, wherein said subscriber sorting device is a switching network, wherein said important subscriber storage means stores important information indicated by information stored in said important subscriber storage means. Rescue destination storage means for storing information for associating a subscriber with a rescue time slot indicated by the information stored in the rescue time slot storage means, wherein the important subscriber rescue means comprises: According to the information stored in the rescue destination storage means, a rescue time slot associated with the determined important subscriber is selected, and the plurality of exchanges are provided with information on the important subscriber accommodating the used line. A telephone number uniquely defined in a time slot in which communication data is to be loaded at normal times, and a telephone number uniquely defined in a rescue time slot used when rescuing communication data of the important subscriber. The number of the rescue destination telephone number stored in association with each other, and in the event that a failure has occurred in the exchange-facing transmission path between itself and the above-mentioned subscriber sorting device, the own line is used to accommodate the used line. If there is an incoming call to an important subscriber, the rescue time slot used at the time of rescue of the communication data of the important subscriber is uniquely determined based on the storage contents of the rescue destination telephone number storage means. An exchange network, further comprising a call transfer means for transferring a call to a telephone number. 10. The exchange network according to claim 9, wherein said plurality of exchanges have a rescue telephone number when a failure occurs in an exchange-facing transmission path between themselves and said subscriber sorting device. An exchange network, further comprising output means for outputting the contents stored in the storage means to the outside. 11. The switching network according to claim 9 or 10, wherein said subscriber sorting device accepts a designation for changing a storage content of said rescue destination storage means, and accepts said designation by said accepting means. Changing means for changing the storage contents of the rescue destination storage means in accordance with the specified contents. 12. The exchange network according to claim 9, 10 or 11, wherein said plurality of exchanges receive an instruction to change a storage content of said relief destination telephone number storage means, and said reception means. A changing means for changing the storage contents of the rescue destination telephone number means in accordance with the specified contents received by the means. 13. A plurality of multiplexing apparatuses for connecting a plurality of subscribers and time-division multiplexing the communication data of these subscribers, and accommodating communication lines used by the plurality of subscribers. The communication data transmitted from each of the plurality of multiplexing devices is connected to a plurality of exchanges that perform switching processing on the plurality of multiplexing devices. A subscriber allocating device for transmitting communication data transmitted from each of the exchanges to a multiplexing device to which a corresponding subscriber is connected, wherein the transmission line is a transmission line between each of the plurality of exchanges. One or more rescue time slots in which communication data of an important subscriber, which is a predetermined specific subscriber, is carried in the event of a failure, separately from time slots in which communication data is usually carried. In a subscriber sorting device used in a switching network which is always assigned, important subscriber storage means for storing information indicating an important subscriber, and assigned to each of the plurality of exchange-facing transmission paths. Rescue time slot storage means for storing information indicating a rescue time slot; and, when a failure occurs in any of the plurality of exchanges and the plurality of exchange-facing transmission paths, communication data due to the failure. Of the subscribers whose use lines are accommodated in the exchange in which the transmission of the communication line cannot be performed, the important subscriber is determined based on the stored contents of the important subscriber storage means, and the communication data is transmitted due to the failure. Out of the exchange-facing transmission paths other than the exchange-facing transmission path that can no longer be stored in the rescue time slot storage means. A subscriber rescue means for selecting one of the rescue time slots based on the contents and placing the determined important subscriber communication data in the selected rescue time slot. apparatus.